Exhibit 99.1

PennyMac Mortgage Investment Trust Reports

Second Quarter 2021 Results

Westlake Village, CA, August 5, 2021 – PennyMac Mortgage Investment Trust (NYSE: PMT) today reported net income attributable to common shareholders of $31.9 million, or $0.32 per common share on a diluted basis for the second quarter of 2021, on net investment income of $121.6 million. PMT previously announced a cash dividend for the second quarter of 2021 of $0.47 per common share of beneficial interest, which was declared on June 23, 2021 and paid on July 29, 2021 to common shareholders of record as of July 15, 2021.

Second Quarter 2021 Highlights

Financial results:

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Other investment and financing highlights:

“PMT continues to take advantage of its position as the largest correspondent aggregator in the U.S. and its synergistic relationship with PFSI,” said Chairman and CEO David Spector. “The infrastructure we have in place for PMT to source investments organically has proven to be a unique competitive advantage unmatched in the industry. PMT demonstrated this by successfully completing its first purchase of subordinate bonds related to a private label securitization of non-owner occupied loans acquired in PMT’s correspondent production business. Additionally, we believe these new investments offer compelling, long-term returns, and benefit from PFSI’s industry-leading fulfillment process and position as the servicer of the underlying loans. While the recent decline in interest rates combined with FHFA’s elimination of the Adverse Market Refinance Fee is expected to have a mark-to-market impact on PMT’s MSR value, these factors have meaningfully increased the population of loans that would benefit from a refinance. The continuation of this vibrant origination market combined with PMT’s high-quality interest rate sensitive and credit investments support PMT’s ability to continue delivering strong risk-adjusted returns to its shareholders.”

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The following table presents the contributions of PMT’s segments, consisting of Credit Sensitive Strategies, Interest Rate Sensitive Strategies, Correspondent Production, and Corporate:

Credit Sensitive Strategies Segment

The Credit Sensitive Strategies segment primarily includes results from CRT, and also includes distressed loans and non-Agency subordinated bonds. Pretax income for the segment was $78.5 million on revenues of $82.7 million, compared to pretax income of $134.3 million on revenues of $138.5 million in the prior quarter.

Net gain on investments in the segment was $98.4 million, down from $154.3 million in the prior quarter.

Net gain on CRT investments for the quarter was $98.0 million, down from $154.0 million in the prior quarter, and included $38.7 million in valuation-related gains which reflects the impact of credit spread tightening and elevated prepayment speeds. The prior quarter included $98.1 million in such gains. Net gain on CRT investments also included $39.1 million in realized gains and carry, compared to a gain of $42.7 million in the prior quarter. Recoveries net of realized losses during the quarter were $20.2 million, primarily related to L Street Securities 2017-PM1, as losses were reversed for loans that had been in forbearance and reperformed.

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Net interest expense for the segment totaled $15.8 million, compared to $16.6 million in the prior quarter. Interest income totaled $0.4 million, down from $0.7 million in the prior quarter. Interest expense totaled $16.2 million, down from $17.3 million in the prior quarter due to decreased financing expenses as a result of smaller CRT balances due to prepayments.

Segment expenses were $4.1 million, down from $4.3 million in the prior quarter due to lower expenses related to assisting certain borrowers in mitigating loan delinquencies they incurred as a result of dislocations arising from the COVID-19 pandemic.

Interest Rate Sensitive Strategies Segment

The Interest Rate Sensitive Strategies segment includes results from investments in MSRs, Agency MBS, non-Agency senior MBS and interest rate hedges. Pretax loss for the segment was $65.4 million on investment losses of $44.0 million, compared to a pretax loss of $64.6 million on net investment losses of $44.8 million in the prior quarter. The segment includes investments that typically have offsetting fair value exposures to changes in interest rates. For example, in a period with decreasing interest rates, MSRs typically decrease in fair value whereas Agency MBS typically increase in fair value.

The results in the Interest Rate Sensitive Strategies segment consist of net gains and losses on investments, net interest income and net loan servicing fees, as well as associated expenses.

Net gain on investments for the segment was $30.0 million, and consisted of $29.3 million of gains on MBS, $0.9 million of gains on loans held by variable interest entities net of asset-backed secured financing, and $0.2 million of losses on hedging derivatives.

Net loan servicing fees were a loss of $44.9 million, compared to net loan servicing fee income of $50.0 million in the prior quarter. Net loan servicing fees included servicing fees of $124.0 million, up from the prior quarter primarily driven by a larger portfolio, and $24.9 million in other fees, reduced by $69.6 million in realization of MSR cash flows, which was up 17 percent from the prior quarter. Net loan servicing fees also included $229.9 million in fair value losses of MSRs, $94.1 million in related hedging gains, and $11.5 million of MSR recapture income. PMT’s hedging activities are intended to manage the Company’s net exposure across all interest rate sensitive strategies, which include MSRs and MBS.

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The following schedule details net loan servicing fees:

MSR fair value losses resulted primarily from increased expectations for prepayment activity in the future due to lower mortgage rates and a flatter yield curve, while Agency MBS and interest rate hedges increased in fair value. PMT benefited from recapture income from PFSI for elevated prepayment activity during the quarter. PMT generally benefits from recapture income when the prepayment of a loan underlying PMT’s MSR results from refinancing by PFSI.

Net interest expense for the segment was $29.1 million, up from $23.8 million in the prior quarter. Interest income totaled $10.1 million, down from $13.5 million in the prior quarter, due primarily to lower earnings rates on custodial balances. Interest expense totaled $39.1 million, up slightly from the prior quarter.

Segment expenses were $21.4 million, up from $19.8 million in the prior quarter.

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Correspondent Production Segment

PMT acquires newly originated loans from correspondent sellers and typically sells or securitizes the loans, resulting in current-period income and additions to its investments in MSRs related to a portion of its production. PMT’s Correspondent Production segment generated pretax income of $19.0 million, down from $35.6 million in the prior quarter.

Through its correspondent production activities, PMT acquired $46.7 billion in UPB of loans, down 9 percent from the prior quarter and up 56 percent from the second quarter of 2020. Of total correspondent acquisitions, conventional conforming acquisitions totaled $30.5 billion, and government-insured or guaranteed acquisitions totaled $16.2 billion, down from $33.8 billion and $17.4 billion, respectively, in the prior quarter. Interest rate lock commitments on conventional loans totaled $30.3 billion, down from $34.0 billion in the prior quarter.

Segment revenues were $82.2 million, a 23 percent decrease from the prior quarter and included net gain on loans acquired for sale of $27.7 million, other income of $45.8 million, which primarily consists of volume-based origination fees, and net interest income of $8.6 million. Net gain on loans acquired for sale in the quarter decreased by $25.3 million from the prior quarter as a result of lower volumes and margins as industry volumes declined. Interest income was $32.5 million, up from $22.8 million in the prior quarter due to higher average rates on newly originated loans, and interest expense was $23.9 million, up slightly from the prior quarter.

Segment expenses were $63.2 million, down from $71.5 million in the prior quarter driven by the decrease in acquisition volumes. The weighted average fulfillment fee rate in the second quarter was 18 basis points, unchanged from the prior quarter.

Corporate Segment

The Corporate segment includes interest income from cash and short-term investments, management fees, and corporate expenses.

Segment revenues were $0.7 million, up slightly from $0.6 million in the prior quarter. Management fees were $11.9 million, up 41 percent from the prior quarter as a result of incentive fees paid to PFSI based on PMT’s profitability. Other segment expenses were $7.1 million, up from $6.4 million in the prior quarter.

Taxes

PMT recorded a tax benefit of $24.3 million driven by fair value declines in MSRs held in PMT’s taxable subsidiary.

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Management’s slide presentation will be available in the Investor Relations section of the Company’s website at www.pennymac-REIT.com beginning at 1:30 p.m. (Pacific Time) on Thursday, August 5, 2021.

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About PennyMac Mortgage Investment Trust

PennyMac Mortgage Investment Trust is a mortgage real estate investment trust (REIT) that invests primarily in residential mortgage loans and mortgage-related assets. PMT is externally managed by PNMAC Capital Management, LLC, a wholly-owned subsidiary of PennyMac Financial Services, Inc. (NYSE: PFSI). Additional information about PennyMac Mortgage Investment Trust is available at www.PennyMac-REIT.com

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, regarding management’s beliefs, estimates, projections and assumptions with respect to, among other things, the Company’s financial results, future operations, business plans and investment strategies, as well as industry and market conditions, all of which are subject to change. Words like “believe,” “expect,” “anticipate,” “promise,” “plan,” and other expressions or words of similar meanings, as well as future or conditional verbs such as “will,” “would,” “should,” “could,” or “may” are generally intended to identify forward-looking statements. Actual results and operations for any future period may vary materially from those projected herein and from past results discussed herein. Factors which could cause actual results to differ materially from historical results or those anticipated include, but are not limited to: our exposure to risks of loss and disruptions in operations resulting from adverse weather conditions, man-made or natural disasters, climate change and pandemics such as COVID-19; the impact to our CRT agreements of increased borrower requests for forbearance under the CARES Act; changes in the Company’s investment objectives or investment or operational strategies, including any new lines of business or new products and services that may subject it to additional risks; volatility in the Company’s industry, the debt or equity markets, the general economy or the real estate finance and real estate markets specifically, whether the result of market events or otherwise; events or circumstances which undermine confidence in the financial and housing markets or otherwise have a broad impact on financial and housing markets, such as the sudden instability or collapse of large depository institutions or other significant corporations, terrorist attacks, natural or manmade disasters, or threatened or actual armed conflicts; elimination of the FHFA’s adverse market refinance fee; changes in general business, economic, market, employment and domestic and international political conditions, or in consumer confidence and spending habits from those expected; declines in real estate or significant changes in U.S. housing prices or activity in the U.S. housing market; the availability of, and level of competition for, attractive risk-adjusted investment opportunities in mortgage loans and mortgage-related assets that satisfy the Company’s investment objectives; the inherent difficulty in winning bids to acquire mortgage loans, and the Company’s success in doing so; the concentration of credit risks to which the Company is exposed; the degree and nature of the Company’s competition; the Company’s dependence on its manager and servicer, potential conflicts of interest with such entities and their affiliates, and the performance of such entities; changes in personnel and lack of availability of qualified personnel at its manager, servicer or their affiliates; the availability, terms and deployment of short-term and long-term capital; the adequacy of the Company’s cash reserves and working capital; the Company’s ability to maintain the desired relationship between its financing and the interest rates and maturities of its assets; the timing and amount of cash flows, if any, from the Company’s investments; unanticipated increases or volatility in financing and other costs, including changes in interest rates; our substantial amount of indebtedness; the performance, financial condition and liquidity of borrowers; the ability of the Company’s servicer, which also provides the Company with fulfillment services, to approve and monitor correspondent sellers and underwrite loans to investor standards; incomplete or inaccurate information or documentation provided by customers or counterparties, or adverse changes in the financial condition of the Company’s customers and counterparties; the Company’s indemnification and repurchase obligations in connection with mortgage loans it purchases and later sells or securitizes; the quality and enforceability of the collateral documentation evidencing the Company’s ownership and rights in the assets in which it invests; increased rates of delinquency, default and/or decreased recovery rates on the Company’s investments; the performance of mortgage loans underlying mortgage backed securities in which the Company retains credit risk; the Company’s ability to foreclose on its investments in a timely manner or at all; increased prepayments of the mortgages and other loans underlying the Company’s mortgage-backed securities or relating to the Company’s mortgage servicing rights and other investments; the degree to which the Company’s hedging strategies may or may not protect it from interest rate volatility; the effect of the accuracy of or changes in the estimates the Company makes about uncertainties, contingencies and asset and liability valuations when measuring and reporting upon the Company’s financial condition and results of operations; the Company’s ability to maintain appropriate internal control over financial reporting; technologies for loans and the Company’s ability to mitigate security risks and cyber intrusions; the Company’s ability to obtain and/or maintain licenses and other approvals in those jurisdictions where required to conduct its business; the Company’s ability to detect misconduct and fraud; the Company’s ability to comply with various federal, state and local laws and regulations that govern its business; developments in the secondary markets for the Company’s mortgage loan products; legislative and regulatory changes that impact the mortgage loan industry or housing market; changes in regulations or the occurrence of other events that impact the business, operations or prospects of government agencies such as the Government National Mortgage Association, the Federal Housing Administration or the Veterans Administration, the U.S.

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Department of Agriculture, or government-sponsored entities such as the Federal National Mortgage Association or the Federal Home Loan Mortgage Corporation, or such changes that increase the cost of doing business with such entities; the Dodd-Frank Wall Street Reform and Consumer Protection Act and its implementing regulations and regulatory agencies, and any other legislative and regulatory changes that impact the business, operations or governance of mortgage lenders and/or publicly traded companies; the Consumer Financial Protection Bureau and its issued and future rules and the enforcement thereof; changes in government support of homeownership; changes in government or government-sponsored home affordability programs; limitations imposed on the Company’s business and its ability to satisfy complex rules for it to qualify as a REIT for U.S. federal income tax purposes and qualify for an exclusion from the Investment Company Act of 1940 and the ability of certain of the Company’s subsidiaries to qualify as REITs or as taxable REIT subsidiaries for U.S. federal income tax purposes, as applicable, and the Company’s ability and the ability of its subsidiaries to operate effectively within the limitations imposed by these rules; changes in governmental regulations, accounting treatment, tax rates and similar matters (including changes to laws governing the taxation of REITs, or the exclusions from registration as an investment company); the Company’s ability to make distributions to its shareholders in the future; the Company’s failure to deal appropriately with issues that may give rise to reputational risk; and the Company’s organizational structure and certain requirements in its charter documents. You should not place undue reliance on any forward-looking statement and should consider all of the uncertainties and risks described above, as well as those more fully discussed in reports and other documents filed by the Company with the Securities and Exchange Commission from time to time. The Company undertakes no obligation to publicly update or revise any forward-looking statements or any other information contained herein, and the statements made in this press release are current as of the date of this release only.

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PENNYMAC MORTGAGE INVESTMENT TRUST AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

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PENNYMAC MORTGAGE INVESTMENT TRUST AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

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