CEO Michael F. Mahoney buys $9 million of Boston Scientific Corp (BSX)

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How to read it

Form 4

The form a company insider (officer, director or owner of more than 10%) must file with the SEC within two business days of buying or selling the company's shares.

13F

A quarterly list of U.S. stocks held by an investment manager with more than $100 million, filed within 45 days after each quarter ends.

STOCK Act

A 2012 law that requires members of Congress to report stock trades by themselves, a spouse or a dependent child within 45 days.

A real example

In January 2016, when bank stocks were falling, JPMorgan Chase CEO Jamie Dimon bought 500,000 JPMorgan shares with his own money, worth about $26 million. His Form 4 made the purchase public within days, and investors read it as a strong sign of confidence.

Explain it like I'm 13

We read the long, boring forms that grown-ups file with the government and tell you what they say in normal words.

Data from public SEC filings and congressional reports. Information, not investment advice. Check every number against the filing linked on the page.

CEO Michael F. Mahoney buys $9 million of Boston Scientific Corp (BSX)

Michael F. Mahoney, chief executive, bought $9 million of stock after a 24.7% fall. WallStPal Score 71.

WallStPal ScoreHow much this purchase says, from 0 to 100. How it works

Michael F. Mahoney, chief executive of Boston Scientific Corp, bought 186,240 shares on the open market on August 3, 2026 at an average of $48.33 a share, for a total of $9 million. The purchase was reported to the SEC on Form 4 on August 5, 2026.

It raised their holding by 13%, to 1,590,024 shares.

The purchase came after a fall: Boston Scientific Corp stock was down 24.7% over the 13 weeks before.

3 other insiders also bought at least $10,000 of BSX within 30 days, which makes this a cluster buy.

In the 12 months up to this filing, Boston Scientific Corp insiders reported 4 open-market purchases and 0 sales.

WallStPal Score: 71 out of 100, because of a large purchase; 3 other insiders also bought; the stock had fallen 24.7% in the 13 weeks before; bought by a top executive.

What happened next: after 1 month the stock was down 0.5% (3.5 points worse than the S&P 500). Based on weekly prices from the week of the purchase.

Source: SEC Form 4 filing ↗. This story was written automatically from the filing and weekly price data. Information, not investment advice.

Examples

Big insider purchases have made news before. In January 2016, with bank stocks falling, JPMorgan Chase CEO Jamie Dimon bought 500,000 JPMorgan shares, about $26 million of his own money, and the purchase was widely reported as a sign of confidence.

Explain it like I'm 13

Michael F. Mahoney helps run Boston Scientific Corp. Spending $9 million of their own money on the company's stock is like a coach buying a big stack of tickets to their own team's games: it suggests they think the team will do well. It is not a promise, and insiders can be wrong.

More: all BSX insider trades · Michael F. Mahoney's track record