Here is a structured review of the most material insider trading disclosures recorded on Monday across U.S. public markets, organized by the largest purchases and the most significant sales reported in recent SEC filings. The transactions span operating executives, company directors, and institutional investment managers and involve both common stock and a preferred security.
Top buys
Strategy Inc (NASDAQ:MSTR) - The company’s President and Chief Executive Officer, Le Phong, reported a direct acquisition of 11,000 shares of the company's Series A Perpetual Stretch Preferred Stock on June 22, 2026. The total consideration for the purchase was $998,756, with per-share prices in the range of $90.66 to $90.87. The shares were acquired through the Phong Le Revocable Trust, for which Mr. Le is both trustee and beneficiary. The filing notes this insider purchase at a time when Strategy Inc’s common shares are trading near a 52-week low of $104.17. The current reported share price stands at $109.53, and the stock has recorded a 70% decline over the past year. Market analysis referenced in the filing indicates the stock is trading below its Fair Value assessment and is described as appearing undervalued at current levels.
ConnectM Technology Solutions, Inc (NASDAQ:CNTM) - Several large insider purchases were disclosed for ConnectM involving senior executives.
- Bhaskar Panigrahi, chief executive officer and director, acquired a total of 3,359 shares of common stock over a two-day span in June 2026, according to a Form 4 filing. Those purchases comprised 1,309 shares on June 10, 2026 and 2,050 shares on the following day. The prices paid across those transactions ranged from $8,887.0 to $14,280.0 per share. The aggregated value of these purchases is reported at approximately $40.9 million.
- Mahesh Choudhury, principal financial officer, disclosed purchases of common stock across multiple dates between June 8, 2026 and June 18, 2026. Mr. Choudhury bought an aggregate of 2,637 shares through his brokerage account for a total reported cost of $12,684,890. The per-share prices in these transactions ranged from $327.0 to $6,580.0. Following the final reported purchase on June 18, 2026, Mr. Choudhury directly held 37,192 shares of ConnectM common stock.
Mammoth Energy Services, Inc (NASDAQ:TUSK) - A group of entities managed by Wexford Capital LP disclosed an indirect acquisition of common shares. Filings made with the Securities and Exchange Commission on June 22, 2026 record activity dated June 17, 2026, where Wexford-affiliated trading vehicles purchased 4,019,574 shares of Mammoth Energy Services common stock at a per-share price of $2.6043. The total amount for the purchase is approximately $10,468,176. The acquired shares were transacted through Wexford Spectrum Trading Limited, Wexford Catalyst Trading Limited, and Wexford Focused Trading Limited, each managed by Wexford Capital LP. The filing contextualizes this purchase against recent price performance for TUSK shares, which have appreciated by 65% over the last six months and are currently quoted at $2.92. An analysis cited in the filing notes that TUSK appears overvalued based on a Fair Value assessment, despite the recent price momentum.
Top sells
Kymera Therapeutics, Inc (NASDAQ:KYMR) - Director Bruce Booth reported a set of transactions that resulted in the sale of common stock totaling about $45.3 million. Those sales took place between June 17 and June 22, 2026. The timing of the dispositions corresponds with Kymera trading near its 52-week high of $105, while the most recent reported price is $99.45. Over the past year the stock has delivered a reported 115% return. The filing also records that on June 17 Mr. Booth exercised stock options to acquire 11,741 shares at an exercise price of $20.00 per share, incurring a total exercise cost of $234,820. The filing indicates those options were fully vested and exercisable. An analysis referenced in the filing characterizes the stock as appearing overvalued and lists it on a Most Overvalued roster maintained by the referenced market analysis service.
WaterBridge Infrastructure LLC (NASDAQ:WBI) - Multiple related entities and insiders disclosed coordinated sales of Class A shares that together represent a substantial block. The primary disclosure identifies WaterBridge Resources LLC and WaterBridge NDB LLC, both described as meaningful 10% owners, as parties to a sale of 5,894,826 Class A shares on June 22, 2026. The shares were disposed of at $30.05 per share, producing gross proceeds of $177,139,521. The filing places those sales against a backdrop of strong recent performance for WBI shares, which have returned 45% over the preceding six months and are quoted at $29.98 in the filing. The filing additionally notes analysts expect the company to report profitability this year with projected earnings per share of $1.07, and an external analysis describes the stock as appearing fairly valued at current levels.
The filings provide further specificity about how the overall block was distributed among entities indirectly controlled by the reporting owners. NDB Holdings LLC reported selling 3,920,948 Class A shares; Desert Environmental Holdings LLC reported selling 543,064 Class A shares; and WBR Holdings LLC reported disposing of 1,430,814 Class A shares. Those sales were executed through a broker-dealer in connection with a sale under Rule 144.
The WaterBridge disclosures are reiterated in related filings that link the selling entities to Five Point Energy affiliates and to David N. Capobianco, a director and ten percent owner, all reporting the same 5,894,826 share sale totaling $177,139,521 at $30.05 per share on June 22, 2026. The filings note that WBI shares had risen 45% over the prior six months and that shares had retreated to $29.98 from a previous close of $33.19, reflecting a recent pullback of 7% over the past week from that prior close. The filings cite the same detail on the allocation of shares among NDB Holdings, Desert Environmental Holdings, and WBR Holdings in connection with a Rule 144 sale.
Acadian Asset Management Inc (AAMI) - The filings record a material sale by Paulson & Co. Inc., an investment manager and a reported 10% owner. On June 17, 2026 Paulson & Co. Inc. sold 1,900,000 shares at a per-share price of $77.25, generating proceeds of $146,775,000. After the disposition the filing shows Paulson & Co. Inc. indirectly holds 5,843,282 shares of Acadian Asset Management. The disclosure states Paulson & Co. Inc. serves as investment manager for various funds that are the direct owners of the securities, and that both Paulson & Co. Inc. and its controlling person, John Paulson, may be considered indirect beneficial owners of the shares.
Context and interpretation
The clustered filings over mid-June and the formal disclosures on June 22, 2026 illustrate how insider and affiliated-party transactions can reflect a range of motives and circumstances. The reported purchases by operating executives at ConnectM and by Strategy Inc’s CEO were made directly or through a revocable trust and are highlighted alongside a large, multi-million-dollar institutional entry into Mammoth Energy Services. Conversely, the market witnessed coordinated, large-scale sales from principal holders and insiders at WaterBridge Infrastructure, a significant option exercise and following sales by a Kymera director, and a block disposition by Paulson & Co. at Acadian Asset Management.
These filings, while providing transactional detail and timing, do not in themselves disclose the motives behind each purchase or sale. The transaction data should be considered as part of a broader set of information about company fundamentals, valuation metrics, and price momentum when evaluating potential investment implications.
Key points
- Prominent insider buying occurred at Strategy Inc and ConnectM, including purchases by the CEO and CFO at ConnectM and a preferred-stock buy by Strategy Inc’s CEO.
- Large-scale institutional and affiliated-party activity included a multi-million-dollar indirect purchase in Mammoth Energy Services and coordinated multi-entity sales in WaterBridge Infrastructure.
- Significant sell transactions were reported from a Kymera director and Paulson & Co. at Acadian Asset Management, reflecting sizeable liquidity events across biotech, asset-management and infrastructure-linked names.
Risks and uncertainties
- Valuation uncertainty - Several filings reference external analysis labeling certain stocks as overvalued or undervalued, indicating differing views on Fair Value that introduce valuation risk for investors in technology and energy sectors.
- Concentrated holder sales - The WaterBridge filings show large aggregated disposals by related entities and insiders, which may affect supply-demand dynamics and price volatility in the infrastructure sector.
- Limited disclosure of motivation - The filings document quantities, dates and prices but do not reveal the personal or strategic reasons behind purchases or sales, leaving interpretation of insider intent uncertain across the affected sectors.
Monitoring insider transactions is a tool for market participants to gauge how executives and major holders are managing equity exposure. Purchases by insiders can be read as an expression of confidence, while sales can reflect a variety of motives including portfolio rebalancing or other personal financial planning. However, transaction filings alone do not offer a complete picture and should be combined with company-specific fundamentals and technical indicators when forming an investment view.