Insider filings made public on Tuesday reveal a mix of substantial purchases and large disposals across a range of U.S. listed companies. The single largest disclosed purchase was executed by investment entities affiliated with Cynosure Group, LLC into Black Rock Coffee Bar, Inc. (NASDAQ:BRCB). Several other directors and affiliated funds reported smaller but meaningful purchases, while a number of executives and investment funds completed large sales through planned programs and public offering-related dispositions.
Top insider buys
Black Rock Coffee Bar, Inc. (NASDAQ:BRCB) - The most significant insider acquisition reported Tuesday involved investment entities tied to Cynosure Group, LLC, which collectively purchased approximately $72.99 million of Black Rock Coffee Bar shares on May 15, 2026. The filings show acquisitions of 12,042,712 shares of Class B Common Stock and 1,600,000 shares of Class A Common Stock, each transacted at $5.35 per share. After these purchases, the reporting persons indirectly hold 19,915,304 shares of Class B Common Stock and 1,916,012 shares of Class A Common Stock. Cynosure Group, LLC is identified in the filing as a director and a 10 percent owner of Black Rock Coffee Bar, and the affiliated entities are managed such that Cynosure holds sole voting and investment power over the shares held by these entities.
The filing is notable both for its size and timing. At the time of the disclosure, BRCB shares were trading close to a 52-week low of $6.63 and were down roughly 76% over the past year. InvestingPro analysis cited in the filings indicates that analysts have set price targets between $15 and $22, which, relative to the cited current price of $6.68, implies a material upside in those estimates.
Lifeway Foods, Inc. (NASDAQ:LWAY) - William Zolezzi and entities linked to him - Divisadero Street Capital, LLC and Divisadero Street Partners GP, LLC - reported buying a combined $4,200,968 of Lifeway Foods common stock across several transactions on May 14 and May 15, 2026. The purchases totaled 165,045 shares, with transaction prices ranging from $22.9794 to $26.3251 per share.
CVB Financial Corp (NASDAQ:CVBF) - Director George A. Borba Jr. reported an indirect acquisition of 25,187 shares of common stock on May 19, 2026 through George Borba & Son Dairy, L.P., a California limited partnership in which he is a general partner. The total value of the filing was approximately $499,999, with purchase prices ranging from $19.805 to $19.88 per share and a weighted average of $19.8515 per share. After the transaction, the partnership holds 846,308 shares of CVB Financial common stock. The filing notes the stock trading near $19.82 and references InvestingPro analysis suggesting the shares appear undervalued relative to its Fair Value.
Rivian Automotive, Inc. (NASDAQ:RIVN) - Director Aidan N. Gomez made a direct purchase of 18,000 shares of the company’s Class A Common Stock on May 15, 2026 for $13.97 per share, resulting in an aggregate transaction amount of $251,460. Following the purchase, Mr. Gomez’s direct ownership stood at 57,984 shares. The filing highlights Rivian trading at $12.89 and down 34.5% year-to-date. The filing also references InvestingPro analysis which suggests the stock is undervalued at current levels and notes that nine analysts have revised their earnings upwards for the upcoming period, according to InvestingPro Tips.
XBP Global Holdings, Inc. (NASDAQ:XBP) - Director Randal T. Klein purchased 25,000 shares of common stock on May 19, 2026. The transactions totaled $61,100, with individual prices ranging from $2.17 to $2.65 per share and a weighted average of $2.4440. After these purchases, Mr. Klein directly holds 40,000 shares of common stock. The filing points out that XBP shares were trading near a 52-week low of $2.00, having fallen 77% over the prior year. InvestingPro commentary cited in the filing indicated that the stock’s RSI suggests it is in oversold territory and that it trades at a low Price/Book multiple of 0.46.
Top insider sells
Neptune Insurance Holdings Inc. (NASDAQ:NP) - Selling activity dominated the filings for Neptune, with two large blocks disclosed. Investment funds affiliated with FTV Management VII, L.P. - including FTV VII, L.P., FTV NE-Aggregator, LLC, and Growth VII-Centre, L.P. - collectively sold 6,039,850 shares of Class A Common Stock for an aggregate value of approximately $159.45 million. The transactions took place on May 15 and May 19, 2026, with all shares sold at $26.40 per share. The filing states that on May 15, 2026, the reporting entities disposed of 5,252,044 shares in connection with a public offering of Neptune Insurance Holdings’ Class A Common Stock, as described in a prospectus dated May 13, 2026. Neptune shares were trading at approximately $26.70 at the time of the filing, near the sale price, and the company’s market capitalization is cited as $3.77 billion.
In a separate Neptune filing, entities tied to Gene Yoon, Managing Partner of Bregal Sagemount Management LP, reported sales of Class A Common Stock totaling about $139.3 million. These transactions also occurred on May 15 and May 19, 2026 and were executed at $26.40 per share. The filing states that on May 15, BSIV Hold 101, LP - identified as a 10% owner of Neptune Insurance - disposed of 4,589,351 shares of Class A Common Stock in connection with the public offering, amounting to roughly $121.0 million. The filing cites InvestingPro analysis indicating Neptune appears overvalued at current levels.
StoneX Group Inc. (NASDAQ:SNEX) - Executive Vice-Chairman Sean O’Connor sold 300,000 shares of common stock for total proceeds of $33,166,803. The sales were executed over a series of days from May 15 to May 19, 2026, at average prices ranging from $109.939 to $111.4632 per share. The filing notes that these sales followed the exercise of stock options that immediately preceded the dispositions - Mr. O’Connor acquired 300,000 shares at a price of $13.34 per share, totaling $4,002,000, immediately prior to selling the shares. The filing also references the stock’s strong performance over the past year - an 85% return - and cites InvestingPro analysis suggesting the shares are currently overvalued relative to its Fair Value estimate.
Slide Insurance Holdings, Inc. (NASDAQ:SLDE) - Chief Executive Officer Bruce Lucas sold approximately $18.9 million of common stock between May 15 and May 19, 2026. The filings show the disposition of 997,881 shares executed under a pre-arranged Rule 10b5-1 trading plan adopted on November 21, 2025. The sales were carried out indirectly through IIM Holdings II, LLC, an entity controlled by Mr. Lucas. On May 15, 2026, 269,881 shares were sold for about $5.09 million at a weighted average price of $18.84 per share, with individual share prices ranging from $18.75 to $19.02. On May 18, 2026, 455,000 shares were sold for approximately $8.67 million at a weighted average price of $19.06 per share, with individual prices from $18.90 to $19.27. The final tranche on May 19 involved 273,000 shares sold for roughly $5.18 million at a weighted average price of $18.97 per share, with individual prices between $18.75 and $19.07. The filing notes Slide Insurance’s valuation at $2.17 billion and that the stock was trading near $18.48, below an InvestingPro Fair Value of $20.66. The filing highlights the proximity of earnings, scheduled for May 22.
Monolithic Power Systems Inc. (NASDAQ:MPWR) - Maurice Sciammas, Executive Vice President of Worldwide Sales & Marketing, reported sales of 12,000 shares on May 15, 2026 for total proceeds of approximately $18,736,849. The transactions were executed pursuant to a Rule 10b5-1 trading plan adopted on November 24, 2025, with prices ranging from $1,549.62 to $1,586.76 per share. After these sales, Mr. Sciammas directly holds 166,644 shares of Monolithic Power Systems common stock. The filings also list a range of additional indirect holdings across trusts and accounts, specifically: 1,699 shares in The Joseph Roger Sciammas 2020 Irrevocable Trust; 2,000 shares in the Rosalind Sciammas Family 2021 Trust; 51,023 shares in the Sciammas Family Trust; 25,097 shares in Various Sciammas GRATs; 1,699 shares in The Patrick Francis Sciammas 2020 Irrevocable Trust; 4,015 shares by Sciammas Trust 2020; 1,000 shares in the Peter Rafferty and Eric Toothill 2021 Trust; 1,699 shares in The Chloe Liliane Sciammas 2020 Irrevocable Trust; 1,209 shares in the Clement Sciammas Trust; 5,000 shares in the Clement Sciammas Family 2021 Trust; and 919 shares in the Rosalind Sciammas Brokerage Account. The filing points out that MPWR stock has risen 111% over the past year, despite an 8.2% decline in the most recent week, and cites InvestingPro analysis indicating the shares are currently overvalued relative to its Fair Value, trading at a P/E ratio of 106.61.
Context and closing observations
These filings underline a mix of directional bets by directors, affiliated funds and senior executives across consumer-facing, financial, insurance and semiconductor sectors. The day’s largest buy, the Cynosure-linked purchase of Black Rock Coffee Bar stock, concentrates a substantial amount of capital into a company trading near multi-quarter lows. Several buys were executed by directors and related entities, while the largest sells frequently reflected either public offering-related dispositions or structured sales under 10b5-1 plans and option exercises.
Tracking such insider transactions can provide context on how those closest to the companies are positioning their holdings, but filings alone do not establish causal claims about future performance. The filings and accompanying notes reiterate that purchases can be interpreted as a signal of confidence, while sales do not necessarily imply diminished expectations - common explanations for sales cited in the filings include diversification, tax planning and the exercise of stock options. The filings also emphasize that the size, timing and pattern of purchases and sales can offer additional color when combined with other fundamental and technical indicators.
Investors and observers should note the recurring references in the filings to InvestingPro analysis and Fair Value estimates, which are cited across multiple company filings as context for whether the shares are currently viewed as undervalued or overvalued by that analysis. Where the filings provide specific upcoming dates - for example, Slide Insurance’s earnings scheduled for May 22 - they appear alongside the transaction details and valuation commentary.
As always with insider filings, the disclosures document what insiders and affiliates have transacted and provide the concrete particulars - quantities, prices, dates and ownership after the transaction - that allow market participants to assess those moves alongside other information.