Organization	3 Months Ended
Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Note 1—Organization PennyMac Mortgage Investment Trust (“PMT” or the “Company”) is a specialty finance company, which invests in residential mortgage-related assets. The Company operates in three reportable segments: credit sensitive strategies, interest rate sensitive strategies and aggregation and securitization (formerly referred to as correspondent production). All other activities are included in corporate: • The credit sensitive strategies segment represents the Company’s investments in credit risk transfer (“CRT”) arrangements referencing loans from its own aggregation and securitization (“CRT arrangements”) and subordinate, residential and credit-linked mortgage-backed securities (“MBS”). • The interest rate sensitive strategies segment represents the Company’s investments in mortgage servicing rights (“MSRs”), Agency and senior non-Agency MBS, and collateralized mortgage obligations ("CMOs") and the related interest rate hedging activities. • The aggregation and securitization segment represents the Company’s operations purchasing, pooling and reselling or financing newly originated prime credit quality loans either directly or in the form of MBS, using the services of Pennymac Capital Management, LLC (“PCM”) and PennyMac Loan Services, LLC (“PLS”), both wholly-owned subsidiaries of PennyMac Financial Services, Inc. (“PFSI”), a publicly-traded mortgage banking and investment management company separately listed on the New York Stock Exchange. The Company sells the loans it acquires through its aggregation and securitization activities primarily to government-sponsored enterprises ("GSEs") such as the Federal Home Loan Mortgage Corporation (“Freddie Mac”) and the Federal National Mortgage Association (“Fannie Mae”). Freddie Mac and Fannie Mae are each referred to as an “Agency” and, collectively, as the “Agencies.” The Company also finances certain of the loans it aggregates through its own securitizations and retains certain senior and subordinate MBS created in the securitizations. • Corporate activities include management fees, corporate expense amounts and certain interest income and expense. None of the corporate activities qualify as reportable segments. The Company conducts substantially all of its operations and makes substantially all of its investments through its subsidiary, PennyMac Operating Partnership, L.P. (the “Operating Partnership”), and the Operating Partnership’s subsidiaries. A wholly-owned subsidiary of the Company is the sole general partner, and the Company is the sole limited partner, of the Operating Partnership. The Company believes that it qualifies, and has elected to be taxed, as a real estate investment trust (“REIT”) under the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”). To maintain its tax status as a REIT, the Company is required to distribute at least 90% of its taxable income in the form of qualifying distributions to shareholders.

PennyMac Mortgage Investment Trust (“PMT” or the “Company”) is a specialty finance company, which invests in residential mortgage-related assets. The Company operates in three reportable segments: credit sensitive strategies, interest rate sensitive strategies and aggregation and securitization (formerly referred to as correspondent production). All other activities are included in corporate:

•

The credit sensitive strategies segment represents the Company’s investments in credit risk transfer (“CRT”) arrangements referencing loans from its own aggregation and securitization (“CRT arrangements”) and subordinate, residential and credit-linked mortgage-backed securities (“MBS”).

•

The interest rate sensitive strategies segment represents the Company’s investments in mortgage servicing rights (“MSRs”), Agency and senior non-Agency MBS, and collateralized mortgage obligations ("CMOs") and the related interest rate hedging activities.

•

The aggregation and securitization segment represents the Company’s operations purchasing, pooling and reselling or financing newly originated prime credit quality loans either directly or in the form of MBS, using the services of Pennymac Capital Management, LLC (“PCM”) and PennyMac Loan Services, LLC (“PLS”), both wholly-owned subsidiaries of PennyMac Financial Services, Inc. (“PFSI”), a publicly-traded mortgage banking and investment management company separately listed on the New York Stock Exchange.

The Company sells the loans it acquires through its aggregation and securitization activities primarily to government-sponsored enterprises ("GSEs") such as the Federal Home Loan Mortgage Corporation (“Freddie Mac”) and the Federal National Mortgage Association (“Fannie Mae”). Freddie Mac and Fannie Mae are each referred to as an “Agency” and, collectively, as the “Agencies.” The Company also finances certain of the loans it aggregates through its own securitizations and retains certain senior and subordinate MBS created in the securitizations.

•

Corporate activities include management fees, corporate expense amounts and certain interest income and expense. None of the corporate activities qualify as reportable segments.

The Company conducts substantially all of its operations and makes substantially all of its investments through its subsidiary, PennyMac Operating Partnership, L.P. (the “Operating Partnership”), and the Operating Partnership’s subsidiaries. A wholly-owned subsidiary of the Company is the sole general partner, and the Company is the sole limited partner, of the Operating Partnership.

The Company believes that it qualifies, and has elected to be taxed, as a real estate investment trust (“REIT”) under the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”). To maintain its tax status as a REIT, the Company is required to distribute at least 90% of its taxable income in the form of qualifying distributions to shareholders.