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Sierra

Sierra helps businesses to build and deploy AI agents that communicate with users across channels such as chat, voice, email, and messaging.

sequoiabenchmark

$350M series-d · Sep 2025

Backed byGreenoaks Capital

Benchmark · 2026

Bret Taylor
Clay Bavor

Bret Taylor, Clay Bavor · 2 co-founders

2026series-e
Co-founders
2
current
Stage
series-e
Round
$950M
Source for series-e
Profile coverage3 of 8 · missing Location, Team size, Signals, Customers, Stack / tools · last run 8/12/2026

About

No description on file yet — this company is in the Atlas directory but has not been described. The enrichment pass ran but found no public description.

2 founders