Sierra · Series B

Conversational AI agents for every business

Amount

$175M

Round

Series B

Valuation

$4.5B

Announced

Oct 2024

Investors

Lead investor

Greylock Partners

Participating investors

Sequoia Capital

Other Sierra rounds

Date	Round	Amount
May 2026	Series D	$950M	Details →
Sep 2025	Series C	$350M	Details →
Sep 2025	Series C	$350M	Details →
Oct 2024	Series B	$175M	Details →
Feb 2024	Series A	$110M	Details →
Feb 2024	Series A	$110M	Details →