Sierra

At Sierra, we’re creating a platform to help businesses build better, more human customer experiences with AI.

Latest funding

$950M Series B+ · May 4, 2026

Led by GV · Source: techcrunch.com

Total raised: $1.58B across 4 sourced rounds

All 4 rounds ↓

Website: sierra.ai.

X: @SierraPlatform · 13,408 followers.

LinkedIn: sierra.

Stage: Series B+.

Based in: San Francisco, United States.

Founded: 2023.

Total raised: $1.58B in 4 sourced rounds.

Last round: May 4, 2026 · 195 days ago.

Headcount: 101–250 employees.

On Recent Funding since: Sep 29, 2026.

Signals

X account@SierraPlatform · created Feb 10, 2024 (2 years old) · 13,408 followers

Website registeredDec 16, 2017 (8 years old)

About Sierra

We are primarily an in-person company based in San Francisco, with growing offices in Atlanta, New York, London, Paris, Madrid, Munich, Singapore, Japan, and Sydney.

TIMELINE · MONEY RAISED

Sierra | 3 days from X account to first raise on record

@SierraPlatform·Raised $1585M in 4 sourced rounds·1 signal before the first raise

Money raised, round by round (amounts linked to their source). Pins are dated signals; hover the icons for dates.

Funding rounds

Date	Round	Amount	Lead	Source
May 4, 2026	Series B+	$950M	GGV	techcrunch.com
Sep 4, 2025	Series A	$350M	GGreenoaks	axios.com
Oct 28, 2024	Seed	$175M	GGreenoaks	techcrunch.com
Feb 13, 2024	Round	$110M	BBenchmark	fundraisingfox.com

Timeline

February 10, 2024
X account created
December 16, 2017
Website created

Founders and team

BT
Bret Taylor Founder

@btaylor · LinkedIn · source: sierra.ai
CB
Clay Bavor Founder

@claybavor · LinkedIn · source: sierra.ai
AM
Arup Malakar software engineer
ZS
Zuzanna Skoczylas Agent Engineer

Acquisitions

Acquired company	Price	Announced
AAnon	Not disclosed	Nov 5, 2026 · Unite.AI
TTakeoff	Not disclosed	Jul 23, 2026 · MSN
FFragment	Not disclosed	Apr 23, 2026 · TechCrunch
OOPERA TECH	Not disclosed publicly	Mar 27, 2026
RReceptive AI	Not disclosed publicly	Date not given

Investors

Companies like Sierra

KKndrdSeed · Mar 2019
HHeadway$100M Series B+ · Jul 2024
SStripeSeries B+
CClockout$3.5M Seed · Oct 2026
CComestai$1.74M Pre Seed · Sep 2026
RRecall.ai$38M Series B+ · Sep 2025

Other companies backed by GV

BBlockaid$40M Series B+ · Nov 2026
LLarridin$30M Series A · Nov 2026
TTamr$21M Series B+ · Oct 2026
BBlacksmith$66M Series B+ · Oct 2026
FFlapping Airplanes$1B Series A · Oct 2026
EEstuary Biotherapeutics$103M Series A · Oct 2026

GV portfolio →

Sources and API

Every amount links to the page it came from. * Estimated from an accelerator's published standard deal, not a company-specific disclosure. How Recent Funding sources and verifies funding data. The same data as JSON: /api/v1/companies/sierra (get a free API key).