AG Mortgage Investment Trust, Inc. is a residential mortgage real estate investment trust that invests in a diversified, risk-adjusted portfolio of residential mortgage-related assets in the United States mortgage market; its core investments include residential whole loans such as newly originated non-agency loans, agency-eligible loans, and home equity loans, which it acquires, securitizes, and holds, alongside agency residential mortgage-backed securities (RMBS) guaranteed by government-sponsored enterprises; the portfolio also encompasses legacy commercial investments, including commercial mortgage-backed securities (CMBS) and commercial real estate loans acquired through prior transactions, as well as other residential mortgage assets obtained primarily through its equity-method investee Arc Home LLC, a residential mortgage loan originator, and third-party partners. The company, founded in 2011 and headquartered at 245 Park Avenue in New York, New York, operates nationwide across the U.S. housing market, targeting non-agency and agency-eligible residential mortgage segments for non-bank lenders, investors, and securitization counterparties; it is externally managed by AG REIT Management, LLC, a subsidiary of TPG Angelo Gordon. Among its latest major developments, the company completed the acquisition of Western Asset Mortgage Capital Corporation in 2024, integrating complementary commercial real estate loan and CMBS holdings to expand portfolio diversification; in August 2025, it increased its indirect ownership in Arc Home LLC (through AG Arc LLC) to 66% from 44.6% by issuing restricted common shares valued at $15.9 million, enhancing access to high-quality collateral and boosting earnings available for distribution through improved gain-on-sale margins and non-agency origination volumes; further, it sponsored multiple home equity and closed-end second lien securitizations totaling over $1.6 billion in unpaid principal balance during 2025, including partnerships with leading non-bank originators, refinanced high-cost debt from legacy assets to improve net interest margins, and grew its $8.8 billion investment portfolio amid active loan purchases exceeding $500 million in agency-eligible and home equity categories.