Here’s a summary of the most significant insider transactions disclosed on Wednesday, January 14, 2026.
Top Buys
Berkley W R Corp (NYSE:WRB) saw substantial insider buying from ten percent owner Mitsui Sumitomo Insurance Co. Ltd., which reported purchasing shares of common stock across multiple transactions between January 12 and January 14, 2026. The total value of these purchases amounted to $55.6 million. The purchases were executed at prices ranging from $67.82 to $69.23. On January 12, 256,041 shares were acquired at a weighted average price of $68.73. On January 13, two separate transactions occurred: 118,501 shares at a weighted average price of $67.82, and 206,499 shares at $68.15. The buying continued on January 14, with 21,728 shares purchased at $68.80, and 208,272 shares at $69.23.
Aktis Oncology, Inc. (NASDAQ:AKTS) reported multiple significant insider purchases on January 12, 2026. Director Todd Foley purchased 232,870 shares at $18 per share, for a total transaction value of $4.19 million. AKTS currently trades at $20.67, representing a 14.8% premium to Foley’s purchase price. On the same day, Foley also acquired 4,235,403 shares indirectly through the conversion of Series Seed, Series A, and Series B Redeemable Convertible Preferred Stock at a price of $0.
Aktis Oncology, Inc. (NASDAQ:AKTS) also saw MPM Funds purchase 1,112,777 shares at $18.00 per share on January 12, for a total transaction value of $20.03 million. The purchase was made at a 15% discount to the current trading price of $20.67. On the same date, MPM Funds converted various series of Redeemable Convertible Preferred Stock into common stock, resulting in 1,314,262 shares from Series Seed, 5,914,197 shares from Series A, and 1,577,119 shares from Series B conversions.
Aktis Oncology, Inc. (NASDAQ:AKTS) had additional insider activity from Ansbert Gadicke, MPM Asset Management LLC, and Oncology Impact Private Investment Fund 2, L.P., all listed as 10% owners. They reported purchasing 1,112,777 shares at $18 per share, totaling $20.03 million. This purchase occurred at a 13% discount to the current trading price. The same insiders also reported converting preferred stock into common stock on the same date.
Top Sells
CoreWeave, Inc. (CRWV) Chief Development Officer Brannin McBee sold 76,338 shares of Class A Common Stock on January 12, 2026, for approximately $9.3 million. The sales occurred at weighted average prices ranging from $78.54 to $91.87 per share. The transactions were executed under a pre-arranged Rule 10b5-1 trading plan adopted on September 2, 2025.
Jefferson Capital, Inc. (NASDAQ:JCAP) saw CEO and President David M. Burton sell 385,000 shares of common stock on January 9, 2026, at a price of $20.50, for a total transaction value of $7.89 million. The sale was to underwriters in the company’s Secondary Offering. Following the transaction, Burton directly owns 3,392,500 shares of Jefferson Capital.
McCormick & Co (NYSE:MKC) ten percent owner Lawrence Erik Kurzius sold 50,000 shares of common stock on January 13, 2026, at a price of $67.43, totaling $3.37 million. According to the SEC filing, Kurzius also exercised options to acquire 50,000 shares at a price of $49.96 per share, for a total value of $2.50 million. Following these transactions, Kurzius directly owns 246,762 shares of the company.
Roku (NASDAQ:ROKU) CEO Anthony J. Wood sold 77,599 shares of Class A Common Stock on January 12, 2026, for a total of $8.22 million. The sales were executed at prices ranging from $107.51 to $114.98, near the stock’s 52-week high of $116.66. Wood, who is also the Chairman of the Board and a ten-percent owner, sold the shares indirectly through the Wood 2017 Revocable Trust under a pre-arranged 10b5-1 trading plan.
IPG Photonics CORP (NASDAQ:IPGP) ten percent owner Valentin Gapontsev Trust I sold 45,348 shares of common stock between January 12 and January 14, 2026, for approximately $4.5 million. The sales occurred at prices ranging from $76.20 to $78.55 per share. On January 12, the trust sold 16,065 shares at a weighted average price of $76.20, totaling $1.22 million, and an additional 1,928 shares at a weighted average price of $76.69, totaling $147,885.
Why Monitor Insider Activity
Tracking insider transactions provides valuable insights into how a company’s executives, directors, and major shareholders view their own company’s prospects. When insiders buy shares with their own money, it often signals confidence in the company’s future performance. Conversely, insider selling might indicate concerns about upcoming challenges or simply personal financial planning. While no single transaction should drive investment decisions, consistent patterns of insider activity can complement your research and help identify potential investment opportunities or warning signs that might otherwise go unnoticed.
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