Sierra

Active#1 worldwide · AI contact centers

Estimated valuation · AI contact centers · United States

Builds autonomous AI agents that handle customer service conversations over chat and voice for large consumer brands, with outcome-based pricing tied to resolved interactions.

Business software›AI contact centers sierra.ai

HQUnited States

Last roundGrowth round · May 2026

Estimated valuation

AI · AI contact centers ranking (worldwide)

≈ USD 15bnUSD 12–19bn · Decacorn

Hundreds of k$

Millions $

Tens of M$

Hundreds of M$

Unicorn

Decacorn

Hectocorn

Anchor: Last known equity round: Growth round · USD 950M · May 2026
Published valuation: USD 15bn · May 2026

An indicative editorial estimate produced by AI, imperfect by nature: neither a financial valuation nor investment advice. Only the market sets a company’s value. Method

Uback rankings

How the AI ranks →

Ranking	Tier	Rank	Edition	Next update
AI contact centers · worldwide	Top 50	#1	Edition 0 · Oct 2026	9 Dec 2026

Rank historyOct 2026 · #1 AI contact centersFirst edition: no movements yet.

Funding history

Date	Round	Amount	Type	Investors
May 2026	Growth round	USD 950M	Equity	Tiger Global, GV

Rounds as cited by Uback’s rankings. Equity, debt and grants are shown separately; only equity rounds count towards the valuation anchor.

Independent analyses

By industry professionals & analysts

Industry professionals and financial analysts can publish their own analysis of Sierra as a PDF. It must answer at least one of these four questions, and stick to them:

AI valuation: $15BUndervalued or overvalued?

Versus competitorsHow does it compare?

Who should acquire itStrategic buyers, and why

Who should it acquireAcquisition targets, and why

Publish an analysisName, role and LinkedIn shown · public sources only

Analyses are the opinion of their authors, not of Uback. They are checked before publication.

Invest

Back Sierra whether or not it has agreed: your intention joins the pool on Sierra, passed to the Fundraising Desk of its country once it reaches critical mass. Backing on Uback (pronounced “you back”) means declaring an Interest (free) or an Intention (coming soon). Backing does not mean that this company is raising funds or that a shareholder is selling shares, and it is not a commitment to invest. Any deal, through a funding round or a sale by an existing shareholder, is handled by a partner desk: the Fundraising Desk of the country for a round, the Secondary Sales Desk assigned to the company for a sale.

Back Sierra Or back ai contact centers worldwide

Pool on SierraBelow threshold

BackersBelow threshold

Paid intention · valid for life · movable until you sign with a partner desk. If the company does not follow up, Uback invites its Backers to move their intentions to a competitor or a similar company. Investing in non-listed companies carries a risk of losing all the capital invested.

Do you run Sierra?

Claim this profile to correct data, add your logo and description, or tell Uback about an upcoming round.

Claim this profile Report an upcoming round → Report an error →

Are you a shareholder?

Considering selling some of your shares? Tell Uback privately. Nothing is published without your consent, and never a price or a volume.

Tell Uback privately

What the AI reads

Read by the AI at the next edition.

Comparable companies in ai contact centers

Full ai contact centers ranking →

Wonderful#2IsraelUnicorn Decagon#3United StatesUnicorn Parloa#4GermanyUnicorn Uniphore#5United StatesUnicorn

Last updated: Oct 2026Report an error

Uback is a content publisher and an aggregator of non-binding expressions of interest. It provides no investment advice, receives no mandate and takes part in no transaction. Rankings, ranges and brackets are editorial estimates produced by AI, purely indicative.