SUMMARY

The following summary highlights certain information contained elsewhere in this prospectus and is qualified in its entirety by the more detailed information and consolidated financial statements included elsewhere in this prospectus. Because this is a summary, it may not contain all of the information that is important to you in making a decision to invest in our ordinary shares. Before making an investment decision, you should carefully read the entire prospectus, including the “Risk Factors” and “Important Information and Cautionary Statement Regarding Forward-Looking Statements” sections, our audited combined and consolidated financial statements and the notes to those statements.

Unless the context indicates otherwise, when we refer to “we,” “our,” “us,” “successor” and “the Company” for purposes of this prospectus, we are referring to Constellium N.V. and its consolidated subsidiaries. We refer to volumes for the nine month period ended September 30, 2013 as “nine-month 2013 volumes”.

On January 4, 2011, Omega Holdco B.V., which later changed its name to Constellium Holdco B.V., and then again to Constellium N.V., acquired the Alcan Engineered Aluminum Products business unit (the “AEP Business” or the “Predecessor”) from affiliates of Rio Tinto (the “Acquisition”). For comparison purposes, our results of operations for the years ended December 31, 2011 and 2012 and for the nine months ended September 30, 2012 and 2013 are presented alongside the results of operations of the Predecessor for the year ended December 31, 2010. However, our Successor and Predecessor periods are not directly comparable due to the impact of the application of purchase accounting and the preparation of the Predecessor accounts on a carve-out basis. The financial position, results of operations and cash flows of the Predecessor do not necessarily reflect what our financial position or results of operations would have been if we had been operated as a standalone entity during the periods covered by the Predecessor financial statements and are not indicative of our future results of operations and financial position.

Management Adjusted EBITDA and Adjusted EBITDA are defined and discussed in footnotes (2) and (3) to the “Summary Consolidated Historical Financial Data.” Management Adjusted EBITDA is defined and discussed in “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Key Performance Indicators.” Adjusted EBITDA is defined and discussed in “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Covenant Compliance and Financial Ratios.”

The Company

Overview

We are a global leader in the design and manufacture of a broad range of innovative specialty rolled and extruded aluminum products, serving primarily the aerospace, packaging and automotive end-markets. We have a strategic footprint of manufacturing facilities located in the United States, Europe and China. Our business model is to add value by converting aluminum into semi-fabricated products. We believe we are the supplier of choice to numerous blue-chip customers for many value-added products with performance-critical applications. Our product portfolio commands higher margins as compared to less differentiated, more commoditized fabricated aluminum products, such as common alloy coils, paintstock, foilstock and soft alloys for construction and distribution.

As of December 31, 2013, we operate 23 production facilities, 10 administrative and commercial sites and one research and development (“R&D”) center and have approximately 8,600 employees. We believe our portfolio of flexible and integrated facilities is among the most technologically advanced in the industry. It is our view that our established presence in the United States and Europe and our growing presence in China strategically position us to service our global customer base. For example, based on information available to us as a market participant, we believe we are one of only two suppliers of aluminum products to the aerospace

market with facilities in both the United States and Europe. We believe this gives us a key competitive advantage in servicing the needs of our aerospace customers, including Airbus S.A.S. and The Boeing Company. We believe our well-invested facilities combined with more than 50 years of manufacturing experience, quality and innovation and pre-eminent R&D capabilities have put us in a leadership position in our core markets.

We seek to sell to end-markets that have attractive characteristics for aluminum, including (i) higher margin products, (ii) stability through economic cycles and (iii) favorable growth fundamentals, such as customer order backlogs in aerospace and substitution trends in automotive and European can sheet. We are the leading global supplier of aluminum aerospace plates, the leading European supplier of can body stock and a leading global supplier of automotive structures. Our unique platform has enabled us to develop a stable and diversified customer base and to enjoy long-standing relationships with our largest customers. Our relationships with our top 20 customers average over 25 years. Our customer base includes market leading firms in aerospace, packaging, and automotive including Airbus, Boeing, Rexam PLC, Ball Corporation, Crown Holdings, Inc., and several premium automotive original equipment manufacturers, or OEMs, including BMW AG, Mercedes-Benz and Volkswagen AG. We believe that we are a “mission critical” supplier to many of our customers due to our technological and R&D capabilities as well as the lengthy and complex qualification process required for many of our products. Our core products require close collaboration and, in many instances, joint development with our customers.

For the years ended December 31, 2012, 2011 and 2010, we shipped approximately 1,033 kt, 1,058 kt and 972 kt of finished products, generated revenues of €3,610 million, €3,556 million and €2,957 million, generated profits of €134 million and incurred losses of €174 million and €207 million for the periods, respectively, and generated Adjusted EBITDA of €228 million, €160 million and €48 million, respectively. For the nine months ended September 30, 2013 and 2012, we shipped 791 kt and 798 kt of finished products, generated revenues of €2,689 million and €2,796 million, generated profits of €67 million and €85 million and generated Adjusted EBITDA of €221 million and €181 million, respectively. The financial performance for the year ended December 31, 2012 represented a 2% decrease in shipments, a 2% increase in revenues and a 43% increase in Adjusted EBITDA from the prior year. The financial performance for the nine months ended September 30, 2013 represented a 1% decrease in shipments, a 4% decrease in revenues and a 22% increase in Adjusted EBITDA in comparison to the nine months ended September 30, 2012. Please see the reconciliation of Adjusted EBITDA in “Management’s Discussion and Analysis—Management Adjusted EBITDA Reconciliation” and footnote (3) to “Summary Consolidated Historical Financial Data.”

Our Operating Segments

Our business is organized into three operating segments: (i) Aerospace & Transportation, (ii) Packaging & Automotive Rolled Products, and (iii) Automotive Structures & Industry.

The following charts present our revenues by operating segment and geography for the nine months ended September 30, 2013:

Aerospace & Transportation Operating Segment (“A&T”)

Our Aerospace & Transportation operating segment has market leadership positions in technologically advanced aluminum and specialty materials products with wide applications across the global aerospace, defense, transportation, and industrial sectors. We offer a wide range of products including plate, sheet, extrusions and precision casting products which allows us to offer tailored solutions to our customers. We seek to differentiate our products and act as a key partner to our customers through our broad product range, advanced R&D capabilities, extensive recycling capabilities and portfolio of plants with an extensive range of capabilities across North America and Europe. In order to reinforce the competitiveness of our metal solutions, we design our processes and alloys with a view to optimizing our customers’ operations and costs. This includes offering services such as customizing alloys to our customers’ processing requirements, processing short lead time orders and providing vendor managed inventories or tolling arrangements. The Aerospace & Transportation operating segment accounted for 33% of our revenues and 45% of Management Adjusted EBITDA for the year ended December 31, 2012 and 34% of our revenues and 43% of Management Adjusted EBITDA for the nine months ended September 30, 2013.

Eight of our manufacturing facilities produce products that are sold via our Aerospace & Transportation operating segment. Our aerospace plate manufacturing facilities in Ravenswood (West Virginia, United States), Issoire (France) and Sierre (Switzerland) offer the full spectrum of plate required by the aerospace industries (alloys, temper, dimensions, pre-machined) and have unique capabilities such as producing some wide and very high gauge plates required for some aerospace programs (civil and commercial). Sierre is in the process of becoming a new qualified aerospace heat treat plate mill. A step in this process was successfully achieved with the agreement in February 2013 by one of the largest commercial aircraft manufacturers to authorize Sierre to become a rolling and heat treat subcontractor of Issoire. We expect Sierre to become a fully qualified source for aerospace plate in 2015.

Downstream aluminum products for the aerospace market require relatively high levels of R&D investment and advanced technological capabilities, and therefore tend to command higher margins compared to more

commoditized products. We work in close collaboration with our customers to develop highly engineered solutions to fulfill their specific requirements. For example, we developed AIRWARE ^® , a lightweight specialty aluminum-lithium alloy, for our aerospace customers to address demand for lighter and more environmentally sound aircraft; it combines optimized density, corrosion resistance and strength in order to achieve up to 25% weight reduction compared to other aluminum products and significantly higher corrosion and fatigue resistance than equivalent composite products. In addition, unlike composite products, any scrap produced in the AIRWARE ^® manufacturing process can be fully recycled, which reduces production costs. Since the opening of our AIRWARE ^® casthouse in Issoire, we are the first company to commercialize and produce AIRWARE ^® on an industrial scale, and the material is currently being used on a number of major aircraft models, including the newest Airbus A350 XWB aircraft, the fuselage of Bombardier’s single-aisle twinjet C-Series short-haul planes, the Airbus A380 and the Boeing 787 Dreamliner. Our customer base includes Airbus, Boeing, Embraer, Dassault, Bombardier and Lockheed Martin.

Aerospace products are typically subject to long qualification, development and supply lead times and the majority of our contracts with our largest aerospace customers have a term of five years or longer, which provides excellent volume and profitability visibility. In addition, demand for our aerospace products typically correlates directly with aircraft backlogs and build rates. As of August 2013, the backlog reported by Airbus and Boeing for commercial aircraft reached 9,935 units on a combined basis, representing approximately eight years of production at current build rates.

The following table summarizes our volume, revenues, Management Adjusted EBITDA and Adjusted EBITDA for our Aerospace & Transportation operating segment for the periods presented:

Packaging & Automotive Rolled Products Operating Segment (“P&ARP”)

In our Packaging & Automotive Rolled Products operating segment, we produce and develop customized aluminum sheet and coil solutions. Approximately 83% of operating segment volume for the nine months ended September 30, 2013 was in packaging applications, which primarily include beverage and food can stock, as well

as closure stock and foil stock. The remaining 17% of operating segment volume for that period was in automotive and customized solutions, which include technologically advanced products for the automotive and industrial sectors. Our Packaging & Automotive Rolled Products operating segment accounted for 43% of revenues and 39% of Management Adjusted EBITDA for the year ended December 31, 2012 and 43% of our revenues and 34% of Management Adjusted EBITDA for the nine months ended September 30, 2013.

We are the leading European supplier of can body stock and the leading worldwide supplier of closure stock. We are also a major European player in automotive rolled products for Auto Body Sheet (the structural framework of a car) and heat exchangers. We have a diverse customer base, consisting of many of the world’s largest beverage and food can manufacturers, specialty packaging producers, leading automotive firms and global industrial companies. Our customer base includes Rexam PLC, Audi AG, Daimler AG, Peugeot S.A., Ball Corporation, Can-Pack S.A., Crown Holdings, Inc., Alanod GmbH & Co. KG, Ardagh Group S.A., Amcor Ltd. and ThyssenKrupp AG.

We have two integrated rolling operations located in Europe’s industrial heartland. Neuf-Brisach, our facility on the border of France and Germany, is, in our view, a uniquely integrated aluminum rolling and finishing facility. Singen, located in Germany, is specialized in high-margin niche applications and has an integrated hot/cold rolling line and high-grade cold mills with special surfaces capabilities that facilitate unique metallurgy and lower production costs. We believe Singen has enhanced our reputation in many product areas, most notably in the area of functional high-gloss surfaces for the automotive, lighting, solar and cosmetic industries, other decorative applications, closure stock, paintstock and foilstock.

Our Packaging & Automotive Rolled Products operating segment has historically been relatively resilient during periods of economic downturn and has had relatively limited exposure to economic cycles and periods of financial instability. According to CRU, during the 2008-2009 economic crisis, can stock volumes decreased by 10% in 2009 versus 2007 levels as compared to a 24% decline for flat rolled aluminum products volumes in aggregate during the same period. This demonstrates that demand for beverage cans tends to be less correlated with general economic cycles. In addition, we believe European can body stock has an attractive long-term growth outlook due to the following trends: (i) end-market growth in beer, soft drinks and energy drinks, (ii) increasing use of cans versus glass in the beer market, (iii) increasing use of aluminum in can body stock in the European market, at the expense of steel, and (iv) increasing consumption in eastern Europe linked to purchasing power growth.

The following table summarizes our volume, revenues, Management Adjusted EBITDA and Adjusted EBITDA for our Packaging & Automotive Rolled Products operating segment for the periods presented:

Automotive Structures & Industry Operating Segment (“AS&I”)

Our Automotive Structures & Industry operating segment produces (i) technologically advanced structures for the automotive industry including crash management systems, side impact beams and cockpit carriers and (ii) soft and hard alloy extrusions and large profiles for automotive, rail, road, energy, building and industrial applications. We complement our products with a comprehensive offering of downstream technology and services, which include pre-machining, surface treatment, R&D and technical support services. Our Automotive Structures & Industry operating segment accounted for 24% of revenues and 20% of Management Adjusted EBITDA for the year ended December 31, 2012 and 23% of our revenues and 21% of Management Adjusted EBITDA for the nine months ended September 30, 2013.

We believe that we are the second largest provider of automotive structures in the world and the leading supplier of hard alloys and large profiles for industrial and other transportation markets in Europe. We manufacture automotive structures products for some of the largest European and North American car manufacturers supplying a global market, including Daimler AG, BMW AG, Audi AG, Chrysler Group LLC and Ford Motor Co. We also have a strong presence in soft alloys in France and Germany, with customized solutions for a diversity of end-markets.

Fifteen of our manufacturing facilities, located in Germany, the United States, the Czech Republic, Slovakia, France, Switzerland and China, produce products sold in our Automotive Structures & Industry operating segment. We believe our local presence, downstream services and industry leading cycle times help to ensure that we respond to our customer demands in a timely and consistent fashion. Our two integrated remelt and casting centers in Switzerland and the Czech Republic both provide security of metal supply and contribute to our recycling efforts.

The following table summarizes our volume, revenues, Management Adjusted EBITDA and Segment Adjusted EBITDA for our Automotive Structures & Industry operating segment for the periods presented:

Holdings and Corporate

Our Holdings and Corporate segment includes the net cost of our head offices in Schiphol-Rijk, the Netherlands, our treasury center in Zurich and our corporate support services functions in Paris. Our Holdings and Corporate segment accounted for 0% of revenues, (4%) of Management Adjusted EBITDA and (7%) of Adjusted EBITDA for the year ended December 31, 2012 and 1% of revenues, 2% of Management Adjusted EBITDA and 0% of Adjusted EBITDA for the nine months ended September 30, 2013. Our Management Adjusted EBITDA and Adjusted EBITDA is defined and discussed in “Management’s Discussion and Analysis of Financial Condition and Results of operations—Key Performance Indicators—Management Adjusted EBITDA” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Management Adjusted EBITDA Reconciliation,” respectively.

Voreppe Research & Development Center

Voreppe is our dedicated R&D center in Grenoble, France and, as of December 31, 2013, employs approximately 85 scientists and 90 technicians. Voreppe uses its full-scale facilities, which include a pilot casthouse that enables process and alloy development on an industrial scale, and external links with several universities and other research facilities to develop new solutions and meet customers’ needs. Our scientists and technicians are active in the development of aluminum product metallurgy and casting, rolling and extrusion technologies. Voreppe’s proven track record includes development of an intellectual property portfolio with approximately 900 active patents organized into over 150 patent families.

We believe that a major factor in our R&D success has been the close interaction with key customers in our most technically demanding markets at the early stages of the development and innovation process. This collaborative effort with long-term customers has led to the in-house development of advanced alloys and solutions that have applications for products sold to multiple end-markets. This collaboration often takes the form of formal partnership or co-development arrangements or the formation of joint teams with our customers.

An example of such a development is our Surfalex ^® alloy, which was developed for the demanding specifications of the auto body market. We believe the alloy’s superior surface appearance combined with high mechanical resistance level and optimized formability make it an alloy of choice for this sector. This alloy is already used at premium OEM’s like Audi, Porsche and Daimler.

Our Industry

The specialty metals industry is comprised of producers of a variety of high performance metals and semi-fabricated products manufactured from those metals, which include stainless steel and titanium in addition to aluminum. We also compete with producers of other materials that can be used in our target end-markets, such as composites in aerospace or copper in certain automotive applications, as well as traditional carbon steel in automotive and packaging. Aluminum is lightweight, has a high strength-to-weight ratio and is resistant to

corrosion. It compares favorably to several alternative materials, such as steel, in these respects. Aluminum is also unique in the respect that it can also be recycled repeatedly without any material decline in performance or quality. The recycling of aluminum delivers energy and capital investment savings relative to the cost of producing both primary aluminum and many other competing materials. Due to these qualities, the penetration of aluminum into a wide variety of applications continues to increase. We believe that long-term growth in aluminum consumption generally, and demand for those products we produce specifically, will be supported by factors that include growing populations, continued urbanization in emerging markets and increasing focus globally on sustainability and environmental issues. Aluminum is increasingly seen as the material of choice in a number of applications, including aerospace, packaging and automotive.

The following charts illustrate expected global demand for aluminum extruded and rolled products. The expected growth through 2018 for the extruded products market and the flat rolled products market is 5.8% and 5.4%, respectively.

Projected Aluminum Demand 2013-2018 (in thousand metric tons)

The global aluminum industry consists of (i) mining companies that produce bauxite, the ore from which aluminum is ultimately derived, (ii) primary aluminum producers that refine bauxite into alumina and smelt alumina into aluminum, (iii) aluminum semi-fabricated products manufacturers, including aluminum casters, recyclers, extruders and flat rolled products producers (such as Constellium) and (iv) integrated companies that are present across multiple stages of the aluminum production chain.

The price of aluminum, quoted on the London Metal Exchange (which we refer to in this prospectus as “LME”), is subject to global supply and demand dynamics and moves independently of the costs of many of its inputs. Producers of primary aluminum have limited ability to manage the volatility of aluminum prices and can experience a high degree of volatility in their cash flows and profitability. We do not smelt aluminum, nor do we participate in other upstream activities such as mining or refining bauxite. We recycle aluminum, both for our own use and as a service to our customers.

Rolled and extruded aluminum product prices are generally based on price of metal plus a conversion fee ( i.e. , the cost incurred to convert the aluminum into its semi-finished product). The price of aluminum is not a significant driver of our financial performance, in contrast to the more direct relationship of the price of aluminum to the financial performance of primary aluminum producers. Instead, the financial performance of producers of rolled and extruded aluminum products, such as Constellium, is driven by the dynamics in the end-markets that they serve, their relative positioning in those markets and the efficiency of their industrial operations.

Our Competitive Strengths

We believe that the following competitive strengths differentiate our business and will allow us to maintain and build upon our strong industry position:

Leading positions in each of our attractive and complementary end-markets

In our core industries—aerospace, packaging and automotive—we have market leading positions and established relationships with many of the main manufacturers. Within these attractive and diverse end-markets, we are particularly focused on product lines that require expertise, advanced R&D, and technology capabilities to produce. The drivers of demand in our core industries are varied and largely unrelated to one another.

We are the largest supplier globally of aerospace plates. We believe that our ability to fulfill the technical, R&D and quality requirements needed to supply the aerospace market gives us a significant competitive advantage. In addition, based on our knowledge as a market participant, we are one of only two suppliers of aerospace plate to have qualified facilities on two continents, which enables us to more effectively supply both Airbus and Boeing. We have sought to develop our strategic platform by making significant investments to increase our capacity and improve our capabilities and to develop our proprietary AIRWARE ^® material solution. We believe we are well-positioned to benefit from strong demand in the aerospace sector, as demonstrated by the currently high backlogs for Boeing and Airbus that are driven by increased global demand for air travel, especially in Asia.

We are the largest supplier of European can body stock by volume with approximately 35% of the market in 2012 and, in our view, we have benefited from our strong relationships with the leading European can manufacturers, our recycling capabilities and our fully integrated Neuf-Brisach facility, which has full production capabilities ranging from recycling and casting to rolling and finishing. As the leader in the European market, we believe that we are well-positioned to benefit from the ongoing trend of steel being replaced by aluminum as the material of choice for can sheet. Packaging provides a stable cash flow stream through the economic cycle that can be used to invest in attractive opportunities in the aerospace and automotive industries to drive longer-term growth.

In automotive, we believe our leading positions in the supply of aluminum products are due to our advanced design capabilities, efficient production systems and established relationships with leading automotive OEMs. This includes being the second largest global supplier of auto crash management systems by volume. We expect that E.U. and U.S. regulations requiring reductions in carbon emissions and fuel efficiency, as well as relatively high fuel prices, will continue to drive aluminum demand in the automotive industry. Whereas growth in aluminum use in vehicles has historically been driven by increased use of aluminum castings, we anticipate that future growth will be primarily in the kinds of extruded and rolled products that we supply to the OEMs.

In addition, we hold market leading positions in a number of other attractive product lines.

Advanced R&D and technological capabilities

We have made substantial investments to develop unique R&D and technological capabilities, which we believe give us a competitive advantage as a supplier of the high value-added, specialty products on which we focus and which make up the majority of our product portfolio. In particular, our R&D facility in Voreppe, France has given us a leading position in the development of proprietary next-generation specialty alloys, as evidenced by our robust intellectual property portfolio. We use our technological capabilities to develop tailored products in close partnerships with our customers, with the aim of building long-term and synergistic relationships.

One of our hallmark R&D achievements was the recent development of AIRWARE ^® , a lightweight specialty aluminum-lithium alloy developed for our aerospace customers to enable them to reduce fuel consumption and costs. AIRWARE ^® was developed for certain customers using our pilot cast-house in Voreppe, and following a substantial capital expenditure investment, is now being produced on an industrial scale in our aerospace facility in Issoire, France. AIRWARE ^® combines optimized density, corrosion resistance and strength in order to achieve up to 25% weight reduction compared to other aluminum products and significantly higher corrosion and fatigue resistance than equivalent composite products. This technology drives incremental margin compared to tradition aluminum alloys.

Global network of efficient facilities with a broad range of capabilities operated by a highly skilled workforce

We operate a network of strategically located facilities that we believe allows us to compete effectively in our selected end-markets across numerous geographies. With an estimated replacement value of over €6.5 billion without inventories, our facilities have enabled us to reliably produce a broad range of high-quality products. They are operated by a highly skilled workforce with decades of accumulated operational experience. We believe this collective knowledge base would be very difficult to replicate and is a key contributing factor to our ability to produce consistently high-quality products.

Our six key production sites feature industry-leading manufacturing capabilities with required industry qualifications that are, in our view, difficult for market outsiders to accomplish. For example, we believe that Neuf-Brisach is the most integrated downstream aluminum production facility in Europe, with capabilities spanning the recycling, casting, rolling and finishing phases of production. In July 2013, we completed two projects to enhance the capacity and performance of one of our main rolling mills at Neuf-Brisach, representing a total investment of €23 million. The first project modernized a casting complex dedicated to rolling slab production, delivering safety and quality improvements and increasing casting capacity, and the second project involved the complete replacement of a pusher furnace, dedicated to the homogenization and preheating of slabs before rolling. Our Issoire, France and Ravenswood, West Virginia, United States plants have unique capabilities for producing the specialized wide and very high gauge plates required for the aerospace sector. We spent €20 million in the two-year period ended December 31, 2012 at Ravenswood, mainly to complete significant equipment upgrades, including a hot mill and new stretcher that we believe is the most powerful stretcher in our industry. Additionally, our network of small extrusion and automotive structures plants enables us to serve many of our customers on a localized basis, allowing us to more rapidly meet demand through close proximity. We believe our portfolio of facilities provides us with a strong platform to retain and grow our global customer base.

Long-standing relationships with a diversified and blue-chip customer base

Our customer base includes some of the largest manufacturers in the aerospace, packaging and automotive end-markets. We believe that our ability to produce tailored, high value-added products fosters longer-term and synergistic relationships with this blue-chip customer base. We regard our relationships with our customers as partnerships in which we work together to utilize our unique R&D and technological capabilities to develop customized solutions to meet evolving requirements. This includes developing products together through long-term R&D partnerships. In addition, we collaborate with our customers to complete a rigorous process for qualifying our products, which requires substantial time and investment and creates high switching costs.

We have a relatively diverse customer base with our 10 largest customers representing approximately 47% of our revenues and approximately 51% of our volumes for the nine months ended September 30, 2013. The average length of our relationships with our top 20 customers exceeds 25 years, and in some cases goes back as far as 40 years, particularly with our aerospace and packaging customers. Most of our major aerospace, packaging and automotive customers have multi-year contracts with us ( i.e. , contracts with terms of three to five years), making us critical partners to our customers. As a result, we estimate that approximately 53% of our nine-months 2013 volumes are generated under multi-year contracts, with more than 50% of nine-month 2013 volumes governed by contracts valid until 2014 or later, more than 40% of nine-month 2013 volumes governed by contracts valid until 2015 or later, and more than 36% of nine-month 2013 volumes governed by contracts valid until 2016 or later. We believe this provides us with stability and significant visibility into our future volumes and earnings.

Stable business model that delivers robust free cash flow across the cycle

There are several ways in which our business model is designed to produce stable and consistent cash flows and profitability. For example, we seek to limit our exposure to commodity metal price volatility primarily by utilizing pass-through mechanisms or contractual arrangements and financial derivatives.

Our business also features relatively countercyclical cash flows. During an economic downturn, lower demand causes our sales volumes to decrease, which results in a corresponding reduction in our inventory purchases and a reduction in our working capital requirements. As a result, operating cash flows become positive. We believe this helps to drive robust free cash flow across cycles and provides significant downside protection for our liquidity position in the event of a downturn. For example, in 2009 during the last prolonged downturn in demand, our volumes declined from 1,058 kt to 868 kt. This decline resulted in a €276 million reduction of our total working capital, mainly driven by inventory purchases reductions of €213 million and a positive operating cash flow from continuing operations of €181 million.

In addition, we have a significant presence in what have proved to be relatively stable, recession-resilient end-markets with 47% of volumes in the year ended December 31, 2012 sold into the can sheet and packaging end-markets, and 9% of volumes in that period sold into the aerospace end-market, which is driven by global demand trends rather than regional trends. Our automotive products are predominantly used in premium models manufactured by the German OEMs, which are not as dependent on the European economy and continue to benefit from rising demand in developing economies, particularly China.

We are also focused on optimizing the cost efficiency of our operations. In 2010, we implemented a rigorous continuous improvement program with the annual goal of outperforming inflation in our non-metal cost base (labor, energy, maintenance) and lowering our breakeven level. As a result of this program, we reduced our costs by €49 million in 2010, €67 million in 2011 and €57 million in 2012.

Strong and experienced management team

We have a strong and experienced management team led by Pierre Vareille, our Chief Executive Officer, who has more than 30 years of experience in the manufacturing industry and a successful track record of leading global manufacturing companies, particularly in the domain of metal transformation for industries such as aerospace and automotive. Both Mr. Vareille and our Chief Financial Officer, Didier Fontaine, have previously been involved in the management of public companies. Our executive officers and other key members of our management team have an average of more than 15 years of relevant industry experience. Our team has expertise across the commercial, technical and management aspects of our business and industry, which provides for strong customer service, rigorous quality and cost controls, and focus on health, safety and environmental improvements. Our board of directors includes current and former executives of Alcan, Rio Tinto, Bosch, Ascometal SAS, Alcatel-Lucent, Continental AG, Kaiser Aluminum and automotive suppliers such as Faurecia, who bring extensive experience in operations, finance, governance and corporate strategy.

Our Business Strategies

Our objective is to expand our leading position as a supplier of high value-added, technologically advanced products in which we believe that we have a competitive advantage. Our strategy to achieve this objective has three pillars: (i) selective participation, (ii) global leadership position and (iii) best-in-class efficiency and operational performance.

Selective Participation

Continue to target investment in high-return opportunities in our core markets (aerospace, packaging and automotive), with the goal of driving growth and profitability

We are focused on our three strategic end-markets—aerospace, packaging and automotive—which we believe have attractive growth prospects for aluminum. These are also markets where we believe that we can differentiate ourselves through our high value-added products, our strong customer relationships and our R&D and technological capabilities. Our capital expenditures and R&D spend are focused on these three strategic end-

markets and are made in response to specific volume requirements from long-term customer contracts, which ensures relatively short payback periods and good visibility into return on investment. Examples of this focused approach include a new casthouse at Issoire to support growing demand for AIRWARE ^® , a new state-of-the-art press at Singen to increase capacity for automotive extrusions and a heat treatment and conversion line at Neuf-Brisach to serve growing demand for aluminum automotive sheet.

As part of our focus on our core end-markets and our strategy to improve our profitability, we also consider potential divestitures of non-strategic businesses. For example, we divested the vast majority of our Alcan International Network (“AIN”) specialty chemicals and raw materials supply chain services division in 2011 to CellMark AB. In each of 2011 and 2012, the discontinued operations of our AIN business generated losses of €8 million. More recently, in May 2013, we announced the sale of our French extrusion plants in Ham and Saint-Florentin to OpenGate Capital, which were dedicated to the production of aluminum profiles intended mainly for the building and construction industry.

Focus on higher margin, technologically advanced products that facilitate long-term relationships as a “mission critical” supplier to our customers

Our product portfolio is predominantly focused on high value-added products, which we believe we are particularly well-suited to developing and manufacturing for our customers. These products tend to require close collaboration with our customers to develop tailored solutions, as well as significant effort and investment to adhere to rigorous qualification procedures, which enables us to foster long-term relationships with our customers. Our products typically command higher margins than more commoditized products, and are supplied to end-markets that we believe have highly attractive characteristics and long-term growth trends.

Global Leadership Position

Continue to differentiate our products, with the goal of maintaining our leading market positions and remaining a supplier of choice to our customers

We aim to deepen our ties with our customers by consistently providing best-in-class quality, market leading supply chain integration, joint product development projects, customer technical support and scrap and recycling solutions. We believe that our product offering is differentiated by our market leading R&D capabilities. Our key R&D programs are focused on high growth and high margin areas such as specialty material solutions, next generation alloys and sustainable engineered solutions / manufacturing technologies. Recent examples of market leading breakthroughs include our AIRWARE ^® lithium alloy technology and our Solar Surface ^® Selfclean, a coating solution used in the solar industry which provides additional performance and functionality of the aluminum by chemically breaking down dirt and contaminants in contact with the surface.

Build a global footprint with a focus on expansion in Asia, particularly in China, and work to gain scale through acquisitions in Europe and the United States

We intend to selectively expand our global operations where we see opportunities to enhance our manufacturing capabilities, grow with current customers and gain new customers, or penetrate higher-growth regions. We believe disciplined expansion focused on these objectives will allow us to achieve attractive returns for our shareholders. In line with these principles, our recent expansions include:

Best-in-Class Performance

Contain our fixed costs and offset inflation with increased productivity

We have been executing an extensive cost savings program focusing on selling, general and administrative expenses (“SG&A”), conversion costs and purchasing. In 2010, 2011 and 2012, we realized a structural realignment of our cost structure and achieved annual costs savings of €49, €67, and €57 million, respectively. This represents approximately 4% of our estimated addressable cost base in 2012 ( i.e. , excluding raw material cost). These savings are split between operating expenses (48%), SG&A savings (21%) and procurement savings (31%). This program was designed to right-size our cost structure, increase our profitability and provide a competitive advantage against our peers. Our cost savings program will continue to be a priority as we focus on optimizing our cost base and offsetting inflation.

Establish best-in-class operations through Lean manufacturing

We believe that there are significant opportunities to improve our services and quality and to reduce our manufacturing costs by implementing Lean manufacturing initiatives. “Lean manufacturing” is a production practice that improves efficiency of operations by identifying and removing tasks and process steps that do not contribute to value creation for the end customer. We continually evaluate debottlenecking opportunities globally through modifications of, and investments in, existing equipment and processes. We aim to establish best-in-class operations and achieve cost reductions by standardizing manufacturing processes and the associated upstream and downstream production elements where possible, while still allowing the flexibility to respond to local market demands and volatility.

To focus our efforts, we have launched a Lean manufacturing program that is designed to improve the flow of value to customers by eliminating waste in both processes and resources. We measure operational success of this program in six key areas: (i) safety, (ii) quality, (iii) acceleration of the flows and working capital reduction, (iv) delivery performance, (v) equipment efficiency and (vi) innovation.

Our Lean manufacturing program is overseen by a dedicated team, headed by Yves Mérel. Mr. Mérel reports directly to our Chief Executive Officer, Pierre Vareille. Mr. Vareille and Mr. Mérel have long track records of successfully implementing Lean manufacturing programs at other companies they have managed together in the past.

Recent Developments

Expected Results

We are currently in the process of finalizing our financial results for the three months and twelve months ended December 31, 2013. Based on preliminary unaudited information for the three months ended December 31, 2013, our total shipment volumes are expected to be approximately 234kt in comparison to 235kt for the three months ended December 31, 2012. The disposal of our Ham and Saint-Florentin plants in France earlier in 2013 together with lower volumes within our packaging business were offset by higher automotive volumes and higher volumes in our Aerospace and Transportation segment. We estimate that our revenues for the three months ended December 31, 2013 will be approximately €802 million to €812 million. This would represent a decrease of approximately 0% - 2%, when compared to €814 million for the three months ended December 31, 2012. Excluding the volumes and revenues of our Ham and Saint-Florentin plants from the same period in the prior fiscal year, our volumes are expected to increase by 5kt, or 2%, and revenues are expected to increase by between 1% and 3% compared with last year.

Our A&T segment volumes and revenue are expected to grow by 15% and approximately 11%, respectively in the three months ended December 31, 2013, compared with the three months ended December 31, 2012, due to higher sales in both the aerospace and transportation sectors. We saw lower volumes and revenues in our

P&ARP segment with lower sales to the packaging sector being partly offset by higher auto body sheet volumes and revenue. Our AS&I segment volumes and revenue declined primarily due to the disposal of our Ham and Saint-Florentin plants. Excluding the results of these plants from the same period in the prior fiscal year, AS&I volumes and revenues are expected to increase by 11% for the three months ended December 31, 2013, compared with the three months ended December 31, 2012. This reflects higher sales of large profiles and extruded products for the automotive industry.

Management Adjusted EBITDA for the three months ended December 31, 2013, is expected to be in the range of €39 million to €45 million, and Adjusted EBITDA is expected to be in the range of €56 million to €62 million. This would represent a change in Management Adjusted EBITDA of approximately 0% to 15% from €40 million for the three months ended December 31, 2012 and an increase in Adjusted EBITDA of 27% to 41% from €44 million for the three months ended December 31, 2012. These increases in the three months ended December 31, 2013 reflect the combined enhancement of our product mix, higher sales to the aerospace and automotive markets and the continued benefit from the cost and productivity improvements achieved, partially offset by the limited impact of work stoppages at two of our French plants.

We expect our income before income taxes for the three months ended December 31, 2013 will be in the range of €18 million to €36 million, in comparison to €67 million for the three months ended December 31, 2012. This change reflects the inclusion in the three months ended December 31, 2012 of one-time events, including a gain of €48 million in respect of the Ravenswood pension plan amendments.

Our revenue for the twelve months ended December 31, 2013 is expected to be approximately €3,491 to €3,501 million, a decrease of 3% in comparison to our revenues for the twelve months ended December 31, 2012 of €3,610 million. Management Adjusted EBITDA and Adjusted EBITDA are expected to be approximately €226 million to €232 million and €277 million to €283 million, respectively, for the twelve months ended December 31, 2013, representing an increase in Management Adjusted EBITDA of between 11% and 14% and an increase in Adjusted EBITDA of between 21% and 24% for the twelve months ended December 31, 2013. The increase reflects mainly improved sales to both the aerospace and automotive sectors together with the production and cost efficiency measures undertaken at our major locations. Income before income taxes for the twelve months ended December 31, 2013 is expected to be between €124 million and €142 million.

We expect our net debt as at December 31, 2013 to be approximately €132 million in comparison to net debt as at September 30, 2013 of €181 million. This movement reflects the net cash generation of the business during the quarter ended December 31, 2013.

The following table reconciles our estimated income before income taxes for the three months and twelve months ended December 31 to our Management Adjusted EBITDA and Adjusted EBITDA:

Management Adjusted EBITDA and Adjusted EBITDA are not measures defined by IFRS. For definitions of Management Adjusted EBITDA and Adjusted EBITDA and the reasons why management believes the inclusion of such measures is useful to provide additional information to investors about our performance, see footnotes (2) and (3) of “Summary Consolidated Historical Financial Data.”

We have provided ranges for our preliminary results described above because our financial closing procedures for the three months and twelve months ended December 31, 2013 are not yet complete. We currently expect that our final results will be within the ranges described above. However, these estimates are preliminary, and are based on, and represent the most current information available to management as of the date of this prospectus. Therefore, it is possible that our actual financial results may differ materially from these estimates as we undergo the completion of our financial closing procedures, make final adjustments and consider other developments which may arise between now and the time we finalize our financial results for the three months and twelve months ended December 31, 2013.

Accordingly, you should not place undue reliance on these preliminary estimates. The preliminary unaudited financial data for the three months and twelve months ended December 31, 2013 included in this prospectus have been prepared by, and are the responsibility of, our management and have not been reviewed or audited or subject to any other procedures by our independent registered public accounting firm. Accordingly, our independent registered public accounting firm does not express an opinion or any other form of assurance with respect to the preliminary unaudited financial data.

Multi-year Boeing Contract

On November 21, 2013, we announced that we have been awarded a multi-year agreement with The Boeing Company to support all of The Boeing Company’s leading commercial airplane programs. With this agreement,

we will increase both the scope and range of products we supply. Under the new agreement, we will supply Boeing aluminum products for airframes utilizing our current and advanced-generation aluminum alloys. The products will be supplied from our two major A&T manufacturing sites in Ravenswood, WV and in Issoire, France.

Body-in-White Investment

On January 15, 2014, we announced that we plan to invest up to €200 million over the next three years to further grow our European Body-in-White business. Our investment is expected to run from 2014 through the end of 2016. In Phase 1, we plan to increase production capacity at our Neuf-Brisach facility in France and start Body-in-White production at our Singen facility in Germany by revamping its continuous annealing line. By 2016, we expect to add up to 40,000 metric tons to our current capacity with the first BiW coils produced in Singen expected to be as early as mid-2014. In Phase 2, we plan to add a new continuous annealing and conversion line in Europe with a targeted capacity of 100,000 metric tons, with the aim to start commissioning in the second half of 2016.

Body-in-White Joint Venture

On January 23, 2014, we announced that Constellium and UACJ Corporation (“UACJ”), through Tri-Arrows Aluminum Inc. (TAA) (UACJ’s subsidiary with Sumitomo Corporation and Itochu Group), intend to create a joint venture company in the United States, as an equal partnership, to serve the North American market. The joint venture, in which Constellium expected to own 51% of the equity, is expected to include a continuous heat treatment and conversion line with an initial target capacity of 100,000 metric tons supplied by cold rolled coils from both partners’ rolling mills. The planned facility is designed to allow for expansion beyond 100,000 tons. The total joint investment by both parties is expected to amount to approximately $150 million. Constellium and UACJ are working to finalize definitive documentation regarding the joint venture by the end of the second quarter 2014. Until such time as definitive agreements are executed, there can be no guarantee that the parties will engage in the joint venture.

Corporate History and Information

Constellium Holdco B.V. (formerly known as Omega Holdco B.V.) was incorporated as a Dutch private limited liability company on May 14, 2010. Constellium Holdco B.V. was formed to serve as the holding company for various entities comprising the Alcan Engineered Aluminum Products business unit (the “AEP Business”), which it acquired from affiliates of Rio Tinto on January 4, 2011.

Our principal shareholders are investment funds affiliated with, or co-investment vehicles that are managed (or the general partners of which are managed) by subsidiaries of, Apollo Global Management, LLC (Apollo Global Management, LLC and its subsidiaries collectively, or any one of such entities individually, “Apollo”), a leading global alternative investment manager and Bpifrance Participations (f/k/a Fonds Stratégique d’Investissements), a société anonyme incorporated under the laws of the Republic of France, which is a French public investment fund specializing in the business of equity financing via direct investments or fund of funds (“Bpifrance”). Bpifrance is a wholly-owned subsidiary of BPI-Groupe (bpifrance), a French financial institution jointly owned and controlled by the Caisse des Dépôts et Consignations, a French special public entity ( établissement special ) and EPIC BPI-Groupe, a French public institution of industrial and commercial nature. As used in this prospectus, the term “Apollo Funds” means investment funds affiliated with, or co-investment vehicles that are managed (or the general partners of which are managed) by, Apollo; the term “Rio Tinto” refers to Rio Tinto or an affiliate of Rio Tinto, a leading international mining group, combining Rio Tinto plc, a London listed public company headquartered in the United Kingdom, and Rio Tinto Limited, which is listed on the Australian Stock Exchange, with executive offices in Melbourne (the two companies are joined in a dual listed

companies (“DLC”) structure as a single economic entity, called the Rio Tinto Group; and the term “Bpifrance” means Bpifrance Participations (f/k/a Fonds Stratégique d’Investissements) or other entities affiliated with Bpifrance.

On December 30, 2011, we disposed of substantially all of our interests in AIN, our specialty chemicals and raw materials supply chain services division, to CellMark AB. The remaining entities have ceased operations.

On March 28, 2013, we made a distribution of share premium to our Class A and Class B1 shareholders of €103 million (and an additional distribution to our class B2 shareholders of €392,000 on May 21, 2013).

Our board of directors further approved a distribution of profits of an additional €147 million to our existing Class A, Class B1 and Class B2 shareholders. Due to certain European tax and accounting restrictions, however, we did not anticipate being able to pay such additional distribution to such shareholders until after the completion of the initial public offering. Consequentially, in order to facilitate the payment of such distribution, we issued preference shares to our existing pre-IPO Class A, Class B1 and Class B2 shareholders. These preference shares entitled them to receive distributions in priority to ordinary shareholders in the aggregate amount of €147 million in proportion to their percentage immediately prior to the completion of the initial public offering. We were able to make such distribution of €147 million on May 21, 2013 and the preference shares were acquired by the Company for no consideration on May 29, 2013. Our Amended and Restated Articles of Association and Dutch law provide that so long as the preference shares are held by the Company, they will have no voting rights and no right to profits.

On May 16, 2013, we effected a pro rata share issuance of Class A ordinary shares, Class B1 ordinary shares and Class B2 ordinary shares to our existing shareholders, which we implemented through the issuance of 22.8 new Class A ordinary shares, 22.8 Class B1 ordinary shares and 22.8 Class B2 ordinary shares for each outstanding Class A, Class B1 and Class B2 ordinary share, respectively. As a result, the Company issued an aggregate amount of 83,945,965 additional Class A ordinary shares, 815,252 additional Class B1 ordinary shares and 923,683 additional Class B2 ordinary shares, nominal value €0.02 per share, prior to consummation of the initial public offering. The pro rata share issuance was undertaken in order to provide an appropriate per-share valuation in respect of the offering price for our initial public offering.

On May 21, 2013, Constellium Holdco B.V. was converted into a Dutch public limited liability company and renamed Constellium N.V. Any references to Dutch law and the Amended and Restated Articles of Association are references to Dutch law and the articles of association of the Company as applicable following the conversion.

On May 29, 2013, we completed our initial public offering of 22,222,222 of our ordinary shares at a price to the public of $15.00 per share. A total of 13,333,333 shares were offered by us and a total of 8,888,889 shares were offered by Apollo Funds and Rio Tinto. On June 24, 2013, the underwriters of our initial public offering exercised their over-allotment option to purchase from us an additional 2,251,306 Class A ordinary shares at a public offering price of $15.00 per share less the underwriting discount. The exercise of the over-allotment option brought the total number of Class A ordinary shares sold in the initial public offering to 24,473,528.

In connection with our initial public offering, Apollo Funds and Rio Tinto entered into an agreement with Bpifrance pursuant to which Bpifrance agreed to place an order to purchase approximately 4.4 million ordinary shares at a per share price equal to the public offering price (the “Bpifrance share purchase”). Apollo Funds and Rio Tinto agreed to use best efforts to cause the underwriters to allocate such number of shares to Bpifrance. The agreement further provides that for one year following the closing of our initial public offering, Bpifrance is restricted from buying additional shares in the Company unless this restriction is waived by both Apollo Funds and Rio Tinto or certain specified events occur.

On November 14, 2013, we completed a secondary public offering of 17,500,000 of our ordinary shares at a price to the public of $17.00 per share. The shares were offered by Rio Tinto and Omega Management GmbH & Co. KG (“Management KG”). On November 8, 2013, the underwriters of this secondary public offering

exercised their option to purchase from Rio Tinto an additional 2,625,000 Class A ordinary shares at a public offering price of $17.00 per share less the underwriting discount. The exercise of the purchase option brought the total number of Class A ordinary shares sold in the secondary public offering to 20,125,000.

On December 16, 2013, we completed a secondary public offering of 8,345,713 of our ordinary shares at a price to the public of $19.80 per share. The shares were offered by Rio Tinto. On December 12, 2013, the underwriter of this secondary public offering exercised its option to purchase from Rio Tinto an additional 1,251,847 Class A ordinary shares at a public offering price of $19.80 per share less the underwriting discount. The exercise of the purchase option brought the total number of Class A ordinary shares sold in the secondary public offering to 9,597,560.