This is not what Jane Street does. Before everything else, it is important to comprehend that. One of the most lucrative trading operations in the world, the company operates out of a set of floors in a midtown Manhattan office building that most people pass by without giving it a second look. It is also one of the most careful with its financial decisions. It doesn’t look for outside funding. Young managers with huge ideas and little experience are not given allocations. Therefore, Jane Street’s covert support of Situational Awareness, the AI-focused hedge fund managed by Leopold Aschenbrenner, 24, says more than a thousand news releases could.
By all standards, Aschenbrenner is a unique person in the hedge fund industry. Under circumstances that at the time attracted some public attention, he left OpenAI and moved swiftly to establish a fund centered around a single, focused thesis: that artificial intelligence is not a sector trend but rather a structural shift in the way the global economy generates and distributes compute, and that the companies creating the underlying infrastructure for that shift are routinely undervalued by markets still thinking in older categories.
Situational Awareness, the fund he founded on that concept, now has assets of more than $20 billion. Since its beginning, it has returned almost 1,000%. It was up over 270% through May alone. When expressed simply, these numbers sound like a misprint. The Jane Street Situational Awareness investment is noteworthy due to its statements regarding both Jane Street and the fund. It is truly uncommon for a company as selective as Jane Street to use outside funding, the type of uncommon that causes industry insiders to reevaluate their preconceived notions about Aschenbrenner’s business practices.
Posting remarkable results in a brief period of time while AI sentiment is high is one thing. Attracting the kind of institutional support from businesses that have witnessed every cycle, every crowded trade, and every story that seemed solid until it wasn’t is quite another.
Because it reflects a thesis that has developed in ways not anticipated by the original AI trade, the portfolio itself is worth attentively scrutinizing. At the beginning of the AI investment cycle, semiconductors—Nvidia in general and the firms that supplied the processors that enabled huge language models—were clearly in the lead. Situational awareness has progressed beyond that, or at least concurrently with it.
The fund currently favors early-stage semiconductor firms like MatX, which is attempting to create AI-specific hardware that threatens Nvidia’s supremacy from below, and what it refers to as neoclouds, which include businesses like Nebius that offer GPU-dense computing infrastructure outside of the hyperscaler duopoly. These wagers are less visible, less liquid, and they demand the exact kind of conviction that either silently vanishes from the track record or appears brilliant in hindsight.
The portfolio’s most prominent figure is the Anthropic investment, which makes up over 20% of the fund’s total assets and is the main driver of those remarkable return numbers. Aschenbrenner’s early and focused role in the company, which has now developed into one of the most widely followed AI labs in the world, is the kind of call that, if it holds, defines a career and, if it doesn’t, is quietly minimized. It has been held thus far.
The co-investment of Jane Street and Situational Awareness in Fluidstack, an AI cloud computing startup, indicates that the partnership has evolved from passive allocation to something more cooperative—two companies with radically different public personas finding enough common ground to jointly lead a private round.
