ARK Investment Management Reduces Stake in Oklo Inc.

Hedge fund sells 33,630 shares of nuclear microreactor company

Published on Mar. 5, 2026

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ARK Investment Management LLC has reduced its stake in Oklo Inc. (NYSE: OKLO), a California-based energy technology company focused on advanced nuclear microreactors. According to a recent 13F filing, the hedge fund sold 33,630 shares of Oklo, representing a 17.7% decrease in its position. ARK Investment Management now owns 156,481 shares, or 0.11% of the company's outstanding stock.

Why it matters

Oklo is a promising player in the emerging small modular reactor (SMR) market, which aims to provide compact, factory-built nuclear power as an alternative to traditional large-scale plants. ARK Investment's decision to reduce its stake in Oklo could signal a shift in investor sentiment around the company and the broader SMR industry.

The details

In the third quarter, ARK Investment Management sold 33,630 shares of Oklo, reducing its total position to 156,481 shares. The hedge fund previously owned 0.13% of Oklo's outstanding stock. Several other institutional investors and hedge funds also made changes to their Oklo holdings during the quarter, with some increasing and others decreasing their positions.

  • ARK Investment Management made the share sale in the 3rd quarter of 2026.

The players

ARK Investment Management LLC

A prominent investment management firm that focuses on disruptive innovation and technology-driven companies.

Oklo Inc.

A California-based energy technology company specializing in the design and development of advanced nuclear microreactors.

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The takeaway

The reduction in ARK Investment's Oklo stake highlights the volatility and uncertainty surrounding the small modular reactor market, as investors weigh the potential of this emerging technology against the challenges of commercialization and regulatory hurdles. The news underscores the need for Oklo to continue executing its strategy and demonstrating the viability of its microreactor technology to maintain investor confidence.