ARK Venture Fund holds $69 million OpenAI stake, the largest share among major funds

Cathie Wood’s ARK Venture Fund holds a $69 million position in OpenAI. Among major public funds, no one else has a bigger slice of their portfolio tied to the ChatGPT maker. Inside the OpenAI position The OpenAI stake makes up roughly 5.26% to 5.41% of the fund’s net assets, depending on the snapshot date. The fund, which trades under the ticker ARKVX, managed around $1.3 billion in total assets as of mid-2026. As of August 31, 2026, SpaceX held the top spot at 7.54% of the portfolio. OpenAI came second at 5.26%, followed by Anthropic at 3.86%. Prediction market Kalshi and payments company Stripe also sit among the top holdings, based on portfolio snapshots from late August and September 2026. Private companies account for between 62% and 78% of the ARKVX portfolio, with the figure shifting by reporting date. How ARK built the bet ARK first disclosed its OpenAI investment in April 2024. At that point, the position represented roughly 4% of what was then a smaller portfolio. ARK put at least $250 million into OpenAI’s October 2024 funding round. The fund launched in September 2022 with a minimum investment of $500, opening the door to retail buyers who do not meet accredited investo...