Stephen A Sherwin - Net Worth and Insider Trading
Stephen A Sherwin Net Worth
The estimated net worth of Stephen A Sherwin is at least $3 Million dollars as of 2025-07-12. Stephen A Sherwin is the Director of Biogen Inc and owns about 11,318 shares of Biogen Inc (BIIB) stock worth over $2 Million. Stephen A Sherwin is the Director of Neurocrine Biosciences Inc and owns about 10,673 shares of Neurocrine Biosciences Inc (NBIX) stock worth over $1 Million. Stephen A Sherwin is also the Director of Fresh Tracks Therapeutics Inc and owns about 2 shares of Fresh Tracks Therapeutics Inc (FRTX) stock worth over $2. Details can be seen in Stephen A Sherwin'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 A Sherwin has not made any transactions after 2025-03-07 and currently still holds the listed stock(s). Please note that this estimate may not reflect the actual net worth.

Transaction Summary of Stephen A Sherwin
Stephen A Sherwin Insider Ownership Reports
Based on ownership reports from SEC filings, as the reporting owner, Stephen A Sherwin owns 12 companies in total, including Biogen Inc (BIIB) , Neurocrine Biosciences Inc (NBIX) , and Neon Therapeutics Inc (NTGN) among others .
Click here to see the complete history of Stephen A Sherwin’s form 4 insider trades.
Insider Ownership Summary of Stephen A Sherwin
Ticker | Company | Transaction Date | Type of Owner |
---|---|---|---|
BIIB | Biogen Inc | 2025-03-07 | director |
NBIX | Neurocrine Biosciences Inc | 2025-02-13 | director |
NTGN | Neon Therapeutics Inc | 2020-05-06 | director |
![]() | ![]() | 2020-05-05 | director |
![]() | ![]() | 2003-07-28 | director |
![]() | ![]() | 2013-03-05 | director |
![]() | ![]() | 2013-05-23 | director |
![]() | ![]() | 2009-10-14 | director |
![]() | ![]() | 2018-06-06 | director |
![]() | ![]() | 2021-12-02 | director |
![]() | ![]() | 2022-09-16 | director |
![]() | ![]() | 2022-09-16 | director |
Stephen A Sherwin Latest Holdings Summary
Stephen A Sherwin currently owns a total of 3 stocks. Among these stocks, Stephen A Sherwin owns 11,318 shares of Biogen Inc (BIIB) as of March 7, 2025, with a value of $2 Million and a weighting of 51.61%. Stephen A Sherwin owns 10,673 shares of Neurocrine Biosciences Inc (NBIX) as of February 13, 2025, with a value of $1 Million and a weighting of 48.39%. Stephen A Sherwin also owns 2 shares of Fresh Tracks Therapeutics Inc (FRTX) as of May 23, 2013, with a value of $2 and a weighting of 0%.
Latest Holdings of Stephen A Sherwin
Ticker | Company | Latest Transaction Date | Shares Owned | Current Price ($) | Current Value ($) |
---|---|---|---|---|---|
BIIB | Biogen Inc | 2025-03-07 | 11,318 | 134.21 | 1,518,989 |
NBIX | Neurocrine Biosciences Inc | 2025-02-13 | 10,673 | 133.46 | 1,424,419 |
FRTX | Fresh Tracks Therapeutics Inc | 2013-05-23 | 2 | 0.94 | 2 |
Holding Weightings of Stephen A Sherwin
Stephen A Sherwin Form 4 Trading Tracker
According to the SEC Form 4 filings, Stephen A Sherwin has made a total of 1 transactions in Biogen Inc (BIIB) over the past 5 years, including 0 buys and 1 sells. The most-recent trade in Biogen Inc is the sale of 8,760 shares on March 7, 2025, which brought Stephen A Sherwin around $1 Million.
According to the SEC Form 4 filings, Stephen A Sherwin has made a total of 4 transactions in Neurocrine Biosciences Inc (NBIX) over the past 5 years, including 0 buys and 4 sells. The most-recent trade in Neurocrine Biosciences Inc is the sale of 13,831 shares on February 13, 2025, which brought Stephen A Sherwin around $2 Million.
According to the SEC Form 4 filings, Stephen A Sherwin has made a total of 0 transactions in Fresh Tracks Therapeutics Inc (FRTX) over the past 5 years. The most-recent trade in Fresh Tracks Therapeutics Inc is the acquisition of 2 shares on May 23, 2013, which cost Stephen A Sherwin around $70.
Insider Trading History of Stephen A Sherwin
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Stephen A Sherwin Trading Performance
GuruFocus tracks the stock performance after each of Stephen A Sherwin's buying transactions within different timeframes. To be detailed, the average return of stocks after 3 months bought by Stephen A Sherwin is -62.29%. GuruFocus also compares Stephen A Sherwin's trading performance to market benchmark return within the same time period. The performance of stocks bought by Stephen A Sherwin within 3 months outperforms 0 times out of 1 transactions in total compared to the return of S&P 500 within the same period.
You can select different timeframes to see how Stephen A Sherwin's insider trading performs compared to the benchmark.
Performance of Stephen A Sherwin
Stephen A Sherwin Ownership Network
Ownership Network List of Stephen A Sherwin
Ownership Network Relation of Stephen A Sherwin

Stephen A Sherwin Owned Company Details
What does Biogen Inc do?
Who are the key executives at Biogen Inc?
Stephen A Sherwin is the director of Biogen Inc. Other key executives at Biogen Inc include Head of Development Priya Singhal , Head of Research Jane Grogan , and EVP & Human Resources Ginger Gregory .
Biogen Inc (BIIB) Insider Trades Summary
Over the past 18 months, Stephen A Sherwin made 1 insider transaction in Biogen Inc (BIIB) with a net sale of 8,760. Other recent insider transactions involving Biogen Inc (BIIB) include a net sale of 5,863 shares made by Priya Singhal , a net purchase of 1,235 shares made by Caroline Dorsa , and a net purchase of 455 shares made by Eric K Rowinsky .
In summary, during the past 3 months, insiders sold 3,806 shares of Biogen Inc (BIIB) in total and bought 1,235 shares, with a net sale of 2,571 shares. During the past 18 months, 14,623 shares of Biogen Inc (BIIB) were sold and 1,690 shares were bought by its insiders, resulting in a net sale of 12,933 shares.
Biogen Inc (BIIB)'s detailed insider trading history can be found in Insider Trading Tracker table.
Biogen Inc Insider Transactions
Stephen A Sherwin Mailing Address
Above is the net worth, insider trading, and ownership report for Stephen A Sherwin. Based on the public information released on the U.S. Securities and Exchange Commission (SEC) website, Stephen A Sherwin's mailing address is: South San Francisco Ca 94080.