Mainstay
PrivateLast Round
Seed
Sep 16, 2026
Total Funding Raised
$62M
Momentum
Top 1%
of companies Caplight tracks
Company Overview
Mainstay operates in Enterprise Software and is based in San Francisco, California. Its latest recorded funding round was a Seed round in September 2026.
Mainstay is a real estate technology company that operates an AI-enabled market intelligence and transaction platform for the single-family rental industry.
Sector
Enterprise Software
Verticals
Business Intelligence, PropTech Services, Workflow Automation
Business Model
B2B
Customer Profile
Subscription SaaS, Data as a Service
AI Layer
Application
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Mainstay Comparables
Compare Mainstay with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| CB Insights | 81% | |
| AlphaSense | 72% | |
| Radix, Inc. | 52% |
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Mainstay Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Seed | Sep 16, 2026 | ||||
| Series A | Aug 1, 2024 |
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Key People
Founding team and executive leadership
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Mainstay Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Clocktower Ventures | Seed |
| Khosla Ventures | Seed, Series A |
| Stackpoint Ventures | Seed |
| FJ Labs | Seed |
| Alpaca | Seed |
| Inspired Capital | Series A |
| Parker89 | Seed |
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Market signals
Structured signals derived from secondary market and firmographic data.
- Sep 16, 2026
$18M raised with participation from Khosla Ventures.
- Aug 1, 2024
$25M round completed.
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Recent news
Latest coverage and updates
- hiresSep 18, 2026
Mainstay brings in Truelist founder and CEO Carey Armstrong as Chief Strategy Officer.
- acquiresSep 17, 2026
Mainstay acquires Truelist, LLC. as part of an $18M growth funding round to expand AI-powered tools across the residential property market, with the acquisition complete on Sep 18th '26.
- receives_financingSep 16, 2026
Mainstay raises more than $18 million in growth capital in California on Sep. 16th '26, with new investment from Parker89, Stackpoint, Alpaca VC, and FJ Labs alongside existing investors Khosla Ventures, Era Ventures, and Clocktower Technology Ventures, to expand into brokerages and smaller investor customers.
- acquiresSep 16, 2026
Mainstay acquires Seattle-based Truelist, Inc. as it raises $18M in financing in Sep '26, with Truelist, Inc.'s founder joining as chief strategy officer.
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Mainstay Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
Filing documents are not displayed on this public page. Request access to learn about available coverage.
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Frequently Asked Questions
Common questions about Mainstay's valuation, stock price, and market status.
Is Mainstay a public or private company?
Mainstay is a private company.
What is the current stock price of Mainstay?
Mainstay is a private company, so its shares have no public market price. Caplight tracks Mainstay's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Mainstay worth (valuation)?
Valuation information for Mainstay is not publicly available.
Can I buy Mainstay stock?
Mainstay shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Mainstay's last funding round?
Mainstay's most recent funding round was Seed on September 16, 2026.
Who are the main investors in Mainstay?
Key investors in Mainstay include Khosla Ventures.
Will Mainstay IPO soon?
No public IPO plans have been announced for Mainstay.
How can I track Mainstay secondary market activity?
Caplight tracks bids, offers, and trades in Mainstay's shares on secondary markets.