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Letter AI

Chicago, IL · Founded 2023 · Privately Held (backing)

Developer of a generative artificial intelligence platform designed to accelerate content creation for sales teams. Letter AI is based in Chicago, IL and was founded in 2023. Its last reported valuation was $306 million in Feb 2026. It has raised $53.4 million.

Last reported valuation
$305.5M
Oct 2026
Priced at
—
Total raised
$53.4M
Last round
—

Letter AI key facts

as of Oct 2026
  • Developer of a generative artificial intelligence platform designed to accelerate content creation for sales teams.
  • Letter AI is valued at approximately $305.5M as of Oct 2026 (last reported valuation).
  • 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).
Last reported valuation
LOW confidence
$305.5M

Letter AI's last reported valuation, Feb 2026. Nothing priced has surfaced since.

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Letter AI funding rounds

No rounds on record

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.

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Vehicles formed to buy Letter AI shares

secondary demand · SEC Form D filings

In 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.

The vehicle list — each sponsor, filing date, amount sold and investor count — is a Pro table. Unlock the 1 vehicle →

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Letter AI valuation

Letter AI's last reported valuation was $306 million in Feb 2026. No priced round, secondary trade or fund mark has surfaced since.

Institutional holders and vehicles

In the last 12 months, 1 investment vehicle was formed to buy Letter AI shares, reporting $3.3 million sold to 13 investors, per SEC Form D filings (most recent May 2026).

Letter AI investors

10 investors are on record for Letter AI, including Y Combinator, Pioneer Fund, Soma Capital and Battery Ventures. By type, the record holds 6 venture capital firms and 1 growth equity firm.

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)

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