Stephen P Macmillan - Net Worth and Insider Trading
Stephen P Macmillan Net Worth
The estimated net worth of Stephen P Macmillan is at least $211 Million dollars as of 2026-09-11. Stephen P Macmillan is the Chairman, President and CEO of Hologic Inc and owns about 2,381,453 shares of Hologic Inc (HOLX) stock worth over $181 Million. Stephen P Macmillan is also the President & CEO of Stryker Corp and owns about 112,586 shares of Stryker Corp (SYK) stock worth over $30 Million. Details can be seen in Stephen P Macmillan's Latest Holdings Summary section.
Disclaimer: The insider information is derived from SEC filings. The estimated net worth is based on the final shares held after open market or private purchases and sales of common stock with a transaction code of "P" or "S" on Form 4, assuming that Stephen P Macmillan has not made any transactions after 2025-09-22 and currently still holds the listed stock(s). Please note that this estimate may not reflect the actual net worth.
Transaction Summary of Stephen P Macmillan
Stephen P Macmillan Insider Ownership Reports
Based on ownership reports from SEC filings, as the reporting owner, Stephen P Macmillan owns 7 companies in total, including Boston Scientific Corp (BSX) , Hologic Inc (HOLX) , and Alere Inc (ALR) among others .
Click here to see the complete history of Stephen P Macmillan’s form 4 insider trades.
Insider Ownership Summary of Stephen P Macmillan
| Ticker | Company | Transaction Date | Type of Owner |
|---|---|---|---|
| BSX | Boston Scientific Corp | 2019-05-09 | director |
| HOLX | Hologic Inc | 2025-09-22 | director & Chairman & President and CEO |
| ALR | Alere Inc | 2013-10-31 | director |
 | | 2008-09-18 | director |
| | 2005-10-21 | director & President & CEO |
| | 2013-08-14 | director |
| | 2023-06-01 | director |
Stephen P Macmillan Latest Holdings Summary
Stephen P Macmillan currently owns a total of 2 stocks. Among these stocks, Stephen P Macmillan owns 2,381,453 shares of Hologic Inc (HOLX) as of September 22, 2025, with a value of $181 Million and a weighting of 85.62%. Stephen P Macmillan also owns 112,586 shares of Stryker Corp (SYK) as of October 21, 2005, with a value of $30 Million and a weighting of 14.38%.
Latest Holdings of Stephen P Macmillan
| Ticker | Company | Latest Transaction Date | Shares Owned | Current Price ($) | Current Value ($) |
|---|---|---|---|---|---|
| HOLX | Hologic Inc | 2025-09-22 | 2,381,453 | 76.01 | 181,014,243 |
| SYK | Stryker Corp | 2005-10-21 | 112,586 | 270.01 | 30,399,346 |
Holding Weightings of Stephen P Macmillan
Stephen P Macmillan Form 4 Trading Tracker
According to the SEC Form 4 filings, Stephen P Macmillan has made a total of 6 transactions in Hologic Inc (HOLX) over the past 5 years, including 0 buys and 6 sells. The most-recent trade in Hologic Inc is the sale of 138,358 shares on September 22, 2025, which brought Stephen P Macmillan around $9 Million.
According to the SEC Form 4 filings, Stephen P Macmillan has made a total of 0 transactions in Stryker Corp (SYK) over the past 5 years. The most-recent trade in Stryker Corp is the acquisition of 5,000 shares on October 21, 2005, which cost Stephen P Macmillan around $201,850.
Insider Trading History of Stephen P Macmillan
* The information on this page (including Insider Trading Shares, Share Changes, Cost, etc.) is sourced exclusively from Form 4 filings and does not incorporate any data from 13F or 13D/G filings. As a result, it may differ from the values shown on the Guru page.
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Stephen P Macmillan Trading Performance
GuruFocus tracks the stock performance after each of Stephen P Macmillan's buying transactions within different timeframes. To be detailed, the average return of stocks after 3 months bought by Stephen P Macmillan is 8.51%. GuruFocus also compares Stephen P Macmillan's trading performance to market benchmark return within the same time period. The performance of stocks bought by Stephen P Macmillan within 3 months outperforms 2 times out of 3 transactions in total compared to the return of S&P 500 within the same period.
You can select different timeframes to see how Stephen P Macmillan's insider trading performs compared to the benchmark.
Performance of Stephen P Macmillan
Average Return
Outperforming Transactions
| 1 Month | 3 Months | 6 Months | 1 Year | 2 Years | 3 Years | |
|---|---|---|---|---|---|---|
| Return(%) | 5.83 | | | | | |
| Relative Return to S&P 500(%) | 1.31 | | | | | |
Stephen P Macmillan Ownership Network
Ownership Network List of Stephen P Macmillan
Ownership Network Relation of Stephen P Macmillan
Stephen P Macmillan Owned Company Details
What does Boston Scientific Corp do?
Who are the key executives at Boston Scientific Corp?
Stephen P Macmillan is the director of Boston Scientific Corp. Other key executives at Boston Scientific Corp include President Michael F Mahoney , SVP&Pres & Endoscopy Arthur C Butcher , and EVP & Global Operations Padraig Andrew O'connor .
Boston Scientific Corp (BSX) Insider Trades Summary
Over the past 18 months, Stephen P Macmillan made no insider transaction in Boston Scientific Corp (BSX). Other recent insider transactions involving Boston Scientific Corp (BSX) include a net sale of 356,372 shares made by Joseph Michael Fitzgerald , a net sale of 467,989 shares made by Michael F Mahoney , and a net purchase of 580 shares made by Edward J Ludwig .
In summary, during the past 3 months, insiders sold 0 shares of Boston Scientific Corp (BSX) in total and bought 196,562 shares, with a net purchase of 196,562 shares. During the past 18 months, 1,118,274 shares of Boston Scientific Corp (BSX) were sold and 206,362 shares were bought by its insiders, resulting in a net sale of 911,912 shares.
Boston Scientific Corp (BSX)'s detailed insider trading history can be found in Insider Trading Tracker table.
Boston Scientific Corp Insider Transactions
Stephen P Macmillan Mailing Address
Above is the net worth, insider trading, and ownership report for Stephen P Macmillan. Based on the public information released on the U.S. Securities and Exchange Commission (SEC) website, Stephen P Macmillan's mailing address is: Marlborough Ma 01752.
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