Mainstay Raises $18M Growth Capital

San Francisco-based real estate technology company Mainstay has raised $18 million in growth capital to fuel the expansion of its AI-powered intelligent system of record.

Investors

The funding round was backed by Khosla Ventures, Era Ventures, Parker89, Stackpoint, Alpaca VC, and FJ Labs.

Mainstay Use of Funds

Mainstay intends to use the capital to expand its core AI-powered transaction automation platform from large institutional investors into the residential property market, specifically targeting real estate brokerages, agents, and smaller property owners. The funding also supports the integration of Truelist assets to enhance data and listing management capabilities.

About Mainstay

Founded in 2024 and led by CEO Dod Fraser, a former president at Opendoor, Mainstay provides an intelligent system of record designed to automate data and transactions across the residential real estate lifecycle. The company currently serves a significant majority of the largest residential real estate investors in the United States.

Funding Details

Company Website: https://mainstay.io

Company: Mainstay
Raised: $18M
Round: Growth Capital
Funding Date: September 21, 2026
Additional Investors: Khosla Ventures, Era Ventures, Parker89, Stackpoint, Alpaca VC, FJ Labs
Software Category: Real Estate Tech
Source: https://www.geekwire.com/2026/ex-zillow-vps-startup-truelist-acquired-by-mainstay-in-18m-expansion-of-real-estate-ai/