Mad River Investors has disclosed its third-quarter holdings in a recent filing, revealing a total investment value of approximately $245.7 million as of September 30, 2026. This update is significant as it showcases the firm’s strategic investments in some of the largest companies in the market, including Apple Inc. and Amazon.com Inc.

The filing, submitted on October 27, 2026, highlights the firm’s commitment to maintaining a diversified portfolio within the financial sector. The report includes a total of 31 different holdings, signaling a well-rounded approach to investment management.

Background

Mad River Investors, based in Boston, Massachusetts, is an investment management firm incorporated in Delaware. The company is identified under the Central Index Key (CIK) 0001384484. Its recent filings include multiple 13F-HR forms, with the latest being filed on October 27, 2026.

What the Filing Says

The filing outlines the firm’s holdings, with a total value of $245,689,091. Notable investments include:

"Apple Inc. - $1,947,168 (5,847 shares)"
"Amazon.com Inc. - $847,110 (3,400 shares)"

These figures reflect Mad River's investment discretion, indicating a sole authority over these investments.

Impact

This update may affect various stakeholders, including clients, competitors, and market analysts. Clients may find reassurance in the firm's strategic choices, while competitors may analyze Mad River's investments to gauge market trends and shifts in investment strategies.

What's Next

The filing does not say what happens next.