Fireworks AI, an enterprise AI inference platform headquartered in San Mateo, California, announced on July 16, 2026 that it has closed a $1.505 billion Series D funding round at a post-money valuation of $17.5 billion.
<cite index="7-7">The round was led by Atreides Management, Index Ventures, and TCV, with participation from existing investors Evantic, Lightspeed Venture Partners, and NVIDIA.</cite> <cite index="12-6">Additional investors include 20VC, Bessemer Venture Partners, Insight Partners, Lone Pine Capital, Menlo Ventures, Operator Collective, Ontario Teachers' Pension Plan, Original Capital, Prysm Capital, Quantum Capital, and TIME Ventures.</cite>
Revenue and Platform Growth
The raise coincides with a significant revenue milestone. <cite index="7-8">The funding comes as Fireworks surpasses $1 billion in annualized revenue run rate (ARR), up 5x year-over-year from its last funding round.</cite> <cite index="7-9">Over the same period, the company nearly tripled the daily volume of tokens served on its platform, from 15 trillion to more than 40 trillion.</cite>
<cite index="1-3">More than 95% of those tokens come from models specialized on customers' proprietary data and optimized for specific jobs.</cite> <cite index="13-7">Fireworks' platform enables enterprises to take open-source AI models and customize them on proprietary data, workflows, and use cases, then serve those specialized models in production at scale.</cite> <cite index="13-8">Fireworks offers more than 200 models across text, image, and multimodal formats, with support for major new open-source releases typically available within hours of launch.</cite>
Founding and Background
<cite index="2-11">Founded in 2022 by CEO Lin Qiao and six co-founders, all former Meta engineers, Fireworks offers infrastructure that lets enterprises fine-tune general-purpose Large Language Models (LLMs) on their own data and serve them in production.</cite> <cite index="6-6">Qiao previously led the PyTorch team at Meta; the Redwood City company runs an inference platform that helps businesses turn general-purpose models into "specialized intelligence" trained on their own data.</cite>
<cite index="14-10">Named customers include Cursor, Perplexity, Notion, Sourcegraph, Uber, DoorDash, Shopify, and Upwork, spanning code assistance, conversational AI, enterprise search, and agentic workflows.</cite> <cite index="9-4">Fireworks once received over half of its revenue from coding startup Cursor, but has diversified as more companies turn to open models, CEO Lin Qiao said.</cite>
Valuation Trajectory and Use of Proceeds
<cite index="12-8">The Series D came nine months after Fireworks' $250 million Series C in October 2025 at a $4 billion post-money valuation.</cite> <cite index="12-7">The deal priced above the roughly $15 billion valuation Fireworks had initially sought, once investor demand became clear.</cite>
<cite index="8-2">The new capital will be used to expand compute infrastructure, grow its engineering team, and deepen partnerships with cloud providers including Microsoft and NVIDIA.</cite> <cite index="2-12">The company's workforce stands at roughly 200, and CEO Qiao said she plans to triple that figure before the year is out.</cite>
Market Context
<cite index="2-8,2-9">Fireworks co-founder and CEO Lin Qiao said the company's cost advantage over equivalent closed models is a key driver of growth, noting: "Our cost compared with the equivalent-quality closed model is five to 10 times cheaper."</cite> <cite index="2-10">Rising costs for the latest AI models have made finance executives increasingly uneasy, prompting them to steer employees toward open-source options.</cite>
<cite index="16-6">NVIDIA's involvement is notable given Fireworks runs its inference stack largely on NVIDIA Graphics Processing Units (GPUs), mirroring the chipmaker's pattern of investing in its own largest customers.</cite> <cite index="3-11,3-12">Earlier in 2026, Fireworks partnered with Microsoft, giving Microsoft customers access to AI models on the Fireworks platform, powered by computing resources from more than 20 different infrastructure providers.</cite>