Sierra AI Stock Price, Valuation & IPO
Private company — Sierra AI is privately held. Its shares are not listed on any public exchange and can only be accessed through private secondary transactions.
Status source: AXEVIL investment team
$99.24 per share (AXEVIL consensus estimate)
Source: AXEVIL consensus of recent secondary transactions · as of 27 October 2026
Last round valuation: $16B
Source: E, May 2026, post-money
Total raised: $1.435B
Data last updated: 27 October 2026
About Sierra AI
Enterprise AI-agent platform for customer service, founded by Bret Taylor (OpenAI board chair) and Clay Bavor. Raised $950M in a Series E in May 2026 at a $15.8B valuation (led by Tiger Global and GV). Annual recurring revenue is about $150M, with demand for enterprise AI agents growing fast.
Sierra is a platform on which large companies build their own software agents: they answer customers by voice and in chat, carry out operations in the company's systems themselves, and are paid for only on resolved requests. Founded in 2023 in San Francisco. The share price rose from $57.03 in the Series D to $81.52 in the Series E — up 43% in eight months. Horizon, launched in July 2026, expands what is being sold from the contact-center budget to the operations budget. In July 2026 SoftBank Corp became Sierra's exclusive reseller in Japan. Current valuation is $15.8B from a Series E (May 2026), against $10B eight months earlier; $1.435B raised across five rounds.
- Sector: AI / Enterprise
- Headquarters: San Francisco, USA
- Founded: 2023
Key highlights
- The valuation rose from $10B to $15.8B in eight months. The share price went from $57.03 in the Series D to $81.52 in the Series E — up 43% over that period.
- The product has moved out of support and into core business processes. Horizon, launched in July 2026, expands what is being sold from the contact-center budget to the budget of the operational work itself, where the price per resolved task is an order of magnitude higher.
- A sales channel has appeared that the company could not have built itself. In July 2026 SoftBank Corp became Sierra's exclusive reseller in Japan, where enterprise procurement is barely open to a foreign vendor without a local partner.
- The company grows by buying teams, not only by hiring. In 2026 it acquired Opera Tech and Takeoff, which closes what takes longest to build alone — local sales and domain expertise.
Funding rounds
| Date | Round | Price / share | Post-money valuation |
|---|---|---|---|
| 4 May 2026 | E | $81.52 | $16B |
| 4 September 2025 | D | $57.03 | $10B |
| 28 October 2024 | C | $28.31 | $4.5B |
| 13 February 2024 | B | $6.65 | $950M |
Latest news
- Sierra and Stripe gave AI-agents the ability to accept card payments directly during a phone call — 20 October 2026
- Sierra, Meta, Walmart, Stripe and Shopify are developing an open standard Personal Agent Protocol for the interaction of personal AI agents with businesses — 6 October 2026
Frequently asked questions
How can I buy Sierra AI stock before the IPO?
Not on a public exchange — Sierra AI is privately held. Shares change hands only in private secondary transactions. AXEVIL structures those as dedicated US special purpose vehicles for accredited investors, subject to availability and to the rules of your jurisdiction.
What is the Sierra AI stock price?
A private company has no single official share price. AXEVIL's consensus estimate is $99.24 per share as of 27 October 2026. Its most recent round implied a post-money valuation of $16B (May 2026).
What is Sierra AI's valuation (net worth)?
Sierra AI's most recent funding round valued the company at $16B post-money (May 2026) — the latest primary-market measure of what the company is worth. Secondary trades can price its shares above or below that round.
When will Sierra AI IPO?
No listing has been announced. AXEVIL does not forecast IPO dates — this page states what has actually been filed or reported, with the date it was last checked.
Is Sierra AI publicly traded?
No. Sierra AI is a private company and its shares are not listed on any public exchange.
Does Sierra AI have a stock symbol?
No. Sierra AI has no ticker symbol because its shares are not listed on any exchange; a symbol is assigned only at an IPO or direct listing.
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Risk disclosure
Nothing on this page is an offer to sell or a solicitation to buy any security, and it is not investment advice. Valuations and share prices shown here are AXEVIL estimates built from primary sources — filings, announced rounds and completed secondary transactions — not quoted market prices, and they can be revised. Private-company shares are illiquid, may be impossible to sell, and the entire amount invested can be lost. Availability depends on your jurisdiction and on accredited-investor status.