Here is a consolidated review of the most significant insider buying and selling activity disclosed on Thursday across U.S. public markets. The filings reflect concentrated director buying in healthcare, dental and financial stocks, alongside large rule-based disposals by senior executives and major stakeholders in technology names.
Top insider buys
DENTSPLY SIRONA Inc. (NASDAQ:XRAY)
Director Jonathan Jay Mazelsky reported an open market purchase of 10,000 shares of common stock on June 12, 2026. The transaction was executed at $10.14 per share, representing a total outlay of $101,400. The acquisition comes as the company's shares trade close to a 52-week low of $9.40 and the stock has declined about 30% over the previous 12 months. The filing notes the company yields 6.2% in dividend income and has a track record of 32 consecutive years of dividend payments. In addition, third-party analysis cited in the filing characterizes the stock as appearing undervalued at current levels.
HAMMER TECHNOLOGY HOLDINGS CORP. (NASDAQ:HMMR)
Michael Sevell, a director and holder of a ten percent ownership stake, disclosed purchases of company common stock aggregating $2,740,799. The reported transactions took place between May 2025 and April 2026, with executed prices between $0.10 and $0.264 per share. On May 25, 2025, Mr. Sevell acquired 10,154,542 shares at $0.264 per share. Those shares were purchased indirectly through Caban Global Reach Private Equity LP, an entity in which Mr. Sevell has a general partner-managing member interest. After the transaction, his indirect ownership rose to 18,222,778 shares.
Abbott Laboratories (NYSE:ABT)
Director John G. Stratton bought 2,000 shares of the company on May 7, 2026, at $86.82 per share, for a total reported investment of $173,640. Following the purchase, Mr. Stratton directly holds 23,319 shares of Abbott common stock. At the time of reporting the filing, Abbott shares were trading at $88.41, which is above Mr. Stratton's purchase price. The filing highlights the firm has sustained dividend payments for 56 consecutive years and currently offers a yield of 2.85%. The disclosure also cites analysis that places the stock on a Most Undervalued list.
INFINITY NATURAL RESOURCES, INC. (NASDAQ:INR)
Director Scott Gieselman purchased 10,000 shares of Class A Common Stock on June 17, 2026, at a weighted average price of $12.944, for a total of $129,440. Individual trade prices ranged from $12.88 to $13.00. At the time of the filing, INR shares were trading near $12.79 and had declined roughly 32% over the past year. The disclosure indicates external analysis viewing the stock as undervalued and notes that analysts expect the company to be profitable this year with net income growth projected. Following his purchase, Mr. Gieselman indirectly holds 95,000 shares of Class A Common Stock through CMR Family Investments LLC, an entity over which he serves as investment manager and is a member. The filing states he disclaims beneficial ownership of those securities except to the extent of any pecuniary interest. Mr. Gieselman also directly retains 13,929 shares of Class A Common Stock.
Kearny Financial Corp. (NASDAQ:KRNY)
Director Curtland E. Fields reported buying a total of 8,550 shares across transactions on June 17 and June 18, 2026, for an aggregate of $71,525. Prices ranged from $8.335 to $8.42 per share. The purchases were executed as follows: on June 17, 4,950 shares at $8.335; on June 18, 1,228 shares at $8.40, 1,972 shares at $8.41, and 400 shares at $8.42. At the time of the filings, the stock traded at $8.51 and had appreciated about 47% over the past year. The disclosure also references a Fair Value assessment of $10.03, indicating the company may still be undervalued relative to that benchmark.
Top insider sells
CoreWeave, Inc. (NASDAQ:CRWV)
Several large sales by CoreWeave insiders were reported mid-June. Brian M. Venturo, the company's Chief Strategy Officer and a director, sold a total of 76,924 shares of Class A Common Stock on June 17, 2026. The disposals, effected through indirect holdings, generated about $9.11 million in proceeds at weighted average prices from $115.3167 to $121.5738. The sales were made under a Rule 10b5-1 trading plan that Mr. Venturo adopted on November 13, 2025.
The filing describes a breakdown of the sales carried out by West Clay Capital LLC, an entity where Mr. Venturo is managing member. West Clay Capital sold 61,539 shares across multiple tranches, including 12,703 shares sold between $115.03 and $116.02; 3,697 shares between $116.03 and $116.67; 2,580 shares between $117.03 and $117.98; 9,425 shares between $118.04 and $119.035; 21,360 shares between $119.04 and $120.03; 8,574 shares between $120.04 and $121.02; and 3,200 shares between $121.13 and $121.92.
Separately, Michael N. Intrator, CoreWeave's CEO and President, sold 307,692 shares of Class A Common Stock on June 16, 2026, for roughly $35.9 million. Those sales occurred at prices ranging from $108.2743 to $119.2081 per share and were executed under a Rule 10b5-1 trading plan Mr. Intrator adopted on November 20, 2025. The filings coincide with a period of recent strong performance for the stock; CoreWeave shares were trading at $117.92 and had risen about 17.3% over the prior week and about 64.71% year-to-date, while trading well below their 52-week high of $187. The filings also cite external analysis suggesting the shares are presently overvalued relative to an assessed Fair Value.
Bumble Inc. (NASDAQ:BMBL)
Entities associated with Blackstone Inc. reported sale of 7,477,500 shares of Class A Common Stock on June 16, 2026. The transactions totaled $28,228,310 and were executed at a price of $3.7751 per share. Following the sale, the stock had since declined to $2.96 and was down about 44% over the prior 12 months. The disclosure identifies the sellers as several reporting persons including BX Buzz ML-1 GP LLC and BX Buzz ML-7 GP LLC, affiliates of Blackstone and ultimately controlled by its founder. The reporting persons are listed as ten percent owners of Bumble Inc.
AppLovin Corp (NASDAQ:APP)
Director Eduardo Vivas sold 158,410 shares of Class A Common Stock on June 16, 2026, producing proceeds of approximately $82,620,803. The trades were executed at prices ranging from $494.84 to $520.30 per share and were made pursuant to a Rule 10b5-1 trading plan Mr. Vivas adopted on December 10, 2025. The filing presents the range-based prices as weighted averages across multiple trades and notes AppLovin's stock has declined around 31% in the last six months, trading at $469.71 at the time of reporting. External valuation analysis cited in the filing suggests the stock appears undervalued relative to a computed Fair Value.
Datadog, Inc. (NASDAQ:DDOG)
Datadog Chief Executive Officer Olivier Pomel sold 84,698 shares of Class A Common Stock on June 16, 2026, for total proceeds of $19,675,499. The transaction prices ranged from $226.4336 to $235.9447 per share. These sales were carried out under a Rule 10b5-1 trading plan Mr. Pomel established on December 15, 2025. The filing notes Datadog shares had increased about 74% over the previous 12 months and that the current market price sits above an assessed Fair Value, per external analysis included in the disclosure. The filing also points to the company sustaining gross profit margins near 80%.
Interpretation and context from filings
The mix of insider activity this period is notable for its contrast. Several board members and sizable owners increased stakes in companies concentrated in healthcare, dental equipment, natural resources and regional banking, while senior executives and large shareholders in technology-facing firms executed sizable, rule-based disposals.
Director purchases at DENTSPLY SIRONA, Abbott and Infinity Natural Resources were highlighted alongside a meaningful accumulation at Kearny Financial, where a director added more than 8,500 shares over two days. Those filings link the purchases to valuations that third-party analysis considers attractive in each instance, and several of the purchased names are identified as having extended histories of dividend payments or improving profit expectations in the case of Infinity Natural Resources. The HMMR purchases reflect substantial indirect accumulation through a related private equity entity.
On the sell side, the reported large sales were executed under Rule 10b5-1 trading plans in most instances. CoreWeave's CEO and Chief Strategy Officer both pared stakes under separate 10b5-1 plans established in November 2025. AppLovin's director and Datadog's CEO sold under plans adopted in December 2025. The Blackstone-affiliated entities' sale of Bumble shares is reported as a significant block transaction. The filings link these sales to proceeds running into the mid- and high-single-digit millions for individuals and entities, and tens of millions in the case of AppLovin and CoreWeave leadership.
What investors can take away
Insider buying often draws attention because it can signal management and directors are allocating personal capital to their companies. Conversely, sales are frequently explained as portfolio rebalancing or liquidity actions, particularly when conducted under pre-arranged trading plans. The filings reported here provide a snapshot of where company insiders are committing capital or taking proceeds, but they do not provide explanations beyond the mechanics disclosed - for example, whether purchases reflect a change in underwriting assumptions or whether sales reflect diversification objectives.
Market participants tracking these disclosures may weigh them alongside fundamental indicators such as dividend track records, recent price performance, third-party Fair Value assessments, and profitability expectations where those are referenced in the filings. The filings note both undervaluation signals at several purchased stocks and overvaluation signals at some sold names, according to the external analysis cited in the disclosures.
Summary of material transactions
- Jonathan Jay Mazelsky - XRAY: 10,000 shares at $10.14 on June 12, 2026 - $101,400.
- Michael Sevell - HMMR: purchases totaling $2,740,799 between May 2025 and April 2026, including 10,154,542 shares at $0.264 on May 25, 2025; indirect ownership rose to 18,222,778 shares.
- John G. Stratton - ABT: 2,000 shares at $86.82 on May 7, 2026 - $173,640; holds 23,319 shares post-transaction.
- Scott Gieselman - INR: 10,000 Class A shares at weighted average $12.944 on June 17, 2026 - $129,440; indirectly holds 95,000 shares via CMR Family Investments LLC and directly 13,929 shares.
- Curtland E. Fields - KRNY: 8,550 shares acquired June 17-18, 2026 at $8.335 to $8.42 - $71,525 total.
- Brian M. Venturo - CRWV: 76,924 shares sold June 17, 2026; proceeds approx. $9.11 million; sold under 10b5-1 plan.
- Michael N. Intrator - CRWV: 307,692 shares sold June 16, 2026; proceeds approx. $35.9 million; sold under 10b5-1 plan.
- Blackstone-affiliated entities - BMBL: 7,477,500 shares sold June 16, 2026 at $3.7751 per share - proceeds $28,228,310.
- Eduardo Vivas - APP: 158,410 shares sold June 16, 2026 at $494.84 to $520.30 - proceeds approx. $82,620,803; sold under 10b5-1 plan.
- Olivier Pomel - DDOG: 84,698 shares sold June 16, 2026 at $226.4336 to $235.9447 - proceeds $19,675,499; sold under 10b5-1 plan.
Closing note
These filings provide visibility into how insiders are allocating or liquidating positions across sectors. The data set includes director purchases in healthcare and banking, and large executive sales in technology and consumer-facing app companies. Investors should consider these disclosures as one input among many, and interpret them in the context of company fundamentals, valuation assessments and broader portfolio objectives.