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Inferact raises $150M seed round to scale vLLM inference engine, reaching $800M post-money valuation with backing from Andreessen Horowitz and Lightspeed.

PRIVATEOct 16, 2026

Amount Raised

$150 Million

Round Type

Seed

San FranciscoSoftwareArtificial IntelligenceMachine LearningNatural Language Processing

Investors

Lightspeed Venture PartnersAndreessen Horowitz

Description

Inferact, a San Francisco-based AI infrastructure startup founded by vLLM's core maintainers, has raised $150 million in seed funding announced on January 22, 2026. The round valued the company at $800 million post-money, with backing from Andreessen Horowitz and Lightspeed Venture Partners. Inferact plans to build commercial services around vLLM, an open-source tool for efficient LLM inference using PagedAttention technology. The company will offer serverless deployment options and advanced observability tools while maintaining the open-source nature of vLLM.

Company Information

Company

Inferact

Location

San Francisco, California, United States

About

Inferact is a startup that evolved from the open-source vLLM project, which specializes in AI inference technology. The company focuses on enhancing the deployment of large language models in applications, making the process faster and more cost-effective. With backing from prominent investors, Inferact aims to broaden its customer base and scale its AI solutions across various platforms. The project initially developed in UC Berkeley’s laboratory.

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Inferact raised. Fundz records a round at a median of 3.6 minutes from the SEC filing, with the decision-maker attached.

145 of these a day, filtered to the companies you pick, with the decision-maker attached.

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Fundz is a real-time business intelligence platform powered by agentic AI that proactively delivers personalized daily signals, including funding rounds, executive changes, M&A activity, 13F institutional filings, SEC 8-K events, investor activity, and website modifications, based on each user's watchlist and ICP. A trusted data source at firms such as BlackRock, Oracle, Kleiner Perkins, LinkedIn, HubSpot, and Cloudflare, Fundz democratizes the institutional-grade intelligence that previously required a PitchBook or Bloomberg terminal. Features include FundzWatch™ for automated website change detection, Daily Briefing for AI-powered daily briefings, and unified cross-signal alerts across 281,000+ organizations. Developers and data teams can access these signals programmatically via the Fundz Funding Data API, with transparent published pricing.