William Blair Investment Management Reduces Stake in Lumentum Holdings

The institutional investor sold over 85,000 shares of the technology company in the 3rd quarter.

Published on Mar. 2, 2026

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William Blair Investment Management LLC reduced its stake in Lumentum Holdings Inc. (NASDAQ:LITE) by 23.8% in the 3rd quarter, according to the company's disclosure with the Securities and Exchange Commission. The institutional investor now owns 274,124 shares of the technology company's stock, valued at $44.6 million.

Why it matters

Lumentum is a leading provider of photonic technologies for high-speed optical communication networks and industrial applications. As a major institutional investor, William Blair's stake reduction could signal a shift in market sentiment or portfolio rebalancing, which could impact Lumentum's stock performance.

The details

According to the filing, William Blair Investment Management sold 85,574 shares of Lumentum stock during the 3rd quarter, reducing its total position to 274,124 shares. The firm now owns 0.39% of Lumentum's outstanding shares.

  • The stake reduction occurred in the 3rd quarter of the year.

The players

William Blair Investment Management LLC

An institutional investment management firm that reduced its stake in Lumentum Holdings Inc.

Lumentum Holdings Inc.

A leading provider of photonic technologies for high-speed optical communication networks and industrial applications.

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The takeaway

This filing highlights the shifting investment landscape around Lumentum, a key player in the optical networking and industrial technology sectors. Investors will likely monitor William Blair's future moves and other institutional activity around Lumentum to gauge market sentiment and potential impacts on the company's stock performance.