RadNet Shares Sold by Portolan Capital Management

Institutional investor reduces stake in medical imaging company

Mar. 14, 2026 at 9:05am

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Portolan Capital Management LLC, an institutional investor, lowered its stake in RadNet, Inc. (NASDAQ:RDNT) by 33.6% during the third quarter, according to a recent SEC filing. The firm now owns 226,669 shares of the medical research company's stock, down from 341,355 shares previously.

Why it matters

RadNet is a leading independent provider of outpatient diagnostic imaging services in the United States, operating a nationwide network of imaging centers. The reduction in Portolan Capital's stake could signal a shift in investor sentiment around the company's performance or future prospects.

The details

According to the 13F filing, Portolan Capital Management sold 114,686 shares of RadNet during the third quarter. The firm now owns 0.29% of RadNet, down from 0.44% previously. RadNet's stock price has fluctuated in recent months, trading between $45 and $85 per share over the past 52 weeks.

  • Portolan Capital Management reduced its RadNet stake during the third quarter of 2025.

The players

Portolan Capital Management LLC

An institutional investment firm that previously held a sizable stake in medical imaging company RadNet, Inc.

RadNet, Inc.

A leading independent provider of outpatient diagnostic imaging services in the United States, operating a nationwide network of imaging centers.

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The takeaway

The reduction in Portolan Capital's RadNet stake could signal a shift in investor sentiment around the company's performance or future prospects, though the reasons behind the move are not entirely clear from the available information. As a major institutional investor, Portolan's actions are worth monitoring as they may provide insights into the broader market's view of RadNet's business.