StoneX, CoreWeave Executives Sell Shares; Insiders Buy at Artiva, Energizer

Executives at StoneX Group and CoreWeave sold millions of dollars in company stock, according to recent regulatory filings, while major shareholders made significant purchases in Artiva Biotherapeutics and Energizer Holdings. These transactions offer investors a glimpse into the actions of those with the most intimate knowledge of their companies.

Notable Insider Sales

Multiple executives at financial services firm StoneX Group (NASDAQ:SNEX) sold shares following the exercise of stock options. The sales, disclosed for July 22, come after the stock has gained over 77% in the past year.

• Executive Vice-Chairman Sean Michael O’Connor sold shares worth approximately $7.8 million.
• Chief Risk Officer Mark Lowry Maurer disposed of stock valued at $3.89 million.
• Chief Financial Officer William J. Dunaway sold shares for a total of $7.13 million.

At cloud provider CoreWeave, Inc. (CRWV), CEO and President Michael N. Intrator sold 303,692 shares for a total of approximately $24.1 million. The filings note these transactions, which occurred on July 21, were executed under a pre-arranged Rule 10b5-1 trading plan adopted in November 2025.

Separately, Mojgan M. Lefebvre, an Executive Vice President at The Travelers Companies, Inc. (NYSE:TRV), sold shares totaling $6.01 million on July 21 after acquiring them through option exercises.

Significant Buys Signal Confidence

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On the buy side, RA Capital Management, a 10% owner of Artiva Biotherapeutics, Inc. (NASDAQ:ARTV), purchased shares worth approximately $2.58 million. The acquisitions occurred over three days at prices between $9.55 and $9.96 per share, even as the stock has gained 194% over the past year.

At Energizer Holdings, Inc. (NYSE:ENR), 10% owner and director Aqua Capital, Ltd. acquired 120,000 shares for a total of $2.43 million. The purchases were made on July 21 and July 22.

Meanwhile, executives at Byrna Technologies Inc. (NASDAQ:BYRN) bought shares as the stock traded near its 52-week low. Chairman TJ Kennedy purchased stock for $102,285, and CEO Conn Q. Davis acquired shares worth $77,002.

Context for Investors

Insider transactions are closely watched indicators of executive sentiment. Open-market purchases are often viewed as a direct signal of confidence in a company's future performance, as seen at Artiva and Energizer.

Insider sales can be more nuanced. While they can sometimes indicate concern, they are often part of planned financial strategies for diversification, tax liabilities, or personal liquidity. Sales conducted under Rule 10b5-1 plans, like the one at CoreWeave, are scheduled in advance to avoid conflicts of interest and do not necessarily reflect an executive's current outlook on the company.