Sierra · Series D

Conversational AI agents for every business

Amount

$950M

Round

Series D

Valuation

$15.8B

Announced

May 2026

Investors

Lead investor

Google Ventures

Participating investors

Tiger Global Management

Notes

Tiger Global / GV led at $15.8B val.

Other Sierra rounds

Date	Round	Amount
Sep 2025	Series C	$350M	Details →
Sep 2025	Series C	$350M	Details →
Oct 2024	Series B	$175M	Details →
Oct 2024	Series B	$175M	Details →
Feb 2024	Series A	$110M	Details →
Feb 2024	Series A	$110M	Details →