Tuesday’s Insider Activity: Top Buys and Sells in US Stocks

This article summarizes the most significant insider buying and selling activities reported for US stocks on Tuesday, October 21, 2025.

Top Buys:

Rocky Mountain Chocolate Factory, Inc. (NASDAQ:RMCF) saw its Interim CEO, Jeffrey Richart Geygan, purchase shares in two transactions. Geygan, through Global Value Investment Corporation, acquired a total of 75,423 shares at prices ranging from $1.5869 to $1.607. The total value of these purchases amounted to $119,965, representing nearly 1% of the company’s $12.6 million market capitalization. This insider buying comes as the stock trades near $1.64, having declined over 32% year-to-date.

DENNY’S Corp (NASDAQ:DENN) reported significant insider buying from Jumana Capital Investments LLC and Christopher R. Martin. The entity purchased a total of 183,307 shares valued at $925,480 in multiple transactions between October 17 and October 21, 2025. The buying prices ranged from $4.9929 to $5.1416. Following these transactions, Jumana Capital Investments LLC directly owns 3,804,870 shares of Denny’s common stock. This insider activity comes as the stock has gained over 53% in the past six months.

Cullinan Therapeutics, Inc. (NASDAQ:CGEM) saw substantial insider buying from Lynx1 Capital Management LP, a ten percent owner of the company. The firm acquired a total of 248,749 shares worth $2,103,912 in a series of transactions between October 14 and October 17, 2025. The purchases were made at prices ranging from $7.50 to $9.22 per share.

CSX (NYSE:CSX) President and CEO Stephen F. Angel acquired 55,000 shares of the company’s common stock on October 20, 2025. The shares were purchased at a weighted average price ranging from $36.80 to $36.94, for a total transaction value of $2.03 million. This insider buying comes as CSX stock trades near its 52-week high of $37.25, following a 34% surge over the past six months.

BRT Apartments Corp (EXCHANGE:BRT) reported insider buying from its President and CEO, Jeffrey Gould. Gould purchased 7,000 shares at a weighted average price of $14.9612, for a total transaction value of $104,728. Following the transaction, Gould’s indirectly held shares through Gould Investors L.P. amounted to 4,074,353.3592.

Top Sells:

Grindr Inc. (NASDAQ:GRND) Director Lu James Fu Bin sold 250,000 shares on October 17, 2025. The shares were sold at a weighted average price of $13.13, for a total transaction value of $3.28 million. Following the transaction, Lu James Fu Bin, through Longview Grindr Holdings Limited, still owns 23,888,867 shares of Grindr Inc.

Arista Networks Inc (NASDAQ:ANET) President and CTO Kenneth Duda sold 30,000 shares of common stock on October 17, 2025. The sales were executed at weighted average prices ranging from $140.0367 to $143.7229, resulting in proceeds of approximately $4.28 million. Duda also exercised options to acquire 30,000 shares at a price of $3.515 per share.

Micron Technology Inc (NASDAQ:MU) Chief Accounting Officer Allen Scott R. sold 8,800 shares of company stock on October 20, 2025, for approximately $1.85 million. The shares were sold at prices ranging from $210.00 to $210.08, near the stock’s 52-week high of $206.34.

TransDigm Group INC (NYSE:TDG) Co-Chief Operating Officer Joel Reiss sold 2,906 shares of common stock on October 20, 2025, for a total of $3.8 million. The sales were executed at prices ranging from $1272.5781 to $1283.99. Reiss also exercised stock options for 3,000 shares at a price of $284.97.

Cencora, Inc. (NYSE:COR) President and CEO Robert P. Mauch sold 5,097 shares of common stock on October 20, 2025, for $1.66 million. The shares were sold at a price of $326.80, near the stock’s 52-week high of $325.70.

Investors should stay tuned to insider buying and selling activities as they can provide valuable insights into a company’s prospects. While insider transactions alone should not be used as the sole basis for investment decisions, they can offer important context when combined with other fundamental and technical analysis. Insiders may have unique knowledge about their company’s operations and outlook, making their trading activities potentially significant indicators for other investors to consider.

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