Key facts
- Mainstay’s last known valuation is $145.0M (Aug 2024).
- It has raised $44.0M; the latest was Early Stage VC in Dec 2025.
- Notable investors include FJ Labs, Khosla Ventures, Clocktower Ventures, Inspired Capital (New York), Era Ventures — 6 tracked in total.
- 1 investment vehicle was formed to buy Mainstay shares in the last 12 months, reporting $2.0M sold to 1 investors, per SEC Form D filings.
- Status: Privately Held (backing).
- ·The complete investor list — 6 names
- ·Watchlist + deal alerts for Mainstay
- ·The full record, as it builds
Funding rounds
No funding rounds for Mainstay are on record yet — either the company hasn't raised institutional capital, or the raise hasn't surfaced in our sources.
Secondary demand: investment vehicles
from SEC Form D filingsIn the last 12 months, 1 investment vehicle were formed to buy Mainstay shares, reporting $2.0M sold to 1 investors. Most recent filing Dec 2025. Vehicles like these are how secondary buyers pool demand for a name; a rising count is a demand signal.
About Mainstay
Operator of a comprehensive market intelligence and transaction platform intended to unlock single-family rental opportunities. The company's platform aggregates and standardizes data from various sources, providing actionable insights to all market participants, and offers purpose-built management, enabling business owners and operators to buy, manage, and sell homes.
- Sector
- Information Technology
- HQ
- Tempe, AZ, United States
- Founded
- 2024
- Employees
- 147
- Website
- mainstay.io/
- Ownership
- Privately Held (backing)
Mainstay doesn't have a composite mark yet — a PA Mark is published once enough pricing inputs exist (trade prints, fund marks, round prices). The rest of the record below builds toward it.
Recorded secondary trades
No secondary trades in Mainstay shares have been recorded yet. When a print lands — third-party, direct report, or platform — it appears here with structure, source, and price.
Institutional fund marks
No SEC-registered fund has reported a fair-value mark on Mainstay in its N-PORT filings yet. We sweep new filings monthly.