AI customer support companies · sierra.ai

Sierra valuation, funding and revenue

Sierra sells a platform for building AI customer service agents to businesses, mostly large enterprises in financial services, healthcare, telecommunications, retail and travel.

Figures checked September 2026. Each one links to its source.

Latest valuation

$10B

September 2025, the company said. sierra.ai

Total funding

$350M+

Latest round only; no public total found.

Reported ARR

$150M+

February 2026, the company said. sierra.ai

Website visits

310K

Estimated, August 2026. -12% on the month before.

What is Sierra's valuation?

Sierra was valued at $10B in September 2025, the company said (sierra.ai). A private company's valuation is set when it raises money, so it can be well out of date between rounds.

How much funding has Sierra raised?

No public source states Sierra's total funding. The rounds below are the ones we could confirm; there may be others. The latest round was a $350M Venture round (series not disclosed) in September 2025, led by Greenoaks.

Date	Round	Amount	Led by	Valuation	Source
September 2025	Venture round (series not disclosed)	$350M	Greenoaks	$10B	sierra.ai

What is Sierra's revenue?

More than $150M ARR in February 2026, the company said (sierra.ai).
$100M ARR in November 2025, the company said (sierra.ai).

ARR (annual recurring revenue) is the yearly value of current subscriptions; annualized revenue scales a recent month or quarter up to a year. Neither is audited revenue. See what ARR is.

Sierra website traffic

Estimated monthly visits to sierra.ai across all channels, rounded. -5% over three months to August 2026.

May 2026330K
June 2026260K
July 2026350K
August 2026310K

Sierra competitors

AI companies in the same category (AI customer support companies) with a similar amount of website traffic. Similar size and category do not mean identical products; check what each one sells.

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About Sierra

Sierra sells a platform for building AI customer service agents to businesses, mostly large enterprises in financial services, healthcare, telecommunications, retail and travel. sierra.ai
Founded in 2023. siliconangle.com
Headquarters: San Francisco, California. finance.yahoo.com
Founders: Bret Taylor, Clay Bavor. sierra.ai
Sierra's own May 2026 announcement says the $950M round values it at 'over $15 billion'; the exact $15.8 billion post-money figure comes from press (Quartz, citing CNBC reporting). The two do not conflict. sierra.ai
The Feb 2026 ARR figure is stated as 'over $150M', so $150M is a floor, not an exact number. sierra.ai
Sierra did not name a series for its 2025 or 2026 rounds; some secondary sites call the May 2026 round a Series E, which was not confirmed in an allowed source. sierra.ai
Sierra's About page lists offices in New York, Atlanta, London, Singapore, Tokyo, Paris, Madrid, Toronto and San Francisco, 'where it all began'. sierra.ai

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Sources

Checked on 29 September 2026. Traffic figures are third-party estimates, not company-reported numbers.