Mainstay Raised $18 Million and Acquired Truelist

The real estate platform secured new funding to support its expansion into brokerage services.

Updated on Sept. 28, 2026 in Commercial

Isometric editorial illustration of a brass house key placed next to a simplified wooden house frame, symbolizing real estate consolidation. — Real estate platform Mainstay has raised $18 million in new financing and completed the acquisition of listing platform Truelist to scale its brokerage services. AI Illustration. Upload story photo >

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Mainstay has secured $18 million in financing and completed the acquisition of the AI-powered listing platform Truelist. The deal aims to streamline property listing management and expand operations into brokerage for smaller investors.

Why it matters

By integrating the Truelist platform, Mainstay intends to consolidate its technological efforts and scale its reach within the residential real estate market. This capital infusion will specifically support the company's growth strategy for servicing smaller-scale market participants.

Mainstay has facilitated over $12 billion in residential real estate transactions and executed more than 2 million agentic workflows to date. The startup was established as an independent entity in August 2024.

The players

Mainstay

A San Francisco-based real estate technology company that leverages proprietary data and automation.

Truelist

A Seattle-based company that developed an AI-powered platform for the creation and distribution of property listings.

Carey Armstrong

The founder of Truelist who is joining Mainstay as the new chief strategy officer.

The details

Mainstay will utilize the new funding to accelerate its move into brokerage services while merging the Truelist platform, which manages property listings across Multiple Listing Service systems. Truelist founder Carey Armstrong will join the company as chief strategy officer to oversee the transition.

August 2024: Mainstay launched as an independent company.
2024: Truelist was founded.
September 28, 2026: Mainstay announced the funding and acquisition.

Culture Shift

This acquisition mirrors the broader industry trend of consolidating specialized AI tools into comprehensive real estate management platforms to optimize agent productivity. It reflects a shift toward unified software ecosystems as the primary driver for modern real estate brokerage expansion.

Smaller residential investors may see increased access to brokerage services and improved property listing management tools as Mainstay expands. These changes aim to simplify the digital workflow for listing and transaction management across the country.

The takeaway

The integration of AI-powered listing tools into larger brokerage platforms is becoming a standard strategy for scaling real estate operations. Investors and agents should expect more unified digital tools as companies seek to eliminate redundant listing management systems.