May 4, 2026LATEST SOURCED
primary
Series E
Tiger Global (lead) · GV (lead)
Amount$950MValuationOver $15B (issuer); $15.8B reported
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Captables
SI
HISTORICAL P100 / #35
Sierra
AI Customer Service · United States
Historical ranking valuation$10.0BSource snapshot: Jun 19, 2026
Disclosed primary funding in this record
$350MSum of non-overlapping disclosed USD amounts in confirmed primary financing entries in this record, including separately labeled equity components; not verified lifetime funding. Excludes amounts already included in a later round, announced, reported, database-only, debt, secondary and unclassified events.
1 confirmed primary rounds with disclosed USD amounts · Record through 2026-09-24THE BUSINESS
Get to know Sierra.
Sierra provides customer-facing AI agents for businesses. Its company materials describe building and deploying agents across chat, SMS, WhatsApp, email and voice channels for customer-service and growth workflows.
Sierra product overview ↗Source checked Sep 24, 2026Valuation history
Valuations reported at the time of each round.
Funding history
Funding rounds, debt and other financing events.
5sourced events · record as of 2026-09-24
Sierra said on May 4, 2026 it was raising $950M at over $15B; that wording does not establish a completed close, although Axios described $950M raised and $15.8B post-money. The row is announced, not included in the confirmed-raised sum. Sierra confirmed $350M in 2025; Axios reported $175M in 2024. Contemporaneous reporting splits the $110M available at launch into an initial $25M from Benchmark and a further $85M from Sequoia. Their imported series labels and exact closings are unverified.
Sep 4, 202504
primary
Series D
Greenoaks (lead)
Amount$350MValuation$10B
Oct 202403
primary
Series C
Greenoaks Capital (lead) · Thrive Capital · ICONIQ
Amount$175MValuation$4.5B
Feb 202402
primary
Launch financing, second tranche (series unverified)
Sequoia Capital (lead)
TechCrunch says a further $85M came from Sequoia after an initial $25M from Benchmark; both sum to the reported $110M available at launch. February is the announcement month, not a verified closing date.
Amount$85MValuationUndisclosed
202301
primary
Initial financing (series unverified)
Benchmark (lead)
TechCrunch retrospectively identifies an initial $25M from Benchmark. The exact 2023 closing date and legal series are not established. This amount is part of the $110M total reported at Sierra's February 2024 launch.
Amount$25MValuationUndisclosed
Financing participants
Investors, lenders and other parties named in funding announcements.
Tiger Global
Series E · May 4, 2026 · Lead participant · primary · Announced · Announced source ↗
GV
Series E · May 4, 2026 · Lead participant · primary · Announced · Announced source ↗
Greenoaks
Series D · Sep 4, 2025 · Lead participant · primary · Confirmed · Confirmed source ↗
Greenoaks Capital
Series C · Oct 2024 · Lead participant · primary · Reported · Reported source ↗
Thrive Capital
Series C · Oct 2024 · Participant · primary · Reported · Reported source ↗
ICONIQ
Series C · Oct 2024 · Participant · primary · Reported · Reported source ↗
Sequoia Capital
Launch financing, second tranche (series unverified) · Feb 2024 · Lead participant · primary · Reported · Reported source ↗
Benchmark
Initial financing (series unverified) · 2023 · Lead participant · primary · Reported · Reported source ↗
Ownership evidence
Opening ownership research…
Captables coverage
Deals / Captables
Sierra's latest round: $950M Series E
Sierra's latest public financing record lists $950M in its Series E dated May 4, 2026 at a reported valuation of $15.8B. Captables places the event in the company's disclosed funding history.
Captables Newsroom · 58d ago