Here is a consolidated review of the most notable insider buying and selling reported for Wednesday, May 6, 2026.
Top buys
Alkami Technology, Inc. - Investment vehicles affiliated with General Atlantic executed a sequence of purchases that together amounted to more than 2 million shares of Alkami common stock over transactions conducted between May 4 and May 6, 2026. The aggregate consideration for these purchases totaled approximately $34.7 million. Activity on May 4 accounted for 521,771 shares acquired at a weighted average price of $16.92 per share; the individual transactions that day recorded prices between $16.67 and $17.18. The disclosures note these purchases occurred while the stock is trading down 27% year-to-date. Additionally, an InvestingPro analysis cited in the filings characterized Alkami as appearing undervalued despite the company reporting 33% revenue growth.
Rallybio Corp. - ADAR1 Capital Management, LLC together with Daniel Schneeberger, who is identified as a 10 percent owner, made coordinated purchases of Rallybio common stock on May 4 and May 5, 2026, with combined consideration of roughly $2.18 million. The total number of shares acquired was 155,905. On May 4, the first tranche comprised 3,900 shares purchased at a weighted average of $13.8978 per share, with trade prices ranging from $13.8611 to $14.0000. Also on May 4, a larger block of 116,904 shares was bought at a weighted average price of $13.9705 per share. The following day, May 5, the buyers added 35,101 shares at a weighted average price of $13.9956. The company’s stock is reported to be trading near its 52-week high of $15.31 after a year-to-date gain of 505% referenced in the filings.
Insperity, Inc. - Paul J. Sarvadi, who serves as Chairman of the Board and Chief Executive Officer, acquired 100,000 shares of Insperity common stock on May 5, 2026. The total purchase value was approximately $2,873,235. The filings detail three direct buy transactions: 50,057 shares at a weighted average price of $28.20 per share (individual trade prices $27.97 to $28.95), 49,543 shares at a weighted average price of $29.26 per share (individual trade prices $28.98 to $29.80), and a smaller purchase of 400 shares at $30.00 per share. At the time of the filing Insperity shares were reported trading near $28.75, down 53% over the prior year, while an InvestingPro analysis referenced a Fair Value estimate of $39.19.
Affiliated Managers Group, Inc. - Director Cates G. Staley purchased 1,500 shares of Affiliated Managers Group common stock on May 6, 2026, at $305.83 per share, for an outlay of approximately $458,745. After the transaction Mr. Staley is reported to directly own 6,405 shares of AMG common stock. The filings note AMG is trading near $306 and has returned 77% over the past year, and an InvestingPro viewpoint included in the disclosure described the shares as appearing undervalued and highlighted active management share buybacks.
Top sells
CoreWeave, Inc. - Selling activity tied to Magnetar Financial LLC and affiliated entities dominated disclosures, with cumulative sales reported to exceed $370 million across May 4 and May 5, 2026. On May 5, Magnetar-affiliated entities sold 978,764 shares for approximately $124.96 million, with weighted average prices in the range of $126.00 to $129.51 per share. That same day, additional Magnetar-related entities including Magnetar Financial LLC, Magnetar Capital Partners LP, Supernova Management LLC and David J. Snyderman sold 349,937 shares for about $44,614,575. Separately, on May 4 Magnetar Funds reported selling 1,155,164 shares for roughly $147,037,492 at prices between $126.52 and $129.38 per share. The disclosures emphasize the timing of those sales as notable given that CRWV shares have since risen to $138.04, representing a 23.64% gain over the last week and a 157% return over the prior year. An InvestingPro analysis included in the filings indicates the stock appears overvalued relative to its Fair Value, trading at elevated revenue and EBITDA multiples.
Rush Street Interactive, Inc. - Significant disposition of shares was reported by Neil Bluhm, Executive Chairman, through the NGB 2013 Grandchildren's Dynasty Trust. The trust sold a total of 10,512,150 shares of Class A Common Stock across May 5 and May 6, 2026, yielding approximately $262,383,264 in proceeds at a sale price of $24.96 per share. Those sales followed conversion activity in which the trust exchanged Class A Common Units of Rush Street Interactive, L.P. for Class A Common Stock. On May 5 the filings record conversion of 9,141,000 Class A Common Units into an equal number of Class A Common Stock shares, along with cancellation of an equivalent number of Class V Voting Stock shares. A similar exchange involving 1,371,150 Class A Common Units occurred on May 6. The filings note the stock has produced a 142% return over the past year and is trading at $27.86, more than $2.90 above the trust’s sale price.
Context and considerations
The assembled disclosures present a mix of concentrated purchases and concentrated sales among large holders, fund-affiliated buyers and executive-level sellers. In some cases, the filings cite third-party valuation commentary that characterizes shares as appearing undervalued (Alkami, Insperity, Affiliated Managers Group) or overvalued (CoreWeave) relative to stated Fair Value metrics. Other disclosures simply report trade activity and contemporaneous market prices and percentage moves over weekly and annual horizons.
Market participants reviewing these filings may weigh the scale and timing of the transactions - for example, the Magnetar-related sales in CoreWeave and the trust conversions and subsequent sales in Rush Street Interactive - against the broader price performance cited in the disclosures. The filings themselves include no explicit statements tying the transactions to forward-looking company developments; they report the mechanics, sizes, prices and timing of the trades and add third-party valuation observations where noted.
Bottom line
Insider disclosures for the first week of May 2026 show heavy, high-value activity concentrated in a handful of names. Buyers affiliated with General Atlantic and other insiders increased positions in Alkami, Rallybio, Insperity and Affiliated Managers Group. Large-scale sellers included Magnetar-linked entities in CoreWeave and a trust associated with Rush Street Interactive’s executive chairman. Filings reference valuation views and recent price performance; investors and analysts should consider these transactions as one set of signals among many when assessing company outlooks and market positions.