Mainstay Raised $18 Million to Acquire Listing Platform

The residential real estate firm will use the new capital to expand its brokerage operations and serve smaller investors.

Updated on Sept. 28, 2026 in Commercial

Bold flat-color editorial illustration of house keys and a geometric model of a house, representing real estate market consolidation. — Mainstay has acquired residential listing platform Truelist as part of an $18 million capital expansion to scale brokerage operations for smaller investors. AI Illustration. Upload story photo >

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Mainstay has secured $18 million in new financing and finalized the acquisition of Truelist, an AI-powered platform for property listings. The move aims to streamline operations by merging the capabilities of the two companies.

Why it matters

By integrating Truelist, Mainstay plans to scale its brokerage services and provide more robust tools for smaller real estate investors. The combined platform intends to eliminate redundant work between the two formerly separate listing systems.

Mainstay raised $18 million to support its growth, having already facilitated over $12 billion in residential real estate transactions to date. The company has also completed more than 2 million agentic workflows since launching as an independent entity.

The players

Mainstay

A real estate company that uses automated workflows and proprietary pricing intelligence to facilitate residential transactions.

Truelist

A startup providing an AI-powered platform for the creation and distribution of real estate property listings.

Carey Armstrong

The founder of Truelist who is joining Mainstay as the company's chief strategy officer.

The details

Mainstay combines proprietary pricing data and automated agentic workflows to assist in residential transactions. By acquiring Truelist, which was founded in 2024 to manage and distribute property listings across Multiple Listing Service systems, Mainstay plans to unify its infrastructure. This consolidation is designed to reduce duplicated efforts and expand access for smaller market participants.

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

Money Landscape

This acquisition follows the ongoing industry trend of consolidating AI-powered listing technologies to gain efficiencies in real estate brokerage. The move signals a broader shift toward integrating automated workflow systems into the established property transaction lifecycle.

Investors who use brokerage services may see improved data integration and more efficient listing tools as the platforms unify their technology stacks. Homebuyers and investors should consult with a qualified professional to understand how new brokerage service offerings may impact their specific property search or investment strategy.

The takeaway

Mainstay is scaling its brokerage capabilities by merging its existing transaction tools with the listing automation technology developed by Truelist. Real estate investors should monitor how this market consolidation changes the availability of data-backed property insights in the coming months.