CoreWeave IPO: Magnetar turns $850M into $4.3B, VCs miss out on biggest AI infrastructure listing in years

Summary

CoreWeave's IPO began trading at $40 per share, delivering a massive windfall to Magnetar Capital while leaving major venture firms underwater. Magnetar turned an $850 million equity stake into $4.3 billion at the IPO price. The hedge fund's dominance in CoreWeave's cap table is striking, with its name appearing 157 times in the company's IPO prospectus, more than twice as often as the CEO.

Magnetar backed CoreWeave when traditional venture capital wouldn't. Four years ago it extended a $50 million loan and continued doubling down through every subsequent round—Series B at $5.50 per share, Series C at $38.95, and a tender offer at $47. The strategy mixed debt and equity. Magnetar structured loans against CoreWeave's inventory of Nvidia chips and collateralized them against the company's contracts with Microsoft and Nvidia, yielding $66 million in interest so far. Those loans mature by decade's end. The firm also secured a put option allowing it to sell back its stake to CoreWeave if the stock fell within two years of the IPO, crucial downside protection given that last November's private placement was at $47 per share, 17.5% above today's IPO price.

Venture capital largely missed this opportunity. Magnetar managing partner David Sniderman said the firm was among the first to get comfortable lending against high-performance compute, suggesting VCs had a structural blindness to capital-intensive businesses. Conventional venture wisdom avoids funding data centers and infrastructure plays because they are harder to underwrite and carry higher leverage risk. CoreWeave's debt-to-equity ratio is extraordinarily high.

The company's path to this moment tested that thesis severely. CoreWeave was originally a cryptocurrency mining operation. When Ethereum transitioned from proof-of-work to proof-of-stake in fall 2022, mining became obsolete overnight. The founders—Michael Intrator, Brian Venturo, and Brandon McCuistion—repurposed their mining rigs and data center infrastructure into graphics rendering and AI compute, later pivoting into AI infrastructure as the category exploded. Early investors betting on founder quality over business plan proved prescient.

The IPO left visible casualties. Investment firms including Jane Street, Fidelity, BlackRock, and Neuberger Berman bought $650 million in stock at $47 per share in November and are now underwater. Magnetar and Kotou hedged their bets in that round with put options, a protection the November buyers did not secure.

Other stakeholders reveal the random composition of CoreWeave's early cap table. Lex Wexner, the former Victoria's Secret owner, invested $1 million through a trust now worth approximately $800 million. Nvidia owns roughly 3% of CoreWeave (worth about $700 million at the IPO price) after investing roughly $100 million in the Series B in early 2023, during the ChatGPT surge.

The company's product quality appears validated by third-party analysis. SemiAnalysis founder Dylan Patel released a ranking of GPU cloud providers and gave CoreWeave the only Platinum tier rating. Cruso, Together AI, Nebius, and Lepton AI landed Gold. Azure and Oracle also received Gold. AWS got Silver, and Google Cloud received Bronze.

Magnetar is now deepening its AI footprint beyond CoreWeave. The firm is expected to write one of the largest checks to OpenAI's $10 billion funding round this month. It launched a VC arm leveraging its CoreWeave relationship to invest in new AI startups in exchange for access to CoreWeave's Nvidia inventory. CoreWeave itself committed $50 million to that fund, a structure that makes sense for CoreWeave since AI application companies often have training and inference as their largest expense line items.

The IPO price came in lower than expected, priced Thursday night below initial guidance. Despite the markdown, Magnetar's return on capital and risk management through structured debt, secondary market participation, and downside protection mechanisms show how a well-capitalized hedge fund with lending expertise can approach a capital-intensive startup differently from traditional venture. Magnetar, founded by former Citadel traders, brought structured credit and risk management discipline to CoreWeave at scale.