Harbor Capital Sells Almost $20 Million of RadNet (RDNT) Shares

Harbor Capital Advisors disclosed the sale of over 300,000 shares of RadNet (NASDAQ:RDNT) in Q3 2025. The trade was worth an estimated $19.74 million.

What happened

According to a filing with the Securities and Exchange Commission dated October 15, 2025, Harbor Capital Advisors reduced its position in RadNet by 304,051 shares in Q3 2025. The estimated trade value, based on the average Q3 closing price, was $19.74 million. After the sale, the fund held 124,390 shares, worth $9.48 million at quarter-end.

What else to know

Harbor Capital reduced its RadNet allocation from 1.02% of its 13F assets under management (AUM) to 0.74%. The fund reported total U.S. equity AUM of $1.29 billion across 1,339 positions.

Here are its top holdings after the filing:

• iShares Core S&P 500 ETF (NYSEMKT:IVV): $49.15 million (3.82% of AUM)
• iShares Msci Emerging Markets ETF (NYSEMKT:EEM): $38.43 million (2.99% of AUM)
• iShares Msci Eafe ETF (NYSEMKT:EFA): $28.28 million (2.20% of AUM)
• Nvidia (NASDAQ:NVDA): $27.22 million (2.12% of AUM)
• Alphabet (NASDAQ:GOOGL): $26.54 million (2.06% of AUM)

As of October 14, 2025, shares of RadNet were priced at $73.81, up 4.52% year-on-year. It underperformed the S&P 500 by 6.63 percentage points over the same period.

Company Overview

Data correct as of market close, October 14, 2025.

Company Snapshot

RadNet offers outpatient diagnostic imaging services such as MRI, CT, PET scans, mammography, ultrasound, and related procedures. The company also provides AI-driven imaging software and IT solutions for medical diagnostics.

It generates revenue primarily through patient imaging services and technology solutions sold to healthcare providers. It leverages a network of owned and managed imaging centers across multiple U.S. states.

The company combines a broad portfolio of imaging modalities with proprietary AI and IT solutions to support clinical decision-making and operational efficiency.

Foolish take

RadNet shares soared over 30% to over $70 in August on the back of positive Q2 earnings results. Depending on which month Harbor Capital made its sale, the move could be down to profit-taking. SEC filings show the investment firm originally bought RadNet in Q2 2024, when the average share price was $54.28.

But that's only part of the story. Harbor Capital's filings also show the firm dramatically increased its holdings in two international ETFs. As of the end of Q3, 2025, it held $38.43 million in the iShares MSCI Emerging Markets ETF, up from $6.16 million in Q2. It also increased its position in the iShares MSCI EAFE ETF from $1.87 million to $28.28 million. The fund focuses on large and mid-cap companies outside the U.S.

Those holdings are now its second and third largest positions, making up over 5% of its AUM. It looks like the firm is diversifying globally. This fits with a broader trend of investors who want to balance their U.S. shareholdings, whether that's because of a weak dollar, concentration fears, or uncertainty concerns.

Glossary

13F: A quarterly SEC filing required from institutional investment managers to disclose U.S. equity holdings.

Assets Under Management (AUM): The total market value of investments managed by a fund or financial institution.

Quarterly filing: A report submitted every three months to regulators, updating on holdings, trades, or financial status.

Stake: The amount or percentage of ownership an investor or fund holds in a particular company.

Outpatient diagnostic imaging: Medical imaging procedures performed without hospital admission, such as MRI, CT, or ultrasound scans.

Imaging modalities: Different types of medical imaging technologies, such as MRI, CT, PET, and ultrasound.

AI-driven imaging software: Artificial intelligence tools used to analyze medical images and assist in diagnostic processes.

Proprietary IT solutions: Custom-developed technology systems owned by a company, used to improve operations or services.

Managed imaging centers: Medical imaging facilities operated or overseen by a company, but not necessarily owned by it.

TTM: The 12-month period ending with the most recent quarterly report.

Fund holdings: The individual securities or assets owned by an investment fund.

Trade value: The total dollar amount of a transaction, calculated by multiplying the number of shares by the price per share.

Emma Newbery has positions in Nvidia. The Motley Fool has positions in and recommends Alphabet and Nvidia. The Motley Fool has a disclosure policy.