Fund objectives

The Fund’s primary investment objective is to provide current income. As a secondary investment objective, the Fund will seek capital appreciation.

The Fund seeks to achieve its investment objectives by investing primarily in a diverse portfolio of mortgage-backed securities and mortgage whole loans. Investments in mortgage-backed securities consist primarily of non-agency residential mortgage-backed securities and commercial mortgage-backed securities.

What’s inside

Letter from the chairman	III
Performance review	V
Fund at a glance	1
Schedule of investments	2
Statement of assets and liabilities	20
Statement of operations	21
Statements of changes in net assets	22
Statement of cash flows	23
Financial highlights	24
Notes to financial statements	27
Board approval of management and subadvisory agreements	42
Dividend reinvestment plan	49

Western Asset Mortgage Opportunity Fund Inc.

Letter from the chairman

Dear Shareholder,

We are pleased to provide the semi-annual report of Western Asset Mortgage Opportunity Fund Inc. for the six-month reporting period ended June 30, 2024. Please read on for Fund performance information during the Fund’s reporting period.

Special shareholder notice

Effective March 1, 2024, the named portfolio management team responsible for the day-to-day oversight of the Fund is as follows: Michael Buchanan, Greg Handler and Simon Miller.

As always, we remain committed to providing you with excellent service and a full spectrum of investment choices. We also remain committed to supplementing the support you receive from your financial advisor. One way we accomplish this is through our website, www.franklintempleton.com. Here you can gain immediate access to market and investment information, including:

•

Fund prices and performance,

•

Market insights and commentaries from our portfolio managers, and

•

A host of educational resources.

We look forward to helping you meet your financial goals.

Sincerely,

Jane Trust, CFA
Chairman, President and Chief Executive Officer

July 31, 2024

Western Asset Mortgage Opportunity Fund Inc.

III

Performance review

For the six months ended June 30, 2024, Western Asset Mortgage Opportunity Fund Inc. returned 6.84% based on its net asset value (“NAV”)i and 13.81% based on its New York Stock Exchange (“NYSE”) market price per share. The Fund’s unmanaged benchmark, the ICE BofA U.S. Floating Rate Home Equity Loan Asset Backed Securities Indexii, returned 3.33% for the same period.

The Fund has a practice of seeking to maintain a relatively stable level of distributions to shareholders. This practice has no impact on the Fund’s investment strategy and may reduce the Fund’s NAV. The Fund’s manager believes the practice helps maintain the Fund’s competitiveness and may benefit the Fund’s market price and premium/discount to the Fund’s NAV.

During the six-month period, the Fund made distributions to shareholders totaling $0.75 per share. As of June 30, 2024, the Fund estimates that 81% of the distributions were sourced from net investment income and 19% constituted a return of capital.* The performance table shows the Fund’s six-month total return based on its NAV and market price as of June 30, 2024. Past performance is no guarantee of future results.

Performance Snapshot as of June 30, 2024 (unaudited)
Price Per Share	6-Month Total Return**
$12.12 (NAV)	6.84 %†
$11.93 (Market Price)	13.81 %‡

All figures represent past performance and are not a guarantee of future results. Performance figures for periods shorter than one year represent cumulative figures and are not annualized.

** Total returns are based on changes in NAV or market price, respectively. Returns reflect the deduction of all Fund expenses, including management fees, operating expenses, and other Fund expenses. Returns do not reflect the deduction of brokerage commissions or taxes that investors may pay on distributions or the sale of shares.

† Total return assumes the reinvestment of all distributions, including returns of capital, if any, at NAV. Total return information is based on month-end net asset values. Certain adjustments were made to the net assets of the Fund at December 31, 2023, for financial reporting purposes. Accordingly, adjusted total returns have been disclosed in the Financial Highlights and differ from those reported here.

‡ Total return assumes the reinvestment of all distributions, including returns of capital, if any, in additional shares in accordance with the Fund’s Dividend Reinvestment Plan.

These estimates are not for tax purposes. The Fund will issue a Form 1099 with final composition of the distributions for tax purposes after year-end. A return of capital is not taxable and results in a reduction in the tax basis of a shareholder’s investment. For more information about a distribution’s composition, please refer to the Fund’s distribution press release or, if applicable, the Section 19 notice located in the press release section of our website, www.franklintempleton.com.

Western Asset Mortgage Opportunity Fund Inc. Semi-Annual Report

Performance review (cont’d)

Looking for additional information?

The Fund is traded under the symbol “DMO” and its closing market price is available in most newspapers under the NYSE listings. The daily NAV is available online under the symbol “XDMOX” on most financial websites. Barron’s and The Wall Street Journal’s Monday edition both carry closed-end fund tables that provide additional information. In addition, the Fund issues a quarterly press release that can be found on most major financial websites as well as www.franklintempleton.com.

In a continuing effort to provide information concerning the Fund, shareholders may call 1-888-777-0102 (toll free), Monday through Friday from 8:00 a.m. to 5:30 p.m. Eastern Time, for the Fund’s current NAV, market price and other information.

Thank you for your investment in the Western Asset Mortgage Opportunity Fund Inc. As always, we appreciate that you have chosen us to manage your assets and we remain focused on achieving the Fund’s investment goals.

Sincerely,

Jane Trust, CFA
Chairman, President and Chief Executive Officer

July 31, 2024

RISKS: The Fund is a non-diversified, closed-end management investment company designed primarily as a long-term investment and not as a trading vehicle. The Fund is not intended to be a complete investment program and, due to the uncertainty inherent in all investments, there can be no assurance that the Fund will achieve its investment objective. The Fund’s common stock is traded on the New York Stock Exchange. Similar to stocks, the Fund’s share price will fluctuate with market conditions and, at the time of sale, may be worth more or less than the original investment. Shares of closed-end funds often trade at a discount to their net asset value. Because the Fund is non-diversified, it may be more susceptible to economic, political, or regulatory events than a diversified fund. The Fund’s investments are subject to a number of risks, including credit risk, inflation risk and interest rate risk. As interest rates rise, bond prices fall, reducing the value of the Fund’s fixed income holdings. The Fund may invest in lower-rated high-yield bonds (commonly known as “junk bonds”), which are subject to greater liquidity risk and credit risk (risk of default) than higher-rated obligations. Mortgage-backed securities (MBS) are subject to additional risks, including: (1) credit risk associated with the performance of the underlying mortgage properties and of the borrowers owning these properties; (2) adverse changes in economic conditions and circumstances, which are more likely to have an adverse impact on MBS secured by loans on certain types of commercial properties than on those secured by loans on residential properties;(3) prepayment risk, which can lead to significant fluctuations in value of the MBS and can limit the potential gains in a declining interest rate environment; (4) loss of all or part of the premium, if any, paid; and (5) decline in the market value of the security, whether resulting from changes in interest rates, prepayments on the underlying mortgage collateral or perceptions of the credit risk associated with the underlying mortgage collateral. To the extent the Fund invests in mortgage whole loans, certain of these

Western Asset Mortgage Opportunity Fund Inc. Semi-Annual Report

risks may be magnified. In addition, risks associated with investments in whole loans include geographic concentration risk and risks relating to the reliance on third-party servicers to service and manage the mortgage whole loan. The Fund may invest in securities backed by subprime or distressed mortgages which involve a higher degree of risk and chance of loss. Leverage may result in greater volatility of NAV and the market price of common shares and increases a shareholder’s risk of loss. The Fund may make significant investments in derivative instruments. Derivative instruments can be illiquid, may disproportionately increase losses, and have a potentially large impact on Fund performance. The Fund is not guaranteed by the U.S. government, the U.S. Treasury or any government agency. The market values of securities or other assets will fluctuate, sometimes sharply and unpredictably, due to changes in general market conditions, overall economic trends or events, governmental actions or intervention, actions taken by the U.S. Federal Reserve or foreign central banks, market disruptions caused by trade disputes or other factors, political developments, armed conflicts, economic sanctions and countermeasures in response to sanctions, major cybersecurity events, investor sentiment, the global and domestic effects of a pandemic, and other factors that may or may not be related to the issuer of the security or other asset. The Fund may also invest in money market funds, including funds affiliated with the Fund’s manager and subadvisers.

All investments are subject to risk including the possible loss of principal. Past performance is no guarantee of future results. All index performance reflects no deduction for fees, expenses or taxes. Please note that an investor cannot invest directly in an index.

Net asset value (“NAV”) is calculated by subtracting total liabilities, including liabilities associated with financial leverage (if any) from the closing value of all securities held by the Fund (plus all other assets) and dividing the result (total net assets) by the total number of the common shares outstanding. The NAV fluctuates with changes in the market prices of securities in which the Fund has invested. However, the price at which an investor may buy or sell shares of the Fund is the Fund’s market price as determined by supply of and demand for the Fund’s shares.

The ICE BofA U.S. Floating Rate Home Equity Loan Asset Backed Securities Index tracks the performance of U.S. dollar-denominated investment grade floating-rate asset-backed securities collateralized by home equity loans publicly issued in the U.S. domestic market. Qualifying securities must have an investment grade rating, at least one year remaining to final stated maturity, a floating-rate coupon, and an original deal size for the collateral group of at least $250 million.

Important data provider notices and terms available at www.franklintempletondatasources.com.

Western Asset Mortgage Opportunity Fund Inc. Semi-Annual Report

VII

Schedule of investments (unaudited)

June 30, 2024

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Residential Mortgage-Backed Securities(a) — 111.4%
Adjustable Rate Mortgage Trust, 2005-5 1A1	3.792%	9/25/35	$72,369	$59,155 (b)
Adjustable Rate Mortgage Trust, 2005-7 2A21	4.864%	10/25/35	110,636	93,740 (b)
Adjustable Rate Mortgage Trust, 2005-12 5A1 (1 mo. Term SOFR + 0.614%)	5.960%	3/25/36	184,801	51,461 (b)
Aegis Asset Backed Securities Trust, 2005-3 M3 (1 mo. Term SOFR + 0.849%)	6.195%	8/25/35	3,460,000	2,782,994 (b)(c)
Alternative Loan Trust, 2005-11CB 3A3, IO (-1.000 x 1 mo. Term SOFR + 4.886%, 0.000% floor)	0.000%	6/25/35	853,222	29,948 (b)
Alternative Loan Trust, 2005-14 3A1	3.580%	5/25/35	91,585	68,794 (b)
Alternative Loan Trust, 2005-36 4A1	4.368%	8/25/35	112,383	97,199 (b)
Alternative Loan Trust, 2005-J10 1A1 (1 mo. Term SOFR + 0.614%, 5.500% cap)	5.500%	10/25/35	398,126	236,429 (b)
Alternative Loan Trust, 2006-HY10 1A1	3.924%	5/25/36	111,169	89,665 (b)
Alternative Loan Trust, 2006-J8 A5	6.000%	2/25/37	71,595	30,210
Alternative Loan Trust, 2007-3T1 2A1	6.000%	3/25/27	17,478	16,973
Alternative Loan Trust, 2007-23CB A8 (-4.000 x 1 mo. Term SOFR + 27.942%)	6.561%	9/25/37	370,198	289,512 (b)(c)
Alternative Loan Trust, 2007-OA8 1A1 (1 mo. Term SOFR + 0.474%)	5.820%	6/25/47	622,448	505,671 (b)(c)
American Home Mortgage Assets Trust, 2005-2 2A1A	3.461%	1/25/36	546,652	343,760 (b)
American Home Mortgage Investment Trust, 2007-2 2A (1 mo. Term SOFR + 0.914%)	6.260%	3/25/47	12,735,445	97,762 (b)
American Home Mortgage Investment Trust, 2007-A 4A (1 mo. Term SOFR + 1.014%)	6.360%	7/25/46	1,733,247	413,977 (b)(d)
Banc of America Funding Corp., 2015-R3 2A2	3.820%	2/27/37	2,454,998	2,187,917 (b)(c)(d)
Banc of America Funding Trust, 2004-C 3A1	4.715%	12/20/34	148,056	130,458 (b)
Banc of America Funding Trust, 2006-D 2A1	3.499%	5/20/36	28,584	24,840 (b)
Banc of America Funding Trust, 2006-F 1A1	6.443%	7/20/36	43,022	40,861 (b)
Banc of America Funding Trust, 2014-R5 1A2 (6 mo. Term SOFR + 1.928%)	4.115%	9/26/45	3,231,373	2,284,463 (b)(c)(d)
Banc of America Funding Trust, 2015-R2 9A2	4.929%	3/27/36	2,794,076	2,258,316 (b)(c)(d)
Bayview Financial Asset Trust, 2007-SR1A M1 (1 mo. Term SOFR + 0.914%)	6.260%	3/25/37	1,226,926	1,210,155 (b)(d)
Bayview Financial Asset Trust, 2007-SR1A M2 (1 mo. Term SOFR + 1.014%)	6.360%	3/25/37	1,493,733	1,481,863 (b)(c)(d)

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Residential Mortgage-Backed Securities(a) — continued
Bayview Financial Asset Trust, 2007-SR1A M3 (1 mo. Term SOFR + 1.264%)	6.610%	3/25/37	$676,757	$677,303 (b)(d)
Bayview Financing INV Trust, 2021-6F A1	2.750%	12/30/27	1,556,401	1,430,864 (d)
Bear Stearns ALT-A Trust, 2005-9 25A1	4.546%	11/25/35	130,322	84,973 (b)
Bear Stearns Asset Backed Securities Trust, 2005-CL1 A1 (1 mo. Term SOFR + 0.614%)	3.560%	9/25/34	16,112	15,753 (b)
CAFL Issuer LLC, 2023-RTL1 A2	9.300%	12/28/30	1,770,000	1,778,067 (c)(d)
Chase Mortgage Finance Trust, 2006-S3 2A1	—	11/25/21	122,368	37,592 *(e)
Chase Mortgage Finance Trust, 2007-A1 11M1	4.675%	3/25/37	614,209	564,247 (b)
ChaseFlex Trust, 2005-2 3A3, IO (-1.000 x 1 mo. Term SOFR + 5.386%)	0.040%	6/25/35	5,518,455	467,047 (b)(c)
Chevy Chase Funding LLC Mortgage-Backed Certificates, 2006-2A A1 (1 mo. Term SOFR + 0.244%)	5.590%	4/25/47	45,628	42,094 (b)(d)
CHL Mortgage Pass-Through Trust, 2005-2 2A1 (1 mo. Term SOFR + 0.754%)	6.100%	3/25/35	38,224	35,264 (b)
CHL Mortgage Pass-Through Trust, 2005-18 A7 (-2.750 x 1 mo. Term SOFR + 19.210%)	4.511%	10/25/35	9,148	5,718 (b)
CHL Mortgage Pass-Through Trust, 2005- HY10 1A1	5.284%	2/20/36	12,758	10,422 (b)
CHL Mortgage Pass-Through Trust, 2005- HYB9 1A1 (12 mo. Term SOFR + 2.465%)	7.873%	2/20/36	68,905	57,651 (b)
CIM Trust, 2021-INV1 AXS, IO	0.190%	7/1/51	47,052,863	475,629 (b)(d)
Citicorp Mortgage Securities Trust, 2007-8 B1	5.983%	9/25/37	2,536,520	1,637,919 (b)(c)
Citigroup Mortgage Loan Trust, 2006-AR5 2A1A	3.923%	7/25/36	166,169	92,256 (b)
Citigroup Mortgage Loan Trust, 2008-3 A3	6.100%	4/25/37	5,340,807	2,421,131 (c)(d)
Citigroup Mortgage Loan Trust, 2021-J2 A4I2, IO	0.180%	7/25/51	34,428,378	346,694 (b)(d)
Citigroup Mortgage Loan Trust Inc., 2004- UST1 A2	6.722%	8/25/34	5,504	5,053 (b)
Citigroup Mortgage Loan Trust Inc., 2005-5 1A5	3.177%	8/25/35	70,355	53,910 (b)
Countrywide Asset-Backed Certificates Trust, 2006-SD3 A1 (1 mo. Term SOFR + 0.774%)	6.120%	7/25/36	104,860	102,826 (b)(d)

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Schedule of investments (unaudited) (cont’d)

June 30, 2024

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Residential Mortgage-Backed Securities(a) — continued
Countrywide Asset-Backed Certificates Trust, 2007-SEA1 1A1 (1 mo. Term SOFR + 1.214%)	6.560%	5/25/47	$238,091	$186,305 (b)(d)
CSMC Trust, 2021-INV2 A3X, IO	0.500%	11/25/56	28,426,882	788,195 (b)(d)
Credit-Based Asset Servicing & Securitization LLC, 2006-SL1 A3 (1 mo. Term SOFR + 0.554%)	5.900%	9/25/36	3,414,971	133,589 (b)(d)
CSFB Mortgage-Backed Pass-Through Certificates, 2005-10 3A3	5.500%	11/25/35	184,184	101,166
CSMC Resecuritization Trust, 2006-1R 1A2 (-2.750 x 1 mo. Term SOFR + 19.210%)	4.509%	7/27/36	159,151	146,115 (b)(d)
CSMC Trust, 2014-11R 9A2 (1 mo. Term SOFR + 0.254%)	5.719%	10/27/36	2,696,404	2,066,093 (b)(c)(d)
CSMC Trust, 2015-2R 7A2	5.075%	8/27/36	3,143,868	2,363,915 (b)(c)(d)
CSMC Trust, 2017-RPL1 B1	2.973%	7/25/57	3,052,442	2,020,929 (b)(c)(d)
CSMC Trust, 2017-RPL1 B2	2.973%	7/25/57	3,501,991	2,048,628 (b)(c)(d)
CSMC Trust, 2017-RPL1 B3	2.973%	7/25/57	2,977,486	1,287,268 (b)(c)(d)
CSMC Trust, 2017-RPL1 B4	2.973%	7/25/57	2,940,132	593,613 (b)(c)(d)
CSMC Trust, 2021-NQM6 B2	4.140%	7/25/66	1,370,000	941,551 (b)(c)(d)
CWABS Revolving Home Equity Loan Trust, 2004-L 2A (1 mo. Term SOFR + 0.394%)	5.723%	2/15/34	14,771	14,100 (b)
Deutsche Mortgage Securities Inc. Mortgage Loan Trust, 2006-PR1 2PO, PO	0.000%	4/15/36	10,776	5,157 (d)
Deutsche Mortgage Securities Inc. Mortgage Loan Trust, 2006-PR1 4AS1, IO	3.397%	4/15/36	53,703	3,900 (b)(d)
Deutsche Mortgage Securities Inc. Mortgage Loan Trust, 2006-PR1 4AS2, IO	4.608%	4/15/36	51,277	5,559 (b)(d)
Deutsche Mortgage Securities Inc. Mortgage Loan Trust, 2006-PR1 5AS1, IO	1.722%	4/15/36	42,837	4,858 (b)(d)
Deutsche Mortgage Securities Inc. Mortgage Loan Trust, 2006-PR1 5AS3, IO	2.672%	4/15/36	152,996	17,291 (b)(d)
DK Note Backed Trust, 2024-SPT1 A	7.086%	4/28/66	866,814	892,804 (d)
Eagle RE Ltd., 2023-1 M2 (30 Day Average SOFR + 5.200%)	10.535%	9/26/33	1,290,000	1,370,224 (b)(c)(d)
FARM Mortgage Trust, 2021-1 B	3.240%	7/25/51	1,601,555	1,153,738 (b)(d)
Federal Home Loan Mortgage Corp. (FHLMC) REMIC, Structured Agency Credit Risk Debt Notes, 2019-HQA4 B2 (30 Day Average SOFR + 6.714%)	12.050%	11/25/49	1,420,000	1,571,383 (b)(c)(d)

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Residential Mortgage-Backed Securities(a) — continued
Federal Home Loan Mortgage Corp. (FHLMC) REMIC, Structured Agency Credit Risk Debt Notes, 2021-DNA5 B2 (30 Day Average SOFR + 5.500%)	10.835%	1/25/34	$1,200,000	$1,350,431 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) REMIC, Structured Agency Credit Risk Debt Notes, 2021-DNA6 B2 (30 Day Average SOFR + 7.500%)	12.835%	10/25/41	1,640,000	1,774,734 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) REMIC, Structured Agency Credit Risk Debt Notes, 2021-HQA4 B2 (30 Day Average SOFR + 7.000%)	12.335%	12/25/41	1,650,000	1,761,959 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Seasoned Credit Risk Transfer Trust, 2016-1 B, PO	0.000%	9/25/55	12,011,504	1,481,784 (c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Seasoned Credit Risk Transfer Trust, 2016-1 BIO, IO	1.298%	9/25/55	20,547,135	2,338,436 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Seasoned Credit Risk Transfer Trust, 2016-1 XSIO, IO	0.075%	9/25/55	131,435,450	533,759 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Seasoned Credit Risk Transfer Trust, 2018-2 BX	2.861%	11/25/57	3,405,770	1,167,747 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Seasoned Credit Risk Transfer Trust, 2018-3 BX	1.520%	8/25/57	3,303,322	1,140,582 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Seasoned Credit Risk Transfer Trust, 2019-2 M	4.750%	8/25/58	681,000	643,753 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Seasoned Credit Risk Transfer Trust, 2020-1 BXS	6.201%	8/25/59	4,011,277	1,766,498 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Seasoned Credit Risk Transfer Trust, 2021-1 M	4.250%	9/25/60	1,500,000	1,413,300 (c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Seasoned Credit Risk Transfer Trust, 2021-3 BXS	7.801%	3/25/61	1,669,114	983,628 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Seasoned Credit Risk Transfer Trust, 2022-2 M	5.000%	4/25/62	1,337,000	1,143,423 (b)(c)(d)

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Schedule of investments (unaudited) (cont’d)

June 30, 2024

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Residential Mortgage-Backed Securities(a) — continued
Federal Home Loan Mortgage Corp. (FHLMC) Seasoned Credit Risk Transfer Trust, 2024-1 M	5.000%	11/25/63	$1,540,000	$1,252,798 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Debt Notes, 2016-DNA2 B (30 Day Average SOFR + 10.614%)	15.950%	10/25/28	491,240	557,962 (b)(c)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Debt Notes, 2016-DNA3 B (30 Day Average SOFR + 11.364%)	16.700%	12/25/28	1,019,110	1,175,157 (b)(c)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Debt Notes, 2016-DNA4 B (30 Day Average SOFR + 8.714%)	14.050%	3/25/29	1,560,047	1,751,284 (b)(c)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Debt Notes, 2017-DNA2 B2 (30 Day Average SOFR + 11.364%)	16.700%	10/25/29	1,753,298	2,071,459 (b)(c)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Securitized Participation Interests Trust, 2017-SPI1 B	4.120%	9/25/47	747,410	547,541 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Debt Notes, 2018-DNA3 B2 (30 Day Average SOFR + 7.864%)	13.200%	9/25/48	2,000,000	2,348,019 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Debt Notes, 2018-HRP1 B2 (30 Day Average SOFR + 11.864%)	17.200%	5/25/43	5,389,664	6,571,347 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Debt Notes, 2018-HRP2 B2 (30 Day Average SOFR + 10.614%)	15.950%	2/25/47	3,530,000	4,372,108 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Debt Notes, 2019-FTR1 B2 (30 Day Average SOFR + 8.464%)	13.800%	1/25/48	715,000	863,474 (b)(c)(d)

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Residential Mortgage-Backed Securities(a) — continued
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Debt Notes, 2019-FTR2 B2 (30 Day Average SOFR + 7.514%)	12.850%	11/25/48	$1,270,000	$1,469,229 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Securitized Participation Interests Trust, 2018-SPI2 B	3.848%	5/25/48	1,792,182	1,283,068 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Securitized Participation Interests Trust, 2018-SPI4 B	4.513%	11/25/48	3,694,979	2,518,348 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Trust, 2019-FTR3 B2 (30 Day Average SOFR + 4.914%)	10.238%	9/25/47	1,200,000	1,291,213 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Trust, 2019-FTR4 B2 (30 Day Average SOFR + 5.114%)	10.450%	11/25/47	1,250,000	1,351,536 (b)(c)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Structured Agency Credit Risk Trust, 2019-HQA3 B2 (30 Day Average SOFR + 7.614%)	12.950%	9/25/49	700,000	793,187 (b)(c)(d)
Federal National Mortgage Association (FNMA), 2012-134 LS, IO (-1.000 x 30 Day Average SOFR + 6.036%)	0.700%	12/25/42	999,208	96,096 (b)
Federal National Mortgage Association (FNMA) — CAS, 2016-C01 1B (30 Day Average SOFR + 11.864%)	17.200%	8/25/28	1,855,084	2,127,215 (b)(c)(d)
Federal National Mortgage Association (FNMA) — CAS, 2016-C03 1B (30 Day Average SOFR + 11.864%)	17.200%	10/25/28	1,923,712	2,234,871 (b)(c)(d)
Federal National Mortgage Association (FNMA) — CAS, 2016-C04 1B (30 Day Average SOFR + 10.364%)	15.700%	1/25/29	2,605,614	2,991,958 (b)(c)(d)
Federal National Mortgage Association (FNMA) — CAS, 2016-C06 1B (30 Day Average SOFR + 9.364%)	14.700%	4/25/29	3,499,735	3,990,146 (b)(c)(d)
Federal National Mortgage Association (FNMA) — CAS, 2020-R01 1B1 (30 Day Average SOFR + 3.364%)	8.700%	1/25/40	1,500,000	1,563,899 (b)(c)(d)

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Schedule of investments (unaudited) (cont’d)

June 30, 2024

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Residential Mortgage-Backed Securities(a) — continued
Federal National Mortgage Association (FNMA) — CAS, 2021-R01 1B2 (30 Day Average SOFR + 6.000%)	11.335%	10/25/41	$1,320,000	$1,389,580 (b)(c)(d)
Federal National Mortgage Association (FNMA) — CAS, 2021-R02 2B2 (30 Day Average SOFR + 6.200%)	11.535%	11/25/41	1,500,000	1,591,093 (b)(c)(d)
First Horizon Alternative Mortgage Securities Trust, 2005-AA6 3A1	4.783%	8/25/35	192,079	161,075 (b)
First Horizon Alternative Mortgage Securities Trust, 2006-FA6 2A1, PAC	6.250%	11/25/36	64,095	17,475
Federal Home Loan Mortgage Corp. (FHLMC) Whole Loan Securities Trust, 2015- SC01 B	3.855%	5/25/45	2,718,362	1,898,884 (b)(d)
GCAT Trust, 2019-RPL1 B2	3.750%	10/25/68	2,008,000	1,578,913 (b)(c)(d)
GS Mortgage-Backed Securities Trust, 2021-GR2 AIOS, IO	0.190%	2/25/52	69,964,320	736,913 (b)(d)
GS Mortgage-Backed Securities Trust, 2021-PJ2 AIOS, IO	0.220%	7/25/51	63,540,066	789,841 (b)(d)
GS Mortgage-Backed Securities Trust, 2022-NQM1 B4	4.091%	5/25/62	1,561,967	1,241,761 (b)(c)(d)
GSMPS Mortgage Loan Trust, 2005-RP1 1A4	8.500%	1/25/35	32,456	32,067 (d)
GSMPS Mortgage Loan Trust, 2006-RP1 1A2	7.500%	1/25/36	222,790	192,761 (d)
Home Partners of America Trust, 2021-2 F	3.799%	12/17/26	1,431,907	1,302,122 (c)(d)
Home RE Ltd., 2023-1 M2 (30 Day Average SOFR + 6.000%)	11.335%	10/25/33	1,000,000	1,085,824 (b)(c)(d)
HSI Asset Loan Obligation Trust, 2007-AR1 4A1	4.991%	1/25/37	61,083	45,941 (b)
Impac CMB Trust, 2004-8 1A (1 mo. Term SOFR + 0.834%)	6.180%	10/25/34	55,436	52,656 (b)
IndyMac INDA Mortgage Loan Trust, 2005- AR2 1A1	3.694%	1/25/36	58,042	43,442 (b)
IndyMac INDX Mortgage Loan Trust, 2005- AR18 1A1 (1 mo. Term SOFR + 0.734%)	6.080%	10/25/36	1,532,966	625,373 (b)(c)
IndyMac INDX Mortgage Loan Trust, 2004- AR13 1A1	3.615%	1/25/35	22,187	20,002 (b)
IndyMac INDX Mortgage Loan Trust, 2005- AR15 A2	3.979%	9/25/35	34,261	27,132 (b)
IndyMac INDX Mortgage Loan Trust, 2006- AR7 5A1	3.949%	5/25/36	107,528	94,176 (b)

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Residential Mortgage-Backed Securities(a) — continued
IndyMac INDX Mortgage Loan Trust, 2006- AR9 3A3	3.537%	6/25/36	$203,918	$171,080 (b)
IndyMac INDX Mortgage Loan Trust, 2006- AR11 1A1	4.561%	6/25/36	206,296	156,209 (b)
JPMorgan Alternative Loan Trust, 2007-A1 3A1	4.115%	3/25/37	167,322	151,105 (b)
JPMorgan Mortgage Trust, 2007-S2 3A2	6.000%	6/25/37	23,804	22,512
JPMorgan Mortgage Trust, 2007-S2 3A3	6.500%	6/25/37	6,618	6,365
JPMorgan Mortgage Trust, 2024-3 AX1, IO	0.343%	5/25/54	22,495,340	439,746 (b)(d)
Legacy Mortgage Asset Trust, 2021-GS3 A2	6.250%	7/25/61	1,647,688	1,536,847 (c)(d)
Lehman Mortgage Trust, 2006-3 1A7, IO (-1.000 x 1 mo. Term SOFR + 5.286%, 0.000% floor)	0.000%	7/25/36	3,954,383	272,899 (b)(c)
Lehman Mortgage Trust, 2007-5 2A3 (1 mo. Term SOFR + 0.444%)	5.790%	6/25/37	2,575,856	447,138 (b)
Lehman XS Trust, 2006-19 A4 (1 mo. Term SOFR + 0.454%)	5.800%	12/25/36	321,370	293,414 (b)(c)
LHOME Mortgage Trust, 2024-RTL1 A2	9.165%	1/25/29	1,100,000	1,097,838 (c)(d)
MASTR Adjustable Rate Mortgages Trust, 2004-12 5A1	5.660%	10/25/34	2,578	2,462 (b)
MASTR Adjustable Rate Mortgages Trust, 2006-OA1 1A1 (1 mo. Term SOFR + 0.324%)	5.670%	4/25/46	89,786	76,246 (b)
MASTR Reperforming Loan Trust, 2005-1 1A4	7.500%	8/25/34	40,575	29,931 (d)
Merrill Lynch Mortgage Investors Trust, 2006-A1 2A1	4.303%	3/25/36	302,635	146,488 (b)
Morgan Stanley Mortgage Loan Trust, 2006- 8AR 1A2 (1 mo. Term SOFR + 0.254%)	5.600%	6/25/36	189,375	37,407 (b)
Morgan Stanley Mortgage Loan Trust, 2007- 5AX 2A3 (1 mo. Term SOFR + 0.574%)	5.920%	2/25/37	1,322,948	274,889 (b)
Morgan Stanley Mortgage Loan Trust, 2007- 15AR 4A1	3.677%	11/25/37	238,888	198,017 (b)
Morgan Stanley Re-REMIC Trust, 2015-R2 1B (Federal Reserve U.S. 12 mo. Cumulative Avg 1 Year CMT + 0.710%)	4.408%	12/27/46	697,716	586,908 (b)(c)(d)
New Residential Mortgage Loan Trust, 2019-4A B6	4.592%	12/25/58	2,103,943	1,217,160 (b)(c)(d)
New Residential Mortgage Loan Trust, 2019-6A A1IB, IO	0.500%	9/25/59	18,661,321	269,811 (b)(d)
New Residential Mortgage Loan Trust, 2019-NQM4 B2	4.849%	9/25/59	1,608,000	1,351,264 (b)(c)(d)

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Schedule of investments (unaudited) (cont’d)

June 30, 2024

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Residential Mortgage-Backed Securities(a) — continued
New Residential Mortgage Loan Trust, 2024-RTL1 M1	9.239%	3/25/39	$380,000	$376,937 (b)(c)(d)
New Residential Mortgage Loan Trust, 2024-RTL1 M2	9.149%	3/25/39	870,000	856,669 (b)(c)(d)
NYMT Loan Trust, 2024-BPL1 A2	8.617%	2/25/29	1,620,000	1,620,259 (c)(d)
PMT Credit Risk Transfer Trust, 2019-2R A (1 mo. Term SOFR + 3.864%)	9.210%	5/30/25	1,386,165	1,387,927 (b)(c)(d)
Popular ABS Mortgage Pass-Through Trust, 2005-5 MV2 (1 mo. Term SOFR + 1.059%)	3.777%	11/25/35	1,802,737	1,585,221 (b)(c)
PRKCM Trust, 2023-AFC1 M1	7.555%	2/25/58	1,480,000	1,454,007 (b)(c)(d)
PRKCM Trust, 2023-AFC3 B1	7.861%	9/25/58	1,220,000	1,210,580 (b)(c)(d)
PRKCM Trust, 2024-AFC1 B2	8.500%	3/25/59	1,450,000	1,423,144 (b)(c)(d)
Progress Residential, 2021-SFR4 F	3.407%	5/17/38	835,000	767,512 (c)(d)
Provident Home Equity Loan Trust, 2000-2 A1 (1 mo. Term SOFR + 0.654%)	6.000%	8/25/31	479,162	440,740 (b)
RAAC Trust, 2007-SP1 M3 (1 mo. Term SOFR + 1.614%)	6.960%	3/25/37	1,426,481	1,115,842 (b)(c)
RALI Trust, 2005-QA3 CB4	3.837%	3/25/35	795,150	376,269 (b)
RALI Trust, 2006-QA1 A11	5.357%	1/25/36	231,189	171,384 (b)
RALI Trust, 2006-QA4 A (1 mo. Term SOFR + 0.474%)	5.820%	5/25/36	116,498	102,291 (b)
RALI Trust, 2006-QO2 A1 (1 mo. Term SOFR + 0.554%)	5.900%	2/25/46	165,246	29,654 (b)
RAMP Trust, 2004-RS4 MII2 (1 mo. Term SOFR + 1.464%)	5.784%	4/25/34	899,303	791,860 (b)(c)
Redwood Funding Trust, 2019-1 PT	4.968%	9/27/24	1,955,667	1,995,816 (d)
Renaissance Home Equity Loan Trust, 2006-1 AF5	6.166%	5/25/36	516,941	239,236
Renaissance Home Equity Loan Trust, 2007-2 AF2	5.675%	6/25/37	445,054	109,775
Renaissance Home Equity Loan Trust, 2007-3 AF3	7.238%	9/25/37	1,463,368	594,570 (c)
Residential Asset Securitization Trust, 2007-A2 1A1	6.000%	4/25/37	175,945	91,356
RFMSI Trust, 2006-S8 A12, IO (-1.000 x 1 mo. Term SOFR + 5.286%, 0.000% floor)	0.000%	9/25/36	1,756,445	86,192 (b)
Saluda Grade Alternative Mortgage Trust, 2024-RTL4 A2	7.500%	2/25/30	1,770,000	1,692,152 (c)(d)
Starwood Mortgage Residential Trust, 2020-3 B2	4.750%	4/25/65	1,490,000	1,151,144 (b)(c)(d)

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Residential Mortgage-Backed Securities(a) — continued
Structured Adjustable Rate Mortgage Loan Trust, 2004-18 1A2	5.260%	12/25/34	$126,822	$108,631 (b)
Structured Adjustable Rate Mortgage Loan Trust, 2005-4 1A1	4.637%	3/25/35	91,330	73,219 (b)
Structured Adjustable Rate Mortgage Loan Trust, 2005-7 1A3	5.099%	4/25/35	33,725	29,822 (b)
Structured Asset Investment Loan Trust, 2004-8 M9 (1 mo. Term SOFR + 3.864%)	9.210%	9/25/34	297,405	215,310 (b)
Toorak Mortgage Trust, 2024-RRTL1 B1	10.332%	2/25/39	800,000	781,012 (b)(c)(d)
Toorak Mortgage Trust, 2024-RRTL1 B2	10.332%	2/25/39	640,000	619,432 (b)(c)(d)
UWM Mortgage Trust, 2021-1 AX4, IO	0.250%	6/25/51	23,862,660	320,304 (b)(d)
Verus Securitization Trust, 2022-INV2 M1	6.807%	10/25/67	1,430,000	1,431,862 (b)(c)(d)
Verus Securitization Trust, 2023-3 B1	7.883%	3/25/68	1,200,000	1,197,009 (b)(c)(d)
Verus Securitization Trust, 2023-4 B1	8.160%	5/25/68	1,170,000	1,166,383 (b)(c)(d)
Verus Securitization Trust, 2023-5 B1	8.094%	6/25/68	1,200,000	1,196,874 (b)(c)(d)
Wachovia Mortgage Loan Trust LLC, 2005-B 2A2	6.321%	10/20/35	5,792	5,552 (b)
WaMu Mortgage Pass-Through Certificates Trust, 2005-8 1A6 (-3.667 x 1 mo. Term SOFR + 22.864%)	3.264%	10/25/35	94,104	76,315 (b)
WaMu Mortgage Pass-Through Certificates Trust, 2005-9 5A4 (-7.333 x 1 mo. Term SOFR + 35.094%, 0.000% floor)	0.000%	11/25/35	38,102	26,264 (b)
WaMu Mortgage Pass-Through Certificates Trust, 2005-10 2A3 (1 mo. Term SOFR + 1.014%, 5.750% cap)	5.750%	11/25/35	63,963	54,117 (b)
WaMu Mortgage Pass-Through Certificates Trust, 2005-AR2 B1 (1 mo. Term SOFR + 0.909%)	6.255%	1/25/45	1,265,294	1,062,175 (b)(c)
WaMu Mortgage Pass-Through Certificates Trust, 2005-AR13 A1C3 (1 mo. Term SOFR + 1.094%)	6.440%	10/25/45	67,804	63,614 (b)
WaMu Mortgage Pass-Through Certificates Trust, 2006-AR10 A1 (1 mo. Term SOFR + 0.314%)	5.660%	12/25/36	233,693	111,006 (b)
WaMu Mortgage Pass-Through Certificates Trust, 2006-AR16 2A2	4.355%	12/25/36	94,178	79,888 (b)
Wells Fargo Alternative Loan Trust, 2007- PA1 A12, IO (-1.000 x 1 mo. Term SOFR + 5.346%)	0.000%	3/25/37	1,009,451	50,653 (b)

Total Residential Mortgage-Backed Securities (Cost — $149,588,923)				153,659,612

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Schedule of investments (unaudited) (cont’d)

June 30, 2024

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Commercial Mortgage-Backed Securities(a) — 47.4%
280 Park Avenue Mortgage Trust, 2017- 280P E (1 mo. Term SOFR + 2.419%)	7.746%	9/15/34	$3,430,000	$3,131,237 (b)(d)
280 Park Avenue Mortgage Trust, 2017- 280P F (1 mo. Term SOFR + 3.127%)	8.454%	9/15/34	320,000	285,039 (b)(d)
BANK, 2021-BN35 H	1.766%	6/15/64	1,860,000	617,975 (b)(d)
BANK, 2021-BN35 K	1.766%	6/15/64	4,703,147	1,234,613 (b)(d)
BANK, 2022-BNK43 E	3.000%	8/15/55	1,500,000	942,502 (d)
BANK, 2022-BNK44 D	4.000%	11/15/32	3,198,000	2,440,848 (b)(d)
Benchmark Mortgage Trust, 2019-B12 WMA	4.388%	8/15/52	1,300,000	1,112,324 (b)(d)
Benchmark Mortgage Trust, 2023-V3 D	4.000%	7/15/56	1,100,000	913,275 (d)
BPR Trust, 2021-TY F (1 mo. Term SOFR + 4.314%)	9.643%	9/15/38	1,000,000	984,950 (b)(d)
BSREP Commercial Mortgage Trust, 2021-DC HRR (1 mo. Term SOFR + 5.614%)	10.943%	8/15/38	3,351,089	1,843,886 (b)(d)
BX Commercial Mortgage Trust, 2019-IMC F (1 mo. Term SOFR + 2.946%)	8.275%	4/15/34	2,000,000	1,947,181 (b)(d)
BX Commercial Mortgage Trust, 2021-XL2 J (1 mo. Term SOFR + 4.004%)	9.333%	10/15/38	1,759,770	1,721,298 (b)(d)
BX Commercial Mortgage Trust, 2022-LP2 G (1 mo. Term SOFR + 4.106%)	9.435%	2/15/39	909,340	898,823 (b)(d)
BX Commercial Mortgage Trust, 2024-KING E (1 mo. Term SOFR + 3.688%)	9.017%	5/15/34	1,190,000	1,187,320 (b)(d)
BX Trust, 2024-VLT4 E (1 mo. Term SOFR + 2.889%)	8.209%	7/15/29	2,000,000	1,996,007 (b)(d)
Citigroup Commercial Mortgage Trust, 2015-P1 E	4.514%	9/15/48	800,000	616,498 (b)(d)
CSMC Trust, 2017-CHOP F (PRIME + 1.294%)	9.794%	7/15/32	1,620,000	1,582,737 (b)(d)
CSMC Trust, 2017-CHOP H (PRIME + 4.294%)	12.794%	7/15/32	1,509,000	1,365,772 (b)(d)
CSMC Trust, 2021-ADV G (1 mo. Term SOFR + 6.364%)	11.693%	7/15/38	2,080,000	692,420 (b)(d)
Federal Home Loan Mortgage Corp. (FHLMC) Multifamily Structured Credit Risk, 2021-MN1 B1 (30 Day Average SOFR + 7.750%)	13.085%	1/25/51	950,000	1,039,328 (b)(d)
FREMF Mortgage Trust, 2021-F117 CS (30 Day Average SOFR + 6.400%)	11.724%	7/25/31	856,578	852,743 (b)(d)
FRESB Mortgage Trust, 2018-SB48 B	4.558%	2/25/38	1,122,925	579,165 (b)(d)

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Commercial Mortgage-Backed Securities(a) — continued
Government National Mortgage Association (GNMA), 2020-89 IA, IO	1.167%	4/16/62	$5,918,255	$473,380 (b)
Greystone CRE Notes, 2024-HC3 D (1 mo. Term SOFR + 5.333%)	10.661%	3/15/41	610,000	607,426 (b)(d)
GS Mortgage Securities Corp. Trust, 2018- LUAU G (1 mo. Term SOFR + 4.747%)	10.076%	11/15/32	2,500,000	2,465,420 (b)(d)
GS Mortgage Securities Corp. Trust, 2000-1A A (1 mo. Term SOFR + 0.464%)	—	3/20/23	7,084	7,076 *(b)(d)(e)
GS Mortgage Securities Trust, 2015-GC30 D	3.384%	5/10/50	750,000	626,486
GS Mortgage Securities Trust, 2015-GC32 D	3.345%	7/10/48	700,000	633,743
GS Mortgage Securities Corp., 2024-70P HRR	10.333%	3/10/41	4,420,000	4,393,669 (b)(d)
Hawaii Hotel Trust, 2019-MAUI F (1 mo. Term SOFR + 3.047%)	8.376%	5/15/38	2,221,000	2,213,145 (b)(d)
Hawaii Hotel Trust, 2019-MAUI G (1 mo. Term SOFR + 3.447%)	8.776%	5/15/38	1,697,000	1,661,782 (b)(d)
HIT Trust, 2022-HI32 G (1 mo. Term SOFR + 7.228%)	12.556%	7/15/24	1,938,278	1,935,756 (b)(d)
JPMorgan Chase Commercial Mortgage Securities Trust, 2018-PHMZ M (1 mo. Term SOFR + 8.622%)	13.951%	6/15/35	3,000,000	300 *(b)(d)(f)
JPMorgan Chase Commercial Mortgage Securities Trust, 2020-MKST G (1 mo. Term SOFR + 4.864%)	10.193%	12/15/36	988,000	20,541 (b)(d)
JPMorgan Chase Commercial Mortgage Securities Trust, 2020-MKST H (1 mo. Term SOFR + 7.364%)	12.693%	12/15/36	1,033,000	5,062 (b)(d)
JPMorgan Chase Commercial Mortgage Securities Trust, 2020-NNN HFL (1 mo. Term SOFR + 4.364%)	9.693%	1/16/37	120,216	110,179 (b)(d)
JPMorgan Chase Commercial Mortgage Securities Trust, 2021-NYMZ M (1 mo. Term SOFR + 7.364%)	12.943%	6/15/26	1,250,000	1,007,596 (b)(d)
KIND Trust, 2021-KIND F (1 mo. Term SOFR + 4.064%)	9.394%	8/15/38	1,299,330	1,232,896 (b)(d)
Med Trust, 2021-MDLN G (1 mo. Term SOFR + 5.364%)	10.693%	11/15/38	2,089,970	2,094,887 (b)(d)
Multifamily CAS Trust, 2019-1 CE (30 Day Average SOFR + 8.864%)	14.200%	10/25/49	2,500,000	2,506,390 (b)(d)
Multifamily CAS Trust, 2020-1 CE (30 Day Average SOFR + 7.614%)	12.950%	3/25/50	1,500,000	1,498,454 (b)(d)

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Schedule of investments (unaudited) (cont’d)

June 30, 2024

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Commercial Mortgage-Backed Securities(a) — continued
Natixis Commercial Mortgage Securities Trust, 2019-FAME D	4.544%	8/15/36	$1,900,000	$1,165,080 (b)(d)
Natixis Commercial Mortgage Securities Trust, 2019-FAME E	4.544%	8/15/36	950,000	487,445 (b)(d)
Natixis Commercial Mortgage Securities Trust, 2022-JERI G (1 mo. Term SOFR + 7.458%)	12.787%	1/15/39	3,500,000	2,647,956 (b)(d)
Natixis Commercial Mortgage Securities Trust, 2022-RRI E (1 mo. Term SOFR + 5.193%)	10.522%	3/15/35	1,272,750	1,274,188 (b)(d)
NCMF Trust, 2022-MFP G (1 mo. Term SOFR + 5.128%)	10.457%	3/15/39	2,200,000	2,127,400 (b)(d)
RIAL Issuer Ltd., 2022-FL8 E (1 mo. Term SOFR + 5.500%)	10.829%	1/19/37	1,500,000	1,420,428 (b)(d)
SMR Mortgage Trust, 2022-IND G (1 mo. Term SOFR + 7.500%)	12.829%	2/15/39	1,855,449	1,577,820 (b)(d)
Soho Trust, 2021-SOHO D	2.786%	8/10/38	1,500,000	872,560 (b)(d)
Starwood Retail Property Trust, 2014-STAR D	8.500%	11/15/27	1,000,000	40,000 (b)(d)
Starwood Retail Property Trust, 2014-STAR E	8.500%	11/15/27	1,600,000	7,566 (b)(d)
Wells Fargo Commercial Mortgage Trust, 2017-C42 D	2.800%	12/15/50	1,000,000	711,958 (b)(d)
Wells Fargo Commercial Mortgage Trust, 2022-JS2 G	3.569%	12/15/39	2,200,000	1,474,044 (b)(d)

Total Commercial Mortgage-Backed Securities (Cost — $79,349,127)				65,286,574
			Face Amount/ Units
Asset-Backed Securities — 15.0%
AMSR Trust, 2023-SFR2 E1	3.950%	6/17/40	$1,690,000	1,494,409 (c)(d)
Applebee’s Funding LLC/IHOP Funding LLC, 2023-1A A2	7.824%	3/5/53	1,000,000	1,036,488 (d)
BankAmerica Manufactured Housing Contract Trust, 1996-1 B1	7.875%	10/10/26	7,866,000	39,594
Bayview Opportunity Master Fund LLC, 2024-CAR1 E (30 Day Average SOFR + 3.600%)	8.935%	12/26/31	1,345,724	1,349,994 (b)(d)
BCMSC Trust, 1998-B A	6.530%	10/15/28	95,338	93,979 (b)
Cascade MH Asset Trust, 2019-MH1 M	5.985%	11/25/44	1,150,000	1,076,532 (b)(c)(d)

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount/ Units	Value
Asset-Backed Securities — continued
Conseco Finance Corp., 1999-4 A8	7.700%	5/1/31	$4,867,709	$1,750,831 (b)
Conseco Finance Corp., 1999-4 A9	7.020%	5/1/31	10,820,980	3,619,858 (b)
Hertz Vehicle Financing LLC, 2023-2A D	9.400%	9/25/29	690,000	686,622 (d)
Loanpal Solar Loan Ltd., 2020-3GS C	3.500%	12/20/47	672,084	403,299 (d)
Loanpal Solar Loan Ltd., 2021-1GS C	3.500%	1/20/48	724,119	451,868 (d)
Lunar Structured Aircraft Portfolio Notes, 2021-1 C	5.682%	10/15/46	1,612,715	1,444,615 (d)
National Collegiate Student Loan Trust, 2006-3 B (1 mo. Term SOFR + 0.474%)	5.820%	1/26/32	1,710,000	1,445,644 (b)
National Collegiate Class A-3L Commutation Trust, 2007-4VI O (1 mo. USD LIBOR + 0.850%)	6.281%	3/29/38	5,942,187	830,920 (b)(d)
Nelnet Student Loan Trust, 2021-DA D	4.380%	4/20/62	1,200,000	947,009 (d)
RBS Acceptance Inc., 1995-BA1 B2	—	8/10/20	2,191,561	22 *(e)
SEB Funding LLC, 2024-1A A2	7.386%	4/30/54	1,020,000	1,036,305 (d)
Sierra Timeshare Receivables Funding LLC, 2024-1A D	8.020%	1/20/43	688,283	693,660 (d)
SMB Private Education Loan Trust, 2014-A R	36.575%	9/15/45	6,875	493,771 (d)(g)
SoFi Professional Loan Program LLC, 2017-F R1	47.504%	1/25/41	34,000	300,685 (d)(g)
Stonepeak, 2021-1A B	3.821%	2/28/33	838,147	760,500 (d)
Sunnova Hellios II Issuer LLC, 2018-1A B	7.710%	7/20/48	899,387	780,724 (d)

Total Asset-Backed Securities (Cost — $26,085,757)				20,737,329
			Face Amount
Convertible Bonds & Notes — 2.4%
Financials — 2.4%
Mortgage Real Estate Investment Trusts (REITs) — 2.4%
PennyMac Corp., Senior Notes	5.500%	3/15/26	1,550,000	1,482,265
Two Harbors Investment Corp., Senior Notes	6.250%	1/15/26	1,835,000	1,761,600

Total Convertible Bonds & Notes (Cost — $3,131,250)				3,243,865
Corporate Bonds & Notes — 2.3%
Consumer Discretionary — 0.7%
Hotels, Restaurants & Leisure — 0.7%
Full House Resorts Inc., Senior Secured Notes	8.250%	2/15/28	$1,050,000	1,009,462 (d)

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Schedule of investments (unaudited) (cont’d)

June 30, 2024

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value

Financials — 1.0%
Banks — 0.5%
Lloyds Banking Group PLC, Junior Subordinated Notes (8.000% to 3/27/30 then 5 year Treasury Constant Maturity Rate + 3.913%)	8.000%	9/27/29	$750,000	$768,527 (b)(h)
Insurance — 0.5%
Allianz SE, Junior Subordinated Notes (3.200% to 4/30/28 then 5 year Treasury Constant Maturity Rate + 2.165%)	3.200%	10/30/27	800,000	655,839 (b)(d)(h)

Total Financials				1,424,366
Real Estate — 0.6%
Real Estate Management & Development — 0.6%
Cushman & Wakefield US Borrower LLC, Senior Secured Notes	8.875%	9/1/31	150,000	157,955 (d)
Five Point Operating Co. LP/Five Point Capital Corp., Senior Notes, Step bond (10.500% to 11/15/24 then 11.000%)	10.500%	1/15/28	600,000	615,654 (d)

Total Real Estate				773,609
Total Corporate Bonds & Notes (Cost — $3,015,056)				3,207,437
			Shares
Preferred Stocks — 1.8%
Financials — 1.8%
Mortgage Real Estate Investment Trusts (REITs) — 1.8%
AGNC Investment Corp., Non Voting Shares (6.125% to 4/15/25 then 3 mo. USD LIBOR + 4.697%)	6.125%		45,661	1,101,800 (b)
Chimera Investment Corp., Non Voting Shares	8.000%		32,036	717,606
MFA Financial Inc., Non Voting Shares (6.500% to 3/31/25 then 3 mo. USD LIBOR + 5.345%)	6.500%		30,120	707,820 (b)

Total Preferred Stocks (Cost — $2,463,372)				2,527,226

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Western Asset Mortgage Opportunity Fund Inc.

(Percentages shown based on Fund net assets)

Security	Rate	Maturity Date	Face Amount	Value
Senior Loans — 1.4%
Financials — 1.1%
Financial Services — 0.7%
Greystone Select Holdings LLC, Term Loan B (3 mo. Term SOFR + 5.262%)	10.588%	6/16/28	$987,342	$984,873 (b)(i)(j)
Mortgage Real Estate Investment Trusts (REITs) — 0.4%
Apollo Commercial Real Estate Finance Inc., Initial Term Loan (1 mo. Term SOFR + 2.864%)	8.208%	5/15/26	494,792	490,156 (b)(i)(j)

Total Financials				1,475,029
Real Estate — 0.3%
Real Estate Management & Development — 0.3%
Cushman & Wakefield US Borrower LLC, 2024 Term Loan 1 (1 mo. Term SOFR + 3.750%)	9.094%	1/31/30	498,750	502,491 (b)(i)(j)(k)

Total Senior Loans (Cost — $1,953,598)				1,977,520
Total Investments before Short-Term Investments (Cost — $265,587,083)				250,639,563
			Shares
Short-Term Investments — 1.7%
Western Asset Premier Institutional Government Reserves, Premium Shares (Cost — $2,278,132)	5.254%		2,278,132	2,278,132 (l)(m)
Total Investments — 183.4% (Cost — $267,865,215)				252,917,695
Liabilities in Excess of Other Assets — (83.4)%				(115,004,382 )
Total Net Assets — 100.0%				$137,913,313

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Schedule of investments (unaudited) (cont’d)

June 30, 2024

Western Asset Mortgage Opportunity Fund Inc.

*	Non-income producing security.
(a)	Collateralized mortgage obligations are secured by an underlying pool of mortgages or mortgage pass-through certificates that are structured to direct payments on underlying collateral to different series or classes of the obligations. The interest rate may change positively or inversely in relation to one or more interest rates, financial indices or other financial indicators and may be subject to an upper and/or lower limit.
(b)	Variable rate security. Interest rate disclosed is as of the most recent information available. Certain variable rate securities are not based on a published reference rate and spread but are determined by the issuer or agent and are based on current market conditions. These securities do not indicate a reference rate and spread in their description above.
(c)	All or a portion of this security is held by the counterparty as collateral for open reverse repurchase agreements.
(d)	Security is exempt from registration under Rule 144A of the Securities Act of 1933. This security may be resold in transactions that are exempt from registration, normally to qualified institutional buyers. This security has been deemed liquid pursuant to guidelines approved by the Board of Directors.
(e)	The maturity principal is currently in default as of June 30, 2024.
(f)	The coupon payment on this security is currently in default as of June 30, 2024.
(g)	Rate shown is the current yield based on income received over the trailing twelve months.
(h)	Security has no maturity date. The date shown represents the next call date.
(i)	Interest rates disclosed represent the effective rates on senior loans. Ranges in interest rates are attributable to multiple contracts under the same loan.
(j)	Senior loans may be considered restricted in that the Fund ordinarily is contractually obligated to receive approval from the agent bank and/or borrower prior to the disposition of a senior loan.
(k)	Security is valued using significant unobservable inputs (Note 1).
(l)	Rate shown is one-day yield as of the end of the reporting period.
(m)	In this instance, as defined in the Investment Company Act of 1940, an “Affiliated Company” represents Fund ownership of at least 5% of the outstanding voting securities of an issuer, or a company which is under common ownership or control with the Fund. At June 30, 2024, the total market value of investments in Affiliated Companies was $2,278,132 and the cost was $2,278,132 (Note 8).

Abbreviation(s) used in this schedule:
CAS	—	Connecticut Avenue Securities
CMT	—	Constant Maturity Treasury
IO	—	Interest Only
LIBOR	—	London Interbank Offered Rate
PAC	—	Planned Amortization Class
PO	—	Principal Only
REMIC	—	Real Estate Mortgage Investment Conduit
Re-REMIC	—	Resecuritization of Real Estate Mortgage Investment Conduit
SOFR	—	Secured Overnight Financing Rate
USD	—	United States Dollar

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Western Asset Mortgage Opportunity Fund Inc.

At June 30, 2024, the Fund had the following open reverse repurchase agreements:

Counterparty	Rate	Effective Date	Maturity Date	Face Amount of Reverse Repurchase Agreements	Asset Class of Collateral*	Collateral Value**
Nomura Securities Inc.	7.338%	5/16/2024	2/20/2026	$2,721,000	Residential Mortgage- Backed Securities	$3,118,797
Nomura Securities Inc.	7.339%	4/16/2024	2/20/2026	108,536,000	Residential Mortgage- Backed Securities Asset-Backed Securities	126,032,965 2,582,239
Nomura Securities Inc.	7.339%	4/16/2024	5/29/2025	1,243,000	Residential Mortgage- Backed Securities	1,389,346
Nomura Securities Inc.	7.355%	6/20/2024	2/20/2026	1,381,000	Collateralized Mortgage Obligations	1,593,016
				$113,881,000		$134,716,363

*	Refer to the Schedule of Investments for positions held at the counterparty as collateral for reverse repurchase agreements.
**	Including accrued interest.

At June 30, 2024, the Fund had the following open futures contracts:

	Number of Contracts	Expiration Date	Notional Amount	Market Value	Unrealized Depreciation
Contracts to Sell:
U.S. Treasury Long-Term Bonds	44	9/24	$5,148,054	$5,205,750	$(57,696 )
U.S. Treasury Ultra 10-Year Notes	79	9/24	8,905,693	8,968,969	(63,276 )
U.S. Treasury Ultra Long-Term Bonds	20	9/24	2,478,247	2,506,875	(28,628 )
Net unrealized depreciation on open futures contracts					$(149,600 )

At June 30, 2024, the Fund had the following open forward foreign currency contract:

Currency Purchased		Currency Sold		Counterparty	Settlement Date	Unrealized Appreciation
USD	13,583,978	CNH	98,113,000	Morgan Stanley & Co. Inc.	7/19/24	$120,601

Abbreviation(s) used in this table:
CNH	—	Chinese Offshore Yuan
USD	—	United States Dollar

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Statement of assets and liabilities (unaudited)

June 30, 2024

Assets:
Investments in unaffiliated securities, at value (Cost — $265,587,083)	$250,639,563
Investments in affiliated securities, at value (Cost — $2,278,132)	2,278,132
Cash	6,765
Interest and dividends receivable from unaffiliated investments	1,421,817
Deposits with brokers for open futures contracts	548,574
Receivable for securities sold	479,050
Unrealized appreciation on forward foreign currency contracts	120,601
Receivable from brokers — net variation margin on open futures contracts	115,391
Dividends receivable from affiliated investments	7,481
Principal paydown receivable	1,415
Prepaid expenses	6,571
Total Assets	255,625,360
Liabilities:
Payable for open reverse repurchase agreements (Note 3)	113,881,000
Interest expense payable	1,730,113
Distributions payable	1,479,860
Investment management fee payable	196,438
Directors’ fees payable	3,338
Accrued expenses	421,298
Total Liabilities	117,712,047
Total Net Assets	$137,913,313
Net Assets:
Par value ($0.001 par value; 11,383,541 shares issued and outstanding; 100,000,000 shares authorized)	$11,384
Paid-in capital in excess of par value	197,445,885
Total distributable earnings (loss)	(59,543,956 )
Total Net Assets	$137,913,313
Shares Outstanding	11,383,541
Net Asset Value	$12.12

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Statement of operations (unaudited)

For the Six Months Ended June 30, 2024

Investment Income:
Interest	$12,318,620
Dividends from affiliated investments	64,884
Total Investment Income	12,383,504
Expenses:
Interest expense (Note 3)	4,006,859
Investment management fee (Note 2)	1,221,475
Offering costs (Note 1)	234,541
Legal fees	49,358
Audit and tax fees	46,062
Shareholder reports	28,182
Directors’ fees	23,414
Transfer agent fees	18,312
Fund accounting fees	12,371
Stock exchange listing fees	6,106
Insurance	907
Custody fees	70
Miscellaneous expenses	4,272
Total Expenses	5,651,929
Less: Fee waivers and/or expense reimbursements (Note 2)	(113,002 )
Net Expenses	5,538,927
Net Investment Income	6,844,577
Realized and Unrealized Gain (Loss) on Investments, Futures Contracts and Forward Foreign Currency Contracts (Notes 1, 3 and 4):
Net Realized Gain (Loss) From:
Investment transactions in unaffiliated securities	(6,602,750 )
Futures contracts	(25,796 )
Forward foreign currency contracts	18,674
Net Realized Loss	(6,609,872 )
Change in Net Unrealized Appreciation (Depreciation) From:
Investments in unaffiliated securities	8,084,718
Futures contracts	788,277
Forward foreign currency contracts	120,601
Change in Net Unrealized Appreciation (Depreciation)	8,993,596
Net Gain on Investments, Futures Contracts and Forward Foreign Currency Contracts	2,383,724
Increase in Net Assets From Operations	$9,228,301

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Statements of changes in net assets

For the Six Months Ended June 30, 2024 (unaudited) and the Year Ended December 31, 2023	2024	2023
Operations:
Net investment income	$6,844,577	$12,237,489
Net realized gain (loss)	(6,609,872 )	532,358
Change in net unrealized appreciation (depreciation)	8,993,596	1,022,829
Increase in Net Assets From Operations	9,228,301	13,792,676
Distributions to Shareholders From (Note 1):
Total distributable earnings	(8,480,738 )	(14,575,127 )
Decrease in Net Assets From Distributions to Shareholders	(8,480,738 )	(14,575,127 )
Fund Share Transactions:
Cost of shares repurchased (0 and 13,982 shares repurchased, respectively) (Note 6)	—	(142,726 )
Decrease in Net Assets From Fund Share Transactions	—	(142,726 )
Increase (Decrease) in Net Assets	747,563	(925,177 )
Net Assets:
Beginning of period	137,165,750	138,090,927
End of period	$137,913,313	$137,165,750

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Statement of cash flows (unaudited)

For the Six Months Ended June 30, 2024

Increase (Decrease) in Cash:
Cash Flows from Operating Activities:
Net increase in net assets resulting from operations	$9,228,301
Adjustments to reconcile net increase in net assets resulting from operations to net cash provided (used) by operating activities:
Purchases of portfolio securities	(56,698,545 )
Sales of portfolio securities	43,508,709
Net purchases, sales and maturities of short-term investments	(1,713,623 )
Net amortization of premium (accretion of discount)	697,466
Increase in receivable for securities sold	(479,050 )
Increase in interest and dividends receivable from unaffiliated investments	(22,187 )
Decrease in prepaid expenses	241,778
Increase in dividends receivable from affiliated investments	(3,213 )
Increase in principal paydown receivable	(1,415 )
Increase in receivable from brokers — net variation margin on open futures contracts	(112,041 )
Decrease in payable for securities purchased	(1,196,961 )
Increase in investment management fee payable	15,824
Decrease in Directors’ fees payable	(4,373 )
Increase in interest expense payable	180,192
Decrease in accrued expenses	(74,205 )
Net realized loss on investments	6,602,750
Change in net unrealized appreciation (depreciation) of investments and forward foreign currency contracts	(8,205,319 )
Net Cash Used in Operating Activities*	(8,035,912 )
Cash Flows from Financing Activities:
Distributions paid on common stock (net of distributions payable)	(7,000,878 )
Increase in payable for open reverse repurchase agreements	13,881,000
Net Cash Provided by Financing Activities	6,880,122
Net Decrease in Cash and Restricted Cash	(1,155,790 )
Cash and restricted cash at beginning of period	1,711,129
Cash and restricted cash at end of period	$555,339

*	Included in operating expenses is $3,826,676 paid for interest on borrowings.

The following table provides a reconciliation of cash and restricted cash reported within the Statement of Assets

and Liabilities that sums to the total of such amounts shown on the Statement of Cash Flows.

	June 30, 2024
Cash	$6,765
Restricted cash	548,574
Total cash and restricted cash shown in the Statement of Cash Flows	$555,339

Restricted cash consists of cash that has been segregated to cover the Fund’s collateral or margin obligations under derivative contracts. It is separately reported on the Statement of Assets and Liabilities as Deposits with brokers.

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Financial highlights

For a share of capital stock outstanding throughout each year ended December 31, unless otherwise noted:
	2024 1,2	2023 1	2022 1	2021 1	2020 1	2019 1
Net asset value, beginning of period	$12.05	$12.12	$15.40	$14.96	$19.48	$19.28
Income (loss) from operations:
Net investment income	0.60	1.07	0.95	0.89	1.23	1.51
Net realized and unrealized gain (loss)	0.22	0.14	(3.00 )	0.90	(4.20 )	0.65
Total income (loss) from operations	0.82	1.21	(2.05)	1.79	(2.97)	2.16
Less distributions from:
Net investment income	(0.75 )3	(1.28 )	(1.23 )	(1.16 )	(1.13 )	(1.45 )
Return of capital	—	—	(0.01 )	(0.19 )	(0.42 )	(0.51 )
Total distributions	(0.75 )	(1.28 )	(1.24 )	(1.35 )	(1.55 )	(1.96 )
Anti-dilutive impact of repurchase plan	—	0.00 4,5	0.01 5	—	—	—
Net asset value, end of period	$12.12	$12.05	$12.12	$15.40	$14.96	$19.48
Market price, end of period	$11.93	$11.17	$10.77	$15.21	$14.18	$20.30
Total return, based on NAV6,7	6.93 %	10.51 %	(13.69 )%	12.38 %	(14.67 )%	11.65 %
Total return, based on Market Price8	13.81 %	16.68 %	(21.64 )%	17.24 %	(22.13 )%	9.71 %
Net assets, end of period (millions)	$138	$137	$138	$177	$165	$205
Ratios to average net assets:
Gross expenses	8.21 %9	7.28 %	3.80 %	2.38 %	2.82 %	3.56 %
Net expenses10	8.04 9,11	7.14 11	3.72 11	2.10 11	2.53 11	3.56
Net investment income	9.94 9	8.87	6.96	5.82	8.18	7.73
Portfolio turnover rate	18 %	24 %	24 %12	14 %	11 %	17 %
Supplemental data:
Loan Outstanding, End of Period (000s)	—	—	—	—	$45,000	$98,000
Asset Coverage Ratio for Loan Outstanding13	—	—	—	—	467 %	309 %
Asset Coverage, per $1,000 Principal Amount of Loan Outstanding13	—	—	—	—	$4,667	$3,089
Weighted Average Loan (000s)	—	—	—	$45,000	$62,369	$98,072
Weighted Average Interest Rate on Loan	—	—	—	1.84 %	2.14 %	3.46 %

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

For a share of capital stock outstanding throughout each year ended December 31, unless otherwise noted:
	2018 1	2017 1	2016 1	2015 1	2014 1
Net asset value, beginning of period	$21.27	$20.70	$22.76	$24.75	$23.78
Income (loss) from operations:
Net investment income (loss)	1.65	1.57	1.47	2.13	1.87
Net realized and unrealized gain (loss)	0.22	2.28	(0.53 )	(0.80 )	2.19
Total income (loss) from operations	1.87	3.85	0.94	1.33	4.06
Less distributions from:
Net investment income	(3.03 )	(2.69 )	(2.95 )	(2.33 )	(1.75)
Net realized gains	(0.83 )	(0.59 )	(0.05 )	(0.99 )	(1.34)
Return of capital	—	—	—	—	—
Total distributions	(3.86 )	(3.28 )	(3.00 )	(3.32 )	(3.09)
Anti-dilutive impact of repurchase plan	—	—	—	—	—
Net asset value, end of period	$19.28	$21.27	$20.70	$22.76	$24.75
Market price, end of period	$20.39	$24.67	$22.79	$23.55	$23.84
Total return, based on NAV6,7	9.26 %	19.70 %	4.47 %	5.44 %	17.55 %
Total return, based on Market Price8	(1.16 )%	24.20 %	10.80 %	13.56 %	16.76 %
Net assets, end of period (millions)	$202	$222	$216	$237	$258
Ratios to average net assets:
Gross expenses	3.15 %	2.68 %	2.97 %	2.39 %	2.36 %
Net expenses10	3.15	2.68	2.97	2.39	2.36
Net investment income	7.78	7.29	6.78	8.65	7.39
Portfolio Turnover rate	33 %	35 %	24 %12	24 %	35 %
Supplemental data:
Loan Outstanding, End of Period (000s)	$99,250	$101,750	$101,750	$80,500	$116,700
Asset Coverage Ratio for Loan Outstanding13	303 %	319 %	312 %	395 %	321 %
Asset Coverage, per $1,000 Principal Amount of Loan Outstanding13	$3,035	$3,185	$3,124	$3,946	$3,208 14
Weighted Average Loan (000s)	$101,743	$101,750	$90,984	$99,544	$116,700
Weighted Average Interest Rate on Loan	3.06 %	2.06 %	1.50 %	1.06 %	1.02 %

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Financial highlights (cont’d)

1	Per share amounts have been calculated using the average shares method.
2	For the six months ended June 30, 2024 (unaudited).
3	The actual source of the Fund’s current fiscal year distributions may be from net investment income, realized capital gains, return of capital or a combination thereof. Shareholders will be informed of the tax characteristics of the distributions after the close of the fiscal year.
4	Amount represents less than $0.005 or greater than $(0.005) per share.
5	The repurchase plan was completed at an average repurchase price of $10.21 for 13,982 shares and $142,726 for the year ended December 31, 2023 and $11.16 for 67,728 shares and $755,559 for the year ended December 31, 2022.
6	Performance figures may reflect compensating balance arrangements, fee waivers and/or expense reimbursements. In the absence of compensating balance arrangements, fee waivers and/or expense reimbursements, the total return would have been lower. Past performance is no guarantee of future results. Total returns for periods of less than one year are not annualized.
7	The total return calculation assumes that distributions are reinvested at NAV. Past performance is no guarantee of future results. Total returns for periods of less than one year are not annualized.
8	The total return calculation assumes that distributions are reinvested in accordance with the Fund’s dividend reinvestment plan. Past performance is no guarantee of future results. Total returns for periods of less than one year are not annualized.
9	Annualized.
10	The manager has agreed to waive the Fund’s management fee to an extent sufficient to offset the net management fee payable in connection with any investment in an affiliated money market fund.
11	Reflects fee waivers and/or expense reimbursements.
12	Including mortgage dollar roll transactions. If mortgage dollar roll transactions had been excluded, the portfolio turnover rates for the respective year/period presented would have been 22% and 23%.
13	Represents value of net assets plus the loan outstanding at the end of the period divided by the loan outstanding at the end of the period.
14	Added to conform to current period presentation.

See Notes to Financial Statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Notes to financial statements (unaudited)

1. Organization and significant accounting policies

Western Asset Mortgage Opportunity Fund Inc. (the “Fund”) was incorporated in Maryland on December 11, 2009, and is registered as a non-diversified, closed-end management investment company under the Investment Company Act of 1940, as amended (the “1940 Act”). The Fund’s primary investment objective is to provide current income. As a secondary investment objective, the Fund will seek capital appreciation. The Fund seeks to achieve its investment objectives by investing primarily in a diverse portfolio of mortgage-backed securities (“MBS”) and mortgage whole loans. Investments in MBS consist primarily of non-agency residential mortgage-backed securities (“RMBS”) and commercial mortgage-backed securities (“CMBS”).

The Fund follows the accounting and reporting guidance in Financial Accounting Standards Board (“FASB”) Accounting Standards Codification Topic 946, Financial Services – Investment Companies (“ASC 946”). The following are significant accounting policies consistently followed by the Fund and are in conformity with U.S. generally accepted accounting principles (“GAAP”), including, but not limited to, ASC 946. Estimates and assumptions are required to be made regarding assets, liabilities and changes in net assets resulting from operations when financial statements are prepared. Changes in the economic environment, financial markets and any other parameters used in determining these estimates could cause actual results to differ. Subsequent events have been evaluated through the date the financial statements were issued.

(a) Investment valuation. The valuations for fixed income securities (which may include, but are not limited to, corporate, government, municipal, mortgage-backed, collateralized mortgage obligations and asset-backed securities) and certain derivative instruments are typically the prices supplied by independent third party pricing services, which may use market prices or broker/dealer quotations or a variety of valuation techniques and methodologies. The independent third party pricing services typically use inputs that are observable such as issuer details, interest rates, yield curves, prepayment speeds, credit risks/spreads, default rates and quoted prices for similar securities. Investments in open-end funds are valued at the closing net asset value per share of each fund on the day of valuation. Futures contracts are valued daily at the settlement price established by the board of trade or exchange on which they are traded. Equity securities for which market quotations are available are valued at the last reported sales price or official closing price on the primary market or exchange on which they trade. When the Fund holds securities or other assets that are denominated in a foreign currency, the Fund will normally use the currency exchange rates as of 4:00 p.m. (Eastern Time). If independent third party pricing services are unable to supply prices for a portfolio investment, or if the prices supplied are deemed by the manager to be unreliable, the market price may be determined by the manager using quotations from one or more broker/dealers or at the transaction price if the security has recently been purchased and no value has yet been obtained from a pricing service or pricing broker. When reliable prices are not readily available, such as when the value of a security has been significantly affected by events after the close of the exchange

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Notes to financial statements (unaudited) (cont’d)

or market on which the security is principally traded, but before the Fund calculates its net asset value, the Fund values these securities as determined in accordance with procedures approved by the Fund’s Board of Directors.

Pursuant to policies adopted by the Board of Directors, the Fund’s manager has been designated as the valuation designee and is responsible for the oversight of the daily valuation process. The Fund’s manager is assisted by the Global Fund Valuation Committee (the “Valuation Committee”). The Valuation Committee is responsible for making fair value determinations, evaluating the effectiveness of the Fund’s pricing policies, and reporting to the Fund’s manager and the Board of Directors. When determining the reliability of third party pricing information for investments owned by the Fund, the Valuation Committee, among other things, conducts due diligence reviews of pricing vendors, monitors the daily change in prices and reviews transactions among market participants.

The Valuation Committee will consider pricing methodologies it deems relevant and appropriate when making fair value determinations. Examples of possible methodologies include, but are not limited to, multiple of earnings; discount from market of a similar freely traded security; discounted cash-flow analysis; book value or a multiple thereof; risk premium/yield analysis; yield to maturity; and/or fundamental investment analysis. The Valuation Committee will also consider factors it deems relevant and appropriate in light of the facts and circumstances. Examples of possible factors include, but are not limited to, the type of security; the issuer’s financial statements; the purchase price of the security; the discount from market value of unrestricted securities of the same class at the time of purchase; analysts’ research and observations from financial institutions; information regarding any transactions or offers with respect to the security; the existence of merger proposals or tender offers affecting the security; the price and extent of public trading in similar securities of the issuer or comparable companies; and the existence of a shelf registration for restricted securities.

For each portfolio security that has been fair valued pursuant to the policies adopted by the Board of Directors, the fair value price is compared against the last available and next available market quotations. The Valuation Committee reviews the results of such back testing monthly and fair valuation occurrences are reported to the Board of Directors quarterly.

The Fund uses valuation techniques to measure fair value that are consistent with the market approach and/or income approach, depending on the type of security and the particular circumstance. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable securities. The income approach uses valuation techniques to discount estimated future cash flows to present value.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

GAAP establishes a disclosure hierarchy that categorizes the inputs to valuation techniques used to value assets and liabilities at measurement date. These inputs are summarized in the three broad levels listed below:

•

Level 1 — unadjusted quoted prices in active markets for identical investments

•

Level 2 — other significant observable inputs (including quoted prices for similar investments, interest rates, prepayment speeds, credit risk, etc.)

•

Level 3 — significant unobservable inputs (including the Fund’s own assumptions in determining the fair value of investments)

The inputs or methodologies used to value securities are not necessarily an indication of the risk associated with investing in those securities.

The following is a summary of the inputs used in valuing the Fund’s assets and liabilities carried at fair value:

ASSETS
Description	Quoted Prices (Level 1)	Other Significant Observable Inputs (Level 2)	Significant Unobservable Inputs (Level 3)	Total
Long-Term Investments†:
Residential Mortgage-Backed Securities	—	$153,659,612	—	$153,659,612
Commercial Mortgage-Backed Securities	—	65,286,574	—	65,286,574
Asset-Backed Securities	—	20,737,329	—	20,737,329
Convertible Bonds & Notes	—	3,243,865	—	3,243,865
Corporate Bonds & Notes	—	3,207,437	—	3,207,437
Preferred Stocks	$2,527,226	—	—	2,527,226
Senior Loans:
Financials	—	1,475,029	—	1,475,029
Real Estate	—	—	$502,491	502,491
Total Long-Term Investments	2,527,226	247,609,846	502,491	250,639,563
Short-Term Investments†	2,278,132	—	—	2,278,132
Total Investments	$4,805,358	$247,609,846	$502,491	$252,917,695
Other Financial Instruments:
Forward Foreign Currency Contracts††	—	$120,601	—	$120,601
Total	$4,805,358	$247,730,447	$502,491	$253,038,296

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Notes to financial statements (unaudited) (cont’d)

LIABILITIES
Description	Quoted Prices (Level 1)	Other Significant Observable Inputs (Level 2)	Significant Unobservable Inputs (Level 3)	Total
Other Financial Instruments:
Futures Contracts††	$149,600	—	—	$149,600

†	See Schedule of Investments for additional detailed categorizations.
††	Reflects the unrealized appreciation (depreciation) of the instruments.

(b) Futures contracts. The Fund uses futures contracts generally to gain exposure to, or hedge against, changes in interest rates or gain exposure to, or hedge against, changes in certain asset classes. A futures contract represents a commitment for the future purchase or sale of an asset at a specified price on a specified date.

Upon entering into a futures contract, the Fund is required to deposit cash or securities with a broker in an amount equal to a certain percentage of the contract amount. This is known as the ‘‘initial margin’’ and subsequent payments (‘‘variation margin’’) are made or received by the Fund each day, depending on the daily fluctuation in the value of the contract. For certain futures, including foreign denominated futures, variation margin is not settled daily, but is recorded as a net variation margin payable or receivable. The daily changes in contract value are recorded as unrealized appreciation or depreciation in the Statement of Operations and the Fund recognizes a realized gain or loss when the contract is closed.

Futures contracts involve, to varying degrees, risk of loss in excess of the amounts reflected in the financial statements. In addition, there is the risk that the Fund may not be able to enter into a closing transaction because of an illiquid secondary market.

(c) Forward foreign currency contracts. The Fund enters into a forward foreign currency contract to hedge against, or manage exposure to, foreign issuers or markets. The Fund may also enter into a forward foreign currency contract to hedge against foreign currency exchange rate risk on its non-U.S. dollar denominated securities or to facilitate settlement of a foreign currency denominated portfolio transaction. A forward foreign currency contract is an agreement between two parties to buy and sell a currency at a set price with delivery and settlement at a future date. The contract is marked-to-market daily and the change in value is recorded by the Fund as an unrealized gain or loss. When a forward foreign currency contract is closed, through either delivery or offset by entering into another forward foreign currency contract, the Fund recognizes a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value of the contract at the time it is closed.

Non-deliverable forward foreign currency exchange contracts are settled with the counterparty in cash without the delivery of foreign currency.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Forward foreign currency contracts involve elements of market risk in excess of the amounts reflected on the Statement of Assets and Liabilities. The Fund bears the risk of an unfavorable change in the foreign exchange rate underlying the forward foreign currency contract. Risks may also arise upon entering into these contracts from the potential inability of the counterparties to meet the terms of their contracts.

(d) Loan participations. The Fund may invest in loans arranged through private negotiation between one or more financial institutions. The Fund’s investment in any such loan may be in the form of a participation in or an assignment of the loan. In connection with purchasing participations, the Fund generally will have no right to enforce compliance by the borrower with the terms of the loan agreement related to the loan, or any rights of offset against the borrower and the Fund may not benefit directly from any collateral supporting the loan in which it has purchased the participation.

The Fund assumes the credit risk of the borrower, the lender that is selling the participation and any other persons interpositioned between the Fund and the borrower. In the event of the insolvency of the lender selling the participation, the Fund may be treated as a general creditor of the lender and may not benefit from any offset between the lender and the borrower.

(e) Stripped securities. The Fund may invest in ‘‘Stripped Securities,’’ a term used collectively for components, or strips, of fixed income securities. Stripped Securities can be principal only securities (“PO”), which are debt obligations that have been stripped of unmatured interest coupons, or interest only securities (“IO”), which are unmatured interest coupons that have been stripped from debt obligations. The market value of Stripped Securities will fluctuate in response to changes in economic conditions, rates of pre-payment, interest rates and the market’s perception of the securities. However, fluctuations in response to interest rates may be greater in Stripped Securities than for debt obligations of comparable maturities that pay interest currently. The amount of fluctuation may increase with a longer period of maturity.

The yield to maturity on IO’s is sensitive to the rate of principal repayments (including prepayments) on the related underlying debt obligation and principal payments may have a material effect on yield to maturity. If the underlying debt obligation experiences greater than anticipated prepayments of principal, the Fund may not fully recoup its initial investment in IO’s.

(f) Reverse repurchase agreements. The Fund may enter into reverse repurchase agreements. Under the terms of a typical reverse repurchase agreement, a fund sells a security subject to an obligation to repurchase the security from the buyer at an agreed upon time and price. In the event the buyer of securities under a reverse repurchase agreement files for bankruptcy or becomes insolvent, the Fund’s use of the proceeds of the agreement may be restricted pending a determination by the counterparty, or its trustee or

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Notes to financial statements (unaudited) (cont’d)

receiver, whether to enforce the Fund’s obligation to repurchase the securities. In entering into reverse repurchase agreements, the Fund will pledge cash, U.S. government securities or other liquid debt obligations at least equal in value to its obligations with respect to reverse repurchase agreements or will take other actions permitted by law to cover its obligations. If the market value of the collateral declines during the period, the Fund may be required to post additional collateral to cover its obligation. Cash collateral that has been pledged to cover obligations of the Fund under reverse repurchase agreements, if any, will be reported separately in the Statement of Assets and Liabilities. Securities pledged as collateral are noted in the Schedule of Investments. Interest payments made on reverse repurchase agreements are recognized as a component of “Interest expense” on the Statement of Operations. In periods of increased demand for the security, the Fund may receive a fee for use of the security by the counterparty, which may result in interest income to the Fund.

(g) Mortgage dollar rolls. The Fund may enter into mortgage dollar rolls in which the Fund sells mortgage-backed securities for delivery in the current month, realizing a gain or loss, and simultaneously entering into contracts to repurchase substantially similar (same type, coupon and maturity) securities to settle on a specified future date.

The Fund executes its mortgage dollar rolls entirely in the TBA market, whereby the Fund makes a forward commitment to purchase a security and, instead of accepting delivery, the position is offset by a sale of the security with a simultaneous agreement to repurchase at a future date. The Fund accounts for mortgage dollar rolls as purchases and sales.

The risk of entering into mortgage dollar rolls is that the market value of the securities the Fund is obligated to repurchase under the agreement may decline below the repurchase price. In the event the buyer of securities under a mortgage dollar roll files for bankruptcy or becomes insolvent, the Fund’s use of the proceeds of the mortgage dollar roll may be restricted pending a determination by the counterparty, or its trustee or receiver, whether to enforce the Fund’s obligation to repurchase the securities.

(h) Mortgage-backed securities. Mortgage-Backed Securities (“MBS”) include CMBS and RMBS. These securities depend on payments (except for rights or other assets designed to assure the servicing or timely distribution of proceeds to holders of such securities) primarily from the cash flow from secured commercial or residential mortgage loans made to borrowers. Such loans are secured (on a first priority basis or second priority basis, subject to permitted liens, easements and other encumbrances) by commercial or residential real estate, the proceeds of which are used to purchase and or to construct commercial or residential real estate. The value of some mortgage-backed securities may be particularly sensitive to changes in prevailing interest rates. The value of these securities may fluctuate in response to the market’s perception of the creditworthiness of the issuers. Additionally, although certain mortgage-related securities are supported by

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

some form of government or private guarantee and/or insurance, there is no assurance that private guarantors or insurers will meet their obligations.

(i) Leverage. The Fund may seek to enhance the level of its current distributions to holders of common stock through the use of leverage. The Fund may use leverage directly at the Fund level through borrowings, including loans from certain financial institutions or through a qualified government sponsored program, the use of reverse repurchase agreements and/or the issuance of debt securities (collectively, “Borrowings”), and through the issuance of preferred stock (“Preferred Stock”), in an aggregate amount of up to approximately 33 1/3% of the Fund’s Total Assets immediately after such Borrowings and/or issuances of Preferred Stock. “Total Assets” for this purpose means the Fund’s total assets less all liabilities and indebtedness not represented by senior securities. In addition, the Fund may enter into additional reverse repurchase agreements and/or use similar investment management techniques that may provide leverage, but which are not subject to the foregoing 33 1/3% limitation to the extent that the Fund elects to treat such repurchase agreements and similar financing transactions as “derivative transactions” under Rule 18f-4 of the 1940 Act.

(j) Cash flow information. The Fund invests in securities and distributes dividends from net investment income and net realized gains, which are paid in cash and may be reinvested at the discretion of shareholders. These activities are reported in the Statements of Changes in Net Assets and additional information on cash receipts and cash payments is presented in the Statement of Cash Flows.

(k) Credit and market risk. Investments in securities that are collateralized by real estate mortgages are subject to certain credit and liquidity risks. When market conditions result in an increase in default rates of the underlying mortgages and the foreclosure values of underlying real estate properties are materially below the outstanding amount of these underlying mortgages, collection of the full amount of accrued interest and principal on these investments may be doubtful. Such market conditions may significantly impair the value and liquidity of these investments and may result in a lack of correlation between their credit ratings and values.

(l) Foreign investment risks. The Fund’s investments in foreign securities may involve risks not present in domestic investments. Since securities may be denominated in foreign currencies, may require settlement in foreign currencies or may pay interest or dividends in foreign currencies, changes in the relationship of these foreign currencies to the U.S. dollar can significantly affect the value of the investments and earnings of the Fund. Foreign investments may also subject the Fund to foreign government exchange restrictions, expropriation, taxation or other political, social or economic developments, all of which affect the market and/or credit risk of the investments.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Notes to financial statements (unaudited) (cont’d)

(m) Counterparty risk and credit-risk-related contingent features of derivative instruments. The Fund may invest in certain securities or engage in other transactions where the Fund is exposed to counterparty credit risk in addition to broader market risks. The Fund may invest in securities of issuers, which may also be considered counterparties as trading partners in other transactions. This may increase the risk of loss in the event of default or bankruptcy by the counterparty or if the counterparty otherwise fails to meet its contractual obligations. The Fund’s subadviser attempts to mitigate counterparty risk by (i) periodically assessing the creditworthiness of its trading partners, (ii) monitoring and/or limiting the amount of its net exposure to each individual counterparty based on its assessment and (iii) requiring collateral from the counterparty for certain transactions. Market events and changes in overall economic conditions may impact the assessment of such counterparty risk by the subadviser. In addition, declines in the values of underlying collateral received may expose the Fund to increased risk of loss.

With exchange traded and centrally cleared derivatives, there is less counterparty risk to the Fund since the exchange or clearinghouse, as counterparty to such instruments, guarantees against a possible default. The clearinghouse stands between the buyer and the seller of the contract; therefore, the credit risk is limited to failure of the clearinghouse. While offset rights may exist under applicable law, the Fund does not have a contractual right of offset against a clearing broker or clearinghouse in the event of a default of the clearing broker or clearinghouse.

The Fund has entered into master agreements, such as an International Swaps and Derivatives Association, Inc. Master Agreement (“ISDA Master Agreement”) or similar agreement, with certain of its derivative counterparties that govern over-the-counter (“OTC”) derivatives and provide for general obligations, representations, agreements, collateral posting terms, netting provisions in the event of default or termination and credit related contingent features. The credit related contingent features include, but are not limited to, a percentage decrease in the Fund’s net assets or net asset value per share over a specified period of time. If these credit related contingent features were triggered, the derivatives counterparty could terminate the positions and demand payment or require additional collateral.

Under an ISDA Master Agreement, the Fund may, under certain circumstances, offset with the counterparty certain derivative financial instruments’ payables and/or receivables with collateral held and/or posted and create one single net payment. However, absent an event of default by the counterparty or a termination of the agreement, the terms of the ISDA Master Agreements do not result in an offset of reported amounts of financial assets and financial liabilities in the Statement of Assets and Liabilities across transactions between the Fund and the applicable counterparty. The enforceability of the right to offset may vary by jurisdiction.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Collateral requirements differ by type of derivative. Collateral or margin requirements are set by the broker or exchange clearinghouse for exchange traded derivatives while collateral terms are contract specific for OTC traded derivatives. Cash collateral that has been pledged to cover obligations of the Fund under derivative contracts, if any, will be reported separately in the Statement of Assets and Liabilities. Securities pledged as collateral, if any, for the same purpose are noted in the Schedule of Investments.

As of June 30, 2024, the Fund did not have any open OTC derivative transactions with credit related contingent features in a net liability position.

(n) Security transactions and investment income. Security transactions are accounted for on a trade date basis. Interest income (including interest income from payment-in-kind securities) is recorded on the accrual basis. Amortization of premiums and accretion of discounts on debt securities are recorded to interest income over the lives of the respective securities, except for premiums on certain callable debt securities, which are amortized to the earliest call date. The Fund accretes market discounts and amortizes market premiums on debt securities using the effective yield method. Accretion of market discounts and amortization of market premiums requires the application of several assumptions including, but not limited to, prepayment assumptions and default rate assumptions, which are reevaluated not less than semi-annually and require the use of a significant amount of judgment. Principal write-offs are generally treated as realized losses. The Fund’s accretion of discounts and amortization of premiums for U.S. federal and other tax purposes is likely to differ from the financial accounting treatment under GAAP of these items as described above. Dividend income is recorded on the ex-dividend date for dividends received in cash and/or securities. The cost of investments sold is determined by use of the specific identification method. To the extent any issuer defaults or a credit event occurs that impacts the issuer, the Fund may halt any additional interest income accruals and consider the realizability of interest accrued up to the date of default or credit event.

(o) Partnership accounting policy. The Fund records its pro rata share of the income (loss) and capital gains (losses), to the extent of distributions it has received, allocated from the underlying partnerships and accordingly adjusts the cost basis of the underlying partnerships for return of capital. These amounts are included in the Fund’s Statement of Operations.

(p) Distributions to shareholders. Distributions from net investment income of the Fund, if any, are declared quarterly and paid on a monthly basis. The actual source of the Fund’s monthly distributions may be from net investment income, return of capital or a combination of both. Shareholders will be informed of the tax characteristics of the distributions after the close of the fiscal year. Distributions of net realized gains, if any, are declared at least annually. Distributions to shareholders of the Fund are recorded on the ex-dividend date and are determined in accordance with income tax regulations, which may differ from GAAP.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Notes to financial statements (unaudited) (cont’d)

(q) Compensating balance arrangements. The Fund has an arrangement with its custodian bank whereby a portion of the custodian’s fees is paid indirectly by credits earned on the Fund’s cash on deposit with the bank.

(r) Federal and other taxes. It is the Fund’s policy to comply with the federal income and excise tax requirements of the Internal Revenue Code of 1986 (the “Code”), as amended, applicable to regulated investment companies. Accordingly, the Fund intends to distribute its taxable income and net realized gains, if any, to shareholders in accordance with timing requirements imposed by the Code. Therefore, no federal or state income tax provision is required in the Fund’s financial statements.

Management has analyzed the Fund’s tax positions taken on income tax returns for all open tax years and has concluded that as of December 31, 2023, no provision for income tax is required in the Fund’s financial statements. The Fund’s federal and state income and federal excise tax returns for tax years for which the applicable statutes of limitations have not expired are subject to examination by the Internal Revenue Service and state departments of revenue.

(s) Reclassification. GAAP requires that certain components of net assets be reclassified to reflect permanent differences between financial and tax reporting. These reclassifications have no effect on net assets or net asset value per share.

2. Investment management agreement and other transactions with affiliates

Franklin Templeton Fund Adviser, LLC (“FTFA”) is the Fund’s investment manager. Western Asset Management Company, LLC (“Western Asset”) and Western Asset Management Company Limited (“Western Asset London”) are the Fund’s subadvisers. FTFA, Western Asset and Western Asset London are indirect, wholly-owned subsidiaries of Franklin Resources, Inc. (“Franklin Resources”).

Under the investment management agreement, the Fund pays an investment management fee, calculated daily and paid monthly, at an annual rate of 1.00% of the Fund’s average daily managed assets. Managed assets are net assets plus the proceeds of any outstanding borrowings used for leverage and assets attributable to preferred stock that may be outstanding.

FTFA provides administrative and certain oversight services to the Fund. FTFA delegates to Western Asset the day-to-day portfolio management of the Fund. Western Asset London provides certain subadvisory services to the Fund relating to currency transactions and investments in non-U.S. dollar denominated debt securities. For its services, FTFA pays Western Asset a fee monthly, at an annual rate equal to 70% of the net management fee it receives from the Fund. In turn, Western Asset pays Western Asset London a monthly subadvisory fee in an amount equal to 100% of the management fee paid to Western Asset on the assets that Western Asset allocates to Western Asset London to manage.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

During periods in which the Fund utilizes financial leverage, the fees paid to FTFA will be higher than if the Fund did not utilize leverage because the fees are calculated as a percentage of the Fund’s assets, including those investments purchased with leverage.

The manager has agreed to waive the Fund’s management fee to an extent sufficient to offset the net management fee payable in connection with any investment in an affiliated money market fund (the “affiliated money market fund waiver”).

FTFA implemented an investment management fee waiver of 0.20% that terminated on January 2, 2022. Effective January 3, 2022, FTFA implemented an investment management fee waiver of 0.05% that expired on May 31, 2023. Effective June 1, 2023, FTFA implemented an investment management fee waiver of 0.10% that continued until May 31, 2024. Effective June 1, 2024, FTFA implemented an investment management fee waiver of 0.05% that terminates on May 31, 2025.

During the six months ended June 30, 2024, fees waived and/or expenses reimbursed amounted to $113,002, which included an affiliated money market fund waiver of $1,204.

All officers and one Director of the Fund are employees of Franklin Resources or its affiliates and do not receive compensation from the Fund.

3. Investments

During the six months ended June 30, 2024, the aggregate cost of purchases and proceeds from sales of investments (excluding short-term investments) and U.S. Government & Agency Obligations were as follows:

	Investments	U.S. Government & Agency Obligations
Purchases	$46,956,986	$9,741,559
Sales	33,402,446	10,106,263

At June 30, 2024, the aggregate cost of investments and the aggregate gross unrealized appreciation and depreciation of investments for federal income tax purposes were substantially as follows:

	Cost	Gross Unrealized Appreciation	Gross Unrealized Depreciation	Net Unrealized Appreciation (Depreciation)
Securities	$267,865,215	$12,702,437	$(27,649,957)	$(14,947,520)
Futures contracts	—	—	(149,600)	(149,600)
Forward foreign currency contracts	—	120,601	—	120,601

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Notes to financial statements (unaudited) (cont’d)

Transactions in reverse repurchase agreements for the Fund during the six months ended June 30, 2024, were as follows:

Average Daily Balance*	Weighted Average Interest Rate*	Maximum Amount Outstanding
$107,926,236	7.344%	$113,904,000

* Averages based on the number of days that the Fund had reverse repurchase agreements outstanding.

Interest rates on reverse repurchase agreements ranged from 7.309% to 7.406% during the six months ended June 30, 2024. Interest expense incurred on reverse repurchase agreements totaled $4,006,831.

4. Derivative instruments and hedging activities

Below is a table, grouped by derivative type, that provides information about the fair value and the location of derivatives within the Statement of Assets and Liabilities at June 30, 2024.

ASSET DERIVATIVES1
	Foreign Exchange Risk
Forward foreign currency contracts	$120,601

LIABILITY DERIVATIVES1
	Interest Rate Risk
Futures contracts2	$149,600

1	Generally, the balance sheet location for asset derivatives is receivables/net unrealized appreciation and for liability derivatives is payables/net unrealized depreciation.
2	Includes cumulative unrealized appreciation (depreciation) of futures contracts as reported in the Schedule of Investments. Only net variation margin is reported within the receivables and/or payables on the Statement of Assets and Liabilities.

The following tables provide information about the effect of derivatives and hedging activities on the Fund’s Statement of Operations for the six months ended June 30, 2024. The first table provides additional detail about the amounts and sources of gains (losses) realized on derivatives during the period. The second table provides additional information about the change in net unrealized appreciation (depreciation) resulting from the Fund’s derivatives and hedging activities during the period.

AMOUNT OF NET REALIZED GAIN (LOSS) ON DERIVATIVES RECOGNIZED
	Interest Rate Risk	Foreign Exchange Risk	Total
Futures contracts	$(25,796 )	—	$(25,796 )
Forward foreign currency contracts	—	$18,674	18,674
Total	$(25,796 )	$18,674	$(7,122 )

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

CHANGE IN NET UNREALIZED APPRECIATION (DEPRECIATION) ON DERIVATIVES RECOGNIZED
	Interest Rate Risk	Foreign Exchange Risk	Total
Futures contracts	$788,277	—	$788,277
Forward foreign currency contracts	—	$120,601	120,601
Total	$788,277	$120,601	$908,878

During the six months ended June 30, 2024, the volume of derivative activity for the Fund was as follows:

	Average Market Value
Futures contracts (to buy)†	$1,925,700
Futures contracts (to sell)	36,444,559
Forward foreign currency contracts (to sell)	7,731,652

†	At June 30, 2024, there were no open positions held in this derivative.

The following table presents the Fund’s OTC derivative assets and liabilities by counterparty net of amounts available for offset under an ISDA Master Agreement and net of the related collateral pledged (received) by the Fund as of June 30, 2024.

Counterparty	Gross Assets Subject to Master Agreements1	Gross Liabilities Subject to Master Agreements	Net Assets (Liabilities) Subject to Master Agreements	Collateral Pledged (Received)	Net Amount2
Morgan Stanley & Co. Inc.	$120,601	—	$120,601	—	$120,601

1	Absent an event of default or early termination, derivative assets and liabilities are presented gross and not offset in the Statement of Assets and Liabilities.
2	Represents the net amount receivable (payable) from (to) the counterparty in the event of default.

5. Distributions subsequent to June 30, 2024

The following distributions have been declared by the Fund’s Board of Directors and are payable subsequent to the period end of this report:

Record Date	Payable Date	Amount
6/21/2024	7/1/2024	$0.1300
7/24/2024	8/1/2024	$0.1300
8/23/2024	9/3/2024	$0.1300
9/23/2024	10/1/2024	$0.1300
10/24/2024	11/1/2024	$0.1300
11/21/2024	12/2/2024	$0.1300

6. Stock repurchase program

On November 16, 2015, the Fund announced that the Fund’s Board of Directors (the “Board”) had authorized the Fund to repurchase in the open market up to approximately 10% of the

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Notes to financial statements (unaudited) (cont’d)

Fund’s outstanding common stock when the Fund’s shares are trading at a discount to net asset value. The Board has directed management of the Fund to repurchase shares of common stock at such times and in such amounts as management reasonably believes may enhance stockholder value. The Fund is under no obligation to purchase shares at any specific discount levels or in any specific amounts.

During the six months ended June 30, 2024, the Fund did not repurchase any shares. During the year ended December 31, 2023, the Fund repurchased and retired 0.12% of its common shares outstanding under the repurchase plan. The weighted average discount per share on these repurchases was 16.45% for the year ended December 31, 2023. Shares repurchased and the corresponding dollar amount are included in the Statements of Changes in Net Assets. The anti-dilutive impact of these share repurchases is included in the Financial Highlights.

Since the commencement of the stock repurchase program through June 30, 2024, the Fund repurchased 81,710 shares or 0.71% of its common shares outstanding for a total amount of $898,285.

7. Capital shares

The Fund filed a registration statement with the Securities and Exchange Commission, effective May 4, 2021, authorizing the Fund to offer and sell shares of common stock having an aggregate offering price of up to $43,283,467. Under the equity shelf offering program, the Fund, subject to market conditions, may raise additional equity capital from time to time in varying amounts and offering methods at a net price at or above the Fund’s then-current net asset value per common share. Costs incurred by the Fund in connection with the shelf offering are recorded as a prepaid expense. These costs are amortized on a pro-rata basis as shares are sold and are presented as a reduction to the Net proceeds from sale of shares on the Statement of Changes in Net Assets. Any deferred charges remaining at the end of the life of the shelf offering period will be expensed. For the six months ended June 30, 2024, and the year ended December 31, 2023, there were no shares sold.

8. Transactions with affiliated company

As defined by the 1940 Act, an affiliated company is one in which the Fund owns 5% or more of the outstanding voting securities, or a company which is under common ownership or control with the Fund. The following company was considered an affiliated company for

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

all or some portion of the six months ended June 30, 2024. The following transactions were effected in such company for the six months ended June 30, 2024.

	Affiliate Value at December 31, 2023	Purchased		Sold
	Affiliate Value at December 31, 2023	Cost	Shares	Proceeds	Shares
Western Asset Premier Institutional Government Reserves, Premium Shares	$564,509	$44,032,779	44,032,779	$42,319,156	42,319,156

(cont’d)	Realized Gain (Loss)	Dividend Income	Net Increase (Decrease) in Unrealized Appreciation (Depreciation)	Affiliate Value at June 30, 2024
Western Asset Premier Institutional Government Reserves, Premium Shares	—	$64,884	—	$2,278,132

9. Deferred capital losses

As of December 31, 2023, the Fund had deferred capital losses of $29,350,330, which have no expiration date, that will be available to offset future taxable capital gains.

10. Recent accounting pronouncement

In March 2020, the FASB issued Accounting Standards Update (ASU) No. 2020-04, Reference Rate Reform (Topic 848) – Facilitation of the Effects of Reference Rate Reform on Financial Reporting. In January 2021 and December 2022, the FASB issued ASU No. 2021-01 and ASU No. 2022-06, with further amendments to Topic 848. The amendments in the ASUs provide optional temporary accounting recognition and financial reporting relief from the effect of certain types of contract modifications due to the planned discontinuation of the London Interbank Offered Rate (LIBOR) and other interbank-offered based reference rates as of the end of 2021 for certain LIBOR settings and 2023 for the remainder. The ASUs are effective for certain reference rate-related contract modifications that occur during the period March 12, 2020, through December 31, 2024. Management has reviewed the requirements and believes the adoption of these ASUs will not have a material impact on the financial statements.

Western Asset Mortgage Opportunity Fund Inc. 2024 Semi-Annual Report

Board approval of management and

subadvisory agreements (unaudited)

Background

The Investment Company Act of 1940, as amended (the “1940 Act”), requires that the Board of Directors (the “Board”) of Western Asset Mortgage Opportunity Fund Inc. (the “Fund”), including a majority of its members who are not considered to be “interested persons” under the 1940 Act (the “Independent Directors”) voting separately, approve on an annual basis the continuation of the investment management agreement (the “Management Agreement”) between the Fund and the Fund’s manager, Franklin Templeton Fund Adviser, LLC (formerly, Legg Mason Partners Fund Advisor, LLC) (the “Manager”), and the sub-advisory agreements (individually, a “Sub-Advisory Agreement,” and collectively, the “Sub-Advisory Agreements”) with the Manager’s affiliates, Western Asset Management Company, LLC (“Western Asset”) and Western Asset Management Company Limited (“Western Asset London,” and together with Western Asset, the “Sub-Advisers”), with respect to the Fund.

At an in-person meeting (the “Contract Renewal Meeting”) held on May 20-21, 2024, the Board, including the Independent Directors, considered and approved the continuation of each of the Management Agreement and the Sub-Advisory Agreements for an additional one-year period. To assist in its consideration of the renewal of each of the Management Agreement and the Sub-Advisory Agreements, the Board received and considered extensive information (together with the information provided at the Contract Renewal Meeting, the “Contract Renewal Information”) about the Manager and the Sub-Advisers, as well as the management and sub-advisory arrangements for the Fund and the other closed-end funds in the same complex under the Board’s purview (the “Franklin Templeton Closed-end Funds”), certain portions of which are discussed below.

A presentation made by the Manager and the Sub-Advisers to the Board at the Contract Renewal Meeting in connection with the Board’s evaluation of each of the Management Agreement and the Sub-Advisory Agreements encompassed the Fund and other Franklin Templeton Closed-end Funds. In addition to the Contract Renewal Information, the Board received performance and other information throughout the year related to the respective services rendered by the Manager and the Sub-Advisers to the Fund. The Board’s evaluation took into account the information received throughout the year and also reflected the knowledge and experience gained as members of the Boards of the Fund and other Franklin Templeton Closed-end Funds with respect to the services provided to the Fund by the Manager and the Sub-Advisers. The information received and considered by the Board (including its various committees) in conjunction with both the Contract Renewal Meeting and throughout the year was both written and oral. The contractual arrangements discussed below are the product of multiple years of review and negotiation and information received and considered by the Board during each of those years.

Western Asset Mortgage Opportunity Fund Inc.

At a meeting held by on April 26, 2024, the Independent Directors, in preparation for the Contract Renewal Meeting, met in a private session with their independent legal counsel to review the Contract Renewal Information regarding the Franklin Templeton Closed-end Funds, including the Fund, received to date. No representatives of the Manager or the Sub-Advisers participated in this meeting. Following the April 26, 2024 meeting, the Independent Directors submitted certain questions and requests for additional information to Fund management. The Independent Directors also met in private sessions with their independent legal counsel to consider the Contract Renewal Information and Fund management’s responses to the Independent Directors’ questions and requests for additional information in advance of and during the Contract Renewal Meeting. The discussion below reflects all of these reviews.

The Manager provides the Fund with investment advisory and administrative services pursuant to the Management Agreement and the Sub-Advisers together provide the Fund with investment sub-advisory services pursuant to the Sub-Advisory Agreements. The discussion below covers both the advisory and administrative functions being rendered by the Manager, each such function being encompassed by the Management Agreement, and the investment sub-advisory functions being rendered by the Sub-Advisers pursuant to the Sub-Advisory Agreements.

Board Approval of Management Agreement and Sub-Advisory Agreements

The Independent Directors were advised by separate independent legal counsel throughout the process. Prior to voting, the Independent Directors received a memorandum discussing the legal standards for their consideration of the proposed continuation of the Management Agreement and the Sub-Advisory Agreements. The Independent Directors considered the Management Agreement and each Sub-Advisory Agreement separately during the course of their review. In doing so, they noted the respective roles of the Manager and the Sub-Advisers in providing services to the Fund.

In approving the continuation of the Management Agreement and Sub-Advisory Agreements, the Board, including the Independent Directors, considered a variety of factors, including those factors discussed below. No single factor reviewed by the Board was identified by the Board as the principal factor in determining whether to approve the continuation of the Management Agreement and the Sub-Advisory Agreements. Each Director may have attributed different weight to the various factors in evaluating the Management Agreement and the Sub-Advisory Agreements.

After considering all relevant factors and information, the Board, exercising its reasonable business judgment, determined that the continuation of the Management Agreement and Sub-Advisory Agreements were in the best interests of the Fund’s stockholders and approved the continuation of each such agreement for an additional one-year period.

Western Asset Mortgage Opportunity Fund Inc.

Board approval of management and

subadvisory agreements (unaudited) (cont’d)

Nature, Extent and Quality of the Services under the Management Agreement and Sub-Advisory Agreements

The Board received and considered Contract Renewal Information regarding the nature, extent, and quality of services provided to the Fund by the Manager and the Sub-Advisers under the Management Agreement and the Sub-Advisory Agreements, respectively, during the past year. The Board noted information received at regular meetings throughout the year related to the services provided by the Manager in its management of the Fund’s affairs and the Manager’s role in coordinating the activities of the Sub-Advisers and the Fund’s other service providers. The Board observed that the scope of services provided by the Manager and the Sub-Advisers, and of the undertakings required of the Manager and Sub-Advisers in connection with those services, including maintaining and monitoring their respective compliance programs as well as the Fund’s compliance programs, had expanded over time as a result of regulatory, market and other developments. The Board also noted that on a regular basis it received and reviewed information from the Manager and the Sub-Advisers regarding the Fund’s compliance policies and procedures established pursuant to Rule 38a-1 under the 1940 Act. The Board also considered the risks borne by the Manager, the Sub-Advisers and their respective affiliates on behalf of the Fund, including entrepreneurial, operational, reputational, litigation and regulatory risks, as well as the Manager’s and the Sub-Advisers’ risk management processes.

The Board reviewed the qualifications, backgrounds, and responsibilities of the Manager’s senior personnel and the Sub-Advisers’ portfolio management teams primarily responsible for the day-to-day portfolio management of the Fund. The Board also considered, based on its knowledge of the Manager and its affiliates, the financial resources of Franklin Resources, Inc., the parent organization of the Manager and the Sub-Advisers. The Board recognized the importance of having a fund manager with significant resources.

The Board considered the division of responsibilities between the Manager and the Sub-Advisers under the Management Agreement and the Sub-Advisory Agreements, respectively, including the Manager’s coordination and oversight of the services provided to the Fund by the Sub-Advisers and other fund service providers and Western Asset’s coordination and oversight of the services provided to the Fund by Western Asset London. The Management Agreement permits the Manager to delegate certain of its responsibilities, including its investment advisory duties thereunder, provided that the Manager, in each case, will supervise the activities of the delegee.

In reaching its determinations regarding continuation of the Management Agreement and the Sub-Advisory Agreements, the Board took into account that Fund stockholders, in pursuing their investment goals and objectives, may have purchased their shares of the

Western Asset Mortgage Opportunity Fund Inc.

Fund based upon the reputation and the investment style, philosophy and strategy of the Manager and the Sub-Advisers, as well as the resources available to the Manager and the Sub-Advisers.

The Board concluded that, overall, the nature, extent, and quality of the management and other services provided (and expected to be provided) to the Fund, under the Management Agreement and the Sub-Advisory Agreements were satisfactory.

Fund Performance

The Board received and considered information regarding Fund performance, including information and analyses (the “Broadridge Performance Information”) for the Fund, as well as for a group of comparable funds (the “Performance Universe”) selected by Broadridge Financial Solutions, Inc. (“Broadridge”), an independent third-party provider of investment company data. The Board was provided with a description of the methodology Broadridge used to determine the similarity of the Fund with the funds included in the Performance Universe. It was noted that while the Board found the Broadridge Performance Information generally useful, they recognized its limitations, including that the data may vary depending on the end date selected, and that the results of the performance comparisons may vary depending on the selection of the peer group and its composition over time. The Board also noted that Board members had received and discussed with the Manager and the Sub-Advisers information throughout the year at periodic intervals comparing the Fund’s performance against its benchmark and against the Fund’s peers. In addition, the Board considered the Fund’s performance in view of overall financial market conditions.

The Broadridge Performance Information comparing the Fund’s performance to that of its Performance Universe, consisting of the Fund and all leveraged closed-end U.S. mortgage funds, regardless of asset size, showed, among other data, that based on net asset value per share, the Fund’s performance was above the median for the 1-, 3- and 10-year periods ended December 31, 2023, and was below the median for the 5-year period ended December 31, 2023. The Board noted the explanations from the Manager and the Sub-Advisers regarding the Fund’s relative performance versus the Performance Universe for the various periods. The Board also noted the limited size of the Performance Universe.

Based on the reviews and discussions of Fund performance and considering other relevant factors, including an agreement at the Contract Renewal Meeting by the Manager to implement a voluntary fee waiver of 0.05% through May 31, 2025 (the “Fee Waiver”) and other factors noted above, the Board concluded, under the circumstances, that continuation of the Management Agreement and the Sub-Advisory Agreements for an additional one-year period would be consistent with the interests of the Fund and its stockholders.

Western Asset Mortgage Opportunity Fund Inc.

Board approval of management and

subadvisory agreements (unaudited) (cont’d)

Management and Sub-Advisory Fees and Expense Ratios

The Board reviewed and considered the contractual management fee (the “Contractual Management Fee”) and the actual management fee (the “Actual Management Fee”) payable by the Fund to the Manager under the Management Agreement and the sub-advisory fees (the “Sub-Advisory Fees”) payable by the Manager to the Sub-Advisers under the Sub-Advisory Agreements in view of the nature, extent and overall quality of the management, investment advisory and other services provided by the Manager and the Sub-Advisers, respectively. The Board noted that the Sub-Advisory Fee payable to Western Asset under its Sub-Advisory Agreement with the Manager is paid by the Manager, not the Fund, and, accordingly, that the retention of Western Asset does not increase the fees or expenses otherwise incurred by the Fund’s stockholders. Similarly, the Board noted that the Sub-Advisory Fee payable to Western Asset London under its Sub-Advisory Agreement with Western Asset is paid by Western Asset, not the Fund, and, accordingly, that the retention of Western Asset London does not increase the fees or expenses otherwise incurred by the Fund’s stockholders.

In addition, the Board received and considered information and analyses prepared by Broadridge (the “Broadridge Expense Information”) comparing the Contractual Management Fee and the Actual Management Fee and the Fund’s total actual expenses with those of funds in an expense universe (the “Expense Universe”) selected and provided by Broadridge. The comparison was based upon the constituent funds’ latest fiscal years. It was noted that while the Board found the Broadridge Expense Information generally useful, they recognized its limitations, including that the data may vary depending on the selection of the peer group.

The Broadridge Expense Information showed that the Fund’s Contractual Management Fee was above the median. The Broadridge Expense Information also showed that the Fund’s Actual Management Fee was above the median based on both common share assets and leveraged assets. The Broadridge Expense Information also showed that the Fund’s actual total expenses were above the median on the basis of both common share assets and leveraged assets. The Board took into account management’s discussion of the Fund’s expenses and noted the limited size of the Expense Group. The Board also considered the Manager’s agreement to implement the Fee Waiver through May 31, 2025.

The Board also reviewed Contract Renewal Information regarding fees charged by the Manager and/or the Sub-Advisers to other U.S. clients investing primarily in an asset class similar to that of the Fund, including, where applicable, institutional and separate accounts. The Manager reviewed with the Board the differences in services provided to these different types of accounts, noting that the Fund is provided with certain administrative services, office facilities, and Fund officers, and that the Fund is subject not only to heightened regulatory requirements relative to institutional clients but also to requirements

Western Asset Mortgage Opportunity Fund Inc.

for listing on the New York Stock Exchange, and that the Manager coordinates and oversees the provision of services to the Fund by other fund service providers. The Board considered the fee comparisons in view of the different services provided in managing these other types of clients and funds.

The Board considered the overall management fee, the fees of the Sub-Advisers and the amount of the management fee retained by the Manager after payment of the subadvisory fees in each case in view of the services rendered for those amounts. The Board also received an analysis of complex-wide management fees provided by the Manager, which, among other things, set out a framework of fees based on asset classes.

Taking all of the above into consideration, as well as the factors identified below, the Board determined that the management fee and the Sub-Advisory Fees were reasonable in view of the nature, extent and overall quality of the management, investment advisory and other services provided by the Manager and the Sub-Advisers to the Fund under the Management Agreement and the Sub-Advisory Agreements, respectively.

Manager Profitability

The Board, as part of the Contract Renewal Information, received an analysis of the profitability to the Manager and its affiliates in providing services to the Fund for the Manager’s fiscal years ended September 30, 2023 and September 30, 2022. The Board also received profitability information with respect to the Franklin Templeton fund complex as a whole. In addition, the Board received Contract Renewal Information with respect to the Manager’s revenue and cost allocation methodologies used in preparing such profitability data. It was noted that the allocation methodologies had been reviewed by an outside consultant. The profitability to each of the Sub-Advisers was not considered to be a material factor in the Board’s considerations since the Sub-Advisory Fee is paid by the Manager in the case of Western Asset and by Western Asset in the case of Western Asset London, not the Fund, although the Board noted the affiliation of the Manager with the Sub-Advisers. The profitability of the Manager and its affiliates was considered by the Board to be reasonable in view of the nature, extent and quality of services provided to the Fund.

Economies of Scale

The Board received and discussed Contract Renewal Information concerning whether the Manager realizes economies of scale if the Fund’s assets grow. The Board noted that because the Fund is a closed-end fund it has limited ability to increase its assets. The Board determined that the management fee structure was appropriate under the circumstances. For similar reasons as stated above with respect to the Sub-Advisers’ profitability and the costs of the Sub-Advisers’ provision of services, the Board did not consider the potential for economies of scale in the Sub-Advisers’ management of the Fund to be a material factor in the Board’s consideration of the Sub-Advisory Agreements.

Western Asset Mortgage Opportunity Fund Inc.

Dividend reinvestment plan (unaudited)

Unless you elect to receive distributions in cash (i.e., opt-out), all dividends, including any capital gain dividends and return of capital distributions, on your Common Stock will be automatically reinvested by Computershare Trust Company, N.A., as agent for the stock- holders (the “Plan Agent”), in additional shares of Common Stock under the Fund’s Dividend Reinvestment Plan (the “Plan”). You may elect not to participate in the Plan by contacting the Plan Agent. If you do not participate, you will receive all cash distributions paid by check mailed directly to you by Computershare Trust Company, N.A., as dividend paying agent.

If you participate in the Plan, the number of shares of Common Stock you will receive will be determined as follows:

(1) If the market price of the Common Stock (plus $0.03 per share commission) on the payment date (or, if the payment date is not a NYSE trading day, the immediately preceding trading day) is equal to or exceeds the net asset value per share of the Common Stock at the close of trading on the NYSE on the payment date, the Fund will issue new Common Stock at a price equal to the greater of (a) the net asset value per share at the close of trading on the NYSE on the payment date or (b) 95% of the market price per share of the Common Stock on the payment date.

(2) If the net asset value per share of the Common Stock exceeds the market price of the Common Stock (plus $0.03 per share commission) at the close of trading on the NYSE on the payment date, the Plan Agent will receive the dividend or distribution in cash and will buy Common Stock in the open market, on the NYSE or elsewhere, for your account as soon as practicable commencing on the trading day following the payment date and terminating no later than the earlier of (a) 30 days after the dividend or distribution payment date, or (b) the payment date for the next succeeding dividend or distribution to be made to the stockholders; except when necessary to comply with applicable provisions of the federal securities laws. If during this period: (i) the market price (plus $0.03 per share commission) rises so that it equals or exceeds the net asset value per share of the Common Stock at the close of trading on the NYSE on the payment date before the Plan Agent has completed the open market purchases or (ii) if the Plan Agent is unable to invest the full amount eligible to be reinvested in open market purchases, the Plan Agent will cease purchasing Common Stock in the open market and the Fund shall issue the remaining Common Stock at a price per share equal to the greater of (a) the net asset value per share at the close of trading on the NYSE on the day prior to the issuance of shares for reinvestment or (b) 95% of the then current market price per share.

Common Stock in your account will be held by the Plan Agent in non-certificated form. Any proxy you receive will include all shares of Common Stock you have received under the Plan. You may withdraw from the Plan (i.e., opt-out) by notifying the Plan Agent in writing at P.O. Box 43006, Providence, RI 02940-3078 or by calling the Plan Agent at 1-888-888-0151. Such withdrawal will be effective immediately if notice is received by the Plan Agent not less than ten business days prior to any dividend or distribution record date; otherwise such

Western Asset Mortgage Opportunity Fund Inc.

Dividend reinvestment plan (unaudited) (cont’d)

withdrawal will be effective as soon as practicable after the Plan Agent’s investment of the most recently declared dividend or distribution on the Common Stock.

Plan participants who sell their shares will be charged a service charge (currently $5.00 per transaction) and the Plan Agent is authorized to deduct brokerage charges actually incurred from the proceeds (currently $0.05 per share commission). There is no service charge for reinvestment of your dividends or distributions in Common Stock. However, all participants will pay a pro rata share of brokerage commissions incurred by the Plan Agent when it makes open market purchases. Because all dividends and distributions will be automatically reinvested in additional shares of Common Stock, this allows you to add to your investment through dollar cost averaging, which may lower the average cost of your Common Stock over time. Dollar cost averaging is a technique for lowering the average cost per share over time if the Fund’s net asset value declines. While dollar cost averaging has definite advantages, it cannot assure profit or protect against loss in declining markets.

Automatically reinvesting dividends and distributions does not mean that you do not have to pay income taxes due upon receiving dividends and distributions. Investors will be subject to income tax on amounts reinvested under the Plan.

The Fund reserves the right to amend or terminate the Plan if, in the judgment of the Board of Directors, the change is warranted. The Plan may be terminated, amended or supplemented by the Fund upon notice in writing mailed to stockholders at least 30 days prior to the record date for the payment of any dividend or distribution by the Fund for which the termination or amendment is to be effective. Upon any termination, you will be sent cash for any fractional share of Common Stock in your account. You may elect to notify the Plan Agent in advance of such termination to have the Plan Agent sell part or all of your Common Stock on your behalf. Additional information about the Plan and your account may be obtained from the Plan Agent at P.O. Box 43006, Providence, RI 02940-3078 or by calling the Plan Agent at 1-888-888-0151.

Western Asset Mortgage Opportunity Fund Inc.

Western Asset

Mortgage Opportunity Fund Inc.

Directors

Robert D. Agdern

Carol L. Colman

Daniel P. Cronin

Paolo M. Cucchi

Eileen A. Kamerick

Nisha Kumar

Jane Trust
Chairman

Officers

Jane Trust
President and Chief Executive
Officer

Christopher Berarducci
Treasurer and Principal Financial
Officer

Fred Jensen
Chief Compliance Officer

Marc A. De Oliveira
Secretary and Chief Legal Officer

Thomas C. Mandia
Senior Vice President

Jeanne M. Kelly
Senior Vice President

Western Asset Mortgage Opportunity Fund Inc.

620 Eighth Avenue
47th Floor
New York, NY 10018

Investment manager

Franklin Templeton Fund Adviser, LLC

Subadvisers

Western Asset Management Company, LLC

Western Asset Management Company Limited

Custodian

The Bank of New York Mellon

Transfer agent

Computershare Inc.
P.O. Box 43006
Providence, RI 02940-3078

Independent registered
public accounting firm

PricewaterhouseCoopers LLP
Baltimore, MD

Legal counsel

Simpson Thacher & Bartlett LLP
900 G Street NW
Washington, DC 20001

New York Stock
Exchange Symbol

DMO

Franklin Templeton Funds Privacy and Security Notice

Your Privacy and the Security of Your Personal Information is Very Important to Us

This Privacy and Security Notice (the “Privacy Notice”) addresses the Funds’ privacy and data protection practices with respect to nonpublic personal information the Fund receives. The Legg Mason Funds include the Western Asset Money Market Funds (Funds) sold by the Funds’ distributor, Franklin Distributors, LLC, as well as Legg Mason-sponsored closed-end funds. The provisions of this Privacy Notice apply to your information both while you are a shareholder and after you are no longer invested with the Funds.

The Type of Nonpublic Personal Information the Funds Collect About You

The Funds collect and maintain nonpublic personal information about you in connection with your shareholder account. Such information may include, but is not limited to:

•

Personal information included on applications or other forms;

•

Account balances, transactions, and mutual fund holdings and positions;

•

Bank account information, legal documents, and identity verification documentation; and

•

Online account access user IDs, passwords, security challenge question responses.

How the Funds Use Nonpublic Personal Information About You

The Funds do not sell or share your nonpublic personal information with third parties or with affiliates for their marketing purposes, unless you have authorized the Funds to do so. The Funds do not disclose any nonpublic personal information about you except as may be required to perform transactions or services you have authorized or as permitted or required by law. The Funds may disclose information about you to:

•

Employees, agents, and affiliates on a “need to know” basis to enable the Funds to conduct ordinary business or to comply with obligations to government regulators;

•

Service providers, including the Funds’ affiliates, who assist the Funds as part of the ordinary course of business (such as printing, mailing services, or processing or servicing your account with us) or otherwise perform services on the Funds’ behalf, including companies that may perform statistical analysis, market research and marketing services solely for the Funds;

•

Permit access to transfer, whether in the United States or countries outside of the United States to such Funds’ employees, agents and affiliates and service providers as required to enable the Funds to conduct ordinary business, or to comply with obligations to government regulators;

•

The Funds’ representatives such as legal counsel, accountants and auditors to enable the Funds to conduct ordinary business, or to comply with obligations to government regulators;

•

Fiduciaries or representatives acting on your behalf, such as an IRA custodian or trustee of a grantor trust.

NOT PART OF THE SEMI-ANNUAL REPORT

Franklin Templeton Funds Privacy and Security Notice

(cont’d)

Except as otherwise permitted by applicable law, companies acting on the Funds’ behalf, including those outside the United States, are contractually obligated to keep nonpublic personal information the Funds provide to them confidential and to use the information the Funds share only to provide the services the Funds ask them to perform.

The Funds may disclose nonpublic personal information about you when necessary to enforce their rights or protect against fraud, or as permitted or required by applicable law, such as in connection with a law enforcement or regulatory request, subpoena, or similar legal process. In the event of a corporate action or in the event a Fund service provider changes, the Funds may be required to disclose your nonpublic personal information to third parties. While it is the Funds’ practice to obtain protections for disclosed information in these types of transactions, the Funds cannot guarantee their privacy policy will remain unchanged.

Keeping You Informed of the Funds’ Privacy and Security Practices

The Funds will notify you annually of their privacy policy as required by federal law. While the Funds reserve the right to modify this policy at any time, they will notify you promptly if this privacy policy changes.

The Funds’ Security Practices

The Funds maintain appropriate physical, electronic and procedural safeguards designed to guard your nonpublic personal information. The Funds’ internal data security policies restrict access to your nonpublic personal information to authorized employees, who may use your nonpublic personal information for Fund business purposes only.

Although the Funds strive to protect your nonpublic personal information, they cannot ensure or warrant the security of any information you provide or transmit to them, and you do so at your own risk. In the event of a breach of the confidentiality or security of your nonpublic personal information, the Funds will attempt to notify you as necessary so you can take appropriate protective steps. If you have consented to the Funds using electronic communications or electronic delivery of statements, they may notify you under such circumstances using the most current email address you have on record with them.

In order for the Funds to provide effective service to you, keeping your account information accurate is very important. If you believe that your account information is incomplete, not accurate or not current, if you have questions about the Funds’ privacy practices, or our use of your nonpublic personal information, write the Funds using the contact information on your account statements, email the Funds by clicking on the Contact Us section of the Funds’ website at www.franklintempleton.com, or contact the Funds at 1-877-721-1926 for the Western Asset Money Market Funds or 1-888-777-0102 for the Legg Mason-sponsored closed-end funds. For additional information related to certain state privacy rights, please visit https://www.franklintempleton.com/help/privacy-policy.

Revised December 2023.

NOT PART OF THE SEMI-ANNUAL REPORT

Western Asset Mortgage Opportunity Fund Inc.

Western Asset Mortgage Opportunity Fund Inc.
620 Eighth Avenue
47th Floor
New York, NY 10018

Notice is hereby given in accordance with Section 23(c) of the Investment Company Act of 1940, as amended, that from time to time the Fund may purchase, at market prices, shares of its stock.

The Fund files its complete schedule of portfolio holdings with the Securities and Exchange Commission (“SEC”) for the first and third quarters of each fiscal year as an exhibit to its reports on Form N-PORT. The Fund’s Forms N-PORT are available on the SEC’s website at www.sec.gov. To obtain information on Form N-PORT, shareholders can call the Fund at 1-888-777-0102.

Information on how the Fund voted proxies relating to portfolio securities during the prior 12-month period ended June 30th of each year and a description of the policies and procedures that the Fund uses to determine how to vote proxies related to portfolio transactions are available (1) without charge, upon request, by calling 1-888-777-0102, (2) at www.franklintempleton.com and (3) on the SEC’s website at www.sec.gov.

Quarterly performance, semi-annual and annual reports, current net asset value and other information regarding the Fund may be found on Franklin Templeton’s website, which can be accessed at www.franklintempleton.com. Any reference to Franklin Templeton’s website in this report is intended to allow investors public access to information regarding the Fund and does not, and is not intended to, incorporate Franklin Templeton’s website in this report.

This report is transmitted to the shareholders of Western Asset Mortgage Opportunity Fund Inc. for their information. This is not a prospectus, circular or representation intended for use in the purchase of shares of the Fund or any securities mentioned in this report.

Computershare Inc.
P.O. Box 43006
Providence, RI 02940-3078

WASX012835 8/24

On March 1, 2024, Michael C. Buchanan and Simon Miller became part of the portfolio management team of the Fund.

The following tables set forth certain additional information with respect to the above named fund’s investment professional responsible for the day-to-day management with other members of the Fund’s portfolio management team for the fund. Unless noted otherwise, all information is provided as of June 30, 2024.

The table below identifies the number of accounts (other than the fund) for which the below named fund’s investment professional has day-to-day management responsibilities and the total assets in such accounts, within each of the following categories: registered investment companies, other pooled investment vehicles, and other accounts. For each category, the number of accounts and total assets in the accounts where fees are based on performance is also indicated.

‡ The numbers above reflect the overall number of portfolios managed by employees of Western Asset Management Company (“Western Asset”). Western Asset’s investment discipline emphasizes a team approach that combines the efforts of groups of specialists working in different market sectors. They are responsible for overseeing implementation of Western Asset’s overall investment ideas and coordinating the work of the various sector teams. This structure ensures that client portfolios benefit from a consensus that draws on the expertise of all team members.

The Subadviser has adopted compliance policies and procedures to address a wide range of potential conflicts of interest that could directly impact client portfolios. For example, potential conflicts of interest may arise in connection with the management of multiple portfolios (including portfolios managed in a personal capacity). These could include potential conflicts of interest related to the knowledge and timing of a portfolio’s trades, investment opportunities and broker selection. Portfolio managers are privy to the size, timing, and possible market impact of a portfolio’s trades.

It is possible that an investment opportunity may be suitable for both a portfolio and other accounts managed by a portfolio manager, but may not be available in sufficient quantities for both the portfolio and the other accounts to participate fully. Similarly, there may be limited opportunity to sell an investment held by a portfolio and another account. A conflict may arise where the portfolio manager may have an incentive to treat an account preferentially as compared to a portfolio because the account pays a performance-based fee or the portfolio manager, the Subadviser or an affiliate has an interest in the account. The Subadviser has adopted procedures for allocation of portfolio transactions and investment opportunities across multiple client accounts on a fair and equitable basis over time. Eligible accounts that can participate in a trade generally share the same price on a pro-rata allocation basis, taking into account differences based on factors such as cash availability, investment restrictions and guidelines, and portfolio composition versus strategy.

With respect to securities transactions, the Subadviser determines which broker or dealer to use to execute each order, consistent with their duty to seek best execution of the transaction. However, with respect to certain other accounts (such as pooled investment vehicles that are not registered investment companies and other accounts managed for organizations and individuals), the Subadviser may be limited by the client with respect to the selection of brokers or dealers or may be instructed to direct trades through a particular broker or dealer. In these cases, trades for a portfolio in a particular security may be placed separately from, rather than aggregated with, such other accounts. Having separate transactions with respect to a security may temporarily affect the market price of the security or the execution of the transaction, or both, to the possible detriment of a portfolio or the other account(s) involved. Additionally, the management of multiple portfolios and/or other accounts may result in a portfolio manager devoting unequal time and attention to the management of each portfolio and/or other account. The Subadviser’s team approach to portfolio management and block trading approach seeks to limit this potential risk.

The Subadviser also maintains a gift and entertainment policy to address the potential for a business contact to give gifts or host entertainment events that may influence the business judgment of an employee.

Employees are permitted to retain gifts of only a nominal value and are required to make reimbursement for entertainment events above a certain value. All gifts (except those of a de minimis value) and entertainment events that are given or sponsored by a business contact are required to be reported in a gift and entertainment log which is reviewed on a regular basis for possible issues.

Employees of the Subadviser have access to transactions and holdings information regarding client accounts and the Subadviser’s overall trading activities. This information represents a potential conflict of interest because employees may take advantage of this information as they trade in their personal accounts. Accordingly, the Subadviser maintains a Code of Ethics that is compliant with Rule 17j-1 under the 1940 Act and Rule 204A-1 under the Advisers Act to address personal trading. In addition, the Code of Ethics seeks to establish broader principles of good conduct and fiduciary responsibility in all aspects of the Subadviser’s business. The Code of Ethics is administered by the Legal and Compliance Department and monitored through the Subadviser’s compliance monitoring program.

The Subadviser may also face other potential conflicts of interest with respect to managing client assets, and the description above is not a complete description of every conflict of interest that could be deemed to exist. The Subadviser also maintains a compliance monitoring program and engages independent auditors to conduct a SOC1/ISAE 3402 audit on an annual basis. These steps help to ensure that potential conflicts of interest have been addressed.

With respect to the compensation of the Fund’s investment professionals, the Subadviser’s compensation system assigns each employee a total compensation range, which is derived from annual market surveys that benchmark each role with its job function and peer universe. This method is designed to reward employees with total compensation reflective of the external market value of their skills, experience and ability to produce desired results. Standard compensation includes competitive base salaries, generous employee benefits and a retirement plan.

In addition, the Subadviser’s employees are eligible for bonuses. These are structured to closely align the interests of employees with those of the Subadviser, and are determined by the professional’s job function and pre-tax performance as measured by a formal review process. All bonuses are completely discretionary. The principal factor considered is an investment professional’s investment performance versus appropriate peer groups and benchmarks (e.g., a securities index and with respect to the Fund, the benchmark set forth in the Fund’s Prospectus to which the Fund’s average annual total returns are compared or, if none, the benchmark set forth in the Fund’s annual report). Performance is reviewed on a 1, 3 and 5 year basis for compensation—with 3 and 5 years having a larger emphasis. The Subadviser may also measure an investment professional’s pre-tax investment performance against other benchmarks, as it determines appropriate. Because investment professionals are generally responsible for multiple accounts (including the Fund) with similar investment strategies, they are generally compensated on the performance of the aggregate group of similar accounts, rather than a specific account. Other factors that may be considered when making bonus decisions include client service, business development, length of service to the Subadviser, management or supervisory responsibilities, contributions to developing business strategy and overall contributions to the Subadviser’s business.

Finally, in order to attract and retain top talent, all investment professionals are eligible for additional incentives in recognition of outstanding performance. These are determined based upon the factors described above and include long-term incentives that vest over a set period of time past the award date.

The table below identifies the dollar range of securities beneficially owned by the named investment professional as of June 30, 2024.

Dollar Range ownership is as follows:
A: none
B: $1 - $10,000
C: 10,001 - $50,000
D: $50,001 - $100,000
E: $100,001 - $500,000
F: $500,001 - $1 million
G: over $1 million

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this Report to be signed on its behalf by the undersigned, there unto duly authorized.

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

NAME AND		LENGTH OF		PRINCIPAL OCCUPATION(S) DURING
ADDRESS		TIME SERVED		PAST 5 YEARS

Name of PM	Type of Account	Number of Accounts Managed	Total Assets Managed	Number of Accounts Managed for which Advisory Fee is Performance-Based	Assets Managed for which Advisory Fee is Performance-Based
Michael C. Buchanan ‡	Other Registered Investment Companies	75	$113.14 billion	None	None
	Other Pooled Vehicles	286	$66.02 billion	22	$2.56 billion
	Other Accounts	570	$173.63 billion	20	$11.17 billion

Simon Miller ‡	Other Registered Investment Companies	1	$109 million	None	None
	Other Pooled Vehicles	12	$1.83 billion	2	$176 million
	Other Accounts	1	$250 million	None	None

Investment Professional		Dollar Range of Portfolio Securities Beneficially Owned
Michael C. Buchanan		A
Simon Miller		A

	(a) (1) Not applicable.
	Exhibit 99.CODE ETH

	(a) (2) Certifications pursuant to section 302 of the Sarbanes-Oxley Act of 2002 attached hereto.
	Exhibit 99.CERT

	(b) Certifications pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 attached hereto.
	Exhibit 99.906CERT

By:	/s/ Jane Trust
	Jane Trust
	Chief Executive Officer

Date:	August 26, 2024

By:	/s/ Christopher Berarducci
	Christopher Berarducci
	Principal Financial Officer

Date:	August 26, 2024