Key facts
- Letter AI’s last known valuation is $305.5M (Feb 2026).
- It has raised $53.4M; the latest was Early Stage VC ($40.0M) in Feb 2026.
- Notable investors include Y Combinator, Pioneer Fund, Soma Capital, Battery Ventures, Lightbank (Venture Capital) — 10 tracked in total.
- 1 investment vehicle was formed to buy Letter AI shares in the last 12 months, reporting $3.3M sold to 13 investors, per SEC Form D filings.
- Status: Privately Held (backing).
- ·The complete investor list — 10 names
- ·Watchlist + deal alerts for Letter AI
- ·The full record, as it builds
Funding rounds
No funding rounds for Letter AI 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 Letter AI shares, reporting $3.3M sold to 13 investors. Most recent filing May 2026. Vehicles like these are how secondary buyers pool demand for a name; a rising count is a demand signal.
About Letter AI
Developer of a generative artificial intelligence platform designed to accelerate content creation for sales teams. The company's platform allows finding foundation models and prompts, visualizing results side by side and getting human feedback, automating upkeep, and hyper-personalizing sales assets and training, enabling sales teams to improve operational overhead, collect feedback, and monitor performance.
- Sector
- Information Technology
- HQ
- Chicago, IL, United States
- Founded
- 2023
- Employees
- 32
- Website
- letter.ai/
- Ownership
- Privately Held (backing)
Letter AI 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 Letter AI 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 Letter AI in its N-PORT filings yet. We sweep new filings monthly.