ITEM 1.    BUSINESS

Overview

We are an established and growing private mortgage insurance company. Private mortgage insurance plays a critical role in the U.S. housing finance system. Essent and other private mortgage insurers provide credit protection to lenders and mortgage investors by covering a portion of the unpaid principal balance of a mortgage and certain related expenses in the event of a default. In doing so, we provide private capital to mitigate mortgage credit risk, allowing lenders to make additional mortgage financing available to prospective homeowners.

Private mortgage insurance helps extend affordable home ownership by facilitating the sale of low down payment loans into the secondary market. The GSEs purchase residential mortgages from banks and other lenders and guaranty mortgage-backed securities that are offered to investors in the secondary mortgage market. The GSEs, which are U.S. Federal government-sponsored enterprises, are restricted by their charters from purchasing or guaranteeing low down payment loans, defined as loans with less than a 20% down payment, that are not covered by certain credit protections. Private mortgage insurance satisfies the GSEs' credit protection requirements for low down payment loans, supporting a robust secondary mortgage market in the United States.

Our primary U.S. mortgage insurance subsidiary, Essent Guaranty, Inc., received its certificate of authority from the Pennsylvania Insurance Department in July 2009. We subsequently acquired our mortgage insurance platform from a former private mortgage insurance industry participant and, in 2010, became the first private mortgage insurer to be approved since 1995 by Fannie Mae and Freddie Mac, which we refer to collectively as the GSEs. We are licensed to write coverage in all 50 states and the District of Columbia.

For the years ended December 31, 2018 , 2017 and 2016 , we generated new insurance written, or NIW, of approximately $47.5 billion , $43.9 billion and $34.9 billion , respectively. As of December 31, 2018 , we had approximately $137.7 billion of insurance in force. Our top ten customers represented approximately 43.5% , 45.8% and 35.1% of our NIW on a flow basis for the years ended December 31, 2018 , 2017 and 2016 , respectively. The financial strength rating of our primary mortgage insurance subsidiary, Essent Guaranty, Inc., which we refer to as "Essent Guaranty," is Baa1 with a stable outlook by Moody's Investors Service and BBB+ with a stable outlook by S&P Global Ratings. On September 5, 2018, A.M. Best's Financial Strength Rating of A (Excellent) with a stable outlook was assigned to Essent Guaranty.

We also offer mortgage-related insurance and reinsurance through our wholly-owned Bermuda-based subsidiary, Essent Reinsurance Ltd., which we refer to as "Essent Re." As of December 31, 2018 , Essent Re provided insurance or reinsurance relating to the GSE risk share and other reinsurance transactions covering approximately $655.4 million of risk. Essent Re has also reinsured 25% of Essent Guaranty, Inc.'s GSE-eligible mortgage insurance NIW originated since July 1, 2014 under a quota share reinsurance agreement. The insurer financial strength rating of Essent Re is BBB+ with a stable outlook by S&P Global Ratings. On September 5, 2018, A.M. Best's Financial Strength Rating of A (Excellent) with a stable outlook was assigned to Essent Re.

Our holding company is domiciled in Bermuda and our U.S. insurance business is headquartered in Radnor, Pennsylvania. We operate additional underwriting and service centers in Winston-Salem, North Carolina and Irvine, California. We have a highly experienced, talented team of 385  employees as of December 31, 2018 .

Our Industry

U.S. Mortgage Market

The U.S. residential mortgage market is one of the largest in the world, with over $10.8 trillion of debt outstanding as of September 30, 2018 , and includes a range of private and government-sponsored participants. Private industry participants include mortgage banks, mortgage brokers, commercial, regional and investment banks, savings institutions, credit unions, REITs, mortgage insurers and other financial institutions. Public participants include government agencies such as the Federal

Housing Administration, or FHA, the Veterans Administration, or VA, the U.S. Department of Agriculture Rural Development program and the Government National Mortgage Association, or Ginnie Mae, as well as government-sponsored enterprises such as Fannie Mae and Freddie Mac. The overall U.S. residential mortgage market encompasses both primary and secondary markets. The primary market consists of lenders originating home loans to borrowers, and includes loans made to support home purchases, which are referred to as purchase originations, and loans made to refinance existing mortgages, which are referred to as refinancing originations. The secondary market includes institutions buying and selling mortgages in the form of whole loans or securitized assets, such as mortgage-backed securities.

GSEs

The GSEs are the largest participants in the secondary mortgage market, buying residential mortgages from banks and other primary lenders as part of their government mandate to provide liquidity and stability in the U.S. housing finance system. According to the Federal Reserve, the GSEs held or guaranteed approximately $4.8 trillion , or 44.2% , of total U.S. residential mortgage debt outstanding as of September 30, 2018 . Their charters generally prohibit the GSEs from purchasing a low down payment loan unless that loan is insured by a GSE-approved mortgage insurer, the mortgage seller retains at least a 10% participation in the loan or the seller agrees to repurchase or replace the loan in the event of a default. Historically, private mortgage insurance has been the preferred method utilized to meet this GSE charter requirement. As a result, the private mortgage insurance industry in the United States is driven in large part by the business practices and mortgage insurance requirements of the GSEs.

Mortgage Insurance

Mortgage insurance plays a critical role in the U.S. residential mortgage market by facilitating secondary market sales and by providing lenders and investors a means to diversify their exposures and mitigate mortgage credit risk. Mortgage insurance is provided by both private companies, such as Essent, and government agencies, such as the FHA and the VA. From 1999 through 2018 , an average of 24.0% of total annual mortgage origination volume utilized mortgage insurance.

Mortgage insurance industry volumes are influenced by total mortgage originations, and the mix between purchase and refinancing originations. Historically, mortgage insurance utilization has been meaningfully higher in purchase originations compared to refinancing originations. In 2018 , total U.S. residential mortgage origination volume was estimated at $1.64 trillion , comprised of $1.19 trillion of purchase originations and $458 billion of refinancing originations. In the years immediately following the 2007 - 2008 financial crisis, historically low interest rates and special refinance programs, such as the Home Affordable Refinance Program, or HARP, caused refinancing volume to significantly outpace purchase originations. Purchase originations, however, have accounted for an increasing percentage of the overall mortgage market in recent years as favorable housing market fundamentals have stimulated growth in home buying activity and a rising interest rate environment has slowed refinancing volume.

The following graph provides detail on trends in total residential mortgage originations and the breakdown of the market between purchase and refinancing volume.

Residential Purchase vs. Refinancing Mortgage Originations ($ in billions)

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Source:    Mortgage Bankers Association

Financial Crisis and Recovery

The severe economic and housing market dislocation experienced as a result of the 2007-2008 financial crisis had a profound impact on our industry. Incumbent insurers experienced record high claims activity and sustained significant financial losses, resulting in depleted capital positions. Three private mortgage insurers who wrote more than $125 billion of NIW in 2007, accounting for approximately 36% of total private mortgage insurance market NIW that year, have since exited the market, and several other insurers were forced, in the years following the crisis, to raise capital to repair their balance sheets and remain in operation. Although certain remaining incumbent insurers continue to deal with legacy, pre-crisis, challenges, improved housing market fundamentals and the high credit quality of post-crisis new business have, and we expect will continue to, support improved growth and profitability in the private mortgage insurance sector.

Prior to the financial crisis, private mortgage insurers accounted for the majority of the insured mortgage origination market. In 2007, private mortgage insurance represented 77.3% of insured mortgages and covered 15.5% of the total residential mortgage origination volume. As a result of the 2007 - 2008 financial crisis, government agencies began to insure an increasing percentage of the market as incumbent private insurers came under significant financial stress. By 2009, private mortgage insurance represented only 15.4% of the insured mortgage market and covered 4.1% of the total residential mortgage origination volume.

The private mortgage insurance industry, however, has more than doubled its share of the total insured market since 2009, leading to higher private mortgage insurance penetration of the total mortgage origination market. In 2018 , private mortgage insurance increased to an estimated 45% of the total insured market and covered 18% of the total mortgage origination volume. These gains have been driven in part by the improved financial position of incumbent insurers, the influx of private capital into the sector to support post-crisis entrants such as Essent, and aggregate increase since 2010 in the mortgage insurance premium rates and upfront fees charged for FHA insurance.

The charts below detail the relative share of the insured mortgage market covered by public and private participants, and historical NIW trends in the mortgage insurance market and private mortgage insurance penetration rates, which represents private mortgage insurance NIW to total U.S. residential mortgage origination volume.

Relative Share of Private and Public Mortgage Insurance

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Source:    Inside Mortgage Finance

Private mortgage insurance NIW ($ in billions)

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Source:    Inside Mortgage Finance, except for total originations for the purpose of calculating private mortgage insurance penetration, which is based on Mortgage Bankers Association. For 2011 through 2018, private mortgage insurance penetration includes private mortgage insurance NIW originated under HARP.

Competition

The private mortgage insurance industry is highly competitive. Private mortgage insurers generally compete on the basis of pricing, customer relationships, underwriting guidelines, terms and conditions, financial strength, reputation, the strength of management and field organizations, the effective use of technology, and innovation in the delivery and servicing of insurance products. The private mortgage insurance industry currently consists of six active private mortgage insurers, including Essent Guaranty and each of Arch Mortgage Insurance Company (which also acquired United Guaranty Corporation in 2016), Genworth Financial, Inc., Mortgage Guaranty Insurance Corporation, National Mortgage Insurance Corporation and Radian Guaranty Inc.

We and other private mortgage insurers compete directly with Federal and state governmental and quasi-governmental agencies that provide mortgage insurance, principally, the FHA and, to a lesser degree, the VA. As discussed above, the FHA's share of the mortgage insurance market increased as a result of the 2007 - 2008 financial crisis, and since 2009 has decreased as the private mortgage insurance industry has recovered and FHA premiums have increased in the aggregate. In addition to competition from the FHA and the VA, we and other private mortgage insurers currently face limited competition from state-sponsored mortgage insurance funds in several states, including California and New York. From time to time, other state legislatures and agencies consider expanding the authority of their state governments to insure residential mortgages.

Our industry also competes with products designed to eliminate the need for private mortgage insurance, such as "piggyback loans," which combine a first lien loan with a second lien in order to meet the 80% loan-to-value threshold required for sale to the GSEs without certain credit protections. In addition, we compete with investors willing to hold credit risk on their own balance sheets without credit enhancement and, in some markets, with alternative forms of credit enhancement such as structured finance products and derivatives.

Our Products and Services

Mortgage Insurance

In general, there are two principal types of private mortgage insurance, primary and pool.

Primary Mortgage Insurance

Primary mortgage insurance provides protection on individual loans at specified coverage percentages. Primary mortgage insurance is typically offered to customers on individual loans at the time of origination on a flow (i.e., loan-by-loan) basis, but can also be written in bulk transactions (in which each loan in a portfolio of loans is insured in a single transaction). A substantial majority of our policies are primary mortgage insurance.

Customers that purchase our primary mortgage insurance select a specific coverage level for each insured loan. To be eligible for purchase by a GSE, a low down payment loan must comply with the coverage percentages established by that GSE. For loans not sold to the GSEs, the customer determines its desired coverage percentage. Generally, our risk across all policies

written is approximately 25% of the underlying primary insurance in force, but may vary from policy to policy between 6% and 35% coverage.

We file our premium rates with the insurance departments of the 50 states and the District of Columbia as required. Premium rates cannot be changed after the issuance of coverage and premiums applicable to an individual loan are based on a broad spectrum of risk variables including coverage percentages, loan-to-value, or LTV, loan and property attributes, and borrower risk characteristics. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Factors Affecting Our Results of Operations—Net Premiums Written and Earned" and "—Key Performance Indicators—Average Net Premium Rate."

Premium payments for primary mortgage insurance coverage are typically made by the borrower. Mortgage insurance paid directly by the borrower is referred to as borrower-paid mortgage insurance, or "BPMI." If the borrower is not required to pay the premium, then the premium is paid by the lender, who may recover the premium through an increase in the note rate on the mortgage or higher origination fees. Loans for which premiums are paid by the lender are referred to as lender-paid mortgage insurance, or "LPMI." In either case, the payment of premium to us generally is the legal responsibility of the insured.

Premiums are generally calculated as a percentage of the original principal balance and may be paid as follows:

• monthly, where premiums are collected on a monthly basis over the life of the policy;

• in a single payment, where the entire premium is paid upfront at the time the mortgage loan is originated;

• annually, where premiums are paid in advance for the subsequent 12 months; or

• on a "split" basis, where an initial premium is paid upfront along with subsequent monthly payments.

As of December 31, 2018 , substantially all of our policies are monthly or single premium policies.

In general, we may not terminate mortgage insurance coverage except in the event there is non-payment of premiums or certain material violations of our mortgage insurance policies. The insured may cancel mortgage insurance coverage at any time at their option or upon mortgage repayment. GSE guidelines generally provide that a borrower meeting certain conditions may require the mortgage servicer to cancel mortgage insurance coverage upon the borrower's request when the principal balance of the loan is 80% or less of the property's current value. The Homeowners Protection Act of 1998, or HOPA, also requires the automatic termination of BPMI on most loans when the LTV ratio, based upon the original property value and amortized loan balance, reaches 78%, and provides for cancellation of BPMI upon a borrower's request when the LTV ratio, based on the current value of the property, reaches 80%, upon satisfaction of the conditions set forth in HOPA. See "—Regulation—Federal Mortgage—Related Laws and Regulations—Homeowners Protection Act of 1988" below. In addition, some states impose their own mortgage insurance notice and cancellation requirements on mortgage loan servicers.

The GSEs have implemented certain guidelines that may provide more flexibility to certain borrowers in cancelling mortgage insurance than is required for such loans under HOPA. For example, borrowers may request termination of mortgage insurance based on the current value of the property if certain loan-to-value and seasoning requirements are met and the borrower has an acceptable payment history. For loans seasoned between two and five years, the loan-to-value ratio must be 75% or less, and for loans seasoned more than five years, the loan-to-value ratio must be 80% or less. If the borrower has made substantial improvements to the property, the GSEs allow for cancellation once the loan-to-value ratio reaches 80% or less with no minimum seasoning requirement. In addition, GSE servicing guidelines currently require servicers to cancel BPMI on second homes with a 78% loan-to-value ratio, whereas HOPA applies to principal residences and excludes second homes.

In 2018, the GSEs announced changes to various mortgage insurance termination requirements that are intended to further simplify the process of evaluating borrower-initiated requests for mortgage insurance termination. Among other things, these changes update evidence of value requirements for borrower-requested cancellation based on the original value of the property and the current value of the property, raise Fannie Mae’s loan-to-value ratio for cancellation based on substantial improvements from 75% or less to 80% or less, provide clarification regarding what constitutes substantial improvements to the property, allow servicers to respond to either verbal or written requests for mortgage insurance cancellation by a borrower, and provide servicers flexibility in evaluating the payment history of borrowers that have been impacted by certain disaster events. Fannie Mae’s changes in this area must be implemented by March 1, 2019, although certain requirements have been implemented as early as January 1, 2019. Freddie Mac’s new requirements became effective on October 1, 2018.

 

Pool Insurance

Pool insurance is typically used to provide additional credit enhancement for certain secondary market and other mortgage transactions. Pool insurance generally covers the excess of the loss on a defaulted mortgage loan that exceeds the claim payment under the primary coverage, if such loan has primary coverage, as well as the total loss on a defaulted mortgage loan that did not have primary coverage. Pool insurance may have a stated aggregate loss limit for a pool of loans and may also have a deductible under which no losses are paid by the insurer until losses on the pool of loans exceed the deductible. In another variation, generally referred to as modified pool insurance, policies are structured to include an exposure limit for each individual loan as well as an aggregate loss limit or a deductible for the entire pool.

Master Policy

We issue a master policy to each customer approved as a counterparty by our risk department before accepting their applications for insurance. The master policy, along with its related endorsements and certificates, sets forth the general terms and conditions of our mortgage insurance coverage, including loan eligibility requirements, coverage terms, policy administration, premium payment obligations, exclusions or reductions in coverage, conditions precedent to payment of a claim, claim payment requirements, subrogation and other matters attendant to our coverage.

Mortgage insurance master policies generally protect mortgage insurers from the risk of material misrepresentations and fraud in the origination of an insured loan by establishing the right to rescind coverage in such event. Pursuant to the current minimum standards for mortgage insurer master policies, which we refer to as the "Rescission Relief Principles," instituted by the GSEs and the Federal Housing Finance Agency, or FHFA, master policies provide rescission relief for loans that remain current up to 36 months after origination and that have not experienced more than two late payments of 30 days or more and have never been 60 days late, and are permitted to provide rescission relief after 12 payments provided the mortgage insurer can independently validate the representations for which it provides rescission relief. The current Rescission Relief Principles require that the master policies reserve rescission rights with respect to fraud committed by the insured or those under its control and certain patterns of fraud.

The GSEs and the FHFA have adopted revised Rescission Relief Principles which require mortgage insurers to implement conforming master policies in 2019. The revised Rescission Relief Principles add requirements that rescission relief be provided for loans that are current after 60 payments and permit provision of rescission relief concurrent with independent validation of representations, including validation by use of duly approved automated tools. The revised Rescission Relief Principles also require that master policies reserve rescission rights with respect to fraud committed by any party in connection with the origination or closing of a loan or application for mortgage insurance (provided, however, that the exclusion for fraud by borrowers may be sunset after the borrower has made 12 timely payments) and certain patterns of fraud or data inaccuracies and permit the mortgage insurer to offer certain alternatives to rescission. See "Risk Factors—Risks Relating to Our Business— Changes in the business practices of the GSEs, including actions or decisions to decrease or discontinue the use of mortgage insurance or changes in the GSEs' eligibility requirements for mortgage insurers, could reduce our revenues or adversely affect our profitability and returns " elsewhere in this Annual Report and "—Regulation—Direct U.S. Regulation—GSE Qualified Mortgage Insurer Requirements" below.

Contract Underwriting

In addition to offering mortgage insurance, we provide contract underwriting services on a limited basis. As a part of these services, we assess whether data provided by the customer relating to a mortgage application complies with the customer's loan underwriting guidelines. These services are provided for loans that require private mortgage insurance, as well as for loans that do not require private mortgage insurance. Under the terms of our contract underwriting agreements with customers and subject to contractual limitations on liability, we agree to indemnify the customer against losses incurred in the event that we make an underwriting error which materially restricts or impairs the saleability of a loan, results in a material reduction in the value of a loan or results in the customer being required to repurchase a loan. The indemnification may be in the form of monetary or other remedies, subject to per loan and annual limitations. See "Risk Factors—Risks Relating to Our Business— We face risks associated with our contract underwriting business."

Bermuda-Based Insurance and Reinsurance

We offer mortgage-related insurance and reinsurance through Essent Re, a Class 3A insurance company licensed pursuant to Section 4 of the Bermuda Insurance Act 1978. Essent Re provides insurance or reinsurance relating to the GSE risk share and other reinsurance transactions. Essent Re also reinsures 25% of Essent Guaranty's GSE-eligible mortgage insurance NIW originated since July 1, 2014 under a quota share reinsurance agreement. Essent Re also provides underwriting consulting services to third-party reinsurers through its wholly-owned subsidiary, Essent Agency (Bermuda) Ltd. 

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Portfolio by Geography

Our in force portfolio is geographically diverse. As of December 31, 2018 , only three states accounted for greater than 5% of our portfolio and no single metropolitan statistical area accounted for greater than 3% of our portfolio, as measured by either IIF or Gross RIF. The following tables provide detail of the IIF and Gross RIF in our top ten most concentrated states and our top ten most concentrated U.S. metropolitan statistical areas as of December 31, 2018 and 2017 .

Customers

Our customers consist of originators of residential mortgage loans, such as regulated depository institutions, mortgage banks, credit unions and other lenders. We classify our customers into two broad categories and target our marketing efforts based on the customer's operating model and whether decisions to select a mortgage insurance provider are made centrally, or at the field or customer branch level:

We seek to maintain strong institutional relationships with all our customers. We provide them with ongoing risk, sales, training, service and product development support. We maintain regular and ongoing dialogue with our customers to develop an in-depth understanding of their strategies and needs, to share market perspectives and industry best practices, and to offer tailored solutions and training where necessary on a local level.

Our top ten customers generated 43.5% of our NIW on a flow basis during the year ended December 31, 2018 , compared to 45.8% and 35.1% for the years ended December 31, 2017 and 2016 , respectively. For the year ended December 31, 2018 , one customer, Quicken Loans Inc., exceeded 10% of our consolidated revenue. The loss of any of our larger customers could have a material adverse impact on us and our business. See "Risk Factors—Risks Relating to Our Business— Our revenues, profitability and returns would decline if we lose a significant customer ."

Sales and Marketing

Our sales and marketing efforts are designed to help us establish and maintain in-depth, quality customer relationships. We organize our sales and marketing efforts based on our centralized and decentralized customer segmentation, giving additional consideration to a customer's geographic location and whether its lending footprint is national or regional in nature.

We emphasize a collaborative approach with our customers that includes a number of educational offerings and joint product development and marketing initiatives:

We have an experienced team of national and regional account managers strategically deployed nationwide that markets our mortgage insurance products and support services.

We assign national account managers to each of the national lenders, providing a point of communication between us and the customer's senior management team. These professionals are responsible for the development and execution of sales and marketing strategies aimed at growing customer volumes and ensuring each customer's needs are understood and helping them to pursue their strategies. The national account managers also coordinate the direct communication of customers with our underwriting and risk management groups to provide a continual flow of information between the organizations.

We also have regional account managers and dedicated support staff operating in defined geographic regions. Our regional account managers play a similar role to our national account managers with respect to customer relationship management, education and customer training, serving as our primary point of contact for small and mid-sized regional lenders operating in a given territory. Regional account managers also support our national account team by assisting with our efforts to directly market and service the branch locations of certain national lenders.

We support our national and regional sales force, and improve their effectiveness in acquiring new customers, by raising our brand awareness through advertising and marketing campaigns, website enhancements, electronic communication strategies and sponsorship of industry and educational events.

We continue to build our sales force by hiring qualified mortgage professionals who generally have well-established relationships with industry-leading lenders and significant experience in both mortgage insurance and mortgage lending. Our approach is reflected in and supported by our compensation structure, pursuant to which we have successfully implemented a

non-commission-based structure that includes an equity ownership program, which we believe aligns their efforts with our long-term corporate objectives, including providing better customer service and better risk selection.

Information Technology

We have a highly automated business that relies on information technology. We accept insurance applications through electronic submission and issue electronic insurance approvals. In order to facilitate this process, we establish direct connections to the origination and servicing systems of our customers and servicers, which may require a significant upfront investment. We also provide our customers secure access to our web-based mortgage insurance ordering and servicing systems to facilitate transactions.

We continue to upgrade and enhance our systems and technology, including:

We believe that our technology, together with our information technology team, greatly enhances our operating efficiency and creates competitive advantages. Our team is experienced in large-scale project delivery, including mortgage insurance administration systems and the development of web-enabled servicing capabilities. Technology costs are managed by standardizing our technology infrastructure, consolidating application systems, managing project execution risks and using contract employees as needed.

Underwriting

We have established underwriting guidelines that we believe protect our balance sheet and result in the insurance of high quality business. Most applications for mortgage insurance are submitted to us electronically, and we rely upon the lender's representations and warranties that the data submitted is true and correct when making our insurance decision. Our underwriting guidelines incorporate credit eligibility requirements that, among other things, restrict our coverage to mortgages that meet our requirements with respect to borrower FICO scores, maximum debt-to-income levels, maximum LTV ratios and documentation requirements. Our underwriting guidelines also limit the coverage we provide for mortgages made with certain high risk features, including those for cash-out refinance, second homes or investment properties.

We regularly seek to enhance our underwriting guidelines through extensive data gathering, detailed loan level risk analysis, and assessments of trends in key macroeconomic factors such as housing prices, interest rates and employment. We utilize proprietary models that enable us to assess individual loan risks with a high degree of granularity and set pricing for our policies within a risk-adjusted return framework. See "—Risk Management" below. We have adopted a balanced underwriting approach, which considers our risk analysis, return objectives and market factors.

At present, our underwriting guidelines are broadly consistent with those of the GSEs. Many of our customers use the GSEs' automated loan underwriting systems, Desktop Underwriter® and Loan Prospector®, for making credit determinations. We accept the underwriting decisions made by the GSEs' underwriting systems, subject to certain additional limitations and requirements. We monitor the GSEs for updates to these systems, and may engage in a deeper review for the more substantive releases. Our reviews may result in the maintenance or implementation of additional eligibility requirements. In addition, the performance results of loans scored via automated underwriting systems are monitored within our portfolio management protocols.

Our primary mortgage insurance policies are issued through one of two programs:

We maintain primary underwriting centers in Radnor, Pennsylvania, Winston-Salem, North Carolina and Irvine, California. We believe that the geographical distribution of our underwriting staff allows us to make underwriting determinations across different time zones and to best serve customers across the United States. Although our employees conduct the substantial majority of our non-delegated underwriting, we engage underwriters on an outsourced basis from time to time in order to provide temporary underwriting capacity.

Risk Management

We have established risk management controls throughout our organization and have a risk management framework that we believe reduces the volatility of our financial results and capital position. The risk committee of our board of directors has formal oversight responsibility for the risks associated with our business and is supported by a management risk committee, chaired by our Chief Risk Officer, comprised of senior members of our executive management team.

We believe that our risk management framework encompasses all of the major risks we face, including our mortgage insurance portfolio, investment risk, liquidity risk and regulatory compliance risk, among others. The majority of our risk analysis is directed toward the risks embedded in our mortgage insurance portfolio. As such, we have established a risk management approach that analyzes the risk across the full life cycle of a mortgage, into what we term the "loan life cycle."

Loan Life Cycle Risk Management

We generally break down the loan life cycle risk management process into three components:

Customer qualification involves a process in which we diligence a potential customer's financial resources, operational practices, management experience and track record of originating quality mortgages prior to formalizing a customer relationship. We leverage the experience of our management team to pre-screen lenders prior to formally engaging and performing a lender qualification review. Once engaged, our counterparty risk management team conducts a lender qualification review with oversight from the management risk committee. Approved lenders are subject to clear parameters regarding underwriting delegation status, credit guideline requirements and variances and collateral thresholds and volume mix expectations for loan diversification.

The policy acquisition process involves the establishment of underwriting guidelines, pricing schedules and aggregate risk limits. See "—Underwriting" above. These guidelines and schedules are coded in our credit risk rule engine which is utilized to screen each loan underwritten, and are constructed to ensure prudent risk acquisition with adequate return on capital. These guidelines and schedules are maintained and periodically reviewed by our risk management team and adjusted to reflect the most current risk assessment based on ongoing experience in the insurance portfolio as well as industry loan quality trends.

The portfolio management process involves two main functions, quality assurance, or QA, reviews, and a comprehensive surveillance protocol, in order to provide customers timely feedback that fosters high quality loan production. Through our QA process, we review a statistically significant sample of individual mortgages from our customers to ensure that the loans accepted through our underwriting process meet our pre-determined eligibility and underwriting criteria. The QA process allows us to identify trends in lender underwriting and origination practices, as well as to back-test underlying reasons for delinquencies, defaults and claims within our portfolio. The information gathered from the QA process is incorporated into our policy acquisition function and is intended to prevent continued aggregation of underperforming risks. Our surveillance protocol maintains oversight over customer and vendor activities, industry dynamics, production trends and portfolio performance. The portfolio management process also involves loss mitigation aimed to reduce both frequency and severity of non-performing risk. See "—Defaults and Claims" below.

Modeling and Analytics

Our risk management professionals are supported by substantial data analysis and sophisticated risk models. We have a dedicated modeling and analytics team which is responsible for delivering actionable models, tools, analysis and reporting to inform our credit underwriting and pricing decisions. The team analyzes mortgage, financial, economic and housing data to develop proprietary behavioral models that help us assess credit, prepayment and loss severity trends and collateral valuation models to help inform business decisions. Performance and profitability are evaluated across customers and products to identify the emergence of potential weaknesses and adverse risks. Geographic housing market analysis also is utilized in establishing market restrictions for certain products and segments. We utilize an economic capital framework to evaluate risk-adjusted returns. We also perform stress tests on our portfolio to analyze how our book of business may perform under adverse scenarios. We believe that our economic capital framework and stress testing analysis helps to inform our optimal capitalization targets, allowing us to prudently manage and protect our balance sheet.

Defaults and Claims

Defaults

The default and claim cycle for a mortgage insurance policy begins with receipt of a default notice from the servicer. We consider a loan to be in default when we are notified by the servicer that the borrower has missed at least two consecutive monthly payments. Defaults may occur for a variety of reasons including death or illness, divorce or other family problems, unemployment, changes in economic conditions, declines in property values that cause the outstanding mortgage amount to exceed the value of a home or other events.

We expect servicers to make timely collection efforts on borrowers who have defaulted, and to attempt to restore the defaulted mortgage, and our mortgage insurance coverage, to current status. If the servicer cannot restore a borrower to current status, the servicer may be able to offer the borrower a forbearance or loan modification alternatives. Where these alternatives cannot cure the default, the servicer is responsible for pursuing remedies for the default, including foreclosure or acceptable foreclosure alternatives, certain of which, such as short sales and deeds in lieu of foreclosure, require our prior approval under the terms of our master policy. We have delegated certain authority to the GSEs and their servicers to exercise some of these alternatives. Among other requirements, servicers operate under protocols established by the GSEs. See "Risk Factors—Risks Relating to Our Business— If servicers fail to adhere to appropriate servicing standards or experience disruptions to their businesses, our losses could unexpectedly increase ."

The following table shows the number of primary insured loans and the percentage of loans insured by us that are in default as of December 31, 2018 and 2017 :