Here’s a roundup of the most significant insider trading activity disclosed on Tuesday for US-listed companies.
Top insider buys
Hallador Energy Co saw Director Daniel Timothy Hudson acquire 10,000 shares of the company’s common stock on June 29, 2026, for a total value of $169,400. The shares were purchased in multiple transactions, with prices ranging from $16.90 to $16.98 per share. Following these acquisitions, Mr. Hudson directly owns a total of 15,000 shares of Hallador Energy common stock. The stock currently trades at $17.39, representing a modest gain from his purchase prices, and InvestingPro analysis suggests the company remains undervalued relative to its Fair Value. The $797.92 million market cap company holds more cash than debt on its balance sheet, according to InvestingPro, which offers 9 additional ProTips for subscribers.
received a vote of confidence from Mink Brook Asset Management LLC, a 10% owner of the company, which recently increased its stake through several purchases of common stock. The transactions, which occurred on June 29 and June 30, 2026, totaled 5,183 shares for an aggregate value of $27,207. The shares were acquired at prices ranging from $5.24 to $5.25 per share. These prices represent weighted averages across multiple transactions on each respective date. The purchases came as the stock trades near its 52-week low of $5.12, with shares down approximately 9% over the past year. The company currently carries a market capitalization of $77.68 million.
Total Return Securities Fund saw director Moritz A. Sell recently increase his holdings in the company through open market purchases totaling $24,155. According to a Form 4 filing with the Securities and Exchange Commission, Mr. Sell acquired shares across two separate transactions. On June 26, 2026, he purchased 2,091 shares, and on June 29, 2026, an additional 2,000 shares were acquired. The prices paid for these shares ranged from $5.885 to $5.925 per share.
Capital Southwest Corp director Ramona Lynn Rogers-Windsor acquired shares of the company’s common stock, according to a recent SEC filing. The transaction, which took place on June 30, 2026, involved the purchase of 210.9615 shares. The shares were bought at a price of $23.701 per share, totaling approximately $4,999 for the transaction. The purchase came as the stock trades near its 52-week high of $24.43, with shares currently at $23.77. The company offers a dividend yield of 14.18%, according to InvestingPro data, which provides 9 additional ProTips for investors. Following this acquisition, Ms. Rogers-Windsor directly holds 23,090.6758 shares of Capital Southwest Corp common stock.
Central Securities Corp CEO and President John C. Hill acquired company common stock totaling $12,085 on June 26, 2026, according to a recent filing with the Securities and Exchange Commission. Mr. Hill purchased a total of 233 shares of Central Securities common stock at a price of $51.87 per share. These acquisitions included 228 shares bought directly, increasing his direct holdings to 77,601 shares. An additional 5 shares were acquired indirectly through his children, bringing the total indirect ownership in that category to 906 shares. The stock currently trades at $52.51 with a P/E ratio of 5.85. According to InvestingPro Tips, Central Securities has maintained dividend payments for 54 consecutive years, with a current yield of 1.19%. The platform offers 5 additional exclusive tips for investors.
Top insider sells
experienced significant selling activity as WindAcre Partnership LLC, a 10% owner, sold ordinary shares totaling approximately $195.6 million between June 26 and June 30, 2026. The transactions involved the sale of 5,706,579 ordinary shares at prices ranging from $33.00 to $36.25 per share. Following these sales, WindAcre Partnership LLC directly owns 16,148,621 ordinary shares of Perimeter Solutions. The stock currently trades at $35.65, near its 52-week high of $38.17, following a remarkable 156% gain over the past year. According to InvestingPro analysis, the company appears overvalued at current levels—placing it among stocks on the Most Overvalued list. Investors can access 10 additional ProTips and a comprehensive Pro Research Report for deeper insights into PRM’s valuation.
President and CEO Sanjay Mehrotra sold common stock totaling $32,761,315 on June 26, 2026. The transactions involved the sale of 26,736 shares of Micron Technology common stock. The prices for these sales ranged from $1,128.41 to $1,169.96 per share. These sales were executed pursuant to a Rule 10b5-1 trading plan, which Mr. Mehrotra adopted on January 30, 2026. The sales come as Micron shares trade at $1,153, near their 52-week high of $1,255, following an extraordinary 839% gain over the past year.
Kymera Therapeutics, Inc director Bruce Booth reported selling 500,000 shares of the company’s common stock for a total value of $56,460,136. The transactions took place on June 26 and June 29, 2026, with prices per share ranging from $105.78 to $118.66. The sales come as shares trade at $114.69, up 150% over the past year, though InvestingPro analysis suggests the stock is currently overvalued relative to its Fair Value. The sales were executed pursuant to a Rule 10b5-1 trading plan, which was adopted on December 11, 2025. The shares were held indirectly by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. Mr. Booth is a member of the general partners of these funds and disclaims beneficial ownership of the securities held by them, except to the extent of his pecuniary interest.
Co-Chief Executive Officer and director AmirAli Talasaz sold common stock totaling approximately $39.3 million and acquired shares through option exercises valued at about $1.1 million between June 26 and June 29, 2026. The sales involved a total of 260,000 shares of Guardant Health common stock. These shares were sold across multiple transactions at prices ranging from $150.4886 to $153.0 per share, near the stock’s 52-week high of $153.95. The timing follows a remarkable 195% return over the past year, according to InvestingPro data. The platform’s Fair Value analysis suggests the stock is currently overvalued at these levels. All sold shares were held indirectly by the Talasaz and Eskandari 2017 Family Trust.
director Mario Schlosser sold Class A common stock totaling approximately $30.18 million on June 23, 2026. These transactions were executed under a Rule 10b5-1 trading plan, which allows insiders to set up predetermined plans to buy or sell company stock. The sales involved a total of 1,027,490 shares of Class A common stock. Prices for the shares sold ranged from $28.08 to $30.09 per share. The stock currently trades at $28.46, near its 52-week high of $30.66, following a remarkable 105% surge over the past six months. The transactions included both direct holdings and shares held indirectly through family trusts. According to InvestingPro analysis, Oscar Health’s stock has demonstrated strong returns recently, though it remains quite volatile with a beta of 2.39. The platform’s Fair Value analysis suggests the stock is trading near fair value. Investors seeking deeper insights can access Oscar Health’s comprehensive Pro Research Report, one of 1,400+ available reports that transform complex Wall Street data into clear, actionable intelligence.
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 suggest concerns or simply portfolio diversification, these transactions should be considered alongside other fundamental and technical factors when making investment decisions. Insiders have access to non-public information about their companies’ operations and prospects, making their trading patterns worth watching as part of a comprehensive investment research process.
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