Here is a detailed account of the most material insider purchases and disposals reported for Wednesday, May 20, 2026. The transactions covered in this roundup span several sectors and include acquisitions executed by affiliated investment vehicles, purchases by corporate officers, and large block sales by controlling stakeholders and company executives. Where available, weighted average prices, transaction ranges, holding structures and regulatory mechanisms such as Rule 10b5-1 plans and sell-to-cover tax-withholding elections are reported as disclosed in the filings.
Top insider buys
Casdin Partners Master Fund, L.P. - GeneDx Holdings Corp. (NASDAQ: WGS)
An investment fund tied to Eli Casdin, who serves as a director and owns a 10 percent stake in GeneDx Holdings Corp., purchased approximately 500,000 shares of the company’s Class A Common Stock over three trading days from May 18 through May 20, 2026. The cumulative value of these purchases was reported as $21,459,735.
The breakdown of the purchases is as follows:
- May 18, 2026 - 175,000 shares purchased at a weighted average price of $42.5517 per share; transaction prices ranged from $42.4573 to $42.9153.
- May 19, 2026 - 185,000 shares purchased at a weighted average price of $42.5964 per share; individual transaction prices ranged from $42.1118 to $42.6898.
- May 20, 2026 - 140,000 shares purchased at a weighted average price of $43.8061 per share; prices on these transactions ranged from $43.6287 to $44.3384.
The disclosures accompany a stock that has exhibited substantial volatility, having fallen 66 percent over the prior six months while gaining 15 percent in the most recent week. According to the InvestingPro analysis referenced in the filings, the share price is trading near its Fair Value and the company’s market capitalization stands at $1.33 billion.
Edward P. Garden - Fortune Brands Innovations (FBIN)
Edward P. Garden, a director at Fortune Brands Innovations, acquired common stock with an aggregate value of approximately $13.66 million in transactions on May 19 and May 20, 2026. The reported per-share prices ranged from $33.28 to $33.40.
Specifically, on May 19, entities associated with Mr. Garden purchased 403,000 shares at a weighted average price of $33.40 per share; those trades reflected individual prices between $32.34 and $33.83. On May 20, an additional 5,900 shares were acquired at a weighted average of $33.28 per share, with prices ranging from $33.14 to $33.64. The acquired shares were held indirectly by GI SPV II L.P. and Green 73 LLC.
The timing of these purchases is notable in light of the stock trading near a 52-week low of $32.34 and a roughly 30 percent year-to-date decline, as indicated in the disclosures.
Bob R Simpson - TXO Partners, L.P. (NYSE: TXO)
Bob R Simpson, who is a director and holds a 10 percent interest in TXO Partners, L.P., reported direct purchases of common units totaling approximately $1.97 million. These transactions were filed on Form 4 with the Securities and Exchange Commission and involved 148,403 common units bought over two days.
On May 18, 2026, Mr. Simpson, who also serves as Chairman of TXO GP, LLC - the general partner of TXO Partners - purchased 58,251 common units at prices ranging from $12.86 to $13.50 per unit. The weighted average purchase price across those units was $13.1687.
Michael Rosenthal - MP Materials Corp. (NYSE: MP)
Michael Rosenthal, the Chief Operating Officer of MP Materials, purchased 17,000 shares of the company’s common stock on May 20, 2026, for a total of $962,540. The per-share price of that purchase was $56.62. Following the transaction Rosenthal directly holds 1,333,673 shares of MP Materials common stock, with an additional 126,622 shares held indirectly through the Rosenthal Family Trust.
The filings note the share price context at the time of the purchase; the stock is trading at $56.47, and the InvestingPro commentary cited in the disclosure concludes the company appears overvalued versus its Fair Value estimate and is listed among stocks considered Most Overvalued in that analysis. The filing points interested investors toward MP Materials’ Pro Research Report for further detail.
Top insider sells
Maximilian Viessmann - Carrier Global Corp (NASDAQ: CARR)
Maximilian Viessmann, a director and the controlling stakeholder through related entities, sold a block of Carrier common stock on May 20, 2026. The disposition consisted of 12,094,823 shares at a price of $62.01 per share, with the total value of the sale reported as approximately $749,999,974.
Post-transaction, Mr. Viessmann continues to indirectly hold 37,979,286 shares of Carrier common stock. The filings describe both the shares sold and those retained as held by Viessmann Traeger HoldCo GmbH, a wholly owned subsidiary of Viessmann Generations Group GmbH & Co. KG. The disclosures identify Mr. Viessmann as President and Chief Executive Officer and the controlling stockholder of the sole general partner and sole managing limited partner of Viessmann Group KG, and thus as beneficially owning the reported holdings.
Mohan Jitendra - Astera Labs, Inc. (NASDAQ: ALAB)
Mohan Jitendra, Chief Executive Officer of Astera Labs, sold 142,071 shares of the company’s common stock across multiple transactions on May 18 and May 19, 2026, aggregating to approximately $31,295,011. The sales executed at prices ranging from $210.6728 to $250.0005 per share. The filings state these dispositions were executed automatically under a Rule 10b5-1 trading plan that Mr. Jitendra adopted on December 1, 2025.
The disclosures further note that ALAB shares have been trading near their 52-week high of $287.70, and the stock has risen 204 percent over the prior year. InvestingPro’s analysis referenced in the filings assesses the shares as appearing overvalued relative to Fair Value estimates.
Brian M Venturo - CoreWeave, Inc. (NASDAQ: CRWV)
Brian M Venturo, Chief Strategy Officer at CoreWeave, reported sales of 375,000 shares of Class A Common Stock on May 18, 2026. The transactions, executed via a pre-arranged Rule 10b5-1 trading plan adopted on November 13, 2025, produced total proceeds of $37,966,422. Reported weighted average prices on the transactions ranged from $99.3736 to $103.8501 per share.
Of the shares sold, 300,000 were sold indirectly through West Clay Capital LLC, where Mr. Venturo serves as managing member. The remaining 75,000 shares were sold indirectly through the Venturo Family GST Exempt Trust, for which his spouse is a trustee and the couple’s minor children are beneficiaries.
Sanjay Gajendra and Jitendra Mohan - Astera Labs, Inc. (NASDAQ: ALAB)
The filings disclose additional Astera Labs activity tied to tax-withholding requirements for vested restricted stock units. Sanjay Gajendra, the company’s President and COO, sold 93,398 shares on May 18, 2026, in multiple transactions at prices ranging from $216.46 to $235.41 per share, totaling about $21,476,948. These sales were not discretionary; they were carried out to satisfy tax withholding obligations related to the vesting and settlement of previously granted restricted stock units. The sell-to-cover mechanism was described as automatic, following an election by Astera Labs made prior to the vesting event.
Similarly, Jitendra Mohan, listed as Chief Executive Officer in other disclosures, sold 93,444 shares on May 18, 2026, for approximately $21.48 million. Those sales were also reported as automatic sell-to-cover transactions required to meet tax-withholding obligations on vested restricted stock units, with sale prices reported in the $216.46 to $235.41 range.
The filings note ALAB’s share price context at that time - trading near $287.40 and close to a 52-week high of $287.70, and showing a one-year return of 212 percent in the filings' data. InvestingPro analysis cited in the disclosure classifies the stock as appearing overvalued at current levels based on Fair Value estimates.
Context and considerations
The filings in this roundup include a mix of direct purchases by insiders, acquisitions by affiliated funds and entities, pre-arranged trading plans under Rule 10b5-1, and automated sell-to-cover transactions tied to tax-withholding on RSU vesting. The regulatory and structural mechanisms referenced in the filings shape how these transactions are executed and whether they represent discretionary trading decisions.
Insider purchases can be interpreted by some market participants as a sign of confidence, while insider sales - particularly large block disposals - can attract scrutiny. However, the regulatory disclosures here make clear that not all sales are discretionary. Several large sales reported were automatic under pre-set plans or for tax-withholding purposes, and therefore did not reflect on-the-spot decisions by the named insiders.
Investors using insider activity as an input should consider the nature of each filing - the holding structure, whether a trade was executed under a Rule 10b5-1 plan, and whether a sale was required to meet tax-withholding obligations - before drawing conclusions about management sentiment. The filings also include contextual market information such as comparisons to 52-week highs and lows, year-to-date performance and InvestingPro Fair Value commentary where supplied in the disclosure materials.
Key points
- Large purchases were disclosed for GeneDx (WGS), Fortune Brands Innovations (FBIN), TXO Partners (TXO) and MP Materials (MP), with total known purchase values ranging from roughly $962,540 to $21.46 million for individual transactions described in filings.
- Major sales included a near $750 million block sale by a controlling shareholder at Carrier Global (CARR) and multimillion-dollar dispositions and automated sell-to-cover transactions at Astera Labs (ALAB) and CoreWeave (CRWV).
- The disclosed transactions were executed under a variety of structures - direct purchases, purchases by affiliated funds, Rule 10b5-1 trading plans and automatic sell-to-cover arrangements - which affect how the trades should be interpreted.
Risks and uncertainties
- Interpretation risk - The presence of Rule 10b5-1 plans and automatic sell-to-cover mechanisms means some large sales were not discretionary; using raw sell volumes alone to infer management sentiment may be misleading, particularly for companies in the technology and industrial sectors where restricted compensation is common.
- Valuation signals - Several filings reference InvestingPro Fair Value assessments that classify particular stocks as trading near Fair Value or appearing overvalued. Valuation commentary is limited to the InvestingPro analysis cited in the disclosures and does not substitute for a complete fundamental review.
- Market volatility - The filings note significant recent price movements for select names, such as GeneDx’s steep six-month decline and short-term rebound, which introduce short-term volatility risk for investors tracking insider activity in healthcare, materials and technology names.
Insider transaction reports provide discrete pieces of information about how corporate insiders and affiliated entities are trading company stock. While these filings can be useful as part of a broader research process, they do not in themselves reveal the full strategic or personal reasons behind each transaction. Readers should view the disclosed purchases and sales in light of the transactional structures and the contextual price information provided in the filings.