RISK FACTORS

You should carefully consider the following risk factors and all other information contained in this prospectus, including “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our audited combined and consolidated financial statements and the related notes, before investing in our ordinary shares. If any of the following risks materialize, our business, results of operations and financial condition could be materially and adversely affected. In that case, the trading price of our ordinary shares could decline, and you may lose some or all of your investment.

This prospectus contains forward-looking statements that involve risks and uncertainties. See “Important Information and Cautionary Statement Regarding Forward-Looking Statements.” Our actual results could differ materially and adversely from those anticipated in these forward-looking statements.

Risks Related to Our Business

If we fail to implement our business strategy, including our productivity and cost reduction initiatives, our financial condition and results of operations could be materially adversely affected.

Our future financial performance and success depend in large part on our ability to successfully implement our business strategy, including investing in high-return opportunities in our core markets, focusing on higher-margin, technologically advanced products, differentiating our products, expanding our strategic relationships with customers in selected international regions, fixed-cost containment and cash management, and executing on our Lean manufacturing program. We cannot assure you that we will be able to successfully implement our business strategy or be able to continue improving our operating results. Implementation of our business strategy could be affected by a number of factors beyond our control, such as increased competition, legal and regulatory developments, general economic conditions or an increase in operating costs. Any failure to successfully implement our business strategy could adversely affect our financial condition and results of operations. In addition, we may decide to alter or discontinue certain aspects of our business strategy at any time. Although we have undertaken and expect to continue to undertake productivity and cost reduction initiatives to improve performance, such as the Lean manufacturing program, we cannot assure you that all of these initiatives will be completed or that any estimated cost savings from such activities will be fully realized. Even when we are able to generate new efficiencies in the short- to medium-term, we may not be able to continue to reduce cost and increase productivity over the long term.

The cyclical and seasonal nature of the metals industry, our end-use markets and our customers’ industries, in particular our aerospace, automotive, heavy duty truck and trailer industries, could negatively affect our financial condition and results of operations.

The metals industry is generally cyclical in nature, and these cyclical fluctuations tend to directly correlate with changes in general and local economic conditions. These conditions include the level of economic growth, financing availability, the availability of affordable energy sources, employment levels, interest rates, consumer confidence and housing demand. Historically, in periods of recession or periods of minimal economic growth, metals companies have often tended to underperform other sectors. In addition, economic downturns in regional and global economies, including in Europe, or a prolonged recession in our principal industry segments, have had a negative impact on our operations in the past and could have a negative impact on our future financial condition or results of operations. Although we continue to seek to diversify our business on a geographic basis, we cannot assure you that diversification would mitigate the effect of cyclical downturns.

We are particularly sensitive to cycles in the aerospace, defense, automotive, other transportation, building and construction and general engineering end-markets, which are highly cyclical. During recessions or periods of low growth, these industries typically experience major cutbacks in production, resulting in decreased demand for aluminum products. This leads to significant fluctuations in demand and pricing for our products and

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services. Because our operations are capital intensive and we generally have high fixed costs and may not be able to reduce costs and production capacity on a sufficiently rapid basis, our near-term profitability may be significantly affected by decreased processing volumes. Accordingly, reduced demand and pricing pressures may significantly reduce our profitability and materially adversely affect our financial condition, results of operations and cash flows.

In particular, we derive a significant portion of our revenues from products sold to the aerospace industry, which is highly cyclical and tends to decline in response to overall declines in the general economy. The commercial aerospace industry is historically driven by the demand from commercial airlines for new aircraft. Demand for commercial aircraft is influenced by airline industry profitability, trends in airline passenger traffic, the state of the U.S. and global economies and numerous other factors, including the effects of terrorism. In recent years, a number of major airlines have undergone chapter 11 bankruptcy or comparable insolvency proceedings and experienced financial strain from volatile fuel prices. The aerospace industry also suffered significantly in the wake of the events of September 11, 2001, resulting in a sharp decrease globally in new commercial aircraft deliveries and order cancellations or deferrals by the major airlines. Despite existing backlogs, continued financial uncertainty in the industry, inadequate liquidity of certain airline companies, production issues and delays in the launch of new aircraft programs at major aircraft manufacturers, stock variations in the supply chain, terrorist acts or the increased threat of terrorism may lead to reduced demand for new aircraft that utilize our products, which could materially adversely affect our financial position, results of operations and cash flows.

Further, the demand for our automotive extrusions and rolled products and many of our general engineering and other industrial products is dependent on the production of cars, light trucks, and heavy duty vehicles and trailers. The automotive industry is highly cyclical, as new vehicle demand is dependent on consumer spending and is tied closely to the strength of the overall economy. We note that the demand for luxury vehicles in China has become significant over the past several years and therefore fluctuations in the Chinese economy may adversely affect the demand for our products. Production cuts by manufacturers may adversely affect the demand for our products. Many automotive related manufacturers and first tier suppliers are burdened with substantial structural costs, including pension, healthcare and labor costs that have resulted in severe financial difficulty, including bankruptcy, for several of them. A worsening of these companies’ financial condition or their bankruptcy could have further serious effects on the conditions of the markets, which directly affects the demand for our products. In addition, the loss of business with respect to, or a lack of commercial success of, one or more particular vehicle models for which we are a significant supplier could have a materially adverse impact on our financial position, results of operations and cash flows.

Customer demand in the aluminum industry is also affected by holiday seasons, weather conditions, economic and other factors beyond our control. Our volumes are impacted by the timing of the holiday seasons in particular, with August and December typically being the lowest months and January to June being the strongest months. Our business is also impacted by seasonal slowdowns and upturns in certain of our customers’ industries. Historically, the can industry is strongest in the spring and summer season, whereas the automotive and construction sectors encounter slowdowns in both the third and fourth quarters of the calendar year. Therefore, our quarterly financial results could fluctuate as a result of climatic or other seasonal changes, and a prolonged period of unusually cool summers in different regions in which we conduct our business could have a negative effect on our financial results and cash flows.

We are subject to unplanned business interruptions that may materially adversely affect our business.

Our operations may be materially adversely affected by unplanned events such as explosions, fires, war or terrorism, inclement weather, accidents, equipment, IT systems and process failures, electrical blackouts, transportation interruptions and supply interruptions. Operational interruptions at one or more of our production facilities could cause substantial losses in our production capacity or increase our operating costs. In addition, replacement of assets damaged by such events could be difficult or expensive, and to the extent these losses are

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not covered by insurance or our insurance policies have significant deductibles, our financial position, results of operations and cash flows may be materially adversely affected by such events. For example, in 2008, a stretcher at Constellium’s Ravenswood facility was damaged due to a defect in its hydraulic system, causing a substantial outage at that facility that had a material impact on our production volumes at this facility and on our financial results for the affected period.

Furthermore, because customers may be dependent on planned deliveries from us, customers that have to reschedule their own production due to our delivery delays may be able to pursue financial claims against us, and we may incur costs to correct such problems in addition to any liability resulting from such claims. Interruptions may also harm our reputation among actual and potential customers, potentially resulting in a loss of business.

Our business involves significant activity in Europe, and adverse conditions and disruptions in European economies could have a material adverse effect on our operations or financial performance.

A material portion of our sales are generated by customers located in Europe. The financial markets remain concerned about the ability of certain European countries, particularly Greece, Ireland and Portugal, but also others such as Spain and Italy, to finance their deficits and service growing debt burdens amidst difficult economic conditions. This loss of confidence has led to rescue measures for Spain, Greece, Portugal and Ireland by euro-zone countries and the International Monetary Fund. Despite these measures, concerns persist regarding the debt burden of certain Eurozone countries and their ability to meet future financial obligations, the overall stability of the euro and the suitability of the euro as a single currency given the diverse economic and political circumstances in individual Eurozone countries. In addition, the actions required to be taken by those countries as a condition to rescue packages, and by other countries to mitigate similar developments in their economies, have resulted in increased political discord within and among Eurozone countries. The interdependencies among European economies and financial institutions have also exacerbated concern regarding the stability of European financial markets generally. These concerns could lead to the re-introduction of individual currencies in one or more Eurozone countries, or, in more extreme circumstances, the possible dissolution of the euro currency entirely. Should the euro dissolve entirely, the legal and contractual consequences for holders of euro-denominated obligations would be determined by laws in effect at such time. These potential developments, or market perceptions concerning these and related issues, could materially adversely affect the value of the Company’s euro-denominated assets and obligations. In addition, concerns over the effect of this financial crisis on financial institutions in Europe and globally could have a material adverse impact on the capital markets generally. Persistent disruptions in the European financial markets, the overall stability of the euro and the suitability of the euro as a single currency or the failure of a significant European financial institution, could have a material adverse impact on our operations or financial performance.

In addition, there can be no assurance that the actions we have taken or may take in response to the economic conditions may be sufficient to counter any continuation or reoccurrence of the downturn or disruptions. A significant global economic downturn or disruptions in the financial markets would have a material adverse effect on our financial position, results of operations and cash flows.

Adverse changes in currency exchange rates could negatively affect our financial results.

The financial condition and results of operations of some of our operating entities are reported in various currencies and then translated into euros at the applicable exchange rate for inclusion in our historical combined and consolidated financial statements. As a result, the appreciation of the euro against the currencies of our operating local entities may have a negative impact on reported revenues and operating profit, and the resulting accounts receivable, while depreciation of the euro against these currencies may generally have a positive effect on reported revenues and operating profit. We do not hedge translation of forecasted results or actual results.

In addition, while the majority of costs incurred are denominated in local currencies, a portion of the revenues are denominated in U.S. dollars. As a result, appreciation in the U.S. dollar may have a positive impact

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on earnings while depreciation of the U.S. dollar may have a negative impact on earnings. While we engage in significant hedging activity to attempt to mitigate this foreign transactions currency risk, this may not fully protect us from adverse effects due to currency fluctuations on our business, financial condition or results of operations.

A portion of our revenues is derived from our international operations, which exposes us to certain risks inherent in doing business abroad.

We have operations primarily in the United States, Germany, France, Slovakia, Switzerland, the Czech Republic and China and primarily sell our products across Europe, Asia and North America. We also continue to explore opportunities to expand our international operations, particularly in other parts of Asia. Our operations generally are subject to financial, political, economic and business risks in connection with our global operations, including:

The occurrence of any of these events could cause our costs to rise, limit growth opportunities or have a negative effect on our operations and our ability to plan for future periods. In certain emerging markets, the degree of these risks may be higher due to more volatile economic conditions, less developed and predictable legal and regulatory regimes and increased potential for various types of adverse governmental action.

Our results of operations, cash flows and liquidity could be adversely affected if we are unable to execute on our hedging policy, if counterparties to our derivative instruments fail to honor their agreements or if we are unable to purchase derivative instruments.

We purchase and sell LME and other forwards, futures and options contracts as part of our efforts to reduce our exposure to changes in currency exchange rates, aluminum prices and other raw materials prices. Our ability to realize the benefit of our hedging program is dependent upon many factors, including factors that are beyond our control. For example, our foreign exchange hedges are scheduled to mature on the expected payment date by the customer; therefore, if the customer fails to pay an invoice on time and does not warn us in advance, we may be unable to reschedule the maturity date of the foreign exchange hedge, which could result in an outflow of foreign currency that will not be offset until the customer makes the payment. We may realize a gain or a loss in unwinding such hedges. In addition, our metal-price hedging programs depend on our ability to match our monthly exposure to sold and purchased metal, which can be made difficult by seasonal variations in metal demand, unplanned changes in metal delivery dates by either us or by our customers and other disruptions to our inventories, including for maintenance.

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We may also be exposed to losses if the counterparties to our derivative instruments fail to honor their agreements. Further, if major financial institutions continue to consolidate and are forced to operate under more restrictive capital constraints and regulations, there could be less liquidity in the derivative markets, which could have a negative effect on our ability to hedge and transact with creditworthy counterparties.

To the extent our hedging transactions fix prices or exchange rates and primary aluminum prices, energy costs or foreign exchange rates are below the fixed prices or rates established by our hedging transactions, our income and cash flows will be lower than they otherwise would have been. Further, we do not apply hedge accounting to our forwards, futures or option contracts. As a result, unrealized gains and losses on our derivative financial instruments must be reported in our consolidated results of operations. The inclusion of such unrealized gains and losses in earnings may produce significant period to period earnings volatility that is not necessarily reflective of our underlying operating performance. In addition, in certain scenarios when market price movements result in a decline in value of our current derivatives position, our mark-to-market expense may exceed our credit line and counterparties may request the posting of cash collateral which, in turn, can be a significant demand on our liquidity.

At certain times, hedging instruments may simply be unavailable or not available on terms acceptable to us. In addition, recent legislation has been adopted to increase the regulatory oversight of over-the-counter derivatives markets and derivative transactions. Final regulations pursuant to this legislation defining which companies will be subject to the legislation have not yet been adopted. If future regulations subject us to additional capital or margin requirements or other restrictions on our trading and commodity positions, they could have an adverse effect on our financial condition and results of operations.

Aluminum may become less competitive with alternative materials, which could reduce our share of industry sales, lower our selling prices and reduce our sales volumes.

Our fabricated aluminum products compete with products made from other materials—such as steel, glass, plastics and composites—for various applications. Higher aluminum prices relative to substitute materials tend to make aluminum products less competitive with these alternative materials. Environmental and other regulations may also increase our costs and may be passed on to our customers, and may restrict the use of chemicals needed to produce aluminum products. These regulations may make our products less competitive as compared to materials that are subject to fewer regulations.

Customers in our end-markets, including the aerospace, automotive and can sectors, use and continue to evaluate the further use of alternative materials to aluminum in order to reduce the weight and increase the efficiency of their products. Although trends in “lightweighting” have generally increased rates of using aluminum as a substitution of other materials, the willingness of customers to accept substitutions for aluminum, or the ability of large customers to exert leverage in the marketplace to reduce the pricing for fabricated aluminum products, could adversely affect the demand for our products, and thus materially adversely affect our financial position, results of operations and cash flows.

We are dependent on a limited number of suppliers for a substantial portion of our primary and scrap aluminum.

We have supply arrangements with a limited number of suppliers for aluminum and other raw materials. Our top 10 suppliers (which include Rio Tinto) accounted for approximately 46% of our total purchases at December 31, 2012. Increasing aluminum demand levels have caused regional supply constraints in the industry, and further increases in demand levels could exacerbate these issues. We maintain long-term contracts for a majority of our supply requirements, and for the remainder we depend on annual and spot purchases. There can be no assurance that we will be able to renew, or obtain replacements for, any of our long-term contracts when they expire on terms that are as favorable as our existing agreements or at all. Additionally, if any of our key suppliers is unable to deliver sufficient quantities of this material on a timely basis, our production may be

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disrupted and we could be forced to purchase primary metal and other supplies from alternative sources, which may not be available in sufficient quantities or may only be available on terms that are less favorable to us. As a result, an interruption in key supplies required for our operations could have a material adverse effect on our ability to produce and deliver products on a timely or cost-efficient basis and therefore on our financial condition, results of operations and cash flows. In addition, a significant downturn in the business or financial condition of our significant suppliers exposes us to the risk of default by the supplier on our contractual agreements, and this risk is increased by weak and deteriorating economic conditions on a global, regional or industry sector level.

We also depend on scrap aluminum for our operations and acquire our scrap inventory from numerous sources. These suppliers generally are not bound by long-term contracts and have no obligation to sell scrap metal to us. In periods of low inventory prices, suppliers may elect to hold scrap until they are able to charge higher prices. In addition, the slowdown in industrial production and consumer consumption during the recent economic crisis reduced and may continue to reduce the supply of scrap metal available. If an adequate supply of scrap metal is not available to us, we would be unable to recycle metals at desired volumes and our results of operation, financial condition and cash flows could be materially adversely affected.

If we were to lose order volumes from any of our largest customers, our sales volumes, revenues and cash flows would be reduced.

Our business is exposed to risks related to customer concentration. Our ten largest customers accounted for approximately 43% of our consolidated revenues for the year ended December 31, 2012. A significant downturn in the business or financial condition of our significant customers exposes us to the risk of default on contractual agreements and trade receivables, and this risk is increased by weak and deteriorating economic conditions on a global, regional or industry sector level.

We have long-term contracts with a significant number of our customers, some of which are subject to renewal, renegotiation or re-pricing at periodic intervals or upon changes in competitive supply conditions. Our failure to successfully renew, renegotiate or re-price such agreements, or a material deterioration in or termination of these customer relationships, could result in a reduction or loss in customer purchase volume or revenue, and if we are not successful in replacing business lost from such customers, our results of operations, financial condition and cash flows could be materially adversely affected.

In addition, our strategy of having dedicated facilities and arrangements with customers subjects us to the inherent risk of increased dependence on a single or a few customers with respect to these facilities. In such cases, the loss of such a customer, or the reduction of that customer’s business at one or more of our facilities, could negatively affect our financial condition and results of operations, and we may be unable to timely replace, or replace at all, lost order volumes and revenue.

We may not be able to compete successfully in the highly competitive markets in which we operate, and new competitors could emerge, which could negatively impact our share of industry sales, sales volumes and selling prices.

We are engaged in a highly competitive industry. We compete in the production and sale of rolled aluminum products with a number of other aluminum rolling mills, including large, single-purpose sheet mills, continuous casters and other multi-purpose mills, some of which are larger and have greater financial and technical resources than we do. Producers with a different cost basis may, in certain circumstances, have a competitive pricing advantage. Our competitors may be better able to withstand reductions in price or other adverse industry or economic conditions.

In addition, a current or new competitor may also add or build new capacity, which could diminish our profitability by decreasing the equilibrium prices in our markets. New competitors could emerge from within Europe or North America or globally, including from China, Russia and the Middle East. Emerging or

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transitioning markets in these regions with abundant natural resources, low-cost labor and energy, and lower environmental and other standards may pose a significant competitive threat to our business. Our competitive position may also be affected by exchange rate fluctuations that may make our products less competitive in relation to the products of companies based in other countries and economies of scale in purchasing, production and sales. Changes in regulation that have a disproportionately negative effect on us or our methods of production may also diminish our competitive advantage and industry position. In addition, technological innovation is important to our customers who require us to lead or keep pace with new innovations to address their needs. If we do not compete successfully, our share of industry sales, sales volumes and selling prices may be negatively impacted.

In addition, the aluminum industry has experienced consolidation over the past years and there may be further industry consolidation in the future. Although industry consolidation has not yet had a significant negative impact on our business, if we do not have sufficient market presence or are unable to differentiate ourselves from our competitors, we may not be able to compete successfully against other companies. If as a result of consolidation, our competitors are able to obtain more favorable terms from suppliers or otherwise take actions that could increase their competitive strengths, our competitive position and therefore our business, results of operations and financial condition may be materially adversely affected.

The price volatility of energy costs may adversely affect our profitability.

Our operations use natural gas and electricity, which represent the third largest component of our cost of sales, after metal and labor costs. We purchase part of our natural gas and electricity on a spot-market basis. The volatility in costs of fuel, principally natural gas, and other utility services, principally electricity, used by our production facilities affect operating costs. Fuel and utility prices have been, and will continue to be, affected by factors outside our control, such as supply and demand for fuel and utility services in both local and regional markets as well as governmental regulation and imposition of further taxes on energy. Although we have secured some of our natural gas and electricity under fixed price commitments, future increases in fuel and utility prices, or disruptions in energy supply, may have an adverse effect on our financial position, results of operations and cash flows.

Regulations regarding carbon dioxide emissions, and unfavorable allocation of rights to emit carbon dioxide or other air emission related issues, could have a material adverse effect on our business, financial condition and results of operations.

Substantial quantities of greenhouse gases are released as a consequence of our operations. Compliance with existing, new or proposed regulations governing such emissions tend to become more stringent over time and could lead to a need for us to further reduce such greenhouse gas emissions, to purchase rights to emit from third parties, or to make other changes to our business, all of which could result in significant additional costs or could reduce demand for our products. In addition, we are a significant purchaser of energy. Existing, new and proposed regulations relating to the emission of carbon dioxide by our energy suppliers could result in materially increased energy costs for our operations, and we may be unable to pass along these increased energy costs to our customers, which could have a material adverse effect on our business, financial condition and results of operations.

Measures to reduce carbon dioxide and other greenhouse gas emissions that could directly or indirectly affect us or our suppliers are currently being developed or may be developed in the future. Many scientists, legislators and others attribute climate change to increased levels of greenhouse gases, including carbon dioxide, which has led to significant legislative and regulatory efforts to limit greenhouse gas emissions. Existing and possible new regulations regarding carbon dioxide and other greenhouse gas emissions, especially a revised European emissions trading system or a successor to the Kyoto Protocol under the United Nations Framework Convention on Climate Change, could have a material adverse effect on our business, financial condition and results of operations.

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Our fabrication process is subject to regulations that may hinder our ability to manufacture our products. Some of the chemicals we use on our fabrication processes are subject to government regulation, such as REACH (Registration, Evaluation, Authorisation, and Restriction of Chemical substances) in the European Union. Under REACH, we are required to register some of our products with the European Chemicals Agency, and this process could cause significant delays or costs. If we fail to comply with these or similar laws and regulations, we may be required to make significant expenditures to reformulate the chemicals that we use in our products and materials or incur costs to register such chemicals to gain and/or regain compliance, and we may lose customers or revenue as a result. Additionally, we could be subject to significant fines or other civil and criminal penalties should we not achieve such compliance. To the extent that other nations in which we operate also require chemical registration, potential delays similar to those in Europe may delay our entry into these markets. Any failure to obtain or delay in obtaining regulatory approvals for chemical products used in our facilities could have a material adverse effect on our business, financial condition and results of operations.

We may not be able to successfully develop and implement new technology initiatives and other strategic investments in a timely manner.

We have invested in, and are involved with, a number of technology and process initiatives, including the development of new aluminum-lithium products. Being at the forefront of technological development is important to remain competitive. Several technical aspects of certain of these initiatives are still unproven and/or the eventual commercial outcomes and feasibility cannot be assessed with any certainty. Even if we are successful with these initiatives, we may not be able to bring them to market as planned before our competitors or at all, and the initiatives may end up costing more than expected. As a result, the costs and benefits from our investments in new technologies and the impact on our financial results may vary from present expectations.

In addition, we have undertaken and may continue to undertake growth, streamlining and productivity initiatives to improve performance, including with respect to our AIRWARE ^® material solution. We cannot assure you that these initiatives will be completed or that they will have their intended benefits, such as the realization of estimated cost saving from such activities. Capital investments in debottlenecking or other organic growth initiatives may not produce the returns we anticipate. Even if we are able to generate new efficiencies successfully in the short- to medium-term, we may not be able to continue to reduce cost and increase productivity over the long term.

Our business requires substantial capital investments that we may be unable to fulfill.

Our operations are capital intensive. Our total capital expenditures were €126 million for the year ended December 31, 2012 and €97 million and €51 million for the years ended December 31, 2011 and 2010, respectively. We may not generate sufficient operating cash flows and our external financing sources may not be available in an amount sufficient to enable us to make anticipated capital expenditures, service or refinance our indebtedness or fund other liquidity needs. If we are unable to make upgrades or purchase new plants and equipment, our financial condition and results of operations could be materially adversely affected by higher maintenance costs, lower sales volumes due to the impact of reduced product quality, and other competitive factors.

As part of our ongoing evaluation of our operations, we may undertake additional restructuring efforts in the future which could in some instances result in significant severance-related costs and other restructuring charges.

We recorded restructuring charges of €25 million for the year ended December 31, 2012, €20 million for the year ended December 31, 2011 and €6 million for the year ended December 31, 2010. The 2012 costs are primarily in relation to an efficiency improvement program ongoing at our Sierre, Switzerland facility and corporate restructuring. Restructuring costs in 2011 were primarily in relation to corporate restructuring and full-time employee reductions throughout our operations. We may pursue additional restructuring activities in the

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future, which could result in significant severance-related costs, impairment charges, restructuring charges and related costs and expenses, including resulting labor disputes, which could materially adversely affect our profitability and cash flows.

A deterioration in our financial position or a downgrade of our ratings by a credit rating agency could increase our borrowing costs and our business relationships could be adversely affected.

A deterioration of our financial position or a downgrade of our credit ratings for any reason could increase our borrowing costs and have an adverse effect on our business relationships with customers, suppliers and hedging counterparties. As discussed above, we enter into various forms of hedging arrangements against currency, interest rate or metal price fluctuations and trade metal contracts on the LME. Financial strength and credit ratings are important to the availability and pricing of these hedging and trading activities. As a result, any downgrade of our credit ratings may make it more costly for us to engage in these activities, and changes to our level of indebtedness may make it more difficult or costly for us to engage in these activities in the future.

In addition, a downgrade could adversely affect our existing financing, limit access to the capital or credit markets, or otherwise adversely affect the availability of other new financing on favorable terms, if at all, result in more restrictive covenants in agreements governing the terms of any future indebtedness that we incur, increase our borrowing costs, or otherwise impair our business, financial condition and results of operations.

Our indebtedness could materially adversely affect our ability to invest in or fund our operations, limit our ability to react to changes in the economy or our industry or force us to take alternative measures.

Our indebtedness impacts our flexibility in operating our business and could have important consequences for our business and operations, including the following: (i) it may make us more vulnerable to downturns in our business or the economy; (ii) a substantial portion of our cash flows from operations will be dedicated to the repayment of our indebtedness and will not be available for other purposes; (iii) it may restrict us from making strategic acquisitions, introducing new technologies or exploiting business opportunities; and (iv) it may adversely affect the terms under which suppliers provide goods and services to us. As further described in “Description of Certain Indebtedness,” we recently refinanced our $200 million Original Term Loan (€151 million at the year-end exchange rate) by entering into a seven-year term loan in the aggregate principal amount of $360 million and €75 million (equivalent to €347 million in the aggregate at the year-end exchange rate). By increasing our indebtedness as a result of the refinancing, we have made ourselves more susceptible to the risks discussed above.

If we are unable to meet our debt service obligations and pay our expenses, we may be forced to reduce or delay business activities and capital expenditures, sell assets, obtain additional debt or equity capital, restructure or refinance all or a portion of our debt before maturity or take other measures. Such measures may materially adversely affect our business. If these alternative measures are unsuccessful, we could default on our obligations, which could result in the acceleration of our outstanding debt obligations and could have a material adverse effect on our business, results of operations and financial condition.

The terms of our indebtedness contain covenants that restrict our current and future operations, and a failure by us to comply with those covenants may materially adversely affect our business, results of operations and financial condition.

Our indebtedness contains, and any future indebtedness we may incur would likely contain, a number of restrictive covenants that will impose significant operating and financial restrictions on our ability to, among other things: (i) incur or guarantee additional debt; (ii) pay dividends and make other restricted payments; (iii) create or incur certain liens; (iv) make certain loans, acquisitions or investments; (v) engage in sale of assets and subsidiary stock; (vi) enter into transactions with affiliates; (vii) transfer all or substantially all of our assets or enter into merger or consolidation transactions; and (viii) enter into sale and lease-back transactions. In

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addition, after the initial public offering, our Term Loan will require us to maintain a consolidated secured net leverage ratio of no more than 3.00 to 1.00. As a result of these covenants, we may be limited in the manner in which we conduct our business, and we may be unable to engage in favorable business activities or finance future operations or capital needs.

A failure to comply with our debt covenants could result in an event of default that, if not cured or waived, could have a material adverse effect on our business, results of operations and financial condition. If we default under our indebtedness, our lenders may not be required to lend additional amounts to us and could in certain circumstances elect to declare all outstanding borrowings, together with accrued and unpaid interest and fees, to be due and payable, or take other remedial actions. Our existing indebtedness also contains cross-default provisions, which means that if an event of default occurs under certain material indebtedness, such event of default will trigger an event of default under our other indebtedness. If our indebtedness were to be accelerated, we cannot assure you that our assets would be sufficient to repay such indebtedness in full and our lenders could foreclose on our pledged assets. See “Description of Certain Indebtedness.”

Our variable rate indebtedness subjects us to interest rate risk, which could cause our annual debt service obligations to increase significantly.

A portion of our indebtedness is subject to variable rates of interest and exposes us to interest rate risk. See “Description of Certain Indebtedness.” If interest rates increase, our debt service obligations on the variable rate indebtedness would increase, resulting in a reduction of our net income, even though the amount borrowed would remain the same.

We could be required to make unexpected contributions to our defined benefit pension plans as a result of adverse changes in interest rates and the capital markets.

Most of our pension obligations relate to funded defined benefit pension plans for our employees in the United States, unfunded pension benefits in France, Switzerland and Germany, and lump sum indemnities payable to our employees in France and Germany upon retirement or termination. Our pension plan assets consist primarily of funds invested in listed stocks and bonds. Our estimates of liabilities and expenses for pensions and other post-retirement benefits incorporate a number of assumptions, including expected long-term rates of return on plan assets and interest rates used to discount future benefits. Our results of operations, liquidity or shareholders’ equity in a particular period could be materially adversely affected by capital market returns that are less than their assumed long-term rate of return or a decline in the rate used to discount future benefits. If the assets of our pension plans do not achieve assumed investment returns for any period, such deficiency could result in one or more charges against our earnings for that period. In addition, changing economic conditions, poor pension investment returns or other factors may require us to make unexpected cash contributions to the pension plans in the future, preventing the use of such cash for other purposes.

We could experience labor disputes that disrupt our business.

A significant number of our employees (approximately 80% of our total headcount) are represented by unions or equivalent bodies and are covered by collective bargaining or similar agreements that are subject to periodic renegotiation. Although we believe that we will be able to successfully negotiate new collective bargaining agreements when the current agreements expire, these negotiations may not prove successful, may result in a significant increase in the cost of labor, or may break down and result in the disruption or cessation of our operations. For example, we experienced work stoppages and labor disturbances at our Ravenswood facility in early August 2012 in conjunction with the renegotiation of the collective bargaining agreement; the Ravenswood employees returned to work in mid-September 2012. In addition, and mainly in Europe, existing collective bargaining agreements may not prevent a strike or work stoppage at our facilities in the future. Any such stoppages or disturbances may have a negative impact on our financial condition and results of operations by limiting plant production, sales volumes, profitability and operating costs.

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The loss of certain members of our management team may have a material adverse effect on our operating results.

Our success will depend, in part, on the efforts of our senior management and other key employees. These individuals possess sales, marketing, engineering, technical, manufacturing, financial and administrative skills that are critical to the operation of our business. If we lose or suffer an extended interruption in the services of one or more of our senior officers or other key employees, our ability to operate and expand our business, improve our operations, develop new products, and, as a result, our financial condition and results of operations, may be negatively affected. Moreover, the pool of qualified individuals is highly competitive, and we may not be able to attract and retain qualified personnel to replace or succeed members of our senior management or other key employees, should the need arise.

In addition, in light of demographic trends in the labor markets where we operate, we expect that our factories will be confronted with high levels of natural attrition in the coming years due to retirements. Strategic workforce planning will be a challenge to ensure a controlled exit of skills and competencies and the timely acquisition of new talent and competencies, in line with changing technological and industrial needs.

We have a short history as a standalone company which may pose operational challenges to our management.

Following the closing of the Acquisition, we are no longer owned by Rio Tinto. Our management team has faced and could continue to face operational and organizational challenges and costs related to establishing ourselves as a standalone company, such as establishing various corporate functions, formulating policies, preparing standalone financial statements and integrating the management team. These challenges may divert their attention from running our core business or otherwise materially adversely affect our operating results.

If we do not adequately maintain and evolve our financial reporting and internal controls, we may be unable to accurately report our financial results or prevent fraud and may, as a result, become subject to sanctions by the SEC. Establishing effective internal controls may also result in higher than anticipated operating expenses.

We expect that we will need to continue to improve existing, and implement new, financial reporting and management systems, procedures and controls to manage our business effectively and support our growth in the future, especially because we lack a history of operations as a standalone entity. Any delay in the implementation of, or disruption in the transition to, new or enhanced systems, procedures and controls, or the obsolescence of existing financial control systems, could harm our ability to accurately forecast sales demand and record and report financial and management information on a timely and accurate basis.

Moreover, to comply with our obligations as a public company under Section 404 of the Sarbanes-Oxley Act of 2002, we must enhance and maintain our internal controls. Effective internal controls are necessary for us to provide reliable financial reports and prevent fraud. We are in the process of refining and enhancing our internal controls to satisfy the requirements of Section 404, which requires annual management assessments of the effectiveness of our internal controls over financial reporting and a report by our independent auditors addressing these assessments starting with our annual report for the year ending December 31, 2014. We are working to establish internal controls that will facilitate compliance with these requirements, and we may accordingly experience higher than anticipated operating expenses, as well as increased independent auditor fees as we continue our compliance efforts.

If we fail to comply with the requirements of Section 404 in a timely manner, we might be subject to sanctions or investigations by regulatory authorities such as the SEC. If we do not adequately implement improvements to our disclosure controls and procedures or to our internal controls in a timely manner, our independent registered public accounting firm may not be able to certify as to the effectiveness of our internal

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control over financial reporting. This may subject us to adverse regulatory consequences or a loss of confidence in the reliability of our financial statements.

We could also suffer a loss of confidence in the reliability of our financial statements if our independent registered public accounting firm reports a material weakness in our internal controls, if we do not develop and maintain effective controls and procedures or if we are otherwise unable to deliver timely and reliable financial information. Any loss of confidence in the reliability of our financial statements or other negative reaction to our failure to develop timely or adequate disclosure controls and procedures or internal controls could result in a decline in the trading price of our ordinary shares. In addition, if we fail to remedy any material weakness, our financial statements may be inaccurate, we may face restricted access to the capital markets and the price of our ordinary shares may be materially adversely affected.

We may not be able to adequately protect proprietary rights to our technology.

Our success depends in part upon our proprietary technology and processes. We believe that our intellectual property has significant value and is important to the marketing of our products and maintaining our competitive advantage. Although we attempt to protect our intellectual property rights both in the United States and in foreign countries through a combination of patent, trademark, trade secret and copyright laws, as well as through confidentiality and nondisclosure agreements and other measures, these measures may not be adequate to fully protect our rights. For example, we have a growing presence in China, which historically has afforded less protection to intellectual property rights than the United States or the Netherlands. Our failure to obtain or maintain adequate protection of our intellectual property rights for any reason could have a material adverse effect on our business, results of operations and financial condition.

We have applied for patent protection relating to certain existing and proposed products and processes. While we generally apply for patents in those countries where we intend to make, have made, use or sell patented products, we may not accurately predict all of the countries where patent protection will ultimately be desirable. If we fail to timely file a patent application in any such country, we may be precluded from doing so at a later date. Furthermore, we cannot assure you that any of our patent applications will be approved. We also cannot assure you that the patents issuing as a result of our foreign patent applications will have the same scope of coverage as our United States patents. The patents we own could be challenged, invalidated or circumvented by others and may not be of sufficient scope or strength to provide us with any meaningful protection or commercial advantage. Further, we cannot assure you that competitors will not infringe our patents, or that we will have adequate resources to enforce our patents.

We also rely on unpatented proprietary technology. It is possible that others will independently develop the same or similar technology or otherwise obtain access to our unpatented technology. To protect our trade secrets and other proprietary information, we require employees, consultants, advisors and collaborators to enter into confidentiality agreements. We cannot assure you that these agreements will provide meaningful protection for our trade secrets, know-how or other proprietary information in the event of any unauthorized use, misappropriation or disclosure of such trade secrets, know-how or other proprietary information. If we are unable to maintain the proprietary nature of our technologies, we could be materially adversely affected.

We rely on our trademarks, trade names and brand names to distinguish our products from the products of our competitors, and have registered or applied to register many of these trademarks. We cannot assure you that our trademark applications will be approved. Third parties may also oppose our trademark applications, or otherwise challenge our use of the trademarks. In the event that our trademarks are successfully challenged, we could be forced to rebrand our products, which could result in loss of brand recognition, and could require us to devote resources to advertising and marketing new brands. Further, we cannot assure you that competitors will not infringe our trademarks, or that we will have adequate resources to enforce our trademarks.

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We may institute or be named as a defendant in litigation regarding our intellectual property and such litigation may be costly and divert management’s attention and resources.

Any attempts to enforce our intellectual property rights, even if successful, could result in costly and prolonged litigation, divert management’s attention and resources, and materially adversely affect our results of operations and cash flows. The unauthorized use of our intellectual property may adversely affect our results of operations as our competitors would be able to utilize such property without having had to incur the costs of developing it, thus potentially reducing our relative profitability.

Furthermore, we may be subject to claims that we have infringed the intellectual property rights of another. Even if without merit, such claims could result in costly and prolonged litigation, cause us to cease making, licensing or using products or technologies that incorporate the challenged intellectual property, require us to redesign, reengineer or rebrand our products, if feasible, divert management’s attention and resources, and materially adversely affect our results of operations and cash flows. We may also be required to enter into licensing agreements in order to continue using technology that is important to our business, or we may be unable to obtain license agreements on acceptable terms, either of which could negatively affect our financial position, results of operations and cash flows.

Failure to protect our information systems against cyber-attacks or information security breaches could have a material adverse effect on our business.

Information security risks have generally increased in recent years because of the proliferation of new technologies and the increased sophistication and activities of perpetrators of cyber-attacks. A failure in or breach of our information systems as a result of cyber-attacks or information security breaches could disrupt our business, result in the disclosure or misuse of confidential or proprietary information, damage our reputation, increase our costs or cause losses. As cyber threats continue to evolve, we may be required to expend additional resources to continue to enhance our information security measures or to investigate and remediate any information security vulnerabilities.

Current liabilities under, as well as the cost of compliance with, environmental, health and safety laws could increase our operating costs and negatively affect our financial condition and results of operations.

Our operations are subject to federal, state and local laws and regulations in the jurisdictions where we do business, which govern, among other things, air emissions, wastewater discharges, the handling, storage and disposal of hazardous substances and wastes, the remediation of contaminated sites, and employee health and safety. At December 31, 2012, we had close-down and environmental restoration costs provisions of €56 million. Future environmental regulations could impose stricter compliance requirements on the industries in which we operate. Additional pollution control equipment, process changes, or other environmental control measures may be needed at some of our facilities to meet future requirements. If we are unable to comply with these laws and regulations, we could incur substantial costs, including fines and civil or criminal sanctions, or costs associated with upgrades to our facilities or changes in our manufacturing processes in order to achieve and maintain compliance.

Financial responsibility for contaminated property can be imposed on us where current operations have had an environmental impact. Such liability can include the cost of investigating and remediating contaminated soil or ground water, fines and penalties sought by environmental authorities, and damages arising out of personal injury, contaminated property and other toxic tort claims, as well as lost or impaired natural resources. Certain environmental laws impose strict, and in certain circumstances joint and several, liability for certain kinds of matters, such that a person can be held liable without regard to fault for all of the costs of a matter even though others were also involved or responsible.

We have accrued, and expect to accrue, costs relating to the above matters that are reasonably expected to be incurred based on available information. However, it is possible that actual costs may differ, perhaps

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significantly, from the amounts expected or accrued. Similarly, the timing of those expenditures may occur faster than anticipated. These differences could negatively affect our financial position, results of operations and cash flows.

Other legal proceedings or investigations, or changes in applicable laws and regulations, could increase our operating costs and negatively affect our financial condition and results of operations.

In addition to the matters described above, we may from time-to-time be involved in, or be the subject of, disputes, proceedings and investigations with respect to a variety of matters, including matters related to personal injury, intellectual property, employees, taxes, contracts, anti-competitive or anti-corruption practices as well as other disputes and proceedings that arise in the ordinary course of business. It could be costly to address these claims or any investigations involving them, whether meritorious or not, and legal proceedings and investigations could divert management’s attention as well as operational resources, negatively affecting our financial position, results of operations and cash flows. Additionally, as with the environmental laws and regulations, other laws and regulations which govern our business are subject to change at any time. Compliance with changes to existing laws and regulations could have a material adverse effect on our financial position, results of operations and cash flows.

Product liability claims against us could result in significant costs and could materially adversely affect our reputation and our business.

If any of the products that we sell are defective or cause harm to any of our customers, we could be exposed to product liability lawsuits and/or warranty claims. If we were found liable under product liability claims or are obligated under warranty claims, we could be required to pay substantial monetary damages. We believe we possess adequate product liability insurance to match our level of exposure. However, even if we successfully defend ourselves against these types of claims, we could still be forced to spend a substantial amount of money in litigation expenses, our management could be required to devote significant time and attention to defending against these claims, and our reputation could suffer, any of which could harm our business.

Our operations present significant risk of injury or death.

Because of the heavy industrial activities conducted at our facilities, there exists a risk of injury or death to our employees or other visitors, notwithstanding the safety precautions we take. Our operations are subject to regulation by national, state and local agencies responsible for employee health and safety, which has from time to time levied fines against us for certain isolated incidents. While such fines have not been material and we have in place policies to minimize such risks, we may nevertheless be unable to avoid material liabilities for any employee death or injury that may occur in the future, and any such incidents may materially adversely impact our reputation. Over the last three years, none of the incidents resulting in employee fatalities or significant injuries have resulted in significant disruptions of operations, losses or liabilities.

The insurance that we maintain may not fully cover all potential exposures.

We maintain property, casualty and workers’ compensation insurance, but such insurance does not cover all risks associated with the hazards of our business and is subject to limitations, including deductibles and maximum liabilities covered. We may incur losses beyond the limits, or outside the coverage, of our insurance policies, including liabilities for environmental compliance or remediation. In addition, from time to time, various types of insurance for companies in our industries have not been available on commercially acceptable terms or, in some cases, have not been available at all. In the future, we may not be able to obtain coverage at current levels, and our premiums may increase significantly on coverage that we maintain.

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Increases in our effective tax rate and exposures to additional income tax liabilities due to audits could materially adversely affect our business.

We operate in multiple tax jurisdictions and pay tax on our income according to the tax laws of these jurisdictions. Various factors, some of which are beyond our control, determine our effective tax rate and/or the amount we are required to pay, including changes in or interpretations of tax laws in any given jurisdiction, our ability to use net operating loss and tax credit carry forwards and other tax attributes, changes in geographical allocation of income and expense, and our judgment about the realizability of deferred tax assets. Such changes to our effective tax rate could materially adversely affect our financial position, liquidity, results of operations and cash flows.

In addition, due to the size and nature of our business, we are subject to ongoing reviews by taxing jurisdictions on various tax matters, including challenges to positions we assert on our income tax and withholding tax returns. We accrue income tax liabilities and tax contingencies based upon our best estimate of the taxes ultimately expected to be paid after considering our knowledge of all relevant facts and circumstances, existing tax laws, our experience with previous audits and settlements, the status of current tax examinations and how the tax authorities view certain issues. Such amounts are included in income taxes payable, other non-current liabilities or deferred income tax liabilities, as appropriate, and updated over time as more information becomes available. We record additional tax expense in the period in which we determine that the recorded tax liability is less than the ultimate assessment we expect. We are currently subject to audit and review in a number of jurisdictions in which we operate, and further audits may commence in the future.

Our historical and adjusted financial information presented in this prospectus may not be representative of results we would have achieved as an independent company or of our future results.

The historical and adjusted financial information we have included in this prospectus does not necessarily reflect what our results of operations, financial position or cash flows would have been had we been an independent company during the periods presented. For this reason, as well as the inherent uncertainties of our business, the historical and adjusted financial information does not necessarily indicate what our results of operations, financial position, cash flows or costs and expenses will be in the future. Past performance is not necessarily an indicator of future performance. In addition, our financial results as a subsidiary of Rio Tinto may not be indicative of our results as a standalone company, as they may not be directly comparable.

We are principally owned by Apollo Funds, Rio Tinto and FSI, and their interests may conflict with or differ from your interests as a shareholder.

After the completion of this offering, Apollo Funds, Rio Tinto and FSI will continue to own a significant amount of our equity and their interests may not always be aligned with yours. In addition, our directors will be elected by our shareholders at a General Meeting upon a binding nomination by the non-executive directors as described in “Management—Board Structure.” The General Meeting may at all times overrule the binding nature of such nomination by a resolution adopted by a majority of at least two-thirds of the votes cast, provided that such majority represents more than 50% of our issued share capital. Therefore, so long as Apollo Funds, Rio Tinto and FSI in the aggregate hold more than one-third of our outstanding ordinary shares, and vote such shares at the general meeting in accordance with the voting arrangements pursuant to an agreement among the shareholders, the binding nomination of the non-executive directors cannot be overruled by the other holders of our ordinary shares. If the binding nomination is overruled, the non-executive directors may then make a new nomination. If such a nomination has not been made or has not been made in time, this shall be stated in the notice and the General Meeting shall be free to appoint a director in its discretion. Such a resolution of the General Meeting must be adopted by at least two-thirds of the votes cast, provided that such majority represents more than 50% of our issued share capital. As noted above, Apollo Funds, Rio Tinto and FSI will be required to vote the ordinary shares held by them at the general meeting in respect of the election of directors in accordance with certain voting arrangements pursuant to their shareholders agreement with Constellium. See “Certain

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Relationships and Related Party Transactions—Amended and Restated Shareholders Agreement.” These shareholders may have interests that are different from yours and they may exercise their voting and other rights in a manner that may be adverse to your interests.

In addition, this concentration of ownership could have the effect of delaying or preventing a change in control or otherwise discouraging a potential acquirer from attempting to obtain control of us, which could cause the market price of our ordinary shares to decline or prevent our shareholders from realizing a premium over the market price for their ordinary shares.

Apollo Funds make investments in companies in the ordinary course of Apollo’s business and Apollo Funds currently hold, and may from time to time in the future acquire, controlling interests in businesses engaged in the metals industry that complement or directly or indirectly compete with certain portions of our business. So long as Apollo Funds continue to indirectly own a significant amount of our equity, even if such amount is less than 50%, Apollo Funds will continue to be able to strongly influence or effectively control our business decisions.

We are a foreign private issuer under the U.S. securities laws within the meaning of the NYSE rules. As a result, we will qualify for and may rely on exemptions from certain corporate governance requirements.

As a “foreign private issuer,” as such term is defined in Rule 405 under the Securities Act, we are permitted to follow our home country practice in lieu of certain corporate governance requirements of the NYSE, including that (i) a majority of the board of directors consists of independent directors; (ii) the nominating and corporate governance committee be composed entirely of independent directors with a written charter addressing the committee’s purpose and responsibilities; and (iii) the compensation committee be composed entirely of independent directors with a written charter addressing the committee’s purpose and responsibilities. Foreign private issuers are also exempt from certain U.S. securities law requirements applicable to U.S. domestic issuers, including the requirement to file quarterly reports on Form 10-Q and to distribute a proxy statement pursuant to Exchange Act Section 14 in connection with the solicitation of proxies for shareholders meetings.

Immediately following this offering, we may rely on the exemptions for foreign private issuers and follow Dutch corporate governance practices in lieu of some or all of the NYSE corporate governance rules specified above. We currently intend to rely on exemptions from the requirements set out in (i), (ii) and (iii) above, but in the future, we may change what home country corporate governance practices we follow, and, accordingly, which exemptions we will rely on from the NYSE requirements. So long as we qualify as a foreign private issuer, you may not have the same protections afforded to shareholders of companies that are subject to all of the NYSE corporate governance requirements.

We may lose our foreign private issuer status in the future, which could result in significant additional costs and expenses.

Although we expect that we will continue to maintain our status as a foreign private issuer, we could cease to be a foreign private issuer if a majority of our outstanding voting securities are directly or indirectly held of record by U.S. residents and we fail to meet additional requirements necessary to avoid loss of foreign private issuer status. The regulatory and compliance costs to us under U.S. securities laws as a U.S. domestic issuer may be significantly more than costs we incur as a foreign private issuer. If we are not a foreign private issuer, we will be required to file periodic reports and registration statements on U.S. domestic issuer forms with the SEC, including proxy statements pursuant to Section 14 of the Exchange Act. These SEC disclosure requirements are more detailed and extensive than the forms available to a foreign private issuer. In addition, our directors, officers and 10% owners would become subject to insider short-swing profit disclosure and recovery rules under Section 16 of the Exchange Act. We may also be required to modify certain of our policies to comply with corporate governance practices associated with U.S. domestic issuers. Such conversion and modifications would involve additional costs.

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In addition, we would lose our ability to rely upon exemptions from certain NYSE corporate governance requirements that are available to foreign private issuers. In particular, within six months of losing our foreign private issuer status we would be required to have a majority of independent directors and a nominating/corporate governance committee and a compensation committee comprised entirely of independent directors, unless other exemptions are available under the NYSE rules. Any of these changes would likely increase our regulatory and compliance costs and expenses, which could have a material adverse effect on our business and financial results.

We do not comply with all the provisions of the Dutch Corporate Governance Code. This may affect your rights as a shareholder.

We are subject to the Dutch Corporate Governance Code, which applies to all Dutch companies listed on a government-recognized stock exchange, whether in the Netherlands or elsewhere, including the NYSE and Euronext Paris. The Dutch Corporate Governance Code contains principles and best practice provisions for boards of directors, shareholders and general meetings of shareholders, financial reporting, auditors, disclosure, compliance and enforcement standards. The Dutch Corporate Governance Code is based on a “comply or explain” principle. Accordingly, companies are required to disclose in their annual reports, filed in the Netherlands, whether they comply with the provisions of the Dutch Corporate Governance Code and, if they do not comply with those provisions, to give the reasons for such non-compliance. The principles and best practice provisions apply to the board (relating to, among other matters, the board’s role and composition, conflicts of interest and independence requirements, board committees and remuneration), shareholders and the general meeting of shareholders (for example, regarding anti-takeover protection and obligations of a company to provide information to its shareholders), and financial reporting (such as external auditor and internal audit requirements). We have decided not to comply with a number of the provisions of the Dutch Corporate Governance Code because such provisions conflict, in whole or in part, with the corporate governance rules of NYSE and U.S. securities laws that apply to our company whose ordinary shares are traded on the NYSE, or because such provisions do not reflect best practices of global companies listed on the NYSE. This may affect your rights as a shareholder and you may not have the same level of protection as a shareholder in a Dutch company that fully complies with the Dutch Corporate Governance Code. See “Description of Capital Stock—Dutch Corporate Governance Code.”

Risks Related to Our Ordinary Shares and the Offering

There is no existing market for our ordinary shares, and we do not know whether one will develop to provide you with adequate liquidity.

Prior to this offering, there has not been a public market for our ordinary shares. If an active trading market does not develop, you may have difficulty selling any of our ordinary shares that you buy. We cannot predict the extent to which investor interest in our ordinary shares will lead to the development of an active trading market on the NYSE, Euronext Paris or otherwise, or how liquid that market might become. Due to the time difference between New York and Paris, or other reasons, there may be a delay in the commencement of trading of shares on NYSE Euronext Paris. In the event of a delay, investors would not be able to sell or otherwise trade shares on NYSE Euronext Paris during that period. The initial public offering price for the ordinary shares will be determined by negotiations among us, the selling shareholders and the underwriters, and may not be indicative of prices that will prevail in the open market following this offering. See “Underwriting (Conflicts of Interest).” Consequently, you may not be able to sell our ordinary shares at prices equal to or greater than the price paid by you in this offering.

The market price of our ordinary shares may fluctuate significantly, and you could lose all or part of your investment.

The market price of our ordinary shares may be influenced by many factors, some of which are beyond our control and could result in significant fluctuations, including: (i) the failure of financial analysts to cover our

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ordinary shares after this offering, changes in financial estimates by analysts or any failure by us to meet or exceed any of these estimates; (ii) actual or anticipated variations in our operating results; (iii) announcements by us or our competitors of significant contracts or acquisitions; (iv) the recruitment or departure of key personnel; (v) regulatory and litigation developments; (vi) developments in our industry; (vii) future sales of our ordinary shares; and (viii) investor perceptions of us and the industries in which we operate.

In addition, the stock market in general has experienced substantial price and volume fluctuations that have often been unrelated or disproportionate to the operating performance of particular companies affected. These broad market and industry factors may materially harm the market price of our ordinary shares, regardless of our operating performance. In the past, following periods of volatility in the market price of certain companies’ securities, securities class action litigation has been instituted against these companies. If any such litigation is instituted against us, it could materially adversely affect our business, results of operations and financial condition.

Transformation into a public company may significantly increase our operating costs and disrupt the regular operations of our business.

This offering will have a significant transformative effect on us. Our business historically has operated as a privately owned company, and we expect to incur significant additional legal, accounting, reporting and other expenses as a result of having publicly traded ordinary shares. We will also incur increased costs or costs which we have not incurred previously, including, but not limited to, costs and expenses for directors’ fees, directors and officers liability insurance, investor relations and various other costs of a public company. The additional demands associated with being a public company may disrupt the regular operations of our business by diverting the attention of our senior management team away from revenue producing activities to management and administrative oversight, adversely affecting our ability to identify and complete business opportunities and increasing the difficulty we face in both retaining professionals and managing and growing our businesses. Any of these effects could materially harm our business, results of operations and financial condition.

We also anticipate that we will incur costs associated with corporate governance requirements, including requirements under the Sarbanes-Oxley Act of 2002, as amended, as well as rules implemented by the SEC and the NYSE. We expect these rules and regulations to increase our legal and financial compliance costs and make some management and corporate governance activities more time-consuming and costly. For example, these rules and regulations may make it more difficult and more expensive for us to obtain director and officer liability insurance, and we may be required to accept reduced policy limits and coverage or incur substantially higher costs to obtain the same or similar coverage. This could have a material adverse impact on our ability to recruit and bring on qualified independent directors.

Sales of substantial amounts of our ordinary shares in the public market, or the perception that these sales may occur, could cause the market price of our ordinary shares to decline.

Sales of substantial amounts of our ordinary shares in the public market, or the perception that these sales may occur, could cause the market price of our ordinary shares to decline. This could also impair our ability to raise additional capital through the sale of our equity securities. Prior to the completion of the offering, we expect to amend our Amended and Restated Articles of Association to provide authorization to issue up to 398,500,000 Class A ordinary shares, 1,500,000 Class B ordinary shares. A total of 99,589,338 Class A ordinary shares, 964,189 Class B ordinary shares will be outstanding upon the completion of this offering. All of the ordinary shares sold in this offering will be freely transferrable without restriction or further registration. We may issue ordinary shares or other securities from time to time as consideration for, or to finance, future acquisitions and investments or for other capital needs. We cannot predict the size of future issuances of our shares or the effect, if any, that future sales and issuances of shares would have on the market price of our ordinary shares. If any such acquisition or investment is significant, the number of ordinary shares or the number or aggregate principal amount, as the case may be, of other securities that we may

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issue may in turn be substantial and may result in additional dilution to our shareholders. We may also grant registration rights covering ordinary shares or other securities that we may issue in connection with any such acquisitions and investments.

Any shareholder acquiring 30% or more of our voting rights may be required to make a mandatory takeover bid or be subject to voting restrictions.

Under Dutch law, if a party directly or indirectly acquires control of a Dutch company, all or part of whose shares are admitted to trading on a regulated market, that party may be required to make a public offer for all other shares of the company (mandatory takeover bid). “Control” is defined as the ability to exercise, whether or not in concert with others, at least 30% of the voting rights at a general meeting of shareholders. Controlling shareholders existing before this offering are generally exempt from this requirement, unless their controlling interest drops below 30% and then increases again to 30% or more. The purpose of this requirement is to protect the interests of minority shareholders. Any shareholder acquiring 30% or more of our voting rights may be limited in its ability to vote on our ordinary shares.

Provisions of our organizational documents and applicable law may impede or discourage a takeover, which could deprive our investors of the opportunity to receive a premium for their ordinary shares or to make changes in our board of directors.

Several provisions of our Amended and Restated Articles of Association and the laws of the Netherlands could make it difficult for our shareholders to change the composition of our board of directors, thereby preventing them from changing the composition of our management. In addition, the same provisions may discourage, delay or prevent a merger, consolidation or acquisition that shareholders may consider favorable. Provisions of our Amended and Restated Articles of Association impose various procedural and other requirements, which could make it more difficult for shareholders to effect certain corporate actions. These anti-takeover provisions could substantially impede the ability of our shareholders to benefit from a change in control and, as a result, may materially adversely affect the market price of our ordinary shares and your ability to realize any potential change of control premium.

Our general meeting of shareholders has empowered our board of directors to issue shares and restrict or exclude preemptive rights on those shares for a period of five years. Accordingly, an issue of new shares may make it more difficult for a shareholder to obtain control over our general meeting of shareholders.

In addition, because certain of our products may have applications in the defense sector, we may be subject to rules and regulations in France and other jurisdictions that could impede or discourage a takeover or other change in control of Constellium or its subsidiaries. In particular, Constellium supplies aluminum alloy products, such as plates, sheets, profiles, tubes and castings, and related services and R&D activities in connection with aerospace and defense programs in France. As a result, a controlling investment in Constellium or certain of Constellium’s French subsidiaries, or the purchase of assets constituting a business which produces products or provides services with applications in the defense sector, by a company or individual that is considered to be foreign or non-resident in France may be subject to the French Monetary and Financial Code, which requires prior authorization of the French Ministry of Economy.

You will suffer an immediate and substantial dilution in the net tangible book value of the ordinary shares you purchase.

The offering price is substantially higher than the adjusted net tangible book value per share of the outstanding ordinary shares immediately after the completion of this offering. Accordingly, based on a public offering price of $18.00 per share, purchasers of ordinary shares in this offering will experience immediate and substantial dilution of approximately $20.60 per share in the adjusted net tangible book value of the ordinary shares. See “Dilution.”

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Because we currently have no plans to pay regular dividends on our ordinary shares for the foreseeable future, you may not receive any return on your investment unless you sell your ordinary shares for a price greater than that which you paid for it.

We currently have no plans to pay regular dividends on our ordinary shares. Any declaration and payment of future dividends to holders of our ordinary shares may be limited by restrictive covenants in our debt agreements, and will be at the sole discretion of our board of directors and will depend on many factors, including our financial condition, earnings, capital requirements, level of indebtedness, cash flows, statutory and contractual restrictions applying to the payment of dividends and other considerations that our board of directors deems relevant. In addition, the agreements governing our current and future indebtedness may restrict our ability to pay dividends on our ordinary shares. As a result, you may not receive any return on your investment unless you sell your ordinary shares for a price greater than that which you paid for it.

We have broad discretion in the use of the net proceeds from this offering and may not use them effectively.

We cannot specify with certainty all of the particular uses of the net proceeds we will receive from this offering. Our management will have broad discretion in the application of the net proceeds, including for any of the purposes described in “Use of Proceeds.” Accordingly, you will have to rely on the judgment of our management with respect to the use of the proceeds, with only limited information concerning management’s specific intentions. Our management may spend a portion or all of the net proceeds from this offering in ways that our shareholders may not desire or that may not yield a favorable return. The failure by our management to apply these funds effectively could harm our business. Pending their use, we may invest the net proceeds from this offering in a manner that does not produce income or that loses value.

United States civil liabilities may not be enforceable against us.

We are incorporated under the laws of the Netherlands and substantial portions of our assets are located outside of the United States. In addition, certain members of our board, our officers and certain experts named herein reside outside the United States. As a result, it may be difficult for investors to effect service of process within the United States upon us or such other persons residing outside the United States, or to enforce outside the United States judgments obtained against such persons in U.S. courts in any action, including actions predicated upon the civil liability provisions of the U.S. federal securities laws. In addition, it may be difficult for investors to enforce, in original actions brought in courts in jurisdictions located outside the United States, rights predicated upon the U.S. federal securities laws.

There is no treaty between the United States and the Netherlands for the mutual recognition and enforcement of judgments (other than arbitration awards) in civil and commercial matters. Therefore, a final judgment for the payment of money rendered by any federal or state court in the United States based on civil liability, whether or not predicated solely upon the U.S. federal securities laws, would not be enforceable in the Netherlands unless the underlying claim is re-litigated before a Dutch court. Under current practice however, a Dutch court will generally grant the same judgment without a review of the merits of the underlying claim if (i) that judgment resulted from legal proceedings compatible with Dutch notions of due process, (ii) that judgment does not contravene public policy of the Netherlands and (iii) the jurisdiction of the United States federal or state court has been based on internationally accepted principles of private international law.

Based on the foregoing, there can be no assurance that U.S. investors will be able to enforce against us or members of our board of directors, officers or certain experts named herein who are residents of the Netherlands or countries other than the United States any judgments obtained in U.S. courts in civil and commercial matters, including judgments under the U.S. federal securities laws.

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In addition, there is doubt as to whether a Dutch court would impose civil liability on us, the members of our board of directors, our officers or certain experts named herein in an original action predicated solely upon the U.S. federal securities laws brought in a court of competent jurisdiction in the Netherlands against us or such members, officers or experts, respectively.

In connection with this offering, we converted from a Dutch private limited liability company to a Dutch public limited liability company. The rights of our shareholders may be different from the rights of shareholders governed by the laws of U.S. jurisdictions.

In connection with this offering we converted from a Dutch private limited liability company ( besloten vennootschap met beperkte aansprakelijkheid ) to a Dutch public limited liability company ( naamloze vennootschap ). Our corporate affairs will be governed by our Amended and Restated Articles of Association and by the laws governing companies incorporated in the Netherlands. The rights of shareholders and the responsibilities of members of our board of directors may be different from the rights and obligations of shareholders in companies governed by the laws of U.S. jurisdictions. In the performance of its duties, our board of directors is required by Dutch law to consider the interests of our company, its shareholders, its employees and other stakeholders, in all cases with due observation of the principles of reasonableness and fairness. It is possible that some of these parties will have interests that are different from, or in addition to, your interests as a shareholder. See “Description of Capital Stock—Dutch Corporate Governance Code” and “Description of Capital Stock—Differences in Corporate Law.”

Although shareholders will have the right to approve legal mergers or demergers, Dutch law does not grant appraisal rights to a company’s shareholders who wish to challenge the consideration to be paid upon a legal merger or demerger of a company. In addition, if a third party is liable to a Dutch company, under Dutch law shareholders generally do not have the right to bring an action on behalf of the company or to bring an action on their own behalf to recover damages sustained as a result of a decrease in value, or loss of an increase in value, of their stock. Only in the event that the cause of liability of such third party to the company also constitutes a tortious act directly against such stockholder and the damages sustained are permanent, may that stockholder have an individual right of action against such third party on its own behalf to recover damages. The Dutch Civil Code provides for the possibility to initiate such actions collectively. A foundation or an association whose objective, as stated in its articles of association, is to protect the rights of persons having similar interests, may institute a collective action. The collective action cannot result in an order for payment of monetary damages but may result in a declaratory judgment ( verklaring voor recht ), for example, declaring that a party has acted wrongfully or has breached a fiduciary duty. The foundation or association and the defendant are permitted to reach (often on the basis of such declaratory judgment) a settlement which provides for monetary compensation for damages. A designated Dutch court may declare the settlement agreement binding upon all the injured parties with an opt-out choice for an individual injured party. An individual injured party, within the period set by the court, may also individually institute a civil claim for damages if such injured party is not bound by a collective agreement.

The provisions of Dutch corporate law and our Amended and Restated Articles of Association have the effect of concentrating control over certain corporate decisions and transactions in the hands of our board of directors. As a result, holders of our shares may have more difficulty in protecting their interests in the face of actions by members of the board of directors than if we were incorporated in the United States.

Exchange rate fluctuations may adversely affect the foreign currency value of the ordinary shares and any dividends.

The ordinary shares will be quoted in U.S. dollars on the NYSE and in euros on Euronext Paris. Our financial statements are prepared in euros. Fluctuations in the exchange rate between euros and the U.S. dollar will affect, among other matters, the U.S. dollar value and the euro value of the ordinary shares and of any dividends.

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If securities or industry analysts do not publish research or reports or publish unfavorable research about our business, our stock price and trading volume could decline.

The trading market for our ordinary shares will depend in part on the research and reports that securities or industry analysts publish about us, our business or our industry. We have limited, and may never obtain significant, research coverage by securities and industry analysts. If no additional securities or industry analysts commence coverage of our company, the trading price for our shares could be negatively affected. In the event we obtain additional securities or industry analyst coverage, if one or more of the analysts who covers us downgrades our stock, our share price will likely decline. If one or more of these analysts, or those who currently cover us, ceases to cover us or fails to publish regular reports on us, interest in the purchase of our shares could decrease, which could cause our stock price or trading volume to decline.

We may be classified as a passive foreign investment company for U.S. federal income tax purposes, which could subject U.S. investors in our ordinary shares to significant adverse U.S. federal income tax consequences.

A foreign corporation will be a passive foreign investment company for U.S. federal income tax purposes (a “PFIC”) in any taxable year in which, after taking into account the income and assets of the corporation and certain subsidiaries pursuant to applicable “look-through rules,” either (i) at least 75% of its gross income is “passive income,” or (ii) at least 50% of its assets produce or are held for the production of “passive income.” For this purpose, “passive income” generally includes dividends, interest, royalties and rents and certain other categories of income, subject to certain exceptions. We believe that we will not be a PFIC for the current taxable year and that we have not been a PFIC for prior taxable years and we expect that we will not become a PFIC in the foreseeable future, although there can be no assurance in this regard. The determination of whether we are a PFIC is a fact-intensive determination that includes ascertaining the fair market value (or, in certain circumstances, tax basis) of all of our assets on a quarterly basis and the character of each item of income we earn. This determination is made annually and cannot be completed until the close of a taxable year. It depends upon the portion of our assets (including goodwill) and income characterized as passive under the PFIC rules. Accordingly, it is possible that we may become a PFIC due to changes in our income or asset composition or a decline in the market value of our equity. Because PFIC status is a fact-intensive determination, no assurance can be given that we are not, have not been, or will not become, classified as a PFIC.

If we were to be classified as a PFIC in any taxable year, U.S. Holders (as defined in “Material Tax Consequences—Material U.S. Federal Income Tax Consequences”) generally would be subject to special tax rules that could result in materially adverse U.S. federal income tax consequences. Further, prospective investors should assume that a “qualified electing fund” election, which, if made, could serve as an alternative to the general PFIC rules and could reduce any adverse consequences to U.S. Holders if we were to be classified as a PFIC, will not be available because we do not intend to provide U.S. Holders with the information needed to make such an election. A mark-to-market election may be available, however, if our ordinary shares are regularly traded. For more information, see the section titled “Material Tax Consequences—Material U.S. Federal Income Tax Consequences—Passive Foreign Investment Company Consequences” and consult your tax advisor concerning the U.S. federal income tax consequences of acquiring, owning or disposing of our ordinary shares if we are or become classified as a PFIC.

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IMPORTANT INFORMATION AND CAUTIONARY STATEMENT REGARDING