William Blair Investment Management Trims MGIC Investment Stake

Investment firm reduces holdings in mortgage insurance provider by 44.5% in Q3

Published on Mar. 3, 2026

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William Blair Investment Management LLC reduced its stake in MGIC Investment Corporation (NYSE:MTG) by 44.5% in the third quarter, according to a recent SEC filing. The firm now owns 515,948 shares of the insurance provider's stock, down from 929,897 shares previously.

Why it matters

MGIC Investment is a leading provider of private mortgage insurance in the U.S., helping lenders manage credit risk and facilitate homeownership. Changes in major institutional investors' holdings can signal shifts in market sentiment around the company and the broader mortgage insurance industry.

The details

According to the SEC filing, William Blair Investment Management sold 413,949 shares of MGIC Investment during the third quarter. The firm now owns approximately 0.23% of the company's outstanding stock, valued at $14.6 million as of the most recent reporting period.

  • The filing covers the third quarter of 2026.

The players

William Blair Investment Management LLC

An investment management firm that has reduced its stake in MGIC Investment Corporation.

MGIC Investment Corporation

A leading provider of private mortgage insurance in the United States.

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The takeaway

The reduction in William Blair's MGIC Investment holdings suggests the investment firm may have a more cautious outlook on the mortgage insurance provider and the broader industry. However, MGIC Investment remains a major player in its market, and changes in institutional ownership do not necessarily indicate fundamental issues with the company's performance or prospects.