Sierra Raises $950 Million In Series E Round Led By Tiger Global And Google’s GV

Sierra, the AI startup cofounded by OpenAI chair Bret Taylor and Clay Bavor, raised $950 million in a Series E round led by Tiger Global and Google’s GV, with participation from Benchmark, Sequoia, Greenoaks and others, pushing its post-money valuation to $15.8 billion from $10 billion last fall. The company, which builds AI customer service agents for enterprise clients, says the new capital will help it scale amid intensifying competition in the fast-growing AI agents market and deepen its lead as demand from large enterprises accelerates. FOUNDERS: Bret Taylor & Clay Bavor INVESTORS: Tiger Global, Google’s GV, Benchmark, Sequoia & Greenoaks ROUND: Series E AMOUNT: $950,000,000 HQ: San Francisco, California #VentureCapital #Sierra #BretTaylor #ClayBavor #TradedVC

More Deals

View All

Olix Raises $312 Million In Series B Funding At $3.3 Billion ValuationOlix, a UK-based AI chip startup founded by James Dacombe, has raised $312 million in a Series B funding round at a $3.3 billion valuation, more than tripling its valuation from $1 billion just six months earlier. The round was backed by investors including Arm, Fundomo, Hudson River Trading, Reed Hastings, and the UK government’s Sovereign AI venture fund. Olix is developing a suite of specialized AI inference chips connected through a novel photonic interconnect, an approach designed to improve performance, efficiency, and scalability compared with traditional architectures. The new funding will support development of its custom silicon platform and help bring its first chip to customers in the second half of 2027. FOUNDER: James Dacombe INVESTORS: Arm, Fundomo, Hudson River Trading, Reed Hastings, UK Government Sovereign AI Venture Fund & Creandum ROUND: Series B AMOUNT: $312,000,000 VALUATION: $3,300,000,000 HQ: London, United Kingdom #VentureCapital #Olix #JamesDacombe #TradedVC

Zenity Secures $125 Million In Series C Funding Led By Norwest And Multiple InvestorsZenity, a Tel Aviv, Israel-based provider of an AI security and governance platform for AI agents, raised $125 million in Series C financing led by Norwest, with participation from Qumra Capital, SoftBank Vision Fund 2, Hitachi Ventures, LG Technology Ventures, Vertex Ventures, Third Point Ventures, DTCP, and Intel Capital. Co-founded by CEO Ben Kliger and CTO Michael Bargury, the company will use the new funding to accelerate platform innovation, expand Zenity Labs, grow its presence across Europe and Asia Pacific, and meet rising enterprise demand for AI agent security. FOUNDERS: Ben Kliger & Michael Bargury INVESTORS: Norwest, Qumra Capital, SoftBank Vision Fund 2, Hitachi Ventures, LG Technology Ventures, Vertex Ventures, Third Point Ventures, DTCP & Intel Capital ROUND: Series C AMOUNT: $125,000,000 HQ: Tel Aviv, Israel #VentureCapital #Zenity #BenKliger #MichaelBargury #TradedVC

Horizon3 Raises $250 Million In Series E Round Led By NightDragon And NEAHorizon3, a San Francisco-based cybersecurity startup, raised $250 million in a Series E round at a valuation exceeding $2 billion, bringing its total funding to $428.5 million. The round was co-led by NightDragon and NEA, with participation from Acrew Capital, Blue Cloud Ventures, Demeter Group, EDBI, PSG, SAIC, Sapphire Ventures, Craft Ventures, Prosperity7 Ventures, Qualcomm Ventures, Ridge Ventures, SignalFire, and others, and the company said it will use the proceeds to expand globally and scale its AI-native security platform NodeZero; CEO Snehal Antani said the company is also investing in autonomous AI agents that can remediate vulnerabilities alongside its offensive security capabilities. FOUNDERS: Snehal Antani & Anthony Pillitiere INVESTORS: NightDragon, NEA, Acrew Capital, Blue Cloud Ventures, Demeter Group, EDBI, PSG, SAIC, Sapphire Ventures, Craft Ventures, Prosperity7 Ventures, Qualcomm Ventures & Ridge Ventures, SignalFire ROUND: Series E AMOUNT: $250,000,000 VALUATION: $2,000,000,000 HQ: San Francisco, California #VentureCapital #Horizon3 #SnehalAntani #AnthonyPillitiere #TradedVC