Raised $1.6B across disclosed rounds.[10][1][6]

Series E closed May 2026, led by Tiger Global.[1][2][3][4]

post-money valuation is not publicly disclosed.

Named investors include Tiger Global, GV (Google Ventures), Benchmark, Sequoia Capital, Greenoaks Capital, ICONIQ Capital, Thrive Capital, Conviction.[1][6][10]

Bret Taylor, Co-Founder[10]

Clay Bavor, Co-Founder[10]

Erik Zahnlecker, Product[9][15]

Faith Parisi, Sales Director[9][15]

Tim Rafferty, Regional Vice President, Enterprise Sales[9][15]

Kaila F., Head of Sales Engineering[9][15]

Decagon · decagon.ai · Named directly alongside Sierra as an alternative in the Adaptation AI independent analysis piece, framed as the primary head-to-head choice for buyers weighing Sierra against alternatives for enterprise AI customer service agents.[16]

Salesforce (Agentforce) · salesforce.com · Named in independent analyst coverage (GTMLens, TopReviewed) as the incumbent platform threat to Sierra — same enterprise buyer, same CX workflow, and a direct substitute for companies already on Salesforce Service Cloud.[18][19]

Intercom · intercom.com · Listed as a Sierra alternative in the CBInsights competitors page; same buyer (CX/support budget owner), same channel (chat), and same deflection-first use case.[17]

Zendesk · zendesk.com · Listed as a Sierra alternative in the CBInsights competitors page; same enterprise CX buyer and same support-ticket-resolution workflow that Sierra targets for displacement.[17]

The customer proof is company-sourced only. No independent source in this ledger confirms it.[13]

Ask for one referenceable production customer.

Not a recommendation. The first thing this ledger cannot answer.

Filled in the side panel for invited readers. This card carries sourced facts only.