Here’s a roundup of the most significant insider buying and selling activity disclosed on Tuesday for US stocks.
Top buys
saw director Simon Dingemans purchase 25,000 shares of common stock on May 1, 2026, in a transaction valued at $203,500. The shares were acquired at $8.14 each through an indirect purchase made via a spouse. The purchase comes as the stock trades near $8.05, down 36% over the past year, though InvestingPro analysis suggests the company is undervalued at current levels. Following this transaction, Mr. Dingemans indirectly holds 25,000 shares of Avantor common stock and directly holds an additional 6,225 shares.
director David MacLennan purchased 800 shares of common stock on May 4, 2026, at a price of $256.912 per share, totaling $205,529. The purchase came as the stock trades near its 52-week low of $249.04, according to InvestingPro data, though the platform’s Fair Value analysis suggests the stock may be overvalued at current levels. Following this direct purchase, Mr. MacLennan now directly holds 24,230.01 shares of Ecolab common stock. Additionally, he has indirect ownership of 3,500 shares through the Kathleen F. MacLennan Revocable Trust and 709 shares through sibling’s trusts.
Chief Accounting Officer Scott A. Phillips increased his holdings through a purchase of depositary shares on May 4, 2026. Mr. Phillips acquired 5,000 depositary shares for a total value of $129,507, with shares purchased at $25.9015 each. Each depositary share represents a 1/40th interest in a share of the issuer’s 8.25% Fixed-Rate Non-Cumulative Perpetual Preferred Stock, Series B. The insider buy comes as the stock trades at $26.56, up 27% over the past year, and appears undervalued according to InvestingPro analysis.
Top sells
executive chairman Martin E. Stein Jr. disposed of 274,615 shares of common stock for a total value of approximately $21.5 million on May 4, 2026. The sales occurred at prices ranging from $78.175 to $78.69 per share, according to a regulatory filing. The transactions involved three separate indirect sales of common stock and came as the stock trades near its 52-week high of $81.66, with shares currently at $78.88. According to InvestingPro analysis, the stock appears overvalued at current levels.
President and Chief Executive Officer Sanjay Mehrotra sold a total of 39,995 shares of common stock on May 1, 2026, according to a SEC Form 4 filing. The transactions amounted to a total value of $21,450,554, with shares sold in multiple transactions at prices ranging from $511.91 to $545.39 per share. The stock has since surged to $640.20, reflecting a remarkable 698% return over the past year. These sales were executed pursuant to a Rule 10b5-1 trading plan, which was adopted by Mr. Mehrotra on January 30, 2026. According to InvestingPro analysis, Micron currently trades above its Fair Value and appears on the Most Overvalued stocks list.
President and CEO Richard Adam Norwitt sold shares worth approximately $18.7 million in a series of transactions between May 1 and May 5, 2026. The sales involved a total of 130,775 shares of Amphenol’s Class A Common Stock at prices ranging from $142.0416 to $143.8951 per share. Specifically, on May 1, Norwitt sold 61,072 shares at a weighted average price of $143.8951, with individual trades occurring between $143.50 and $146.30. On May 4, 52,203 shares were sold at a weighted average price of $142.0416, with trades ranging from $142.00 to $142.1351. The final sale on May 5 involved 17,500 shares at a weighted average price of $143.2061, with trades between $143.1550 and $143.2514. The insider sale comes as the stock has delivered a 71.7% return over the past year, though InvestingPro analysis indicates the company is currently overvalued relative to its Fair Value.
director Martin Tuchman reported the sale of ordinary shares totaling $61,534,493 over several days in early May 2026. According to a Form 4 filing with the Securities and Exchange Commission on May 5, 2026, Mr. Tuchman disposed of a total of 254,260 ordinary shares, with individual sale prices ranging from $238.27 to $245.66 per share. The stock currently trades at $244.20, reflecting a remarkable 145% return over the past year and a 13% gain in just the last week.
saw and its controlling stockholder, Warren E. Buffett, report the sale of a significant block of common stock on May 1, 2026. The transaction involved the disposition of 1,220,376 shares, totaling approximately $182.8 million, with shares sold at a price of $149.8429 per share. Following this transaction, Berkshire Hathaway and Mr. Buffett collectively hold 28,880,209 shares of DaVita common stock. The stock has since climbed to $157.04, trading near its 52-week high of $159.42, with shares up roughly 30% over the past six months.
Monitoring insider trading activity can provide valuable insights into how company executives and major shareholders view their stock’s prospects. While insider purchases may signal confidence in a company’s future performance, and sales might indicate various factors including portfolio rebalancing or personal financial needs, these transactions should be considered alongside other fundamental and technical analysis when making investment decisions.
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