PDF Solutions Sees 13.7% Increase in Shares Owned by William Blair Investment Management

The investment firm now owns about 3.42% of the technology company's stock.

Published on Mar. 2, 2026

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According to a recent SEC filing, William Blair Investment Management LLC increased its holdings in PDF Solutions, Inc. (NASDAQ:PDFS) by 13.7% in the 3rd quarter. The firm now owns 1,349,441 shares of the technology company's stock, worth approximately $34.8 million and representing about 3.42% of PDF Solutions' total shares outstanding.

Why it matters

This increase in ownership by a major institutional investor like William Blair Investment Management suggests growing confidence in PDF Solutions' business and future prospects. As a leading provider of data-driven solutions for the semiconductor manufacturing industry, PDF Solutions' technology and services are increasingly in demand as chipmakers look to improve yield, productivity and profitability.

The details

William Blair Investment Management LLC added 162,358 shares of PDF Solutions during the 3rd quarter, bringing its total stake in the company to 1,349,441 shares. This represents about 3.42% of PDF Solutions' total shares outstanding. The investment firm cited the technology company's strong market position and growth potential as reasons for increasing its position.

  • William Blair Investment Management LLC filed its 13F report for the 3rd quarter of 2026 on March 2, 2026.

The players

William Blair Investment Management LLC

An investment management firm that oversees over $100 billion in assets for institutional and individual clients worldwide.

PDF Solutions, Inc.

A technology company that provides data-driven solutions for the semiconductor manufacturing industry, helping chipmakers improve yield, productivity and profitability.

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The takeaway

The increased stake by William Blair Investment Management in PDF Solutions reflects growing confidence in the company's technology and market position within the semiconductor industry. As chipmakers continue to face pressure to optimize manufacturing processes, PDF Solutions' data-driven solutions are likely to see increasing demand, driving further growth for the company.