(Mark One) ☒QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the quarterly period ended June 30, 2026Or☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period fromtoCommission file number: 001-34416 PennyMac Mortgage Investment Trust(Exact name of registrant as specified in its charter) Maryland(State or other jurisdiction ofincorporation or organization) Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities ExchangeAct of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has beensubject to such filing requirements for the past 90 days.Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant toRule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was requiredto submit such files).Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reportingcompany or an emerging growth company. See the definitions of “large accelerated filer”, “accelerated filer”, “smaller reporting company” and“emerging growth company” in Rule 12b-2 of the Exchange Act. Accelerated filerSmaller reporting companyEmerging growth company If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complyingwith any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act):Yes☐No☒ Indicate the number of shares outstanding of each of the registrant’s classes of common stock, as of the latest practicable date. Outstanding at July 31, 202687,202,362 PENNYMAC MORTGAGE INVESTMENT TRUSTFORM 10-QJune 30, 2026TABLE OF CONTENTS PageSpecial Note Regarding Forward-Looking Statements1PART I. FINANCIAL INFORMATION3Item 1.Financial Statements (Unaudited)3Consolidated Balance Sheets3Consolidated Statements of Operations5Consolidated Statements of Changes in Shareholders’ Equity6Consolidated Statements of Cash Flows8Notes to Consolidated Financial Statements10Item 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations57Our Company57Results of Operations61Net Investment Income62Expenses71Balance Sheet Analysis73Asset Acquisitions73Investment Portfolio Composition74Cash Flows76Liquidity and Capital Resources77Off-Balance Sheet Arrangements and Aggregate Contractual Obligations82Item 3.Quantitative and Qualitative Disclosures About Market Risk82Item 4.Controls and Procedures83PART II. OTHER INFORMATION84Item 1.Legal Proceedings84Item 1ARisk Factors84Item 2.Unregistered Sales of Equity Securities and Use of Proceeds84Item 3.Defaults Upon Senior Securities84Item 4.Mine Safety Disclosures84Item 5.Other Information84Item 6.Exhibits85 SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS This Quarterly Report on Form 10-Q (this “Report”) contains certain forward-looking statements that are subject to variousrisks and uncertainties. Forward-looking statements are generally identifiable by use of forward-looking terminology such as“may,” “will,” “should,” “potential,” “intend,” “expect,” “seek,” “anticipate,” “estimate,” “approximately,” “believe,” “could,”“project,” “predict,” “continue,” “plan” or other similar words or expressions. Forward-looking statements are based on certain assumptions, discuss future expectations, describe future plans andstrategies, contain financial and operating projections or state other forward-looking information. Examples of forward-lookingstatements include the following: •projections of our revenues, results of operations, earnings per share, capital structure or other financial items;•descriptions of our plans or objectives for future operations, products or services;•forecasts of our future economic performance, interest rates, profit margins and our share of future markets; and•descriptions of assumptions underlying or relating to any of the foregoing expectations regarding the timing of generatingany revenues. Our ability to predict results or the actual effect of future events, actions, plans or strategies is inherently uncertain. Althoughwe believe that the expectations reflected in such forward-looking statements are based on reasonable assumptions, our actualresults and performance could differ materially from those set forth in the forward-looking statements. There are a number offactors, many of which are beyond our control that could cause actual results to differ significantly from management