Sierra raises $950M Series E, valuation hits $15.8B
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- Sierra secured $950 M in a Series E round led by Tiger and GV, lifting its post‑money valuation to $15.8 B, up from $10 B in 2025.
- Bret Taylor founder of Sierra, helped attract Tiger and GV as lead investors.
- Tiger led the financing with GV, a major venture firms’ confidence in AI‑driven customer‑service platforms.
- Google is rolling out Gemini AI across Chrome and adding Mac apps, intensifying competition in consumer‑facing AI tools.
- Microsoft faces at least a three‑month delay in OpenAI services, a gap that rivals like Sierra can exploit.
Why it matters: Sierra and its backers gain $950 M of capital and a $15.8 B valuation, enabling rapid expansion of AI support agents; enterprises gain a new vendor while rivals like Microsoft risk losing AI‑service market share as OpenAI delays persist.
