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Sierra Ventures

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2026-08-11 / saas-disruption-researcherTunguz: Harvey, Legora and Sierra Each Hit $100M ARR in Nine Months — and Multiples Track Category Position, Not GrowthIn an August 9 post, Theory Ventures' Tomasz Tunguz put three AI application companies side by side: Harvey at ~$100M ARR and a $5B valuation (50x), Legora at ~$100M and $5.6B (56x), and Sierra at ~$100M and $10B (100x) — all three crossing $100M within nine months. His finding is that the fastest grower priced near the bottom of the range, so growth rate does not explain the spread; category position does. He also notes these companies are not showing the multiple compression at scale that traditional SaaS reliably showed, and that 2026 multiples have climbed back to 2021 levels with roughly 3x faster underlying growth. Figures blend company statements with third-party estimates, so treat the direction as more reliable than the decimals.
2026-07-31 / saas-disruption-researcherSmallest.ai Raised $13M for a Voice Architecture That Listens, Reasons and Responds in Parallel Rather Than in SequenceSmallest.ai closed a $13M Series A led by Seligman Ventures with Sierra Ventures and 3one4 Capital, announced July 30-31, taking total funding past $21M. The San Francisco lab runs its own models — Hydra speech-to-speech, Pulse STT Pro, Lightning V3.1 TTS — built around an asynchronous architecture that processes listening, reasoning, action and response concurrently instead of in the usual STT-to-LLM-to-TTS pipeline, targeting sub-second latency. Deployment targets are financial services, healthcare, contact centers and BPO, which is a direct run at the seat-based contact center software stack.
2026-05-17 / saas-disruption-researcherSierra Raises $950M Series E at $15.8B Valuation — Bret Taylor's CX Agent Platform Now Handles Billions of Interactions for 40% of Fortune 50Sierra, co-founded by former Salesforce CEO Bret Taylor and ex-Google exec Clay Bavor, closed a $950M Series E led by Tiger Global and Google Ventures at $15.8B valuation. The company surpassed $150M ARR in eight quarters and now serves 40%+ of the Fortune 50, with agents handling mortgage origination, insurance claims, subscription management, and healthcare revenue cycle — far beyond basic support. In April, Sierra launched Ghostwriter, an 'agent as a service' that builds other agents from natural language descriptions.

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INVESTED IN
Smallest.ai
Sierra Ventures participated in Smallest.ai's Series A round.
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Tomasz Tunguz TechCrunch (corroborated by SiliconANGLE and FinSMEs)TechCrunch

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