FORM S-11
FOR REGISTRATION
UNDER
THE SECURITIES ACT OF 1933
OF CERTAIN REAL ESTATE COMPANIES

Western Asset Mortgage Capital Corporation
(Exact name of registrant as specified in its governing instruments)

Western Asset Mortgage Capital Corporation
385 East Colorado Boulevard
Pasadena, California 91101
(626) 844-9400
(Address, including Zip Code, and Telephone Number, including Area Code, of Registrant's Principal Executive Offices)

Charles A. Ruys de Perez
c/o Western Asset Management Company
385 East Colorado Boulevard
Pasadena, California 91101
(626) 844-9400
(Name, Address, including Zip Code, and Telephone Number, including Area Code, of Agent for Service)

David J. Goldschmidt, Esq.
Skadden, Arps, Slate, Meagher & Flom LLP
Four Times Square
New York, New York 10036
Tel (212) 735-3574
Fax (917) 777-3574

Approximate date of commencement of proposed sale to the public:
As soon as practicable after the effective date of this registration statement.

If any of the Securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act, check the following box: o

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

If delivery of the prospectus is expected to be made pursuant to Rule 434, check the following box. o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act. (Check One):

The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until the Registration Statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

The information in this preliminary prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is declared effective. This preliminary prospectus is not an offer to sell these securities and we are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

Western Asset Mortgage Capital Corporation is a Delaware corporation focused on investing in, financing and managing primarily Agency RMBS, which are residential mortgage-backed securities for which the principal and interest payments are guaranteed by a U.S. Government agency, such as the Government National Mortgage Association, or a U.S. Government-sponsored entity, such as the Federal National Mortgage Association or the Federal Home Loan Mortgage Corporation. Although our core investment strategy is focused on Agency RMBS, we opportunistically supplement our portfolio with residential mortgage-backed securities that are not guaranteed by a U.S. Government agency or sponsored entity, commercial mortgage-backed securities and other asset-backed securities. We are externally managed and advised by Western Asset Management Company, an investment advisor registered with the Securities and Exchange Commission. We are offering shares of our common stock, par value $0.01 per share, as described in this prospectus. Our common stock is listed on the New York Stock Exchange under the symbol "WMC." On April 16, 2013, the last reported price of our common stock was $22.00 per share.

We intend to elect and qualify to be taxed as a real estate investment trust for U.S. federal income tax purposes, commencing with our taxable year ended December 31, 2012. To assist us in qualifying as a real estate investment trust, stockholders are generally restricted from owning more than 9.8% by value or number of shares, whichever is more restrictive, of our outstanding shares of common or capital stock. Our amended and restated certificate of incorporation contains various other restrictions on the ownership and transfer of our common stock. See "Description of Capital stock—Restrictions on ownership and transfer of our capital stock."

We are an "emerging growth company" as that term is used in the Jumpstart Our Business Startups Act of 2012, or the JOBS Act.

Investing in our common stock involves risks. See "Risk factors" beginning on page 6 of this prospectus for a discussion of the following and other risks.

The underwriters may also purchase up to an additional shares of our common stock from us at the initial public offering price, less the underwriting discount, within 30 days after the date of this prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

You should rely only on the information contained in this prospectus, including the documents incorporated by reference into this prospectus or in any free writing prospectus. We have not, and the underwriters have not, authorized any other person to provide you with different or additional information. If anyone provides you with different or additional information, you should not rely on it. We are not, and the underwriters are not, making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus and any free writing prospectus prepared by us is accurate only as of their respective dates or on the date or dates which are specified in these documents. Our business, financial condition, liquidity, results of operations and prospects may have changed since those dates.

Summary

This summary highlights some of the information in this prospectus. It does not contain all of the information that you should consider before investing in our common stock. You should read carefully the more detailed information set forth under "Risk Factors" and the other information included or incorporated by reference in this prospectus and the information set forth under the caption "Where you can find more information". Except where the context suggests otherwise, the terms "company," "we," "us," and "our" refer to Western Asset Mortgage Capital Corporation, a Delaware corporation. Unless indicated otherwise, the information in this prospectus assumes no exercise by the underwriters of their option to purchase up to an additional shares of our common stock.

Our Company

We are organized as a Delaware corporation focused on investing in, financing and managing primarily residential mortgage-backed securities, or RMBS, for which the principal and interest payments are guaranteed by a U.S. Government agency, such as the Government National Mortgage Association, or GNMA, or a U.S. Government-sponsored entity, including the Federal National Mortgage Association, or FNMA, and the Federal Home Loan Mortgage Corporation, or FHLMC. We refer to these types of securities as Agency RMBS. Although our core investment strategy is focused on Agency RMBS, we opportunistically supplement our portfolio with RMBS that are not guaranteed by a U.S. Government agency or U.S. Government-sponsored entity, or non-Agency RMBS, and in the future we may opportunistically supplement our portfolio with commercial mortgage-backed securities, or CMBS, and other asset-backed securities, or ABS. We refer to these assets as additional target assets. We finance our investments in Agency RMBS and additional target assets primarily through the use of repurchase agreements.

Our objective is to provide attractive risk-adjusted returns to our investors over the long term, primarily through dividends and secondarily through capital appreciation without sacrificing capital preservation. In pursuing this objective, we rely on our Manager's expertise to construct and manage a diversified mortgage investment portfolio by identifying asset classes that, when properly financed and hedged, are designed to produce attractive returns across a variety of market conditions and economic cycles, while considering the risks associated with owning such investments.

We are externally managed and advised by Western Asset Management Company, or our Manager, an investment advisor registered with the U.S. Securities and Exchange Commission, or the SEC. Our Manager is responsible for administering our business activities and day-to-day operations, subject to the supervision and oversight of our board of directors.

We were organized as a Delaware corporation on June 3, 2009. We commenced operations on May 15, 2012 following the completion of our initial public offering, or IPO, and two concurrent private placements.

We intend to elect and qualify to be taxed as a real estate investment trust, or REIT, for U.S. federal income tax purposes, commencing with our taxable year ended December 31, 2012. We generally will not be subject to U.S. federal income taxes on our taxable income to the extent that we annually distribute all of our net taxable income to stockholders and maintain our intended qualification as a REIT. We also operate our business in a manner that permits us to maintain our exemption from registration under the Investment Company Act of 1940, or the 1940 Act.

Summary risk factors

An investment in shares of our common stock involves various risks. You should consider carefully the risks discussed below and under the heading "Risk Factors" beginning on page 6, and in the documents incorporated by reference herein before purchasing our common stock. If any of the following risks occurs, our business, financial condition or results of operations could be materially and adversely affected. In that case, the trading price of our common stock could decline and you may lose some or all of your investment.

•: We have a limited operating history and may not be able to successfully operate our business or generate sufficient revenue to make or sustain distributions to our stockholders.
•: We are dependent on our Manager and its key personnel for our success.
•: There are conflicts of interest in our relationship with our Manager that could result in decisions that are not in the best interests of our stockholders.
•: Our Manager's management fee is payable regardless of our performance.
•: We may change any of our strategies, policies or procedures without stockholder consent.
•: We have not yet identified any specific investments we may make with the net proceeds of this offering.
•: We may pay distributions from offering proceeds, borrowings or the sale of assets to the extent that distributions exceed earnings or cash flow from our operations.
•: We operate in a highly competitive market for investment opportunities and competition may limit our ability to acquire desirable investments in Agency RMBS and our additional target assets and could also affect the pricing of these securities.
•: A lack of liquidity in our investments may adversely affect our business.
•: Adverse developments in the broader residential mortgage market may adversely affect the value of the assets in which we invest.
•: The mortgage loans underlying the non-Agency RMBS and the CMBS we may acquire will be subject to defaults, foreclosure, timeline extension, fraud and residential/commercial price depreciation and unfavorable modification of loan principal amount, interest rate and amortization of principal, which could result in losses to us.
•: We may be affected by deficiencies in foreclosure practices of third parties, as well as related delays in the foreclosure process.
•: Most of our investments are recorded at fair value, and quoted prices or observable inputs may not be available to determine such value, resulting in the use of significant unobservable inputs to determine value.
•: Declines in value of the assets in which we invest will adversely affect our financial position and results of operations, and make it more costly to finance these assets.
•: Changes in prepayment rates may adversely affect our profitability.
•: Loss of our exemption from regulation pursuant to the 1940 Act would adversely affect us.
•: Our strategy involves significant leverage, which may amplify losses.
•: The federal conservatorship of FNMA and FHLMC and related efforts, along with any changes in laws and regulations affecting the relationship between these agencies and the U.S. Government, may adversely affect our business.

•: Mortgage loan modification and refinancing programs and future legislative action may adversely affect the value of, and our returns on, Agency RMBS and our additional target assets.
•: We are subject to the risk that U.S. Government agencies and/or U.S. Government-sponsored entities may not be able to fully satisfy their guarantees of Agency RMBS or that these guarantee obligations may be repudiated, which may adversely affect the value of our assets and our ability to sell or finance these securities.
•: If a counterparty to our repurchase transactions defaults on its obligation to resell the underlying security back to us at the end of the transaction term, or if the value of the underlying security has declined as of the end of that term, or if we default on our obligations under the repurchase agreement, we will lose money on our repurchase transactions.
•: Failure to procure adequate repurchase agreement financing, which generally have short terms, or to renew or replace repurchase agreement financing as it matures, would adversely affect our results of operations.
•: An increase in our borrowing costs relative to the interest that we receive on investments in Agency RMBS and our additional target assets may adversely affect our profitability and cash available for distribution to our stockholders.
•: Hedging against interest rate exposure may adversely affect our earnings, which could reduce our cash available for distribution to our stockholders.
•: Our Manager has limited experience operating a REIT and we cannot assure you that our Manager's past experience will be sufficient to successfully manage our business as a REIT.
•: Our board of directors has approved very broad investment guidelines for our Manager and does not approve each investment and financing decision made by our Manager.
•: The management agreement with our Manager was not negotiated on an arm's-length basis and may not be as favorable to us as if it had been negotiated with an unaffiliated third party and may be costly and difficult to terminate.
•: The dilutive effect of our outstanding warrants, including in certain circumstances, upon the issuance of common stock in this offering as well as future issuances of our common stock, could have an adverse effect on the future market price of our common stock or otherwise adversely affect the interests of our common stockholders.
•: If we do not qualify as a REIT or if we fail to remain qualified as a REIT, we will be subject to tax as a regular corporation and could face a substantial tax liability, which would reduce the amount of cash available for distribution to our stockholders.
•: Complying with REIT requirements may cause us to forgo otherwise attractive opportunities.
•: We have identified a material weakness in our internal control over financial reporting which, if not remediated, may adversely affect our ability to provide timely and accurate financial reporting.

Our corporate information

Our principal executive offices are located at 385 East Colorado Boulevard, Pasadena, California 91101. Our telephone number is (626) 844-9400. Our website is www.westernassetmcc.com. The contents of our website are not a part of this prospectus. The information on our website is not intended to form a part of or be incorporated by reference into this prospectus.

The Offering


Common stock offered by us		shares (plus up to an additional shares of our common stock that we may issue and sell upon the exercise of the underwriters' option to purchase up to an additional shares).
Common stock to be outstanding after this offering		shares.
Use of proceeds		In this offering, we are offering shares of our common stock at $ per share. Assuming no shares are issued pursuant to the underwriters' option to purchase up to an additional shares, this offering would result in gross proceeds of $ million to us. We currently estimate the expenses attributable to this offering to be $ million. Therefore, we estimate that our aggregate net proceeds from this offering will be $ million, after deducting our estimated offering expenses (or $ million, if the underwriters exercise their option to purchase up to an additional shares in full).
		We plan to use the net proceeds from this offering to purchase Agency RMBS and our additional target assets, focusing predominantly on Agency RMBS.
		Until appropriate investments can be identified, our Manager may invest these proceeds in interest-bearing short-term investments, including money market accounts and/or funds, that are consistent with our intention to qualify as a REIT and maintain exemption from registration under the 1940 Act. These initial investments, if any, are expected to provide a lower net return than we seek to achieve from investments in Agency RMBS and our additional target assets. We anticipate that we will be able to identify a sufficient amount of Agency RMBS and our additional target assets within approximately one to two months after the closing of this offering. However, depending on the availability of appropriate investment opportunities and subject to prevailing market conditions, there can be no assurance that we will be able to identify a sufficient amount of investments within this timeframe. See "Use of Proceeds."
New York Stock Exchange symbol		"WMC"


Ownership and transfer restrictions		To assist us in complying with limitations on the concentration of ownership of a REIT imposed by the Internal Revenue Code of 1986, as amended, or the Internal Revenue Code, among other purposes, our amended and restated certificate of incorporation generally prohibits, among other prohibitions, any stockholder from beneficially or constructively owning more than 9.8% by value or number of shares, whichever is more restrictive, of our outstanding shares of common stock, or 9.8% by value or number of shares, whichever is more restrictive, of our outstanding capital stock. See "Description of Capital Stock—Restrictions on ownership and transfer of our capital stock."
Risk factors		Investing in our common stock involves a high degree of risk. You should carefully read and consider the information set forth under the heading "Risk Factors" beginning on page 6 of this prospectus and in the documents incorporated by reference into this prospectus before investing in our common stock.

Investing in our common stock involves a high degree of risk. You should carefully consider the all of the risks described in the section entitled "Risk Factors" in our Annual Report on Form 10-K for the period from May 15, 2012 (commencement of operations) through December 31, 2012, which is incorporated by reference herein, as well as the other information contained or incorporated by reference into this prospectus before purchasing our common stock. If any of these risks occur, our business, financial condition or results of operations could be materially and adversely affected. In that case, the trading price of our common stock could decline, and you may lose some or all of your investment. See "Where You Can Find More Information" and "Incorporation of Certain Documents by Reference." In connection with the forward-looking statements that appear in this prospectus, you should also carefully review the cautionary statements in the section of this prospectus entitled "Forward-Looking Statements."

We believe that some of the information in this prospectus an the documents incorporated by reference constitutes forward-looking statements within the definition of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are subject to risks and uncertainties. They include information about possible or assumed future results of our business, financial condition, liquidity, results of operations, plans and objectives. When we use the words "believe," "expect," "anticipate," "estimate," "plan," "continue," "intend," "should," "may" or similar expressions, we intend to identify forward-looking statements. Statements regarding the following subjects, among others, may be forward-looking:

The forward-looking statements are based on our beliefs, assumptions and expectations of our future performance, taking into account all information currently available to us. You should not place undue reliance on these forward-looking statements. These beliefs, assumptions and expectations can change as a result of many possible events or factors, not all of which are known to us. Some of these factors are described in this prospectus under the headings "Summary" and "Risk Factors," and incorporated by reference herein. If a change occurs, our business, financial condition, liquidity and results of operations may vary materially from those expressed in our forward-looking statements. Any forward-looking statement speaks only as of the date on which it is made. New risks and uncertainties arise over time, and it is not possible for us to predict those events or how they may affect us. Except as required by law, we are not obligated to, and do not intend to, update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Fair values for our securities are dependent upon a number of market-based assumptions including future interest rates, prepayment rates, discount rates, credit loss rates, and the timing of credit losses.

In this offering, we are offering shares of our common stock at $ per share. Assuming no shares are issued pursuant to the underwriters' option to purchase up to an additional shares, this offering would result in gross proceeds of $ million to us. We currently estimate the expenses attributable to this offering to be $ million. Therefore, we estimate that our aggregate net proceeds from this offering will be $ million, after deducting our estimated offering expenses (or $ million, if the underwriters exercise their option to purchase up to an additional shares, in full).

We plan to use the net proceeds from this offering to purchase Agency RMBS and our potential target assets, focusing predominantly on Agency RMBS. Until appropriate investments can be identified, our Manager may invest the net proceeds from this offering in interest-bearing short-term investments, including money market accounts and/or funds, that are consistent with our intention to qualify as a REIT and maintain our exemption from registration under the 1940 Act. These initial investments, if any, are expected to provide a lower net return than we seek to achieve from investments in Agency RMBS and our additional target assets. We anticipate that we will be able to identify a sufficient amount of investments in Agency RMBS and our additional target assets within approximately one to two months after the closing of this offering. However, depending on the availability of appropriate investment opportunities and subject to market prevailing conditions, there can be no assurance that we will be able to identify a sufficient amount of investments within this timeframe.

Prior to the time we have fully used the net proceeds of this offering to acquire Agency RMBS and additional target assets, we may fund our quarterly distributions out of such net proceeds.

We intend to make regular quarterly distributions to holders of our common stock. U.S. federal income tax law generally requires that a REIT distribute annually at least 90% of its net taxable income and that it pay tax at regular corporate rates to the extent that it annually distributes less than 100% of its net taxable income. We generally intend to make total annual distributions equal to all or substantially all of our taxable income for that year.

If we pay a taxable stock distribution, our stockholders would be sent a form that would allow each stockholder to elect to receive its proportionate share of such distribution in all cash or in all stock, and the distribution will be made in accordance with such elections, provided that if the stockholders' elections, in the aggregate, would result in the payment of cash in excess of the maximum amount of cash to be distributed, then cash payments to stockholders who elect to receive cash will be prorated, and the excess of each such stockholder's entitlement in the distribution, less such prorated cash payment, would be paid to such stockholder in shares of our common stock.

To the extent that in respect of any calendar year, cash available for distribution is less than our net taxable income, we could be required to sell assets or borrow funds to make cash distributions or make a portion of the required distribution in the form of a taxable stock distribution or distribution of debt securities. In addition, prior to the time we have fully invested the net proceeds of this offering, we may fund our quarterly distributions out of such net proceeds, which would reduce the amount of cash we have available for investing and other purposes. We will generally not be required to make distributions with respect to activities conducted through any taxable REIT subsidiaries, or TRSs. For more information, see "U.S. federal income tax considerations—Taxation of Western Asset Mortgage Capital Corporation."

To satisfy the requirements to qualify as a REIT and generally not be subject to U.S. federal income and excise tax, we intend to make regular quarterly distributions and to distribute all or substantially all of our net taxable income on an annual basis to holders of our common stock out of assets legally available therefor. The amount of cash available for distribution will be decreased by any fees or expenses payable by us to our Manager under the management agreement. Any distributions we make will be at the discretion of our board of directors and will depend upon our earnings and financial condition, debt covenants, funding or margin requirements under repurchase agreements, warehouse facilities or other secured and unsecured borrowing agreements, maintenance of our REIT qualification, restrictions under Delaware law, and such other factors as our board of directors deems relevant. Our earnings and financial condition will be affected by various factors, including the net interest and other income from our portfolio, our operating expenses and any other expenditures. For more information regarding risk factors that could materially adversely affect our earnings and financial condition, see "Risk Factors."

We anticipate that our distributions generally will be taxable as ordinary income to our stockholders, although a portion of the distributions may be designated by us as qualified dividend income or capital gain, or may constitute a return of capital. We will furnish annually to each of our stockholders a statement setting forth distributions paid during the preceding year and their characterization as ordinary income, return of capital, qualified dividend income or capital gain. For more information, see "U.S. Federal Income Tax Considerations—Taxation of stockholders—Taxation of taxable domestic stockholders."

The following table sets forth (1) our actual capitalization at December 31, 2012, and (2) our capitalization as adjusted to reflect the effect of:

You should read this table together with "Use of Proceeds" included elsewhere in this prospectus.

	As of December 31, 2012

	Actual		As Adjusted
	(in thousands)
Cash and cash equivalents		56,292
Liabilities:
Borrowings under repurchase agreements		4,794,730
Other liabilities		47,026
Total liabilities		4,841,756
Stockholder's equity:
Common stock, par value $0.01 per share; 500,000,000 shares authorized and 24,143,944 shares issued and outstanding, actual and 500,000,000 shares authorized and shares issued and outstanding, as adjusted⁽¹⁾		241
Preferred stock, par value $0.01 per share; 100,000,000 shares authorized and 0 shares issued and outstanding, actual and as adjusted		—		—
Additional paid in capital⁽²⁾		505,454
Retained earnings		17,513
Total stockholder's equity		523,208

(1): Does not include: (i) the approximately 1,115,893 shares initially issuable upon exercise of our outstanding warrants, and (ii) the shares of our common stock available for future grants under our equity incentive plans, which is expected to be equal to shares of our common stock at the completion of this offering (after deduction of the grant of 201,159 shares of restricted common stock to our Manager and an aggregate of 4,500 shares of restricted common stock to our three independent directors upon the consummation of our IPO and the grant of an aggregate of 21,014 shares of restricted common stock to our chief financial officer).
(2): Additional paid-in-capital, as adjusted has been reduced by our estimated offering expenses, which we currently estimate to be $ million and the underwriting discount of $ million.

Description of Our Investment Guidelines and Certain Other Operating Policies

Our board of directors has adopted a set of investment guidelines that sets forth our target asset classes and other criteria to be used by our Manager to evaluate specific assets as well as our overall portfolio composition. Our Manager makes determinations as to the percentage of our assets that will be invested in each of our target asset classes, consistent with the investment guidelines adopted by our board of directors and the limits necessary to maintain compliance with REIT tax rules and our exemption under the 1940 Act. Our Manager's investment decisions depend on prevailing market conditions and may change over time in response to opportunities available in different interest rate, economic and credit environments. As a result, we cannot predict the percentage of our assets that will be invested in any of our target asset classes at any given time, although we are focused on investing in Agency RMBS, and to date have invested primarily in Agency RMBS. We believe that the diversification of our portfolio of assets, our Manager's extensive experience in investing in Agency RMBS and our potential target assets and the flexibility of our strategy, combined with our Manager's and its supervised affiliates' general investment and advisory expertise and comprehensive finance and administrative infrastructure, will enable us to achieve attractive risk-adjusted returns under a variety of market conditions and economic cycles.

These investment guidelines may be changed from time to time by our board of directors without the approval of our stockholders. Changes to our investment guidelines may include, without limitation, modification or expansion of the types of assets in which we may invest.

Our Manager has appointed an investment oversight committee that is made up of senior investment personnel from our Manager and is tasked with reviewing, considering and approving our interest rate, hedging and leverage strategies. The investment oversight committee is composed of our chief investment officer and senior members of the Agency MBS team, as well as one of our Manager's senior generalist portfolio managers, senior portfolio managers from our Manager's liquidity trading desk and derivatives trading desk and senior personnel from our Manager's portfolio and quantitative analytics team. The investment oversight committee meets as frequently as necessary in order for us to make rapid investment decisions. The investment oversight committee also periodically reviews our investment portfolio and is available to provide updates to our board of directors in connection with its reviews of our investment performance.

If our board of directors determines that additional funding is required, we may raise such funds through additional offerings of equity or debt securities or the retention of cash flow (subject to REIT distribution requirements) or a combination of these methods. In the event that our board of directors determines to raise additional equity capital, it has the authority, without stockholder approval, to issue

additional common stock or preferred stock in any manner and on such terms and for such consideration as it deems appropriate, at any time.

In addition, we may borrow money to finance the acquisition of investments. We use traditional forms of financing, such as repurchase agreements. Our investment guidelines and our portfolio and leverage are periodically reviewed by our board of directors as part of their oversight of our Manager.

As of the date of this prospectus, we do not intend to offer equity or debt securities in exchange for property. Though we have no current intention to do so, we may in the future repurchase or otherwise reacquire our shares.

As of the date of this prospectus, we do not intend to invest in the securities of other REITs, other entities engaged in real estate activities or securities of other issuers for the purpose of exercising control over such entities.

We engage in the purchase and sale of investments. We may make loans to third parties in the ordinary course of business for investment purposes. As of the date of this prospectus, we do not intend to underwrite the securities of other issuers.

We intend to furnish our stockholders with annual reports containing consolidated financial statements audited by our independent certified public accountants and file quarterly reports with the SEC containing unaudited consolidated financial statements for each of the first three quarters of each fiscal year.

Our board of directors may change any of these policies without prior notice to you or a vote of our stockholders.

We are dependent on our Manager for our day-to-day management. All of our officers, apart from our chief financial officer, Steven M. Sherwyn, are employees of our Manager. In addition two, of our directors, James W. Hirschmann III and Gavin L. James, are also employees of our Manager. We do not have any employees other than our chief financial officer. Our Manager does not serve us exclusively and is not obligated to dedicate any of its personnel to us. Because our Manager serves other clients in addition to us, it is difficult to estimate the amount of time our Manager or its personnel will allocate to our business. The obligations of our Manager and its officers and personnel to engage in other business activities may reduce the time our Manager and its officers and personnel spend managing us.

Our Management Agreement with our Manager was negotiated between related parties and its terms, including fees and other amounts payable, may not be as favorable to us as if it had been negotiated at arm's length with an unaffiliated third party.

We pay our Manager a management fee that is not tied to our performance. The management fee may not sufficiently incentivize our Manager to generate attractive risk-adjusted returns for us. This could hurt both our ability to make distributions to our stockholders and the market price of our common stock.

Our Manager has an investment allocation policy in place that is designed to treat all of its client accounts fairly and equitably with the goal of providing all clients with the best execution under the

circumstances for transactions in fixed-income securities. Our Manager's investment allocation policy provides that no single client is intentionally favored over another and the procedures associated with this policy require our Manager's investment management department to allocate trades in a fair and equitable manner. When possible, in order to minimize transaction costs and seek best execution for all client accounts, transactions may be bunched or blocked together, with securities generally allocated to client accounts on a pro rata basis. According to our Manager's investment allocation policy, investments may be allocated by taking into account factors, including but not limited to investment goals or guidelines, available cash, liquidity requirements, odd lot positions, minimum allocations, existing portfolio holdings compared to target weightings, regulatory and legal restrictions and the tax implications of an investment. Our Manager's investment allocation policy requires that these bunched or blocked trades be allocated on the same day they are executed and requires that all clients receive the same average cost for the transaction.

Our Manager periodically reviews its client accounts to identify situations where a potential conflict may exist, and when appropriate, may design specific procedures to address these situations. The investment allocation policy may be amended by our Manager at any time without our consent. To the extent that our Manager's or our business changes in such a way as to give rise to conflicts not currently addressed by our Manager's investment allocation policy, our Manager may need to refine its investment allocation policy to address such situation. In addition, to avoid any actual or perceived conflicts of interest with our Manager, prior to an acquisition of any security structured or issued by an entity managed by our Manager or any of its affiliates or the purchase or sale by us of any asset from us or to us by an entity managed by our Manager or any of its affiliates, such transaction must be approved by our board of directors, including a majority of our independent directors.

We do not have any agreement or understanding with our Manager that would give us any priority over any other client of our Manager in opportunities to invest in Agency RMBS or any class of our additional target assets. Accordingly, we may compete for investment opportunities in these asset classes directly with other investment portfolios managed by our Manager. Investment portfolios managed by our Manager invest primarily in real estate or real estate-related assets, including Agency RMBS and our additional target assets and a substantial number of investment portfolios managed by our Manager have exposure to Agency RMBS and our additional target assets. In addition, our Manager may in the future have additional clients that may compete with us for investment opportunities in Agency RMBS and our additional target assets.

We do not have a policy that expressly prohibits our directors, officers, security holders or affiliates from engaging for their own account in business activities of the types conducted by us. However, subject to our Manager's investment allocation policy, our code of conduct contains a conflicts of interest policy that prohibits our directors, officers and personnel, as well as employees of our Manager who provide services to us, from engaging in any transaction that involves an actual conflict of interest with us.

The following is a summary of the rights and preferences of our common stock, preferred stock, units and warrants (which are represented by certificates) and the related provisions of our amended and restated certificate of incorporation and amended and restated bylaws, as each is in effect as the date hereof. While we believe that the following description covers the material terms of our capital stock and other securities, the description may not contain all of the information that is important to you. We encourage you to read carefully this entire prospectus, our amended and restated certificate of incorporation, amended and restated bylaws and warrants and warrant certificates and the other documents we refer to for a more complete understanding of our capital stock and other securities. Copies of our amended and restated certificate of incorporation, amended and restated bylaws and warrants and warrant certificates are filed as exhibits to the registration statement of which this prospectus is a part. See "Where you can find more information."

Our amended and restated certificate of incorporation provides that we may issue up to 500,000,000 shares of common stock and 100,000,000 shares of preferred stock, both having par value $0.01 per share. After giving effect to this offering, shares of our common stock will be issued and outstanding on a fully diluted basis, shares if the underwriters' option to purchase up to an additional shares is exercised in full), and no shares of preferred stock will be issued and outstanding.

Subject to the restrictions contained in our amended and restated certificate of incorporation regarding the transfer and ownership of our capital stock and except as may otherwise be specified in the terms of any class or series of common stock, our common stockholders will be entitled to one vote per share. Our common stockholders will not be entitled to cumulate their votes in the election of directors. Generally, all matters to be voted on by stockholders must be approved by a majority (or, in the case of election of directors, by a plurality) of the votes entitled to be cast by all holders of our common stock present in person or represented by proxy, voting together as a single class. Except as otherwise provided by law, amendments to our amended and restated certificate of incorporation must be approved by a majority or, in some cases, a super-majority of the combined voting power of all shares of common stock, voting together as a single class.

Subject to the restrictions contained in our amended and restated certificate of incorporation regarding the transfer and ownership of our capital stock, our common stockholders will share ratably (based on the number of common shares held) if and when any dividend is declared by our board of directors. Dividends consisting of common stock may be paid only as follows: (1) common stock may be paid only to holders of common stock; and (2) shares shall be paid proportionally with respect to each outstanding common share. We may not subdivide or combine shares of any class of common stock or issue a dividend on shares of any class of common stock without at the same time proportionally subdividing or combining shares of any other class or issuing a similar dividend on any other class.

Upon our liquidation, dissolution or winding up, each of our common stockholders will be entitled to a pro rata dividend of any assets available for dividend to common stockholders.

In the event of our merger or consolidation with or into another company in connection with which shares of common stock are converted into or exchangeable for shares of stock, other securities or property (including cash), our common stockholders will be entitled to receive the same kind and amount of shares of stock and other securities and property (including cash). No shares of our common stock will be subject to redemption or have preemptive rights to purchase additional shares. All the outstanding shares of common stock are validly issued, fully paid and non-assessable.

The following is a brief summary of certain provisions of the warrants to purchase an aggregate of 1,115,893 shares of our common stock, which warrants we issued on May 15, 2012. The following summary does not purport to be complete and is qualified in its entirety by reference to the warrants and warrant certificates a copy of which is filed with the SEC together as an exhibit to the registration statement of which this prospectus is a part.

Each warrant entitles the warrantholder to purchase 0.5 of one share of our common stock, which we refer to as the warrant shares. The initial exercise price of the warrants was $20.50 per share. The initial exercise price is subject to adjustment as described under "—Adjustments." Following our public offering that closed on October 3, 2012, the exercise price of the warrants was adjusted to $19.44. The warrants will become exercisable, in whole or in part (but in each case for a minimum of at least 5,000 warrant shares or such lesser number of warrant shares for which a warrant remains exercisable), six months after the date of issuance and will expire at the close of business on May 15, 2019. The warrants have not been, and will not be, registered under the Securities Act and the warrants may not be exercised unless an exemption from such registration is available in respect of the issuance of the warrant shares.

Upon receipt of payment of the exercise price and the applicable warrant certificate, together with a form of election attached thereto, properly completed and duly executed at our office, we will, within a reasonable time, forward the warrant shares issuable upon exercise of the warrants. Payment may be made: (1) in cash or by certified bank check or by wire transfer of funds to an account designated by us for such purpose or (2) without the payment of cash as set forth below under "—Cashless exercise."

The exercise price of the warrants and the number of warrant shares issuable upon exercise of the warrants are subject to adjustment from time to time as set forth below.

If: (1) there is an effective shelf registration statement available for the warrant shares to be issued upon exercise of the warrants; and (2) the trading price of our common stock has been $10.00 or greater than the warrant exercise price of the warrants for 20 of the last 30 trading days, we will have the option, but not the obligation, to redeem all, but not less than all, of the outstanding warrants at a price of $0.01 per each warrant issuable if the warrants were to be exercised. In the event we elect to exercise our redemption option, we will furnish to each warrantholder a written notice of redemption setting forth the redemption date, which may be set no earlier than 30 days following the date the redemption notice is furnished to warrantholders. Each warrantholder will have the option to exercise its warrants, at any time prior to (but not including) the redemption date described above.

Each warrant includes a cashless exercise provision which permits the warrantholder to elect to exercise the warrant without paying the cash exercise price, and receive a number of shares determined by multiplying: (1) the number of shares for which the warrant is being exercised by (2) the difference between the volume weighted average price for the 20 trading days immediately prior to (but not including) the date of exercise of the warrant and the exercise price in effect on the date immediately prior to (but not including) the date of exercise of the warrant, and dividing such product by the

volume weighted average price for the 20 trading days immediately prior to (but not including) the date of exercise.

Each warrant contains restrictions on the number of warrant shares that may be acquired by the warrantholder upon an exercise of the warrant. No warrantholder (including its affiliates) may beneficially or constructively own more than 9.8% of the total number of issued and outstanding shares of our common stock (including for such purpose the shares of our common stock issuable upon such exercise). For additional information on the ownership restrictions of our capital stock, please see "—Restrictions on ownership and transfer of our capital stock."

Prior to the exercise of a warrant, a warrantholder will not have or exercise any rights as a stockholder by virtue of its ownership of a warrant.

Our amended and restated certificate of incorporation provides that our board of directors has the authority, without action by the stockholders, to designate and issue up to 100,000,000 shares of preferred stock in one or more classes or series and to fix the rights, preferences, privileges and restrictions of each class or series of preferred stock, including dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences and the number of shares constituting any class or series, which may be greater than the rights of the holders of the common stock. There are no shares of preferred stock outstanding. Any issuance of shares of preferred stock could adversely affect the voting power of holders of common stock, and the likelihood that the holders will receive dividend payments and payments upon liquidation could have the effect of delaying, deferring or preventing a change in control. We have no present plans to issue any shares of preferred stock.

In order to qualify as a REIT under the Internal Revenue Code for each taxable year beginning after December 31, 2012, our shares of capital stock must be beneficially owned by 100 or more persons during at least 335 days of a taxable year of 12 months or during a proportionate part of a shorter taxable year. Also, for our taxable years beginning after December 31, 2012, no more than 50% of the value of our outstanding shares of capital stock may be owned, directly or constructively, by five or fewer individuals (as defined in the Internal Revenue Code to include certain entities) during the second half of any calendar year.

Our amended and restated certificate of incorporation, subject to certain exceptions, contains restrictions on the number of shares of our capital stock that a person may own and may prohibit certain entities from owning our shares. Our amended and restated certificate of incorporation provides that (subject to certain exceptions described below) no person may beneficially or constructively own, or be deemed to own by virtue of the attribution provisions of the Internal Revenue Code, more than 9.8% in value or in number of shares, whichever is more restrictive, of our outstanding shares of common or capital stock. Pursuant to our amended and restated certificate of incorporation, our board of directors has the power to increase or decrease the percentage of common or capital stock that a person may beneficially or constructively own. However, any decreased stock ownership limit will not apply to any person whose percentage ownership of our common or capital stock, as the case may be, is in excess of such decreased stock ownership limit until that person's percentage ownership of our common or capital stock, as the case may be, equals or falls below the decreased stock ownership limit. Until such a person's percentage ownership of our common or capital stock, as the case may be, falls

below such decreased stock ownership limit, any further acquisition of common stock will be in violation of the decreased stock ownership limit. If our board of directors changes the stock ownership limit, it will: (1) notify each stockholder of record of any such change; and (2) publicly announce any such change, in each case at least 30 days prior to the effective date of such change. For purposes of this calculation, warrants treated as held by any stockholder will be deemed to have been exercised when calculating such holder's ownership of capital stock. However, warrants held by other unrelated persons will not be deemed to have been exercised.

Our amended and restated certificate of incorporation also prohibits any person from beneficially or constructively owning shares of our capital stock that would result in our being "closely held" under Section 856(h) of the Internal Revenue Code or otherwise cause us to fail to qualify as a REIT and from transferring shares of our capital stock if the transfer would result in our capital stock being beneficially owned by fewer than 100 persons. In addition, no such person may own an interest in any tenant that would cause us to own, actually or constructively, more than a 9.9% interest in such tenant. Any person who acquires or attempts or intends to acquire beneficial or constructive ownership of shares of our capital stock that will or may violate any of the foregoing restrictions on transferability and ownership, or who is the intended transferee of shares of our capital stock that are transferred to the trust (as described below), is required to give written notice immediately to us and provide us with such other information as we may request in order to determine the effect of such transfer on our qualification as a REIT. The foregoing restrictions on transferability and ownership will not apply if our board of directors determines that it is no longer in our best interests to attempt to qualify, or to continue to qualify, as a REIT.

Our board of directors, in its sole discretion, may exempt a person from the foregoing restrictions. The person seeking an exemption must provide to our board of directors such representations and undertakings and satisfy such conditions, in each case as our board of directors may deem reasonably necessary to conclude that granting the exemption will not cause us to lose our qualification as a REIT. Our board of directors may also require a ruling from the Internal Revenue Service ("IRS") or an opinion of counsel in order to determine or ensure our qualification as a REIT in the context of granting such exemptions.

Any attempted transfer of our capital stock which, if effective, would result in a violation of the foregoing restrictions will cause the number of shares causing the violation (rounded up to the nearest whole share) to be automatically transferred to a trust for the exclusive benefit of one or more charitable beneficiaries, and the proposed transferee will not acquire any rights in such shares. The automatic transfer will be deemed to be effective as of the close of business on the business day (as defined in our amended and restated certificate of incorporation) prior to the date of the transfer. If, for any reason, the transfer to the trust does not occur or would not prevent a violation of the restrictions on ownership contained in our amended and restated certificate of incorporation, our amended and restated certificate of incorporation provides that the purported transfer will be void ab initio. Shares of our capital stock held in the trust will be issued and outstanding shares. The proposed transferee will not benefit economically from ownership of any shares of our capital stock held in the trust, will have no rights to dividends and no rights to vote or other rights attributable to the shares of capital stock held in the trust. The trustee of the trust will have all voting rights and rights to dividends or other distributions with respect to shares held in the trust. These rights will be exercised for the exclusive benefit of the charitable beneficiary. Any dividend or other distribution paid prior to our discovery that shares of capital stock have been transferred to the trust will be paid by the recipient to the trustee upon demand. Any dividend or other distribution authorized but unpaid will be paid when due to the trustee. Any dividend or distribution paid to the trustee will be held in trust for the charitable beneficiary. Subject to Delaware law, the trustee will have the authority to rescind as void any vote cast by the proposed transferee prior to our discovery that the shares have been transferred to the trust and to recast the vote in accordance with the desires of the trustee acting for the benefit of

the charitable beneficiary. However, if we have already taken irreversible corporate action, then the trustee will not have the authority to rescind and recast the vote.

Within 20 days of receiving notice from us that shares of our capital stock have been transferred to the trust, the trustee will sell the shares to a person designated by the trustee, whose ownership of the shares will not violate the above ownership limitations. Upon such sale, the interest of the charitable beneficiary in the shares sold will terminate and the trustee will distribute the net proceeds of the sale to the proposed transferee and to the charitable beneficiary as follows: the proposed transferee will receive the lesser of: (1) the price paid by the proposed transferee for the shares or, if the proposed transferee did not give value for the shares in connection with the event causing the shares to be held in the trust (e.g., a gift, devise or other similar transaction), the market price (as defined in our amended and restated certificate of incorporation) of the shares on the day of the event causing the shares to be held in the trust and (2) the price received by the trustee from the sale or other disposition of the shares. Any net sale proceeds in excess of the amount payable to the proposed transferee will be paid immediately to the charitable beneficiary. If, prior to our discovery that shares of our capital stock have been transferred to the trust, the shares are sold by the proposed transferee, then: (1) the shares shall be deemed to have been sold on behalf of the trust and (2) to the extent that the proposed transferee received an amount for the shares that exceeds the amount the proposed transferee was entitled to receive, the excess shall be paid to the trustee upon demand.

In addition, shares of our capital stock held in the trust will be deemed to have been offered for sale to us, or our designee, at a price per share equal to the lesser of the price per share in the transaction that resulted in the transfer to the trust (or, in the case of a devise or gift, the market price at the time of the devise or gift) and the market price on the date we, or our designee, accept the offer. We will have the right to accept the offer until the trustee has sold the shares. Upon a sale to us, the interest of the charitable beneficiary in the shares sold will terminate and the trustee will distribute the net proceeds of the sale to the proposed transferee.

Every owner of more than 5% (or such lower percentage as required by the Internal Revenue Code or the regulations promulgated thereunder) in number or in value of all classes or series of our capital stock, including shares of our common stock, within 30 days after the end of each taxable year, will be required to give written notice to us stating the name and address of such owner, the number of shares of each class and series of shares of our capital stock that the owner beneficially owns and a description of the manner in which the shares are held. Each owner shall provide to us such additional information as we may request to determine the effect, if any, of the beneficial ownership on our qualification as a REIT and to ensure compliance with the ownership limitations. In addition, each such owner shall, upon demand, be required to provide to us such information as we may request, in good faith, to determine our qualification as a REIT and to comply with the requirements of any taxing authority or governmental authority or to determine such compliance and to ensure compliance with the 9.8% ownership limitations in our amended and restated certificate of incorporation.

These ownership limitations could delay, defer or prevent a transaction or a change in control that might involve a premium price for our common stock or might otherwise be in the best interests of our stockholders.

Anti-takeover effects of Delaware law and our amended and restated certificate of incorporation and amended and restated bylaws

Our amended and restated certificate of incorporation, which has been filed with the State of Delaware and became effective immediately prior to the completion of our IPO on May 15, 2012, and our amended and restated bylaws contain provisions that are intended to enhance the likelihood of continuity and stability in the composition of our board of directors and that may have the effect of delaying, deferring or preventing a future takeover or change in control of our company unless the

takeover or change in control is approved by our board of directors. In addition to the above-described restrictions regarding the transfer and ownership of our capital stock, these provisions include the following:

Our amended and restated certificate of incorporation provides that stockholder action may not be taken by written consent in lieu of a meeting and that stockholder action may be taken only at an annual or special meeting of stockholders.

Our amended and restated bylaws provide that, except as otherwise required by law, special meetings of our stockholders can only be called by our president, pursuant to a resolution adopted by a majority of our board of directors or a committee of our board of directors that has been duly designated by our board of directors and whose powers and authority include the power to call such meetings, or by the chairman of our board of directors. Stockholders are not permitted to call a special meeting or to require our board of directors to call a special meeting.

Our amended and restated certificate of incorporation provides that members of our board of directors may only be removed for cause, and only with the affirmative vote of the holders of at least 66% of the combined voting power of all the shares of all classes of our capital stock entitled to vote generally in the election of directors. Our amended and restated bylaws provide that only our board of directors may fill vacant directorships. These provisions would prevent a stockholder from gaining control of our board of directors by removing incumbent directors and filling the resulting vacancies with such stockholder's own nominees.

Amendment of amended and restated certificate of incorporation and amended and restated bylaws

The DGCL provides generally that the affirmative vote of a majority of the outstanding shares entitled to vote is required to amend or repeal a corporation's amended and restated certificate of incorporation or amended and restated bylaws, unless the amended and restated certificate of incorporation requires a greater percentage. Our amended and restated certificate of incorporation generally requires the approval of both a majority of the combined voting power of all the classes of shares of our capital stock entitled to vote generally in the election of directors and a majority of the members of our board of directors to amend any provisions of our amended and restated certificate of incorporation, except that provisions of our amended and restated certificate of incorporation relating to the powers, numbers, classes, elections, terms and removal of our directors, as well as the ability to fill vacancies on our board of directors requires the affirmative vote of at least 66% of the combined voting power of all the shares of all classes of our capital stock entitled to vote generally in the election of directors. In addition, our amended and restated certificate of incorporation: (1) grants our board of directors the authority to amend and repeal our amended and restated bylaws without a stockholder vote in any manner not inconsistent with the DGCL and (2) requires that stockholders may only amend our amended and restated bylaws with the affirmative vote of 66% of the combined voting power of all the shares of all classes of our capital stock entitled to vote generally in the election of directors.

The foregoing provisions of our amended and restated certificate of incorporation and amended and restated bylaws could discourage potential acquisition proposals and could delay or prevent a change in control. These provisions are intended to enhance the likelihood of continuity and stability in the composition of our board of directors and in the policies formulated by our board of directors and to discourage certain types of transactions that may involve an actual or threatened change of control.

These provisions are designed to reduce our vulnerability to an unsolicited acquisition proposal. The provisions also are intended to discourage certain tactics that may be used in proxy fights. However, such provisions could have the effect of discouraging others from making tender offers for our shares and, as a consequence, they also may inhibit fluctuations in the market price of our common stock that could result from actual or rumored takeover attempts. Such provisions also may have the effect of preventing changes in our management or delaying or preventing a transaction that might benefit you or other minority stockholders.

We will not be subject to Section 203 of the DGCL, an anti-takeover law. In general, Section 203 prohibits a publicly-held Delaware corporation from engaging in a "business combination" with an "interested stockholder" for a period of three years following the date the person became an interested stockholder, unless (with certain exceptions) the "business combination" or the transaction in which the person became an interested stockholder is approved in a prescribed manner. Generally, a "business combination" includes a merger, asset or stock sale, or other transaction resulting in a financial benefit to the interested stockholder. Generally, an "interested stockholder" is a person who, together with affiliates and associates, owns (or within three years prior to the determination of interested stockholder status, did own) 15% or more of a corporation's voting stock. In our amended and restated certificate of incorporation, we have elected not to be bound by Section 203 of the DGCL.

Our amended and restated certificate of incorporation and amended and restated bylaws provide indemnification for our directors and officers to the fullest extent permitted by the DGCL, except that such directors and officers will not be indemnified to the extent that any such person has committed willful misfeasance, bad faith, gross negligence or reckless disregard involved in the conduct of such person's duty to or for us. In addition, as permitted by Delaware law, our amended and restated certificate of incorporation includes provisions that eliminate the personal liability of our directors for monetary damages resulting from breaches of certain fiduciary duties as a director. The effect of this provision is to restrict our rights and the rights of our stockholders in derivative suits to recover monetary damages against a director for breach of fiduciary duties as a director, except that a director will be personally liable to the extent such director has committed willful misfeasance, bad faith, gross negligence or reckless disregard of such director's duties involved in the conduct of the office of director.

We have entered into indemnification agreements with each of our directors and executive officers that provide for indemnification to the maximum extent permitted by Delaware law.

The above-described limitation of liability and indemnification may be held not to be enforceable for violations of the federal securities laws of the United States.

The transfer agent and registrar for our shares of common stock is American Stock Transfer and Trust Company.

The following is a summary of the material U.S. federal income tax consequences of an investment in common stock of Western Asset Mortgage Capital Corporation. For purposes of this section under the heading "U.S. federal income tax considerations," references to "Western Asset Mortgage Capital Corporation," "we," "our" and "us" mean only Western Asset Mortgage Capital Corporation, except as otherwise indicated. This summary is based upon the Internal Revenue Code, the regulations promulgated by the U.S. Department of the Treasury, or the Treasury, rulings and other administrative pronouncements issued by the IRS, and judicial decisions, all as currently in effect, and all of which are subject to differing interpretations or to change, possibly with retroactive effect. No assurance can be given that the IRS would not assert, or that a court would not sustain, a position contrary to any of the tax consequences described below. We have not sought and will not seek an advance ruling from the IRS regarding any matter discussed in this prospectus. The summary is also based upon the assumption that we and our subsidiaries and affiliated entities will operate in accordance with our and their applicable organizational documents. This summary is for general information only and is not tax advice. It does not purport to discuss all aspects of U.S. federal income taxation that may be important to a particular investor in light of its investment or tax circumstances or to investors subject to special tax rules, such as:

This summary assumes that investors will hold their common stock as a capital asset, which generally means as property held for investment.

The U.S. federal income tax treatment of holders of our common stock depends in some instances on determinations of fact and interpretations of complex provisions of U.S. federal income tax law for which no clear precedent or authority may be available. In addition, the tax consequences to any particular stockholder of holding our common stock will depend on the stockholder's particular tax circumstances. You are urged to consult your tax advisor regarding the U.S. federal, state, local, and foreign income and other tax consequences to you in light of your particular investment or tax circumstances of acquiring, holding, exchanging, or otherwise disposing of our common stock.

We intend to elect to be taxed as a REIT commencing with our taxable year ended December 31, 2012, upon the filing of our U.S. federal income tax return for such year. We believe that, commencing with such taxable year, we are organized and operate in such a manner as to qualify for taxation as a

REIT under the applicable provisions of the Internal Revenue Code. We intend to continue to operate in such a manner to qualify for taxation as a REIT.

The law firm of Skadden, Arps, Slate, Meagher & Flom LLP has acted as our tax counsel in connection with our formation and election to be taxed as a REIT. In connection with this offering of our common stock, we will receive an opinion of Skadden, Arps, Slate, Meagher & Flom LLP to the effect that, commencing with our initial taxable year, we have been organized in conformity with the requirements for qualification and taxation as a REIT under the Internal Revenue Code, and that our actual method of operation has enabled, and our proposed method of operation will continue to enable, us to meet the requirements for qualification and taxation as a REIT commencing with our taxable year ended December 31, 2012. It must be emphasized that the opinion of Skadden, Arps, Slate, Meagher & Flom LLP will be based on various assumptions relating to our organization and operation, and will be conditioned upon fact-based representations and covenants made by our management regarding our organization, assets, and income, and the present and future conduct of our business operations. While we intend to operate so that we will qualify as a REIT, given the highly complex nature of the rules governing REITs, the ongoing importance of factual determinations, and the possibility of future changes in our circumstances, no assurance can be given by Skadden, Arps, Slate, Meagher & Flom LLP or by us that we will qualify as a REIT for any particular year. The opinion will be expressed as of the date issued. Skadden, Arps, Slate, Meagher & Flom LLP will have no obligation to advise us or our stockholders of any subsequent change in the matters stated, represented or assumed, or of any subsequent change in the applicable law. You should be aware that opinions of counsel are not binding on the IRS, and no assurance can be given that the IRS will not challenge the conclusions set forth in such opinions.

Qualification and taxation as a REIT depend on our ability to meet on a continuing basis, through actual operating results, distribution levels, and diversity of stock and asset ownership, various qualification requirements imposed upon REITs by the Internal Revenue Code, the compliance with which will not be reviewed by Skadden, Arps, Slate, Meagher & Flom LLP. Our ability to qualify as a REIT also requires that we satisfy certain asset tests, some of which depend upon the fair market values of assets that we own directly or indirectly. Such values may not be susceptible to a precise determination. Accordingly, no assurance can be given that the actual results of our operations for any taxable year will satisfy such requirements for qualification and taxation as a REIT.

As indicated above, our qualification and taxation as a REIT depends upon our ability to meet, on a continuing basis, various qualification requirements imposed upon REITs by the Internal Revenue Code. The material qualification requirements are summarized below under "—Requirements for qualification—General." While we intend to operate so that we qualify as a REIT, no assurance can be given that the IRS will not challenge our qualification, or that we will be able to operate in accordance with the REIT requirements in the future. See "—Failure to qualify."

Provided that we qualify as a REIT, generally we will be entitled to a deduction for dividends that we pay and therefore will not be subject to U.S. federal corporate income tax on our taxable income that is currently distributed to our stockholders. This treatment substantially eliminates the "double taxation" at the corporate and stockholder levels that generally results from investment in a corporation. In general, the income that we generate is taxed only at the stockholder level upon a distribution of dividends to our stockholders.

Currently, most U.S. stockholders that are individuals, trusts or estates are taxed on corporate dividends at a maximum U.S. federal income tax rate of 20% (commencing in 2013). With limited exceptions, however, dividends from us or from other entities that are taxed as REITs are generally not eligible for this rate and will continue to be taxed at rates applicable to ordinary income. Under current law, the highest marginal non-corporate U.S. federal income tax rate applicable to ordinary income is 39.6%. See "—Taxation of stockholders—Taxation of taxable domestic stockholders—Distributions."

Any net operating losses, foreign tax credits and other tax attributes generally do not pass through to our stockholders, subject to special rules for certain items such as the capital gains that we recognize. See "—Taxation of stockholders—Taxation of taxable domestic stockholders—Distributions."

If we qualify as a REIT, we will nonetheless be subject to U.S. federal tax in the following circumstances:

In addition, we and our subsidiaries may be subject to a variety of taxes, including payroll taxes and state, local, and foreign income, property and other taxes on our assets and operations. We could also be subject to tax in situations and on transactions not presently contemplated.

The Internal Revenue Code defines a REIT as a corporation, trust or association:

The Internal Revenue Code provides that conditions (1) through (4) must be met during the entire taxable year, and that condition (5) must be met during at least 335 days of a taxable year of 12 months, or during a proportionate part of a shorter taxable year. Conditions (5) and (6) need not be met during a corporation's initial tax year as a REIT (which, in our case, is 2012). Our amended and restated certificate of incorporation provides restrictions regarding the ownership and transfers of our stock, which are intended to assist us in satisfying the stock ownership requirements described in conditions (5) and (6) above.

To monitor compliance with the stock ownership requirements, we generally are required to maintain records regarding the actual ownership of our stocks. To do so, we must demand written statements each year from the record holders of significant percentages of our stock pursuant to which the record holders must disclose the actual owners of the stock (i.e., the persons required to include our dividends in their gross income). We must maintain a list of those persons failing or refusing to comply with this demand as part of our records. We could be subject to monetary penalties if we fail to comply with these record-keeping requirements. If you fail or refuse to comply with the demands, you will be required by Treasury regulations to submit a statement with your tax return disclosing your actual ownership of our stock and other information.

In addition, a corporation generally may not elect to become a REIT unless its taxable year is the calendar year. We adopted December 31 as our year-end, and thereby satisfy this requirement.

Ownership of partnership interests. If we are a partner in an entity that is treated as a partnership for U.S. federal income tax purposes, Treasury regulations provide that we are deemed to own our

proportionate share of the partnership's assets, and to earn our proportionate share of the partnership's income, for purposes of the asset and gross income tests applicable to REITs. Our proportionate share of a partnership's assets and income is based on our capital interest in the partnership (except that for purposes of the 10% value test, described below, our proportionate share of the partnership's assets is based on our proportionate interest in the equity and certain debt securities issued by the partnership). In addition, the assets and gross income of the partnership are deemed to retain the same character in our hands. Thus, our proportionate share of the assets and items of income of any of our subsidiary partnerships will be treated as our assets and items of income for purposes of applying the REIT requirements.

Disregarded subsidiaries. If we own a corporate subsidiary that is a "qualified REIT subsidiary," that subsidiary is generally disregarded for U.S. federal income tax purposes, and all of the subsidiary's assets, liabilities and items of income, deduction and credit are treated as our assets, liabilities and items of income, deduction and credit, including for purposes of the gross income and asset tests applicable to REITs. A qualified REIT subsidiary is any corporation, other than a TRS (as described below), that is directly or indirectly wholly-owned by a REIT. Other entities that are wholly-owned by us, including single member limited liability companies that have not elected to be taxed as corporations for U.S. federal income tax purposes, are also generally disregarded as separate entities for U.S. federal income tax purposes, including for purposes of the REIT income and asset tests. Disregarded subsidiaries, along with any partnerships in which we hold an equity interest, are sometimes referred to herein as "pass-through subsidiaries."

In the event that a disregarded subsidiary of ours ceases to be wholly-owned—for example, if any equity interest in the subsidiary is acquired by a person other than us or another disregarded subsidiary of ours—the subsidiary's separate existence would no longer be disregarded for U.S. federal income tax purposes. Instead, the subsidiary would have multiple owners and would be treated as either a partnership or a taxable corporation. Such an event could, depending on the circumstances, adversely affect our ability to satisfy the various asset and gross income requirements applicable to REITs, including the requirement that REITs generally may not own, directly or indirectly, more than 10% of the securities of another corporation. See "—Asset tests" and "—Income tests."

Taxable subsidiaries. In general, we may jointly elect with a subsidiary corporation, whether or not wholly-owned, to treat such subsidiary corporation as a TRS. We generally may not own more than 10% of the securities of a taxable corporation, as measured by voting power or value, unless we and such corporation elect to treat such corporation as a TRS. The separate existence of a TRS or other taxable corporation is not ignored for U.S. federal income tax purposes. Accordingly, a TRS or other taxable subsidiary corporation generally is subject to corporate income tax on its earnings, which may reduce the cash flow that we and our subsidiaries generate in the aggregate, and may reduce our ability to make distributions to our stockholders.

We are not treated as holding the assets of a TRS or other taxable subsidiary corporation or as receiving any income that the subsidiary earns. Rather, the stock issued by a taxable subsidiary to us is an asset in our hands, and we treat the dividends paid to us from such taxable subsidiary, if any, as income. This treatment can affect our income and asset test calculations, as described below. Because we do not include the assets and income of TRSs or other taxable subsidiary corporations in determining our compliance with the REIT requirements, we may use such entities to undertake indirectly activities that the REIT rules might otherwise preclude us from doing directly or through pass-through subsidiaries. For example, we may use TRSs or other taxable subsidiary corporations to conduct activities that give rise to certain categories of income such as management fees or to conduct activities that, if conducted by us directly, would be treated in our hands as prohibited transactions.

The TRS rules limit the deductibility of interest paid or accrued by a TRS to its parent REIT to assure that the TRS is subject to an appropriate level of corporate taxation. Further, the rules impose a 100% excise tax on transactions between a TRS and its parent REIT or the REIT's tenants that are

not conducted on an arm's-length basis. We intend that all of our transactions with our TRSs, if any, will be conducted on an arm's-length basis.

In order to qualify as a REIT, we must satisfy two gross income requirements on an annual basis. First, at least 75% of our gross income for each taxable year, excluding gross income from sales of inventory or dealer property in "prohibited transactions," discharge of indebtedness and certain hedging transactions, generally must be derived from investments relating to real property or mortgages on real property, including interest income derived from mortgage loans secured by real property (including certain types of mortgage-backed securities), "rents from real property," dividends received from other REITs, and gains from the sale of real estate assets, as well as specified income from temporary investments. Second, at least 95% of our gross income in each taxable year, excluding gross income from prohibited transactions, discharge of indebtedness and certain hedging transactions, must be derived from some combination of income that qualifies under the 75% gross income test described above, as well as other dividends, interest, and gain from the sale or disposition of stock or securities, which need not have any relation to real property. Income and gain from certain hedging transactions will be excluded from both the numerator and the denominator for purposes of both the 75% and 95% gross income tests.

Interest income. Interest income constitutes qualifying mortgage interest for purposes of the 75% gross income test (as described above) to the extent that the obligation upon which such interest is paid is secured by a mortgage on real property. If we receive interest income with respect to a mortgage loan that is secured by both real property and other property, and the highest principal amount of the loan outstanding during a taxable year exceeds the fair market value of the real property on the date that we acquired or originated the mortgage loan, the interest income will be apportioned between the real property and the other collateral, and our income from the arrangement will qualify for purposes of the 75% gross income test only to the extent that the interest is allocable to the real property. Even if a loan is not secured by real property, or is undersecured, the income that it generates may nonetheless qualify for purposes of the 95% gross income test.

We invest in Agency and non-Agency mortgage-backed securities that are either mortgage pass-through certificates or CMOs. We expect that such mortgage-backed securities will be treated either as interests in a grantor trust or as interests in a real estate mortgage investment conduit, or REMIC, for U.S. federal income tax purposes. In the case of mortgage-backed securities treated as interests in grantor trusts, we would be treated as owning an undivided beneficial ownership interest in the mortgage loans held by the grantor trust. The interest on such mortgage loans would be qualifying income for purposes of the 75% gross income test to the extent that the obligation is secured by real property, as discussed above. In the case of mortgage-backed securities treated as interests in a REMIC, income derived from REMIC interests will generally be treated as qualifying income for purposes of the 75% gross income tests. If less than 95% of the assets of the REMIC are real estate assets, however, then only a proportionate part of our interest in the REMIC and income derived from the interest will qualify for purposes of the 75% gross income test. In addition, some REMIC securitizations include imbedded interest swap or cap contracts or other derivative instruments that potentially could produce non-qualifying income for the holder of the related REMIC securities. We expect that substantially all of our income from mortgage-backed securities will be qualifying income for purposes of the REIT gross income tests.

We may purchase Agency RMBS through "to-be-announced" forward contracts, or TBAs, and may recognize income or gains from the disposition of those TBAs, through dollar roll transactions or otherwise. There is no direct authority with respect to the qualification of income or gains from dispositions of TBAs as gains from the sale of real property (including interests in real property and interests in mortgages on real property) or other qualifying income for purposes of the 75% gross

income test. Consequently, our ability to enter into dollar roll transactions and other dispositions of TBAs could be limited. No assurance can be given that the IRS will treat such income as qualifying income. We do not have significant income from the disposition of TBAs, and therefore do not expect such income to adversely affect our ability to meet the 75% and 95% gross income tests. In the event that such income were determined not to be qualifying for the 75% gross income test, we could be subject to a penalty tax or we could fail to qualify as a REIT if such income when added to any other non-qualifying income exceeded 25% of our gross income.

Dividend income. We may directly or indirectly receive distributions from TRSs or other corporations that are not REITs or qualified REIT subsidiaries. These distributions generally are treated as dividend income to the extent of the earnings and profits of the distributing corporation. Such distributions will generally constitute qualifying income for purposes of the 95% gross income test, but not for purposes of the 75% gross income test. Any dividends that we receive from a REIT, however, will be qualifying income for purposes of both the 95% and 75% gross income tests.

REMIC interest apportionment. The interest apportionment tax rules provide that, if a mortgage is secured by both real property and other property, the REIT is required to apportion its annual interest income between the portion attributable to a mortgage on the real property and the portion attributable to other property (which is not treated as mortgage interest). The interest apportionment tax regulations apply only if the mortgage loan in question is secured by both real property and other property. We expect that all or most of the mortgage loans that we acquire will be secured only by real property and no other property value is taken into account in our underwriting process.

In addition, the Internal Revenue Code provides that a regular or a residual interest in a REMIC is generally treated as a real estate asset for the purpose of the REIT asset tests, and any amount includible in our gross income with respect to such an interest is generally treated as interest on an obligation secured by a mortgage on real property for the purpose of the REIT gross income tests. If, however, less than 95% of the assets of a REMIC in which we hold an interest consist of real estate assets (determined as if we held such assets), we will be treated as receiving directly our proportionate share of the income of the REMIC for the purpose of determining the amount of income from the REMIC that is treated as interest on an obligation secured by a mortgage on real property. In connection with the recently expanded HARP program, the IRS recently issued guidance providing that, among other things, if a REIT holds a regular interest in an "eligible REMIC," or a residual interest in an "eligible REMIC" that informs the REIT that at least 80% of the REMIC's assets constitute real estate assets, then the REIT may treat 80% of the gross income received with respect to the interest in the REMIC as interest on an obligation secured by a mortgage on real property for the purpose of the 75% gross income test. For this purpose, a REMIC is an "eligible REMIC" if: (i) the REMIC has received a guarantee from the FNMA or the FHLMC that will allow the REMIC to make any principal and interest payments on its regular and residual interests; and (ii) all of the REMIC's mortgages and pass-through certificates are secured by interests in single-family dwellings. If we were to acquire an interest in an eligible REMIC less than 95% of the assets of which constitute real estate assets, the IRS guidance described above may generally allow us to treat 80% of the gross income derived from the interest as qualifying income for the purposes of 75% REIT gross income test. Although the portion of the income from such a REMIC interest that does not qualify would likely be qualifying income for the purpose of the 95% REIT gross income test, the remaining 20% of the REMIC interest generally would not qualify as a real estate asset, which could adversely affect our ability to satisfy the REIT asset tests.

Fee income. Fees will generally be qualifying income for purposes of both the 75% and 95% gross income tests if they are received in consideration for entering into an agreement to make a loan secured by real property and the fees are not determined by income and profits. Other fees generally will not be qualifying income for purposes of either gross income test. Any fees earned by a TRS will not be included for purposes of the gross income tests.

Hedging transactions. Any income or gain that we or our pass-through subsidiaries derive from instruments that hedge certain risks, such as the risk of changes in interest rates, will be excluded from gross income for purposes of both the 75% and 95% gross income tests, provided that specified requirements are met, including the requirement that the instrument is entered into during the ordinary course of our business, the instrument hedges risks associated with indebtedness issued by us or our pass-through subsidiary that is incurred to acquire or carry "real estate assets" (as described below under "—Asset tests"), and the instrument is properly identified as a hedge along with the risk that it hedges within prescribed time periods. Income and gain from all other hedging transactions will not be qualifying income for either the 95% or 75% gross income test.

Failure to satisfy the gross income tests. If we fail to satisfy one or both of the 75% or 95% gross income tests for any taxable year, including as a result of income and gains from the disposition of TBAs, we may still qualify as a REIT for such year if we are entitled to relief under applicable provisions of the Internal Revenue Code. These relief provisions will be generally available if: (i) our failure to meet these tests was due to reasonable cause and not due to willful neglect; and (ii) following our identification of the failure to meet the 75% or 95% gross income test for any taxable year, we file a schedule with the IRS setting forth each item of our gross income for purposes of the 75% or 95% gross income test for such taxable year in accordance with Treasury regulations yet to be issued. It is not possible to state whether we would be entitled to the benefit of these relief provisions in all circumstances. If these relief provisions are inapplicable to a particular set of circumstances, we will not qualify as a REIT. Even where these relief provisions apply, the Internal Revenue Code imposes a tax based upon the amount by which we fail to satisfy the particular gross income test.

Timing differences between receipt of cash and recognition of income. Due to the nature of the assets in which we will invest, we may be required to recognize taxable income from those assets in advance of our receipt of cash flow on or proceeds from disposition of such assets, and may be required to report taxable income in early periods that exceeds the economic income ultimately realized on such assets.

We may acquire mortgage-backed securities in the secondary market for less than their face amount. In addition, pursuant to our ownership of certain mortgage-backed securities, we may be treated as holding certain debt instruments acquired in the secondary market for less than their face amount. The discount at which such securities or debt instruments are acquired may reflect doubts about their ultimate collectability rather than current market interest rates. The amount of such discount may nevertheless generally be treated as "market discount" for U.S. federal income tax purposes. Accrued market discount is generally recognized as income when, and to the extent that, any payment of principal on the mortgage-backed security or debt instrument is made. If we collect less on the mortgage-backed security or debt instrument than our purchase price plus the market discount we had previously reported as income, we may not be able to benefit from any offsetting loss deductions.

Moreover, some of the mortgage-backed securities that we acquire may have been issued with original issue discount. In general, we will be required to accrue original issue discount based on the constant yield to maturity of the securities, and to treat it as taxable income in accordance with applicable U.S. federal income tax rules even though smaller or no cash payments are received on such securities. As in the case of the market discount discussed in the preceding paragraph, the constant yield in question will be determined and we will be taxed based on the assumption that all future payments due on the mortgage-backed securities in question will be made, with consequences similar to those described in the previous paragraph if all payments on the securities are not made.

In addition, pursuant to our ownership of certain mortgage-backed securities, we may be treated as holding distressed debt investments that are subsequently modified by agreement with the borrower. If the amendments to the outstanding debt are "significant modifications" under the applicable Treasury regulations, the modified debt may be considered to have been reissued to us in a debt-for-debt

exchange with the borrower. In that event, we may be required to recognize taxable gain to the extent the principal amount of the modified debt exceeds our adjusted tax basis in the unmodified debt, even if the value of the debt or the payment expectations have not changed. Following such a taxable modification, we would hold the modified loan with a cost basis equal to its principal amount for U.S. federal tax purposes. To the extent that such modifications are made with respect to a debt instrument held by a TRS that is treated as a dealer or trader and that makes an election to use mark-to-market accounting, such TRS would be required at the end of each taxable year, including the taxable year in which any such modification were made, to mark the modified debt instrument to its fair market value as if the debt instrument were sold. In that case, the TRS could recognize a loss at the end of the taxable year in which the modifications were made to the extent that the fair market value of such debt instrument at such time was less than the instrument's tax basis.

In addition, in the event mortgage-backed securities, or any debt instruments we are treated as holding pursuant to our investments in mortgage-backed securities, are delinquent as to mandatory principal and interest payments, we may nonetheless be required to continue to recognize the unpaid interest as taxable income as it accrues, despite doubt as to its ultimate collectability. Similarly, we may be required to accrue interest income with respect to subordinate mortgage-backed securities at the stated rate regardless of whether corresponding cash payments are received.

Finally, we may be required under the terms of indebtedness that we incur to use cash received from interest payments to make principal payments on that indebtedness, with the effect of recognizing income but not having a corresponding amount of cash available for distribution to our stockholders.

Due to each of these potential timing differences between income recognition or expense deduction and cash receipts or disbursements, there is a significant risk that we may have substantial taxable income in excess of cash available for distribution. In that event, we may need to borrow funds or take other action to satisfy the REIT distribution requirements for the taxable year in which this "phantom income" is recognized. See "—Annual distribution requirements."

At the close of each calendar quarter, we must also satisfy four tests relating to the nature of our assets. First, at least 75% of the value of our total assets must be represented by some combination of "real estate assets," cash, cash items, U.S. government securities, and, under some circumstances, stock or debt instruments purchased with new capital. For this purpose, real estate assets include some kinds of mortgage-backed securities and mortgage loans, as well as interests in real property and stock of other corporations that qualify as REITs. Assets that do not qualify for purposes of the 75% asset test are subject to the additional asset tests described below.

Second, the value of any one issuer's securities that we own may not exceed 5% of the value of our total assets.

Third, we may not own more than 10% of any one issuer's outstanding securities, as measured by either voting power or value. The 5% and 10% asset tests do not apply to securities of TRSs and qualified REIT subsidiaries and the 10% asset test does not apply to "straight debt" having specified characteristics and to certain other securities described below. Solely for purposes of the 10% asset test, the determination of our interest in the assets of a partnership or limited liability company in which we own an interest will be based on our proportionate interest in any securities issued by the partnership or limited liability company, excluding for this purpose certain securities described in the Internal Revenue Code.

Fourth, the aggregate value of all securities of TRSs that we hold may not exceed 25% of the value of our total assets.

Notwithstanding the general rule, as noted above, that for purposes of the REIT income and asset tests we are treated as owning our proportionate share of the underlying assets of a subsidiary partnership, if we hold indebtedness issued by a partnership, the indebtedness will be subject to, and may cause a violation of, the asset tests unless the indebtedness is a qualifying mortgage asset or other conditions are met. Similarly, although stock of another REIT is a qualifying asset for purposes of the REIT asset tests, any non-mortgage debt that is issued by another REIT may not so qualify (such debt, however, will not be treated as "securities" for purposes of the 10% asset test, as explained below).

Certain securities will not cause a violation of the 10% asset test described above. Such securities include instruments that constitute "straight debt," which includes, among other things, securities having certain contingency features. A security does not qualify as "straight debt" where a REIT (or a controlled TRS of the REIT) owns other securities of the same issuer which do not qualify as straight debt, unless the value of those other securities constitute, in the aggregate, 1% or less of the total value of that issuer's outstanding securities. In addition to straight debt, the Internal Revenue Code provides that certain other securities will not violate the 10% asset test. Such securities include: (i) any loan made to an individual or an estate; (ii) certain rental agreements pursuant to which one or more payments are to be made in subsequent years (other than agreements between a REIT and certain persons related to the REIT under attribution rules); (iii) any obligation to pay rents from real property; (iv) securities issued by governmental entities that are not dependent in whole or in part on the profits of (or payments made by) a non-governmental entity; (v) any security (including debt securities) issued by another REIT; and (vi) any debt instrument issued by a partnership if the partnership's income is of a nature that it would satisfy the 75% gross income test described above under "—Income tests." In applying the 10% asset test, a debt security issued by a partnership is not taken into account to the extent, if any, of the REIT's proportionate interest in the equity and certain debt securities issued by that partnership.

We invest in Agency and non-Agency mortgage-backed securities that are either mortgage pass-through certificates or CMOs. We expect that these securities will be treated either as interests in grantor trusts or as interests in REMICs for U.S. federal income tax purposes. In the case of mortgage-backed securities treated as interests in grantor trusts, we would be treated as owning an undivided beneficial ownership interest in the mortgage loans held by the grantor trust. Such mortgage loans will generally qualify as real estate assets to the extent that they are secured by real property. We expect that substantially all of our mortgage-backed securities treated as interests in grantor trusts will qualify as real estate assets.

In the case of mortgage-backed securities treated as interests in a REMIC, such interests will generally qualify as real estate assets. If less than 95% of the assets of a REMIC are real estate assets, however, then only a proportionate part of our interest in the REMIC and income derived from the interest will qualify for purposes of the REIT asset tests. In connection with the recently expanded HARP program, the IRS recently issued guidance providing that, among other things, if a REIT holds a regular interest in an "eligible REMIC," or a residual interest in an "eligible REMIC" that informs the REIT that at least 80% of the REMIC's assets constitute real estate assets, then the REIT may treat 80% of the value of the interest in the REMIC as a real estate asset for the purpose of the REIT asset tests. For this purpose, a REMIC is an "eligible REMIC" if: (i) the REMIC has received a guarantee from the FNMA or the FHLMC that will allow the REMIC to make any principal and interest payments on its regular and residual interests; and (ii) all of the REMIC's mortgages and pass-through certificates are secured by interests in single-family dwellings. If we were to acquire an interest in an eligible REMIC less than 95% of the assets of which constitute real estate assets, the IRS guidance described above may generally allow us to treat 80% of our interest in such a REMIC as a qualifying real estate asset for the purpose of the REIT asset tests. The remaining 20% of the REMIC interest generally would not qualify as a real estate asset, which could adversely affect our ability to satisfy the REIT asset tests.

If we hold a "residual interest" in a REMIC from which we derive "excess inclusion income," we will be required to either distribute the excess inclusion income or pay tax on it (or a combination of the two), even though we may not receive the income in cash. To the extent that distributed excess inclusion income is allocable to a particular stockholder, the income: (i) would not be allowed to be offset by any net operating losses otherwise available to the stockholder; (ii) would be subject to tax as unrelated business taxable income in the hands of most types of stockholders that are otherwise generally exempt from U.S. federal income tax; and (iii) would result in the application of U.S. federal income tax withholding at the maximum rate (30%), without reduction pursuant to any otherwise applicable income tax treaty or other exemption, to the extent allocable to most types of foreign stockholders. Moreover, any excess inclusion income that we receive that is allocable to specified categories of tax-exempt investors which are not subject to unrelated business income tax, such as government entities or charitable remainder trusts, may be subject to corporate-level income tax in our hands, whether or not it is distributed.

We enter into sale and repurchase agreements under which we nominally sell certain of our mortgage-backed securities to a counterparty and simultaneously enter into an agreement to repurchase the sold assets in exchange for a purchase price that reflects a financing charge. Economically, these agreements are financings, which are secured by the securities "sold" pursuant thereto. We believe that we will be treated for REIT asset and income test purposes as the owner of the securities that are the subject of any such agreement notwithstanding that such agreements may transfer record ownership of the assets to the counterparty during the term of the agreement. It is possible, however, that the IRS could assert that we did not own the mortgage-backed securities during the term of the sale and repurchase agreement, in which case we could fail to qualify as a REIT.

We may purchase Agency RMBS through TBAs. There is no direct authority with respect to the qualification of TBAs as real estate assets or Government securities for purposes of the 75% asset test. Consequently, our ability to purchase TBAs could be limited. No assurances can be given that the IRS will treat TBAs as qualifying assets. We do not expect that a significant portion of our assets will be comprised of TBAs, and therefore we do not expect any TBAs to adversely affect our ability to meet the 75% asset test. In the event that TBAs were determined not to be qualifying for the 75% asset test, we could be subject to a penalty tax or we could fail to qualify as a REIT if such assets when added to any other non-qualifying assets exceeded 25% of our gross assets.

No independent appraisals have been obtained to support our conclusions as to the value of our total assets or the value of any particular security or securities. Moreover, values of some assets, including instruments issued in securitization transactions, may not be susceptible to a precise determination, and values are subject to change in the future. Furthermore, the proper classification of an instrument as debt or equity for U.S. federal income tax purposes may be uncertain in some circumstances, which could affect the application of the REIT asset requirements. Accordingly, there can be no assurance that the IRS will not contend that our interests in our subsidiaries or in the securities of other issuers will not cause a violation of the REIT asset tests.

However, certain relief provisions are available to allow REITs to satisfy the asset requirements or to maintain REIT qualification notwithstanding certain violations of the asset and other requirements. One such provision allows a REIT which fails one or more of the asset requirements to nevertheless maintain its REIT qualification if: (i) the REIT provides the IRS with a description of each asset causing the failure; (ii) the failure is due to reasonable cause and not willful neglect; (iii) the REIT pays a tax equal to the greater of (a) $50,000 per failure, and (b) the product of the net income generated by the assets that caused the failure multiplied by the highest applicable corporate tax rate (currently 35%); and (iv) the REIT either disposes of the assets causing the failure within six months after the last day of the quarter in which it identifies the failure, or otherwise satisfies the relevant asset tests within that time frame.

In the case of de minimis violations of the 10% and 5% asset tests, a REIT may maintain its qualification despite a violation of such requirements if: (i) the value of the assets causing the violation does not exceed the lesser of 1% of the REIT's total assets and $10,000,000; and (ii) the REIT either disposes of the assets causing the failure within six months after the last day of the quarter in which it identifies the failure, or the relevant tests are otherwise satisfied within that time frame.

If we should fail to satisfy the asset tests at the end of a calendar quarter, including any failure to satisfy the 75% asset test as a result of any investments in TBAs, such a failure would not cause us to lose our REIT qualification if we: (i) satisfied the asset tests at the close of the preceding calendar quarter; and (ii) the discrepancy between the value of our assets and the asset requirements was not wholly or partly caused by an acquisition of non-qualifying assets, but instead arose from changes in the market value of our assets. If the condition described in (ii) were not satisfied, we still could avoid disqualification by eliminating any discrepancy within 30 days after the close of the calendar quarter in which it arose or by making use of relief provisions described below.

In order to qualify as a REIT, we are required to distribute dividends, other than capital gain dividends, to our stockholders in an amount at least equal to:

We generally must make these distributions in the taxable year to which they relate, or in the following taxable year if declared before we timely file our tax return for the year and if paid with or before the first regular dividend payment after such declaration. In order for distributions to be counted as satisfying the annual distribution requirements for REITs, and to provide us with a REIT-level tax deduction, the distributions must not be "preferential dividends." A dividend is not a preferential dividend if the distribution is: (i) pro rata among all outstanding shares of stock within a particular class; and (ii) in accordance with the preferences among different classes of stock as set forth in our organizational documents.

To the extent that we distribute at least 90%, but less than 100%, of our net taxable income, as adjusted, we will be subject to tax at ordinary corporate tax rates on the retained portion. We may elect to retain, rather than distribute, our net long-term capital gains and pay tax on such gains. In this case, we could elect for our stockholders to include their proportionate shares of such undistributed long-term capital gains in income, and to receive a corresponding credit for their share of the tax that we paid. Our stockholders would then increase their adjusted basis of their stock by the difference between: (a) the amounts of capital gain dividends that we designated and that they include in their taxable income, minus (b) the tax that we paid on their behalf with respect to that income.

To the extent that in the future we may have available net operating losses carried forward from prior tax years, such losses may reduce the amount of distributions that we must make in order to comply with the REIT distribution requirements. Such losses, however, will generally not affect the character, in the hands of our stockholders, of any distributions that are actually made as ordinary dividends or capital gains. See "—Taxation of stockholders—Taxation of taxable domestic stockholders—Distributions."

If we fail to distribute during each calendar year at least the sum of: (i) 85% of our REIT ordinary income for such year; (ii) 95% of our REIT capital gain net income for such year; and (iii) any undistributed net taxable income from prior periods, we will be subject to a non-deductible 4% excise tax on the excess of such required distribution over the sum of: (a) the amounts actually distributed, plus; (b) the amounts of income we retained and on which we have paid corporate income tax.

As discussed above under "—Income tests—Timing differences between receipt of cash and recognition of income," it is possible that, from time to time, we may not have sufficient cash to meet the distribution requirements due to timing differences between our actual receipt of cash and our inclusion of items in income for U.S. federal income tax purposes. In the event that such timing differences occur, in order to meet the distribution requirements, it might be necessary for us to arrange for short-term, or possibly long-term, borrowings, or to pay dividends in the form of taxable in-kind distributions of property. Alternatively, we may declare a taxable dividend payable in cash or stock at the election of each stockholder, where the aggregate amount of cash to be distributed in such dividend may be subject to limitation. In such case, for U.S. federal income tax purposes, taxable stockholders receiving such dividends will be required to include the full amount of the dividend as ordinary income to the extent of our current and accumulated earnings and profits.

We may be able to rectify a failure to meet the distribution requirements for a year by paying "deficiency dividends" to stockholders in a later year, which may be included in our deduction for dividends paid for the earlier year. In this case, we may be able to avoid losing REIT qualification or being taxed on amounts distributed as deficiency dividends. We will be required to pay interest based on the amount of any deduction taken for deficiency dividends.

Net income that we derive from a prohibited transaction is subject to a 100% tax. The term "prohibited transaction" generally includes a sale or other disposition of property (other than foreclosure property, as discussed below) that is held primarily for sale to customers in the ordinary course of a trade or business by us or by a borrower that has issued a shared appreciation mortgage or similar debt instrument to us. We conduct our operations so that no asset that we own (or are treated as owning) will be treated as, or as having been, held for sale to customers, and that a sale of any such asset will not be treated as having been in the ordinary course of our business. Whether property is held "primarily for sale to customers in the ordinary course of a trade or business" depends on the particular facts and circumstances. No assurance can be given that any property that we sell will not be treated as property held for sale to customers, or that we can comply with certain safe-harbor provisions of the Internal Revenue Code that would prevent such treatment. The 100% tax does not apply to gains from the sale of property that is held through a TRS or other taxable corporation, although such income will be subject to tax in the hands of the corporation at regular corporate rates. We structure our activities to avoid prohibited transaction characterization.

Foreclosure property is real property and any personal property incident to such real property: (i) that we acquire as the result of having bid in the property at foreclosure, or having otherwise reduced the property to ownership or possession by agreement or process of law, after a default (or upon imminent default) on a lease of the property or a mortgage loan held by us and secured by the property; (ii) for which we acquired the related loan or lease at a time when default was not imminent or anticipated; and (iii) with respect to which we made a proper election to treat the property as foreclosure property. We generally will be subject to tax at the maximum corporate rate (currently 35%) on any net income from foreclosure property, including any gain from the disposition of the foreclosure property, other than income that would otherwise be qualifying income for purposes of the

75% gross income test. Any gain from the sale of property for which a foreclosure property election has been made will not be subject to the 100% tax on gains from prohibited transactions described above, even if the property would otherwise constitute inventory or dealer property. Because we will invest primarily in mortgage-backed securities, we do not anticipate receiving any income from foreclosure property that does not qualify for purposes of the 75% gross income test.

We may enter into hedging transactions with respect to interest rate exposure on one or more of our assets or liabilities. Any such hedging transactions could take a variety of forms, including the use of derivative instruments such as interest rate swap contracts, interest rate cap or floor contracts, futures or forward contracts, and options. Except to the extent provided by Treasury regulations, any income from a hedging transaction we enter into: (i) in the normal course of our business primarily to manage risk of interest rate changes or currency fluctuations with respect to borrowings made or to be made, or ordinary obligations incurred or to be incurred, to acquire or carry real estate assets, which is clearly identified as specified in Treasury regulations before the close of the day on which it was acquired, originated, or entered into, including gain from the sale or disposition of such a transaction; and (ii) primarily to manage risk of currency fluctuations with respect to any item of income or gain that would be qualifying income under the 75% or 95% income tests which is clearly identified as such before the close of the day on which it was acquired, originated, or entered into, will not constitute gross income for purposes of the 75% or 95% gross income test. To the extent that we enter into other types of hedging transactions, the income from those transactions is likely to be treated as non-qualifying income for purposes of both of the 75% and 95% gross income tests. We structure any hedging transactions in a manner that does not jeopardize our qualification as a REIT. We may conduct some or all of our hedging activities (including hedging activities relating to currency risk) through a TRS or other corporate entity, the income from which may be subject to U.S. federal income tax, rather than by participating in the arrangements directly or through pass-through subsidiaries. No assurance can be given, however, that our hedging activities will not give rise to income that does not qualify for purposes of either or both of the REIT gross income tests, or that our hedging activities will not adversely affect our ability to satisfy the REIT qualification requirements.

An entity, or a portion of an entity, may be classified as a taxable mortgage pool, or TMP, under the Internal Revenue Code if

Under regulations issued by the Treasury, if less than 80% of the assets of an entity (or a portion of an entity) consist of debt obligations, these debt obligations are considered not to comprise "substantially all" of its assets, and therefore the entity would not be treated as a TMP. Our financing and securitization arrangements may give rise to TMPs, with the consequences as described below.

Where an entity, or a portion of an entity, is classified as a TMP, it is generally treated as a taxable corporation for U.S. federal income tax purposes. In the case of a REIT, or a portion of a REIT, or a disregarded subsidiary of a REIT, that is a TMP, however, special rules apply. The TMP is

not treated as a corporation that is subject to corporate income tax, and the TMP classification does not adversely affect the qualification of the REIT. Rather, the consequences of the TMP classification would, in general, except as described below, be limited to the stockholders of the REIT.

A portion of the REIT's income from the TMP arrangement could be treated as "excess inclusion income." The REIT's excess inclusion income, including any excess inclusion income from a residual interest in a REMIC, must be allocated among its stockholders in proportion to dividends paid. The REIT is required to notify stockholders of the amount of "excess inclusion income" allocated to them. A stockholder's share of excess inclusion income:

See "—Taxation of stockholders." To the extent that excess inclusion income is allocated to a tax-exempt stockholder of a REIT that is not subject to unrelated business income tax (such as a government entity or charitable remainder trust), the REIT may be subject to tax on this income at the highest applicable corporate tax rate (currently 35%). In that case, the REIT could reduce distributions to such stockholders by the amount of such tax paid by the REIT attributable to such stockholder's ownership. Treasury regulations provide that such a reduction in distributions does not give rise to a preferential dividend that could adversely affect the REIT's compliance with its distribution requirements. See "—Annual distribution requirements." The manner in which excess inclusion income is calculated, or would be allocated to stockholders, including allocations among shares of different classes of stock, is not clear under current law. As required by IRS guidance, we intend to make such determinations using a reasonable method. Tax-exempt investors, foreign investors and taxpayers with net operating losses should carefully consider the tax consequences described above, and are urged to consult their tax advisors.

If a subsidiary partnership of ours that we do not wholly-own, directly or through one or more disregarded entities, were a TMP, the foregoing rules would not apply. Rather, the partnership that is a TMP would be treated as a corporation for U.S. federal income tax purposes, and potentially would be subject to corporate income tax or withholding tax. In addition, this characterization would alter our income and asset test calculations, and could adversely affect our compliance with those requirements. We intend to monitor the structure of any TMPs in which we have an interest to ensure that they will not adversely affect our qualification as a REIT.

Investments in asset-backed securities, or ABS, generally are not qualifying assets for purposes of the 75% asset test applicable to REITs and generally do not generate qualifying income for purposes of the 75% income test applicable to REITs. As a result, we may be limited in our ability to invest in such assets.

If we fail to satisfy one or more requirements for REIT qualification other than the income or asset tests, we could avoid disqualification if our failure is due to reasonable cause and not to willful neglect and we pay a penalty of $50,000 for each such failure. Relief provisions are available for failures of the income tests and asset tests, as described above in "—Income tests" and "—Asset tests."

If we fail to qualify for taxation as a REIT in any taxable year, and the relief provisions described above do not apply, we would be subject to tax, including any applicable alternative minimum tax, on our taxable income at regular corporate rates. We cannot deduct distributions to stockholders in any year in which we are not a REIT, nor would we be required to make distributions in such a year. In this situation, to the extent of current and accumulated earnings and profits, distributions to most domestic stockholders that are U.S. individuals, trusts and estates will generally be taxable at the preferential income tax rates (i.e., the 20% maximum federal rate) for qualified dividends. In addition, subject to the limitations of the Internal Revenue Code, corporate distributees may be eligible for the dividends received deduction. Unless we are entitled to relief under specific statutory provisions, we would also be disqualified from re-electing to be taxed as a REIT for the four taxable years following the year during which we lost qualification. It is not possible to state whether, in all circumstances, we would be entitled to this statutory relief.

Distributions. So long as we qualify as a REIT, the distributions that we make to our taxable domestic stockholders out of current or accumulated earnings and profits that we do not designate as capital gain dividends will generally be taken into account by stockholders as ordinary income and will not be eligible for the dividends received deduction for corporations. With limited exceptions, our dividends are not eligible for taxation at the preferential income tax rates (i.e., the 20% maximum U.S. federal rate) for qualified dividends received by most domestic stockholders that are individuals, trusts and estates from taxable C corporations. Such stockholders, however, are taxed at the preferential rates on dividends designated by and received from REITs to the extent that the dividends are attributable to:

Distributions that we designate as capital gain dividends will generally be taxed to our stockholders as long-term capital gains, to the extent that such distributions do not exceed our actual net capital gain for the taxable year, without regard to the period for which the stockholder that receives such distribution has held its stock. We may elect to retain and pay taxes on some or all of our net long-term capital gains, in which case provisions of the Internal Revenue Code will treat our stockholders as having received, solely for tax purposes, our undistributed capital gains, and the stockholders will receive a corresponding credit for taxes that we paid on such undistributed capital gains. See "Taxation of Western Asset Mortgage Capital Corporation—Annual distribution requirements." Corporate stockholders may be required to treat up to 20% of some capital gain dividends as ordinary income. Long-term capital gains are generally taxable at maximum U.S. federal rates of 20% in the case of stockholders that are individuals, trusts and estates, and 35% in the case of stockholders that are corporations. Capital gains attributable to the sale of depreciable real property held for more than 12 months are subject to a 25% maximum U.S. federal income tax rate for taxpayers who are taxed as individuals, to the extent of previously claimed depreciation deductions.

Distributions in excess of our current and accumulated earnings and profits will generally represent a return of capital and will not be taxable to a stockholder to the extent that the amount of such distributions does not exceed the adjusted basis of the stockholder's shares in respect of which the

distributions were made. Rather, the distribution will reduce the adjusted basis of the stockholder's shares. To the extent that such distributions exceed the adjusted basis of a stockholder's shares, the stockholder generally must include such distributions in income as long-term capital gain, or short-term capital gain if the shares have been held for one year or less. In addition, any dividend that we declare in October, November or December of any year and that is payable to a stockholder of record on a specified date in any such month will be treated as both paid by us and received by the stockholder on December 31 of such year, provided that we actually pay the dividend before the end of January of the following calendar year.

To the extent that we have available net operating losses and capital losses carried forward from prior tax years, such losses may reduce the amount of distributions that we must make in order to comply with the REIT distribution requirements. See "Taxation of Western Asset Mortgage Capital Corporation—Annual distribution requirements." Such losses, however, are not passed through to stockholders and do not offset income of stockholders from other sources, nor would such losses affect the character of any distributions that we make, which are generally subject to tax in the hands of stockholders to the extent that we have current or accumulated earnings and profits.

Dispositions of Western Asset Mortgage Capital Corporation stock. In general, capital gains recognized by individuals, trusts and estates upon the sale or disposition of our stock will be subject to a maximum U.S. federal income tax rate of 20% if the stock is held for more than one year, and will be taxed at ordinary income rates (of up 39.6%) if the stock is held for one year or less. Gains recognized by stockholders that are corporations are subject to U.S. federal income tax at a maximum rate of 35%, whether or not such gains are classified as long-term capital gains. Capital losses recognized by a stockholder upon the disposition of our stock that was held for more than one year at the time of disposition will be considered long-term capital losses, and are generally available only to offset capital gain income of the stockholder but not ordinary income (except in the case of individuals, who may offset up to $3,000 of ordinary income each year). In addition, any loss upon a sale or exchange of shares of our stock by a stockholder who has held the shares for six months or less, after applying holding period rules, will be treated as a long-term capital loss to the extent of distributions that we make that are required to be treated by the stockholder as long-term capital gain.

If an investor recognizes a loss upon a subsequent disposition of our stock or other securities in an amount that exceeds a prescribed threshold, it is possible that the provisions of Treasury regulations involving "reportable transactions" could apply, with a resulting requirement to separately disclose the loss-generating transaction to the IRS. These regulations, though directed towards "tax shelters," are broadly written and apply to transactions that would not typically be considered tax shelters. The Internal Revenue Code imposes significant penalties for failure to comply with these requirements. You should consult your tax advisor concerning any possible disclosure obligation with respect to the receipt or disposition of our stock or securities or transactions that we might undertake directly or indirectly. Moreover, you should be aware that we and other participants in the transactions in which we are involved (including their advisors) might be subject to disclosure or other requirements pursuant to these regulations.

Passive activity losses and investment interest limitations. Distributions that we make and gain arising from the sale or exchange by a domestic stockholder of our stock will not be treated as passive activity income. As a result, stockholders will not be able to apply any "passive losses" against income or gain relating to our stock. To the extent that distributions we make do not constitute a return of capital, they will be treated as investment income for purposes of computing the investment interest limitation.

The following is a summary of certain U.S. federal income and estate tax consequences of the ownership and disposition of our stock applicable to non-U.S. stockholders. A "non-U.S. stockholder" is any person other than:

If a partnership, including for this purpose any entity that is treated as a partnership for U.S. federal income tax purposes, holds our common stock, the tax treatment of a partner in the partnership will generally depend upon the status of the partner and the activities of the partnership. An investor that is a partnership and the partners in such partnership should consult their tax advisors about the U.S. federal income tax consequences of the acquisition, ownership and disposition of our common stock.

The following discussion is based on current law, and is for general information only. It addresses only selected, and not all, aspects of U.S. federal income and estate taxation.

Ordinary dividends. The portion of dividends received by non-U.S. stockholders that is: (i) payable out of our earnings and profits; (ii) which is not attributable to our capital gains; and (iii) which is not effectively connected with a U.S. trade or business of the non-U.S. stockholder, will be subject to U.S. withholding tax at the rate of 30%, unless reduced or eliminated by treaty.

In general, non-U.S. stockholders will not be considered to be engaged in a U.S. trade or business solely as a result of their ownership of our stock. In cases where the dividend income from a non-U.S. stockholder's investment in our stock is, or is treated as, effectively connected with the non-U.S. stockholder's conduct of a U.S. trade or business, the non-U.S. stockholder generally will be subject to U.S. federal income tax at graduated rates, in the same manner as domestic stockholders are taxed with respect to such dividends. Such income must generally be reported on a U.S. income tax return filed by or on behalf of the non-U.S. stockholder. The income may also be subject to the 30% branch profits tax in the case of a non-U.S. stockholder that is a corporation.

Non-dividend distributions. Unless our stock constitutes a U.S. real property interest (a "USRPI"), distributions that we make which are not dividends out of our earnings and profits will not be subject to U.S. income tax. If we cannot determine at the time a distribution is made whether or not the distribution will exceed current and accumulated earnings and profits, the distribution will be subject to withholding at the rate applicable to dividends. The non-U.S. stockholder may seek a refund from the IRS of any amounts withheld if it is subsequently determined that the distribution was, in fact, in excess of our current and accumulated earnings and profits. If our stock constitutes a USRPI, as described below, distributions that we make in excess of the sum of: (a) the stockholder's proportionate share of our earnings and profits, plus (b) the stockholder's basis in its stock, will be taxed under the Foreign Investment in Real Property Tax Act of 1980, or FIRPTA, at the rate of tax, including any applicable capital gains rates, that would apply to a domestic stockholder of the same type (e.g., an individual or a corporation, as the case may be), and the collection of the tax will be enforced by a withholding at a

rate of 10% of the amount by which the distribution exceeds the stockholder's share of our earnings and profits.

Capital gain dividends. Under FIRPTA, a distribution that we make to a non-U.S. stockholder, to the extent attributable to gains from dispositions of USRPIs that we held directly or through pass-through subsidiaries, or USRPI capital gains, will, except as described below, be considered effectively connected with a U.S. trade or business of the non-U.S. stockholder and will be subject to U.S. income tax at the rates applicable to U.S. individuals or corporations, without regard to whether we designate the distribution as a capital gain dividend. See above under "—Taxation of foreign stockholders—Ordinary dividends," for a discussion of the consequences of income that is effectively connected with a U.S. trade or business. In addition, we will be required to withhold tax equal to 35% of the maximum amount that could have been designated as USRPI capital gains dividends. Distributions subject to FIRPTA may also be subject to a 30% branch profits tax in the hands of a non-U.S. stockholder that is a corporation. A distribution is not attributable to USRPI capital gain if we held an interest in the underlying asset solely as a creditor. Capital gain dividends received by a non-U.S. stockholder that are attributable to dispositions of our assets other than USRPIs are not subject to U.S. federal income or withholding tax, unless: (i) the gain is effectively connected with the non-U.S. stockholder's U.S. trade or business, in which case the non-U.S. stockholder would be subject to the same treatment as U.S. holders with respect to such gain; or (ii) the non-U.S. stockholder is a nonresident alien individual who was present in the United States for 183 days or more during the taxable year and has a "tax home" in the United States, in which case the non-U.S. stockholder will incur a 30% tax on his capital gains. We do not expect that a significant portion of our assets will be USRPIs.

A capital gain dividend that would otherwise have been treated as a USRPI capital gain will not be so treated or be subject to FIRPTA, and generally will not be treated as income that is effectively connected with a U.S. trade or business, and instead will be treated in the same manner as an ordinary dividend (see "—Taxation of foreign stockholders—Ordinary dividends"), if: (i) the capital gain dividend is received with respect to a class of stock that is regularly traded on an established securities market located in the United States; and (ii) the recipient non-U.S. stockholder does not own more than 5% of that class of stock at any time during the year ending on the date on which the capital gain dividend is received. We anticipate that our common stock will be "regularly traded" on an established securities exchange.

Dispositions of Western Asset Mortgage Capital Corporation stock. Unless our stock constitutes a USRPI, a sale of our stock by a non-U.S. stockholder generally will not be subject to U.S. taxation under FIRPTA. Our stock will be treated as a USRPI if 50% or more of our assets throughout a prescribed testing period consist of interests in real property located within the United States, excluding, for this purpose, interests in real property solely in a capacity as a creditor. It is not currently anticipated that our stock will constitute a USRPI. However, we cannot assure you that our stock will not become a USRPI.

Even if the foregoing 50% test is met, our stock will not constitute a USRPI if we are a "domestically controlled qualified investment entity." A domestically controlled qualified investment entity includes a REIT, less than 50% of value of which is held directly or indirectly by non-U.S. stockholders at all times during a specified testing period. We believe that we will be and will remain a domestically controlled qualified investment entity, and that a sale of our stock should not be subject to taxation under FIRPTA. However, no assurance can be given that we will be or will remain a domestically controlled qualified investment entity.

In the event that we are not a domestically controlled qualified investment entity, but our stock is "regularly traded," as defined by applicable Treasury regulations, on an established securities market, a non-U.S. stockholder's sale of our common stock nonetheless also would not be subject to tax under

FIRPTA as a sale of a USRPI, provided that the selling non-U.S. stockholder held 5% or less of our outstanding common stock any time during the one-year period ending on the date of the sale. We expect that our common stock will be regularly traded on an established securities market.

If gain on the sale of our stock were subject to taxation under FIRPTA, the non-U.S. stockholder would be required to file a U.S. federal income tax return and would be subject to the same treatment as a domestic stockholder with respect to such gain, subject to applicable alternative minimum tax and a special alternative minimum tax in the case of non-resident alien individuals, and the purchaser of the stock could be required to withhold 10% of the purchase price and remit such amount to the IRS.

Gain from the sale of our stock that would not otherwise be subject to FIRPTA will nonetheless be taxable in the United States to a non-U.S. stockholder in two cases: (i) if the non-U.S. stockholder's investment in our stock is effectively connected with a U.S. trade or business conducted by such non-U.S. stockholder, the non-U.S. stockholder will be subject to the same treatment as a domestic stockholder with respect to such gain; or (ii) if the non-U.S. stockholder is a nonresident alien individual who was present in the United States for 183 days or more during the taxable year and has a "tax home" in the United States, the nonresident alien individual will be subject to a 30% tax on the individual's capital gain. In addition, even if we are a domestically controlled qualified investment entity, upon disposition of our stock (subject to the 5% exception applicable to "regularly traded" stock described above), a non-U.S. stockholder may be treated as having gain from the sale or exchange of a USRPI if the non-U.S. stockholder: (i) disposes of our common stock within a 30-day period preceding the ex-dividend date of a distribution, any portion of which, but for the disposition, would have been treated as gain from the sale or exchange of a USRPI; and (ii) acquires, or enters into a contract or option to acquire, other shares of our common stock within 30 days after such ex-dividend date.

Estate tax. If our stock is owned or treated as owned by an individual who is not a citizen or resident (as specially defined for U.S. federal estate tax purposes) of the United States at the time of such individual's death, the stock will be includable in the individual's gross estate for U.S. federal estate tax purposes, unless an applicable estate tax treaty provides otherwise, and may therefore be subject to U.S. federal estate tax.

Foreign stockholders are urged to consult their tax advisors regarding the U.S. federal, state, local and foreign income and other tax consequences of owning Western Asset Mortgage Capital Corporation stock.

Tax-exempt entities, including qualified employee pension and profit sharing trusts and individual retirement accounts, generally are exempt from U.S. federal income taxation. However, they may be subject to taxation on their unrelated business taxable income ("UBTI"). While some investments in real estate may generate UBTI, the IRS has ruled that dividend distributions from a REIT to a tax-exempt entity do not constitute UBTI. Based on that ruling, and provided that: (i) a tax-exempt stockholder has not held our stock as "debt financed property" within the meaning of the Internal Revenue Code (i.e., where the acquisition or holding of the property is financed through a borrowing by the tax-exempt stockholder); and (ii) our stock is not otherwise used in an unrelated trade or business, distributions that we make and income from the sale of our stock generally should not give rise to UBTI to a tax-exempt stockholder.

Tax-exempt stockholders that are social clubs, voluntary employee benefit associations, supplemental unemployment benefit trusts, and qualified group legal services plans exempt from U.S. federal income taxation under sections 501(c)(7), (c)(9), (c)(17) and (c)(20) of the Internal Revenue Code are subject to different UBTI rules, which generally require such stockholders to characterize distributions that we make as UBTI.

In certain circumstances, a pension trust that owns more than 10% of our stock could be required to treat a percentage of the dividends as UBTI if we are a "pension-held REIT." We will not be a pension-held REIT unless: (i) we are required to "look through" one or more of our pension trust stockholders in order to satisfy the REIT "closely-held" test; and (ii) either (a) one pension trust owns more than 25% of the value of our stock, or (b) one or more pension trusts, each individually holding more than 10% of the value of our stock, collectively owns more than 50% of the value of our stock. Certain restrictions on ownership and transfer of our stock generally should prevent a tax-exempt entity from owning more than 10% of the value of our stock and generally should prevent us from becoming a pension-held REIT.

Tax-exempt stockholders are urged to consult their tax advisors regarding the U.S. federal, state, local and foreign income and other tax consequences of owning Western Asset Mortgage Capital Corporation stock.

We will report to our U.S. stockholders and the IRS the amount of dividends paid during each calendar year and the amount of any tax withheld. Under the backup withholding rules, a U.S. stockholder may be subject to backup withholding with respect to dividends paid unless the holder comes within an exempt category and, when required, demonstrates this fact or provides a taxpayer identification number or social security number, certifies as to no loss of exemption from backup withholding and otherwise complies with applicable requirements of the backup withholding rules. A U.S. stockholder that does not provide his or her correct taxpayer identification number or social security number may also be subject to penalties imposed by the IRS. In addition, we may be required to withhold a portion of capital gain distributions to any U.S. stockholder who fails to certify their non-foreign status.

We must report annually to the IRS and to each non-U.S. stockholder the amount of dividends paid to such holder and the tax withheld with respect to such dividends, regardless of whether withholding was required. Copies of the information returns reporting such dividends and withholding may also be made available to the tax authorities in the country in which the non-U.S. stockholder resides under the provisions of an applicable income tax treaty. A non-U.S. stockholder may be subject to backup withholding unless applicable certification requirements are met.

Payment of the proceeds of a sale of our common stock within the U.S. is subject to both backup withholding and information reporting unless the beneficial owner certifies under penalties of perjury that it is a non-U.S. stockholder (and the payor does not have actual knowledge or reason to know that the beneficial owner is a U.S. person) or the holder otherwise establishes an exemption. Payment of the proceeds of a sale of our common stock conducted through certain U.S. related financial intermediaries is subject to information reporting (but not backup withholding) unless the financial intermediary has documentary evidence in its records that the beneficial owner is a non-U.S. stockholder and specified conditions are met or an exemption is otherwise established.

Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules may be allowed as a refund or a credit against such holder's U.S. federal income tax liability provided the required information is timely furnished to the IRS.

The present U.S. federal income tax treatment of REITs may be modified, possibly with retroactive effect, by legislative, judicial or administrative action at any time. The REIT rules are constantly under review by persons involved in the legislative process and by the IRS and the U.S. Treasury Department

which may result in statutory changes as well as revisions to regulations and interpretations. Changes to the U.S. federal tax laws and interpretations thereof could adversely affect an investment in our common stock.

Under recently enacted legislation, for taxable years beginning after December 31, 2012, certain U.S. holders who are individuals, estates or trusts and whose income exceeds certain thresholds will be required to pay a 3.8% Medicare tax on dividends and certain other investment income, including capital gains from the sale or other disposition of our common stock.

Legislation enacted in 2010 and existing guidance issued thereunder will require, after December 31, 2013, withholding at a rate of 30% on dividends in respect of, and, after December 31, 2016, gross proceeds from the sale of, our common stock held by or through certain foreign financial institutions (including investment funds), unless such institution enters into an agreement with the Treasury to report, on an annual basis, information with respect to shares in the institution held by certain U.S. persons and by certain non-U.S. entities that are wholly or partially owned by U.S. persons and to withhold on certain payments. An intergovernmental agreement between the United States and an applicable foreign country, or future Treasury regulations or other guidance, may modify these requirements. Accordingly, the entity through which our common stock is held will affect the determination of whether such withholding is required. Similarly, dividends in respect of, and gross proceeds from the sale of, our common stock held by an investor that is a non-financial non-U.S. entity will be subject to withholding at a rate of 30%, unless such entity either: (i) certifies to us that such entity does not have any "substantial United States owners" or (ii) provides certain information regarding the entity's "substantial United States owners," which we will in turn provide to the Secretary of the Treasury. We will not pay any additional amounts to stockholders in respect of any amounts withheld. Non-U.S. stockholders are encouraged to consult their tax advisors regarding the possible implications of the legislation on their investment in our common stock.

We and our subsidiaries and stockholders may be subject to state, local or foreign taxation in various jurisdictions including those in which we or they transact business, own property or reside. Our state, local or foreign tax treatment and that of our stockholders may not conform to the U.S. federal income tax treatment discussed above. Any foreign taxes that we incur do not pass through to stockholders as a credit against their U.S. federal income tax liability. Prospective investors should consult their tax advisors regarding the application and effect of state, local and foreign income and other tax laws on an investment in our stock.

We are offering the shares of common stock described in this prospectus through a number of underwriters named in the table below. are acting as joint book-running managers of the offering and are acting as representatives on behalf of the underwriters. We and our Manager have entered into an underwriting agreement with the representatives of the underwriters. Subject to the terms and conditions of the underwriting agreement, we have agreed to sell to the underwriters, and each underwriter has severally agreed to purchase, at the public offering price less the underwriting discount set forth on the cover page of this prospectus, the number of shares of common stock listed next to its name in the following table:

The underwriters are committed to purchase all the shares of common stock offered by us if they purchase any shares. The underwriting agreement also provides that if an underwriter defaults, the purchase commitments of non-defaulting underwriters may also be increased or the offering may be terminated.

The underwriters propose to offer the shares of common stock directly to the public at the offering price set forth on the cover page of this prospectus and to certain dealers at that price less a concession not in excess of $ per share. After the offering of the shares, the offering price and other selling terms may be changed by the underwriters. Sales of shares made outside of the United States may be made by affiliates of the underwriters. The underwriters have an option to buy up to additional shares of common stock from us to cover sales of shares by the underwriters which exceed the number of shares specified in the table above. The underwriters have 30 days from the date of this prospectus to exercise this option. If any shares are purchased with this option, the underwriters will purchase shares in approximately the same proportion as shown in the table above. If any additional shares of common stock are purchased, the underwriters will offer the additional shares on the same terms as those on which the shares are being offered.

The following table shows the public offering price, underwriting discount and proceeds before expenses to us. The information assumes either no exercise or full exercise by the underwriters of their option to purchase additional shares.

We estimate that the total expenses of this offering payable will be approximately $ million.

A prospectus in electronic format may be made available on the web sites maintained by one or more underwriters, or selling group members, if any, participating in the offering. The underwriters may agree to allocate a number of shares to underwriters and selling group members for sale to their online brokerage account holders. Internet distributions will be allocated by the representatives to underwriters and selling group members that may make Internet distributions on the same basis as other allocations.

We have agreed that we will not: (i) offer, pledge, announce the intention to sell, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase or otherwise dispose of, directly or indirectly, or file with the SEC a registration statement under the Securities Act relating to, any shares of our common stock or securities convertible into or exchangeable or exercisable for any shares of our common stock, or

publicly disclose the intention to make any offer, sale, pledge, disposition or filing; or (ii) enter into any swap or other arrangement that transfers all or a portion of the economic consequences associated with the ownership of any shares of common stock or any such other securities (regardless of whether any of these transactions are to be settled by the delivery of shares of common stock or such other securities, in cash or otherwise), in each case without the prior written consent of the representatives for a period of days after the date of this prospectus, other than: (a) the issuance and sale of shares of common stock in this offering, or (b) the grant of any common stock-based awards under one of our equity incentive plans. Our Manager, our directors and executive officers, and the executive officers of our Manager have entered into lock-up agreements with the underwriters prior to the commencement of this offering pursuant to which each of these persons or entities, with limited exceptions, for a period of days after the date of this prospectus, may not, without the prior written consent of the representatives, sell or transfer any shares of our common stock or any securities convertible into or exercisable or exchangeable for our common stock.

We have agreed to indemnify the underwriters against certain liabilities, including liabilities under the Securities Act.

In connection with this offering, the underwriters may engage in stabilizing transactions, which involves making bids for, purchasing and selling shares of common stock in the open market for the purpose of preventing or retarding a decline in the market price of the common stock while this offering is in progress. These stabilizing transactions may include making short sales of the common stock, which involves the sale by the underwriters of a greater number of shares of common stock than they are required to purchase in this offering, and purchasing shares of common stock on the open market to cover positions created by short sales. Short sales may be "covered" shorts, which are short positions in an amount not greater than the underwriters' option to purchase additional shares referred to above, or may be "naked" shorts, which are short positions in excess of that amount. The underwriters may close out any covered short position either by exercising their option to purchase additional shares, in whole or in part, or by purchasing shares in the open market. In making this determination, the underwriters will consider, among other things, the price of shares available for purchase in the open market compared to the price at which the underwriters may purchase shares through the option to purchase additional shares. A naked short position is more likely to be created if the underwriters are concerned that there may be downward pressure on the price of the common stock in the open market that could adversely affect investors who purchase in this offering. To the extent that the underwriters create a naked short position, they will purchase shares in the open market to cover the position.

The underwriters have advised us that, pursuant to Regulation M of the Securities Act, they may also engage in other activities that stabilize, maintain or otherwise affect the price of the common stock, including the imposition of penalty bids. These transactions may include short sales, syndicate covering transactions and stabilizing transactions. Short sales involve syndicate sales of common stock in excess of the number of shares to be purchased by the underwriters in the offering, which creates a syndicate short position. "Covered" short sales are sales of shares made in an amount up to the number of shares represented by the underwriters' option to purchase additional shares. In determining the source of shares to close out the covered syndicate short position, the underwriters will consider, among other things, the price of shares available for purchase in the open market as compared to the price at which they may purchase shares through the option to purchase additional shares. Transactions to close out the covered syndicate short involve either purchases of the common stock in the open market after the distribution has been completed or the exercise of the option to purchase additional shares. The underwriters may also make "naked" short sales of shares in excess of the option to purchase additional shares. The underwriters must close out any naked short position by purchasing shares of common stock in the open market. A naked short position is more likely to be created if the

underwriters are concerned that there may be downward pressure on the price of the shares in the open market after pricing that could adversely affect investors who purchase in the offering. Stabilizing transactions consist of bids for or purchases of shares in the open market while the offering is in progress for the purpose of pegging, fixing or maintaining the price of the securities.

In connection with any offering, the underwriters may also engage in penalty bids. Penalty bids permit the underwriters to reclaim a selling concession from a syndicate member when the securities originally sold by the syndicate member are purchased in a syndicate covering transaction to cover syndicate short positions.

These activities may have the effect of raising or maintaining the market price of the common stock or preventing or retarding a decline in the market price of the common stock, and, as a result, the price of the common stock may be higher than the price that otherwise might exist in the open market. If the underwriters commence these activities, they may discontinue them at any time. The underwriters may carry out these transactions on the NYSE, in the over-the-counter market or otherwise.

The offering price was determined by negotiations between us and the representatives of the underwriters. In determining the offering price, we and the representatives of the underwriters considered a number of factors including:

Neither we nor the underwriters can assure investors that an active trading market will develop for our shares of common stock, or that the shares will trade in the public market at or above the initial public offering price.

Other than in the United States, no action has been taken by us or the underwriters that would permit a public offering of the securities offered by this prospectus in any jurisdiction where action for that purpose is required. The securities offered by this prospectus may not be offered or sold, directly or indirectly, nor may this prospectus or any other offering material or advertisements in connection with the offer and sale of any such securities be distributed or published in any jurisdiction, except under circumstances that will result in compliance with the applicable rules and regulations of that jurisdiction. Persons into whose possession this prospectus comes are advised to inform themselves about and to observe any restrictions relating to the offering and the distribution of this prospectus. This prospectus does not constitute an offer to sell or a solicitation of an offer to buy any securities offered by this prospectus in any jurisdiction in which such an offer or a solicitation is unlawful.

This document is only being distributed to and is only directed at: (i) persons who are outside the United Kingdom; or (ii) to investment professionals falling within Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (the "Order"); or (iii) high net worth entities, and other persons to whom it may lawfully be communicated, falling within Article 49(2)(a) to (d) of the Order (all such persons together being referred to as "relevant persons"). The securities are only available to, and any invitation, offer or agreement to subscribe, purchase or otherwise acquire such securities will be engaged in only with, relevant persons. Any person who is not a relevant person should not act or rely on this document or any of its contents.

In relation to each Member State of the European Economic Area which has implemented the Prospectus Directive (each, a "Relevant Member State"), from and including the date on which the European Union Prospectus Directive (the "EU Prospectus Directive") is implemented in that Relevant Member State (the "Relevant Implementation Date") an offer of securities described in this prospectus may not be made to the public in that Relevant Member State prior to the publication of a prospectus in relation to the shares which has been approved by the competent authority in that Relevant Member State or, where appropriate, approved in another Relevant Member State and notified to the competent authority in that Relevant Member State, all in accordance with the EU Prospectus Directive, except that it may, with effect from and including the Relevant Implementation Date, make an offer of shares to the public in that Relevant Member State at any time:

For the purposes of this provision, the expression an "offer of securities to the public" in relation to any securities in any Relevant Member State means the communication in any form and by any means of sufficient information on the terms of the offer and the securities to be offered so as to enable an investor to decide to purchase or subscribe for the securities, as the same may be varied in that Member State by any measure implementing the EU Prospectus Directive in that Member State and the expression EU Prospectus Directive means Directive 2003/71/EC and includes any relevant implementing measure in each Relevant Member State.

Certain of the underwriters and their affiliates have provided in the past to us and our affiliates and may provide from time to time in the future certain commercial banking, financial advisory, investment banking and other services for us and such affiliates in the ordinary course of their business, for which they have received and may continue to receive customary fees and commissions. The underwriters or their affiliates have engaged in transactions with, and have performed underwriting, investment banking, lending and advisory services for Legg Mason and/or its affiliates in the ordinary course of their business and may do so for us as well as Legg Mason and/or its affiliates in the future. Certain of the underwriters have previously acted as financial advisors to Legg Mason and/or its affiliates and have entered into repurchase agreements, credit default swaps, equity swaps, foreign exchange contracts, guarantees or other derivative contracts with Legg Mason. They have received or will receive customary fees and reimbursements of expenses for these transactions and services. In addition, from time to time, certain of the underwriters and their affiliates may effect transactions for their own account or the account of customers, and hold on behalf of themselves or their customers, long or short positions in our debt or equity securities or loans, and may do so in the future.

Certain legal matters relating to this offering will be passed upon for us by Skadden, Arps, Slate, Meagher & Flom LLP, New York, New York. Certain legal matters relating to this offering will be passed upon for the underwriters by .

The financial statements incorporated in this Prospectus by reference to the Annual Report on Form 10-K for the year ended December 31, 2012 have been so incorporated in reliance on the report of PricewaterhouseCoopers LLP, an independent registered public accounting firm, given on the authority of said firm as experts in auditing and accounting.

We have filed with the SEC a registration statement on Form S-11, including exhibits and schedules filed with the registration statement of which this prospectus is a part, under the Securities Act, with respect to the shares of common stock to be sold in this offering. This prospectus does not contain all of the information set forth in the registration statement and exhibits and schedules to the registration statement. For further information with respect to us and the shares of common stock to be sold in this offering, reference is made to the registration statement, including the exhibits and schedules to the registration statement. Copies of the registration statement, including the exhibits and schedules to the registration statement, may be examined without charge at the public reference room of the Securities and Exchange Commission, 100 F Street, N.E., Room 1580, Washington, D.C. 20549. Information about the operation of the public reference room may be obtained by calling the SEC at 1-800-SEC-0300. Copies of all or a portion of the registration statement may be obtained from the public reference room of the SEC upon payment of prescribed fees. Our SEC filings, including our registration statement, are also available to you, free of charge, on the SEC's website at www.sec.gov.

We are subject to the information and reporting requirements of the Exchange Act and will file periodic reports, proxy statements and will make available to our stockholders annual reports containing audited financial information for each year and quarterly reports for the first three quarters of each fiscal year containing unaudited interim financial information.

The SEC allows us to "incorporate by reference" information into this prospectus which has been previously filed, which means that we can disclose important information to you by referring you to another document filed separately with the SEC. The information incorporated by reference is deemed to be part of this prospectus, except for any information superseded by information included or incorporated by reference into this prospectus. We have filed the documents listed below with the SEC (File No. 001-35543) under the Exchange Act and these documents are incorporated herein by reference:

We will provide to each person, including any beneficial owner, to whom a copy of this prospectus is delivered, a copy of any or all of the information that has been incorporated by reference into this prospectus but not delivered with this prospectus (other than the exhibits to such documents which are not specifically incorporated by reference herein); we will provide this information at no cost to the requester upon written or oral request to Western Asset Management Company, 385 East Colorado Boulevard, Pasadena, California 91101, telephone number (626) 844-9400. You may also obtain copies of this information by visiting our website at www.westernassetmcc.com.

The following table shows the fees and expenses, other than underwriting discount, to be paid by us in connection with the sale and distribution of the securities being registered hereby. All amounts except the SEC registration fee and the Financial Industry Regulatory Authority, Inc. filing fee are estimates.

On March 24, 2011, we sold 100 shares of our common stock to our Manager for a purchase price of $1,000. Such sale is exempt from the registration requirements of the Securities Act pursuant to Section 4(2) thereof.

On May 15, 2012, concurrent with the consummation of the IPO, we completed two private placements in which we sold: (i) 2,231,787 units to certain institutional accredited investors, with each unit consisting of one share of common stock and one warrant to purchase 0.5 of a share of common stock, at a price of $20.00 per unit; and (ii) 46,043 shares of common stock for $20.00 per share to the Manager's deferred compensation plan. The warrants have an initial exercise price of $20.50. The aggregate proceeds from these private offerings were approximately $44.6 million. In connection with the private placement to certain institutional accredited investors, our Manager paid the placement agent, Deutsche Bank Securities Inc., a placement agent fee of approximately $0.9 million. Such issuance and sale of units is exempt from the requirements of the Securities Act pursuant to Regulation D promulgated thereunder in that all purchasers of units are institutional "accredited investors" (as defined in paragraphs (1), (2), (3) or (7) of Rule 501(a) of Regulation D under the Securities Act). In addition, all purchasers of units are "qualified institutional buyers" (as defined in Rule 144A promulgated under the Securities Act). All purchasers of units only became interested in the private placement units through their substantive, pre-existing business relationships with our Manager and us or with an agent of the Company. No purchasers of units became interested in the private placement of the units through any public offering efforts of the Company, any of the underwriters or otherwise. Such issuance and sale of shares of common stock to our Manager's deferred compensation plan is exempt from the requirements of the Securities Act pursuant to Section 4(2) thereof.

Under the Manager Equity Plan, we granted our Manager (i) 51,159 shares of restricted common stock on May 15, 2012, and (ii) 150,000 shares of restricted common stock on March 1, 2013. Such

grants were exempt from the registration requirements of the Securities Act pursuant to Section 4(2) thereof.

Section 102 of the Delaware General Corporation Law, as amended, or the DGCL, allows a corporation to eliminate the personal liability of a director of a corporation to the corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except where the director breached his duty of loyalty to the corporation or its stockholders, failed to act in good faith, engaged in intentional misconduct or knowingly violated a law, authorized the payment of a dividend or approved a stock purchase or redemption in violation of Delaware corporate law or obtained an improper personal benefit.

Section 145 of the DGCL provides, among other things, that a corporation may indemnify any person who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding (other than an action by or in the right of the corporation) by reason of the fact that the person is or was a director, officer, employee or agent of the corporation, or is or was serving at the corporation's request as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise, against expenses, including attorneys' fees, judgments, fines and amounts paid in settlement actually and reasonably incurred by the person in connection with the action, suit or proceeding. The power to indemnify applies (i) if such person is successful on the merits or otherwise in defense of any action, suit or proceeding or (ii) if such person acted in good faith and in a manner he reasonably believed to be in or not opposed to the best interests of the corporation, and with respect to any criminal action or proceeding, had no reasonable cause to believe his conduct was unlawful. The power to indemnify applies to actions brought by or in the right of the corporation as well, but only to the extent of defense expenses, (including attorneys' fees but excluding amounts paid in settlement) actually and reasonably incurred by the indemnified person and not to any satisfaction of judgment or settlement of the claim itself, and with the further limitation that in such actions no indemnification shall be made in the event such person is adjudged liable to the corporation unless a court believes that in light of all the circumstances indemnification should apply.

Section 174 of the DGCL provides, among other things, that a director who willfully and negligently approves of an unlawful payment of dividends or an unlawful stock purchase or redemption may be held liable for such actions. A director who was either absent when the unlawful actions were approved or dissented at the time, may avoid liability by causing his dissent to such actions to be entered in the books containing the minutes of the meetings of the board of directors at the time the action occurred or immediately after the absent director receives notice of the unlawful acts.

Article Sixth of our amended and restated certificate of incorporation provides that our directors shall not be personally liable to us and our stockholders except for liability (i) for any breach of the director's duty of loyalty to us or any stockholder (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, pursuant to Section 174 of the DGCL, or for any transaction from which the Director derived an improper personal benefit.

Our amended and restated bylaws and amended and restated certificate of incorporation provide that we may indemnify any person who is or was a director, officer, employee or agent of us to the fullest extent permitted by Delaware law. The indemnification provisions contained in our amended and restated bylaws and amended and restated certificate of incorporation are not exclusive of any other rights to which a person may be entitled by law, agreement, vote of stockholders or disinterested directors or otherwise.

None of the proceeds will be credited to an account other than the appropriate capital share account.

(b) Exhibits. The following is a complete list of exhibits filed as part of the registration statement, which are incorporated herein:

		Exhibit Description

1.1	**	Form of Underwriting Agreement by and among Western Asset Mortgage Capital Corporation and the underwriters named therein

3.1	*	Amended and restated certificate of incorporation of Western Asset Mortgage Capital Corporation, incorporated by reference to Exhibit 3.1 to Amendment No. 10 Form S-11 (Registration Statement No. 333-159962), filed May 8, 2012

3.2	*	Amended and restated bylaws of Western Asset Mortgage Capital Corporation, incorporated by reference to Exhibit 3.2 to Amendment No. 10 Form S-11 (Registration Statement No. 333-159962), filed May 8, 2012

4.1	*	Specimen Common Stock Certificate of Western Asset Mortgage Capital Corporation, incorporated by reference to Exhibit 4.1 to Amendment No. 10 Form S-11 (Registration Statement No. 333-159962), filed May 8, 2012

5.1	**	Opinion of Skadden, Arps, Slate, Meagher & Flom LLP (including consent of such firm)

8.1	**	Tax Opinion of Skadden, Arps, Slate, Meagher & Flom LLP (including consent of such firm)

10.1	*	Form of Unit Purchase Agreement between Western Asset Mortgage Capital Corporation and certain institutional accredited investors, incorporated by reference to Exhibit 10.1 to Amendment No. 9 Form S-11 (Registration Statement No. 333-159962), filed April 30, 2012

10.2	*	Form of Warrant, incorporated by reference to Exhibit 10.2 to Amendment No. 9 Form S-11 (Registration Statement No. 333-159962), filed April 30, 2012

10.3	*	Management Agreement between Western Asset Mortgage Capital Corporation and Western Asset Management Company, incorporated by reference to Exhibit 10.4 to Form 10-Q, filed August 14, 2012

10.4	*	Registration Rights Agreement among Western Asset Mortgage Capital Corporation, Western Asset Management Company and certain individual holders, incorporated by reference to Exhibit 10.5 to Form 10-Q, filed August 14, 2012

10.5	*	Western Asset Mortgage Capital Corporation Equity Plan, incorporated by reference to Exhibit 10.5 to Amendment No. 9 Form S-11 (Registration Statement No. 333-159962), filed April 30, 2012

10.6	*	Western Asset Mortgage Capital Corporation Manager Equity Plan, incorporated by reference to Exhibit 10.6 to Amendment No. 9 Form S-11 (Registration Statement No. 333-159962), filed April 30, 2012

10.7	*	Form of Indemnification Agreement between Western Asset Mortgage Capital Corporation and a director, incorporated by reference to Exhibit 10.7 to Amendment No. 9 Form S-11 (Registration Statement No. 333-159962), filed April 30, 2012

		Exhibit Description

10.9	*	Restricted Stock Award Agreement for Western Asset Management Company, incorporated by reference to Exhibit 10.9 to Form 10-Q, filed August 14, 2012

10.10	*	Form of Restricted Stock Award Agreement for independent directors, incorporated by reference to Exhibit 10.2 to the Form S-8 (Registration Statement No. 1-35543), filed May 15, 2012

21.1	*	Subsidiaries of Western Asset Mortgage Capital Corporation, incorporated by reference to Exhibit 21.1 to Amendment No. 9 Form S-11 (Registration Statement No. 333-159962), filed April 30, 2012

23.1	**	Consent of Skadden, Arps, Slate, Meagher & Flom LLP (included in Exhibit 5.1)

23.2	**	Consent of Skadden, Arps, Slate, Meagher & Flom LLP (included in Exhibit 8.1)

23.3		Consent of PricewaterhouseCoopers LLP

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-11 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Pasadena, State of California, on April 17, 2013.

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the date indicated.

		Exhibit Description

1.1	**	Form of Underwriting Agreement by and among Western Asset Mortgage Capital Corporation and the underwriters named therein

3.1	*	Amended and restated certificate of incorporation of Western Asset Mortgage Capital Corporation, incorporated by reference to Exhibit 3.1 to Amendment No. 10 Form S-11 (Registration Statement No. 333-159962), filed May 8, 2012

3.2	*	Amended and restated bylaws of Western Asset Mortgage Capital Corporation, incorporated by reference to Exhibit 3.2 to Amendment No. 10 Form S-11 (Registration Statement No. 333-159962), filed May 8, 2012

4.1	*	Specimen Common Stock Certificate of Western Asset Mortgage Capital Corporation, incorporated by reference to Exhibit 4.1 to Amendment No. 10 Form S-11 (Registration Statement No. 333-159962), filed May 8, 2012

5.1	**	Opinion of Skadden, Arps, Slate, Meagher & Flom LLP (including consent of such firm)

8.1	**	Tax Opinion of Skadden, Arps, Slate, Meagher & Flom LLP (including consent of such firm)

10.1	*	Form of Unit Purchase Agreement between Western Asset Mortgage Capital Corporation and certain institutional accredited investors, incorporated by reference to Exhibit 10.1 to Amendment No. 9 Form S-11 (Registration Statement No. 333-159962), filed April 30, 2012

10.2	*	Form of Warrant, incorporated by reference to Exhibit 10.2 to Amendment No. 9 Form S-11 (Registration Statement No. 333-159962), filed April 30, 2012

10.3	*	Management Agreement between Western Asset Mortgage Capital Corporation and Western Asset Management Company, incorporated by reference to Exhibit 10.4 to Form 10-Q, filed August 14, 2012

10.4	*	Registration Rights Agreement among Western Asset Mortgage Capital Corporation, Western Asset Management Company and certain individual holders, incorporated by reference to Exhibit 10.5 to Form 10-Q, filed August 14, 2012

10.5	*	Western Asset Mortgage Capital Corporation Equity Plan, incorporated by reference to Exhibit 10.5 to Amendment No. 9 Form S-11 (Registration Statement No. 333-159962), filed April 30, 2012

10.6	*	Western Asset Mortgage Capital Corporation Manager Equity Plan, incorporated by reference to Exhibit 10.6 to Amendment No. 9 Form S-11 (Registration Statement No. 333-159962), filed April 30, 2012

10.7	*	Form of Indemnification Agreement between Western Asset Mortgage Capital Corporation and a director, incorporated by reference to Exhibit 10.7 to Amendment No. 9 Form S-11 (Registration Statement No. 333-159962), filed April 30, 2012

10.9	*	Restricted Stock Award Agreement for Western Asset Management Company, incorporated by reference to Exhibit 10.9 to Form 10-Q, filed August 14, 2012

10.10	*	Form of Restricted Stock Award Agreement for independent directors, incorporated by reference to Exhibit 10.2 to the Form S-8 (Registration Statement No. 1-35543), filed May 15, 2012


Large accelerated filer o		Accelerated filer o		Non-accelerated filer ý (Do not check if a smaller reporting company)		Smaller Reporting Company o

Title of Each Class of Securities To Be Registered	Proposed Maximum Aggregate Offering Price⁽¹⁾	Amount Of Registration Fee⁽¹⁾⁽²⁾




Common Stock, par value $0.01	$100,000,000	$13,640

		Per Share		Total




Public offering
Underwriting discount
Proceeds, before expenses, to us

		Per Share			Without Option			With Option

Public offering price
Underwriting discount
Proceeds, before expenses, to us


Securities and Exchange Commission registration fee	$	13,640
Financial Industry Regulatory Authority, Inc. filing fee		15,500
NYSE listing fee			*
Legal fees and expenses (including Blue Sky fees)			*
Accounting fees and expenses			*
Printing and engraving expenses			*
Miscellaneous			*

Total	$		*


Summary			1
Risk Factors			6
Forward-Looking Statements			7
Use of Proceeds			9
Distribution Policy			10
Capitalization			11
Description of Our Investment Guidelines and Certain Other Operating Policies			12
Description of Capital Stock			15
U.S. Federal Income Tax Considerations			24
Underwriting			46
Legal Matters			49
Experts			50
Where You Can Find More Information			50
Incorporation of Certain Documents by Reference			50


		Western Asset Mortgage Capital Corporation
		By:		/s/ GAVIN L. JAMES Gavin L. James President, Chief Executive Officer and Director

Signatures		Title	Date


By:	/s/ GAVIN L. JAMES Gavin L. James	President, Chief Executive Officer and Director (principal executive officer)	April 17, 2013
By:	/s/ STEVEN M. SHERWYN Steven M. Sherwyn	Chief Financial Officer (principal financial officer and principal accounting officer)	April 17, 2013
By:	/s/ JAMES W. HIRSCHMANN III James W. Hirschmann III	Chairman of the Board	April 17, 2013
By:	/s/ EDWARD D. FOX Edward D. Fox	Director	April 17, 2013
By:	/s/ M. CHRISTIAN MITCHELL M. Christian Mitchell	Director	April 17, 2013
By:	/s/ RICHARD W. ROLL Richard W. Roll	Director	April 17, 2013

Name		Number of Shares

Total