TPG Mortgage Investment Trust Inc is a residential mortgage real estate investment trust focused on investing in a diversified risk-adjusted portfolio of residential mortgage-related assets in the U. S. mortgage market. The company's primary objective is to provide attractive risk-adjusted returns to stockholders over the long term through dividends and capital appreciation. TPG Mortgage Investment Trust Inc concentrates its investment activities on acquiring and securitizing newly originated residential mortgage loans within the non-agency segment of the housing market. It obtains assets through Arc Home LLC, its residential mortgage loan originator in which it holds an approximate 66.0% interest, and through other third-party origination partners. The company finances acquired loans through various short-term financing lines and utilizes TPG Inc's proprietary securitization platform to secure long-term non-recourse non-mark-to-market financing when market conditions permit. Through its ownership in Arc Home, the company also has exposure to mortgage banking activities, as Arc Home is a multi-channel licensed mortgage originator and servicer primarily engaged in originating and selling residential mortgage loans while retaining mortgage servicing rights on certain loans it originates.

TPG Mortgage Investment Trust Inc generates revenue primarily through net interest income from its investment portfolio, changes in the fair value of its investments or hedge portfolio, and income from its investment in Arc Home. Net interest income consists of the interest earned on investments less the interest expense incurred on borrowed funds, inclusive of the cost or benefit of hedging. Income from the investment in Arc Home is generated through its mortgage banking activities, which include the origination and subsequent sale of residential mortgage loans and servicing income sourced from mortgage servicing rights. The company's investment portfolio, excluding its ownership in Arc Home, primarily includes Residential Investments and Agency RMBS. As of December 31, 2025, the Residential Investments consisted of Non-Agency Loans, Agency-Eligible Loans, Home Equity Loans, and Non-Agency RMBS collateralized by these loan types. The company may also invest in other types of residential mortgage loans and other mortgage-related assets. Additionally, the investment portfolio includes commercial loans and commercial-mortgage backed securities acquired in the WMC acquisition, referred to as Legacy WMC Commercial Investments, which the company expects to hold until maturity or exit opportunistically.

The company operates through the following segments: Residential Investments and Agency RMBS.

• Residential Investments includes Non-Agency Loans, which are loans that do not conform to the underwriting guidelines of a government-sponsored enterprise and consist of Qualified mortgage loans and Non-Qualified mortgage loans collateralized by a first lien mortgaged property. It also includes Agency-Eligible Loans, which are loans collateralized by a first lien mortgaged property and primarily secured by investment properties, underwritten in accordance with GSE guidelines but not guaranteed by a GSE. Home Equity Loans consist of revolving lines of credit and closed-end loans secured primarily by second liens on residential mortgaged properties, providing borrowers with access to home equity without requiring the payoff of an existing mortgage. Non-Agency RMBS represent fixed- and floating-rate residential mortgage-backed securities issued by entities other than U. S. government-sponsored enterprises or agencies of the U. S. government, primarily secured by Non-QM, Agency-Eligible, Home Equity, and Prime Jumbo Loans.

• Agency RMBS represent interests in pools of residential mortgage loans guaranteed by a government-sponsored enterprise such as Fannie Mae or Freddie Mac, or an agency of the U. S. Government such as Ginnie Mae.

TPG Mortgage Investment Trust Inc operates in the competitive residential mortgage REIT sector, where it faces competition from other mortgage REITs, specialty finance companies, banks, mortgage bankers, insurance companies, mutual funds, institutional investors, investment banking firms, financial institutions, governmental bodies, hedge funds, and other entities. Many competitors are significantly larger with greater access to capital and resources. The company believes it has a competitive advantage through access to its Manager’s professionals and their industry expertise, which helps assess investment risks and determine appropriate pricing for potential investments. These relationships enable the company to compete more effectively for attractive investment opportunities in the non-agency residential mortgage loan market. The company’s strategy relies on the experience of its Manager’s personnel to direct investments based on a rigorous and disciplined approach to credit analysis, focusing on fundamental in-depth research and evaluating factors such as expected risk-adjusted returns, yields, relative value, credit fundamentals, vintage of collateral, prepayment speeds, supply and demand trends, and macroeconomic conditions.

TPG Mortgage Investment Trust Inc serves a diverse customer base within the residential mortgage market, including borrowers seeking residential mortgage loans, investors purchasing mortgage-backed securities, and counterparties engaged in financing arrangements such as repurchase agreements. The company's activities involve interactions with homeowners, real estate investors, financial institutions, and securitization investors. Through its ownership in Arc Home, the company originates and sells residential mortgage loans to various buyers in the secondary market while retaining servicing rights on certain loans, generating income from mortgage servicing activities. The company does not disclose specific customer names in the filing, but its customer base comprises individuals and institutions involved in the origination, financing, and investment in residential mortgage assets across the United States.