Founders Fund, the venture capital firm co-founded by Peter Thiel, closed a $6 billion growth fund on 1 May, its largest ever and its fourth dedicated late-stage vehicle. The majority of the capital, $4.5 billion, came from limited partners including sovereign wealth funds. The remaining $1.5 billion came from the firm’s own partners and employees, including Thiel. The fund was assembled in less than a year, the fastest succession in the firm’s two-decade history, because its predecessor, a $4.6 billion fund, was spent in under twelve months. Founders Fund had planned to deploy the prior fund over two to three years. Instead, it approached companies before they had begun formal fundraising, writing an average check of roughly $600 million to seven companies. The $6 billion replacement is expected to back about a dozen startups. If the prior fund is any indication, the money will not last as long as the plan suggests.

The checks

The prior fund’s investment sheet explains the velocity. Founders Fund invested $1.25 billion in Anthropic’s $30 billion funding round at a $350 billion valuation, its first position in the company behind Claude. It invested $1 billion in Anduril Industries, the defence technology company co-founded by Trae Stephens, who is also a general partner at the firm. The fund also backed financial technology firms Stripe and Ramp, coding startup Cognition AI, and OpenAI, which Founders Fund has invested in multiple times. Seven companies. An average check of $600 million. Each investment was larger than the entirety of most venture capital funds raised anywhere in the world.

The check sizes reflect a market in which the most sought-after AI companies raise rounds that make traditional venture metrics meaningless. Anthropic’s round was $30 billion. At that scale, $1.25 billion buys roughly four per cent of the company. Sequoia joined the same Anthropic round, and both firms were competing alongside Google, Amazon, and sovereign wealth funds for allocation. When the entry price to a single company is a billion dollars, the fund that writes the check must be measured in the tens of billions or it is competing for the scraps.

The arms race

Founders Fund is one of at least four firms that raised mega-funds this year. Sequoia Capital closed roughly $7 billion in April under new leadership. Thrive Capital raised $10 billion. Andreessen Horowitz has raised $15 billion. In the first quarter of 2026, $297 billion flowed into startups globally, 2.5 times the total from the previous quarter and the most venture funding ever recorded in a three-month period. The capital is concentrating in a small number of firms, backing a small number of companies, nearly all of which are building or deploying artificial intelligence.

The structural driver is that AI companies are expensive in a way that software companies never were. Training a frontier model costs hundreds of millions of dollars in compute. The infrastructure to serve it at scale, data centres, custom silicon, power supply contracts, costs billions more. Software companies could be launched with cloud credits and a credit card. The shift in venture capital from software to deep technology has changed the economics of the entire industry. A $500 million fund cannot write a $1.25 billion check. A $6 billion fund can. The venture industry was built to fund cheap ideas with expensive potential. It now funds expensive ideas with expensive potential, and the funds have grown to match.

The portfolio

SpaceX, which filed for the largest IPO in history in April and is expected to go public later this year at a valuation approaching $1.75 trillion, remains Founders Fund’s single largest and most valuable position. The firm was an early investor and has added to its holding across multiple rounds. One secondary market investor, Blue Owl Capital, reported a tenfold return on its SpaceX position ahead of the IPO and has already sold half. Anduril, valued at $30.5 billion after its June 2025 round led by Founders Fund, is reportedly pursuing an additional raise at roughly double that valuation. Anthropic’s implied valuation on secondary markets has more than doubled since Founders Fund invested, exceeding $800 billion.

The mathematics of the prior fund, if these valuations hold, is exceptional. A $1.25 billion Anthropic position bought at a $350 billion valuation could be worth more than $2.5 billion at current secondary market prices. A $1 billion Anduril position at $30.5 billion could be worth $2 billion if the company raises at $60 billion. The SpaceX position, depending on when and at what price Founders Fund entered across its rounds, could represent returns that make the rest of the portfolio academically interesting but financially incidental. The concentrated strategy that Founders Fund has always practised, a small number of very large bets, is designed for precisely this kind of market: one in which a handful of companies absorb the majority of private capital and, if they go public successfully, generate the majority of returns.

The shift

What Founders Fund’s trajectory illustrates is the distance between venture capital as it was conceived and venture capital as it is practised by the firms with enough capital to matter. The original model was a portfolio approach: invest relatively small amounts in many companies, accept that most will fail, and rely on the outliers to generate returns. Founders Fund has always operated differently, concentrating its capital in high-conviction bets. What has changed is the scale. When the average check is $600 million, the fund deploys in under a year, and the portfolio consists of seven companies, the enterprise resembles a sovereign wealth fund or a late-stage private equity shop more than it does the Sand Hill Road firms of the 1990s that invented modern venture capital.

The $6 billion fund will back roughly a dozen companies. Twelve investments, each large enough to be news on its own. The $1.5 billion contributed by Founders Fund’s own partners and employees, a quarter of the total, is itself larger than most venture capital funds. It is also a signal: the people closest to the portfolio believe the opportunity justifies putting an extraordinary amount of their own money at risk. The venture industry has not consolidated. It has bifurcated into a small number of mega-funds that compete for positions in the same handful of AI and defence technology companies, and a much larger number of smaller funds that operate in a different market entirely. Founders Fund has made its choice about which side of that divide to occupy. The $6 billion is the price of admission.