Here is a compiled review of the largest insider buying and selling disclosed for U.S. equities on Monday. The filings span individual directors and major shareholders, as well as an institutional buyer that completed an unusually large purchase.
Top buys
AdaptHealth Corp (AHCO)
Richard Cashin, identified as a 10% owner of AdaptHealth Corp, reported two purchases that together added 447,827 shares to his holdings for roughly $4.4 million. On March 19, 2026, Cashin purchased 727 shares at per-share prices in the $9.94 to $9.95 range. The following day, March 20, 2026, he completed a far larger purchase of 447,100 shares at prices ranging from $9.81 to $9.95. After these transactions, Cashin directly and indirectly owns 16,312,698 shares of AdaptHealth Corp. At the time of the filing, AHCO traded near its 52-week high of $11.17, with the stock quoted at $10.37. InvestingPro analysis cited in the filings indicated a Fair Value estimate of $13.78 for the company.
Marketwise, Inc. (MKTW)
Frank Porter Stansberry, a director and 10% owner of Marketwise, acquired a total of 40,373 shares of Class A Common Stock across two days. On March 19, 2026, Stansberry purchased 23,103 shares with prices reported at $14.28 and a range of $13.79 to $14.74. On March 20, 2026, he added 10,000 shares at $14.78, in a range between $14.63 and $14.92, and a further 7,270 shares at $15.76, in a range from $15.02 to $16.00. The aggregated cost of these purchases was $592,286. The filing notes Marketwise trades at a price-to-earnings ratio of 6.44 and that InvestingPro analysis suggests the stock may be undervalued.
Rare Element Resources Ltd
A substantial institutional acquisition was reported for Rare Element Resources Ltd. Synchron, a subsidiary of General Atomic Technologies Corp, purchased 100,149,060 shares on March 10, 2026, in a transaction valued at $24,035,774.4. After the acquisition, Synchron directly holds 460,889,576 shares of Rare Element Resources. The filing indicates the stock was trading at $0.83, with a market capitalization of $530.49 million; the share price was up 13.7% over the prior week and 17.56% year-to-date. The filing further notes that General Atomic Technologies Corp and Tenaya Corp may be deemed to beneficially own all of the common shares held by Synchron as Synchron’s sole shareholder.
Virtus Dividend, Interest & Premium Strategy Fund
Saba Capital Management, L.P., identified as a 10% owner, purchased 28,190 shares of common stock on March 19, 2026, at $12.41 per share. The total value of the purchase was approximately $349,837. Following this transaction, Saba Capital Management, L.P. directly owns 9,897,659 shares of the fund.
Kayne Anderson Energy Infrastructure Fund, Inc. (KYN)
James C. Baker, president of the fund, reported an acquisition of 25,000 shares on March 20, 2026. The shares were purchased at $13.9857 each, for a total of $349,642. After the purchase, Baker directly owns 911,040 shares of Kayne Anderson Energy Infrastructure Fund, Inc. The filing highlights that KYN has delivered a 15% year-to-date return and trades at $13.93, with a dividend yield of 7.3%.
Top sells
GitLab Inc.
Director Matthew Jacobson reported indirect sales of Class A Common Stock executed on March 19 and March 20, 2026, with total proceeds of $26,350,369. The shares were sold at a weighted average price ranging from $22.37 to $22.95. The timing of Jacobson’s reported sale coincides with the stock trading near its 52-week low of $21.77, and the filing notes GitLab’s shares were down 54% over the past six months. InvestingPro analysis cited in the filing places GitLab’s Fair Value at $30.01, implying the stock appears undervalued at the then-current market price.
Powell Industries
Powell Thomas W, identified as a 10% owner, reported selling 49,778 shares of common stock on March 19, 2026, at $502.23 per share. The transaction generated about $25 million in proceeds. Following the sale, Powell Thomas W directly owns 598,694 shares of Powell Industries. The filings show the stock has since risen to $542.61 and had returned 181% over the past year.
Viper Energy, Inc.
Diamondback Energy, Inc. reported the sale of 510,071 shares of Viper Energy’s Class A Common Stock on March 19, 2026, according to a Form 4 filing. The shares were sold at $45.69 each for a combined value of approximately $23.3 million. The filing also indicates the stock traded at $47.32, near its 52-week high of $49.08, and was up 26% year-to-date. On the same day as the sale, Diamondback Energy also acquired 510,071 shares of Viper Energy’s Class A Common Stock, per the disclosure.
UWM Holdings Corp
Mat Ishbia, CEO, together with SFS Holding Corp, a 10% owner, reported selling 3,001,722 shares of Class A Common Stock in three separate transactions conducted between March 19 and March 23, 2026. Each tranche comprised 1,000,574 shares. The March 19 sale averaged $3.67 per share, the March 20 sale averaged $3.60 per share, and the March 23 sale averaged $3.72 per share. The combined proceeds from these transactions totaled approximately $11 million.
American Public Education Inc (APEI)
325 Capital LLC and related entities and individuals disclosed multiple sales on March 19 and March 20, 2026, which together amounted to $8,726,076. The filings list a series of transactions: 10,477 shares sold on March 19 at a weighted average price of $54.2046; 80,333 shares at $54.7908; and 4,702 shares at $55.5518. On March 20, 62,100 shares were sold at $53.7377 and 2,900 shares at $54.6035. These sales left APEI trading at $55.49 with a market capitalization of $1.02 billion, after a 150% gain over the previous year. The filing states that InvestingPro analysis assesses the stock as currently appearing overvalued relative to its Fair Value.
Context and market implications
Monday’s filings show concentrated confidence from certain insiders and large owners through sizeable purchases at AdaptHealth and Marketwise, while other insiders and large holders realized proceeds through significant sales at a range of companies. The transactions covered healthcare equipment and services, media and subscription services, energy infrastructure funds and small-cap resource plays, among others.
Tracking these filings can help market participants understand how company executives and large shareholders are positioning themselves. While insiders may sell for personal or portfolio reasons unrelated to company performance, substantial purchases by directors or 10% owners can be interpreted as a stronger signal of confidence by those individuals. The filings also included InvestingPro valuation commentary for several names, indicating where that third-party analysis views stocks as under- or overvalued relative to current prices.
Investors and analysts monitoring production rates, working capital and backlog conversion - particularly in sectors such as healthcare products and energy infrastructure - may find the timing and size of these trades useful as one input among many when evaluating cash flow outlooks and capital allocation priorities.
Note: The article summarizes insider filings and valuations disclosed in the filings. Stakeholders should consider these disclosures alongside other financial and operational indicators when assessing investment decisions.