Insider trading disclosures made public on Monday reveal a mixture of decisive purchases and large-scale sales by company executives, directors and substantial shareholders across multiple sectors. The activity spans specialty lending, financial technology, sequencing technology, insurance, semiconductors, ad tech, energy and oilfield services. Below is a company-by-company account drawn directly from the filings and recent share-price context provided alongside each transaction.
Top insider buys
Sixth Street Specialty Lending, Inc. (NASDAQ:TSLX) - The most sizeable purchase reported on Monday involved Sixth Street Specialty Lending. Vice President Alan Waxman acquired a total of 300,000 shares of common stock at an aggregate cost of $5.53 million. The purchases were executed in two tranches, with Waxman buying 100,000 shares on March 5, 2026, and 200,000 shares on March 6, 2026. Prices for the two transactions ranged narrowly from $18.42 to $18.46 per share. The shares were purchased indirectly through a trust. For context provided in the filing, the stock is trading at $18.39, and the filing notes a 22% decline over the past six months and a 15.6% decline year-to-date.
Broadridge Financial Solutions (NYSE:BR) - Broadridge's CEO, Timothy C. Gokey, reported a purchase of 5,300 shares on March 6, 2026. The transaction totaled $1,030,794, with a weighted average price of $194.4895 per share and execution prices in the range of $194.1300 to $195.1900. After the purchase, Gokey is recorded as directly owning 142,876.0271 shares of Broadridge. The filing places the share price materially below recent highs, noting the stock trades roughly 30% under its 52-week high of $271.91 and has declined 20% over the past year. The filing also references valuation metrics and company attributes, including a P/E ratio of 20.93 and a market capitalization of $22.12 billion, and notes a 19-year dividend growth streak.
Biglari Holdings Inc (NYSE:BH) - Lion Fund, L.P., which is identified as a ten percent owner of Biglari Holdings, recorded the acquisition of 3,320 shares of Class B common stock on March 9, 2026. The purchases were transacted at a weighted average price of $301.06 per share, executed in multiple trades at prices ranging from $295.32 to $308.91, for a combined cost of $999,519. The filing notes the transaction came as the stock declined 8.81% over the past week, with shares trading at $306.76, a price close to the fund's purchase level. Post-transaction ownership for The Lion Fund, L.P. is listed as 1,342,620 shares of Class B common stock and 128,811.7 shares of Class A common stock.
Quantum-Si Inc (NASDAQ:QSI) - Quantum-Si's director Charles R. Kummeth bought 500,000 shares of Class A common stock on March 5, 2026, at a weighted average price of $0.9196 per share, for a reported total of $459,800. The execution prices ranged from $0.8906 to $0.9735. Following the transaction, Kummeth is recorded as directly owning 855,000 shares of Quantum-Si. The filing highlights that the stock is trading at $0.86 and sits just 2% above its 52-week low of $0.84, with a 7.7% decline over the prior week. The disclosure also references an analysis indicating the stock appears undervalued at current levels.
Top insider sells
Slide Insurance Holdings (NASDAQ:SLDE) - Slide Insurance's Chief Executive Officer Bruce Lucas reported a series of sales totaling 532,437 shares between March 5 and March 9, 2026. The aggregated proceeds from these transactions amounted to $9.99 million. Prices across the three sales ranged from $18.23 to $19.37 per share. The filing breaks the activity down by date: on March 5, Lucas sold 172,644 shares at an average price of $19.37; on March 6, he sold 241,493 shares at an average price of $18.59; and on March 9, he sold 118,300 shares at an average of $18.23. The stock is noted as trading at $17.70, beneath its 52-week high of $25.90, while still having gained more than 31% over the past six months.
Vicor Corp (NASDAQ:VICR) - Patrizio Vinciarelli, Chairman and CEO of Vicor, sold 50,153 shares of common stock on March 5, 2026. The sales generated total proceeds of $9,341,276 and were executed at weighted average prices spanning $176.8833 to $203.0564 per share. The disclosures specify these transactions were carried out pursuant to a Rule 10b5-1 trading plan adopted by Vinciarelli on November 3, 2025. Following the sales, Vinciarelli is recorded as directly owning 9,621,663 shares of Vicor, and indirectly owning 171,125 shares held in trust. The filing also reports that the stock declined 22% over the previous week but remains up 173% over the past year.
The Trade Desk, Inc. (NASDAQ:TTD) - Director Kathryn E. Falberg sold a total of $4,655,112 in Class A common stock on March 5, 2026. The disclosed sales occurred in two transactions at prices ranging from $30.45 to $30.48 per share. The filing states that the first transaction involved the sale of 102,828 shares directly owned by Falberg at a weighted average price of $30.45, for proceeds of $3,132,141, with individual prices in that transaction between $30.25 and $30.60. After these sales, Falberg is recorded as directly owning 1,946 shares of Trade Desk. The report places the current trading price at $28.56 and notes a 56% decline in the past year. A referenced analysis in the filing suggests the company is trading below its assessed Fair Value, alongside a listed P/E ratio of 31.3 and a GOOD financial health score.
Venture Global, Inc. (VG) - Blake Sarah, Senior Vice President and Chief Accounting Officer of Venture Global, sold 330,700 shares of Class A common stock on March 5 and March 9, 2026, aggregating to approximately $3.95 million in proceeds. The sales were executed across multiple transactions and price points from $11.5665 to $13.0035 per share. The filing details the March 5 sales as 150,000 shares at a weighted average price of $11.5665; 147,100 shares at a weighted average price of $12.1164; and 2,900 shares at a weighted average price of $12.511. On March 9, 30,700 shares were sold at a weighted average price of $13.0035. The stock has experienced a 69% year-to-date increase and is noted as trading at $11.49, below recent highs.
Cactus, Inc. (NYSE:WHD) - Joel Bender, Director and President of Cactus, sold 63,963 shares of Class A common stock on March 5, 2026, at a per-share price of $50.74. The reported proceeds from the transaction were $3,245,482. Following this sale, Bender is recorded as directly owning 163,830 shares of the company. The filing includes context that the stock had posted a 27% gain over the past six months and was trading at $51.70 at the time of the report. An analysis referenced in the filing places the stock as slightly overvalued relative to an indicated Fair Value assessment.
Context and considerations
These filings illustrate a mix of concentrated insider buying and large-scale insider selling over a short window. The largest purchase reported was the $5.53 million block acquired by Sixth Street Specialty Lending's vice president, executed through a trust across two days. On the sell side, two of the largest single-insider proceeds reported were Slide Insurance's CEO at approximately $9.99 million and Vicor's CEO at $9.34 million.
Several filings include additional valuation and company-context notes. For example, the Broadridge filing references a P/E ratio and market capitalization, while disclosures tied to Quantum-Si and Trade Desk include commentary that the securities appear undervalued based on the referenced analyses. The Vicor sale is identified as occurring under a Rule 10b5-1 trading plan adopted in November 2025, an explicit procedural detail included in the Form 4 disclosure.
Monitoring insider trading activity can provide input into how executives and large shareholders are handling their positions. While purchases are often interpreted as indicating confidence and sales can reflect rebalancing or other personal or plan-driven reasons, the filings themselves do not ascribe motive beyond the transactional facts reported. Investors should treat these disclosures as one data point and consider other fundamental and technical information when evaluating securities.
Complete list of tickers mentioned in this report
- TSLX
- BR
- BH
- QSI
- SLDE
- VICR
- TTD
- VG
- WHD