IREN Ltd (IREN) has become one of 2025's wildest AI infrastructure plays, and the numbers tell the story. The stock is up 285% in six months after the company executed a dramatic transformation from crypto mining into AI cloud and GPU services. That kind of run catches attention, and legendary hedge fund manager Paul Tudor Jones just made his move—not by buying more, but by cashing out most of his chips.

According to recent regulatory filings, Tudor Investment cut its IREN position by more than 90%, booking profits after what appears to be a roughly 300% gain from the fund's average entry price. Based on filing data and price movements, Jones likely turned about $13 million into approximately $53 million, pocketing around $40 million in gains before trimming over 90% of the stake.

The stock hasn't slowed down much since, but the billionaire's exit adds an interesting wrinkle to a name that's been trading almost purely on momentum.

How a Microsoft Deal Flipped the Script

There's a reason IREN keeps popping up on trader watchlists: execution. Last November, the company announced a multi-year, $9.7 billion AI cloud contract with Microsoft Corp (MSFT). The deal involves providing Nvidia Corp (NVDA) GB300-powered compute capacity over five years, complete with customer prepayments and locked-in GPU deployments through 2026 at IREN's Texas facilities.

The infrastructure backing this isn't trivial—secured power capacity and liquid-cooled data centers designed specifically for AI workloads at scale. In a single announcement, IREN vaulted from speculative pivot play to legitimate hyperscaler partner, a leap very few AI infrastructure companies have managed to pull off.

Big Capital Raise Triggers Dilution Debate

The ride hasn't been smooth. IREN recently raised approximately $2.3 billion through a combination of convertible notes and equity offerings. The capital is earmarked for GPU purchases and data center expansion, but the announcement triggered short-term volatility and sparked heated debate about dilution.

Here's the tension: management is scaling aggressively while demand is both visible and contracted, which is exactly what growth investors typically want to see. But the market's reaction has been mixed—some traders focus on the capital structure concerns while others treat this as a pure execution story backed by real contracts.

Reading Between the Lines on Jones' Exit

Paul Tudor Jones trimming his position doesn't necessarily signal a loss of faith in the company. It looks more like textbook profit management after an explosive move. When you're sitting on a 300% gain in a volatile name, taking chips off the table is just prudent portfolio management, especially for a fund managing billions across multiple positions.

For IREN, the more important signals remain intact: the Microsoft partnership, phased GPU deployments running into 2026, and a power infrastructure specifically built to handle AI computation at scale. The company has moved from "interesting idea" to "contracted revenue partner with a tech giant."

The real question facing the stock now isn't about legitimacy—the Microsoft deal settled that debate. It's whether IREN can absorb the dilution from its recent capital raises without killing the momentum that made it one of the most talked-about AI infrastructure names of the year. That's a very different challenge than proving the business model works.