Stephen Mayo - Net Worth and Insider Trading
Stephen Mayo Net Worth
The estimated net worth of Stephen Mayo is at least $391,806 dollars as of 2025-04-14. Stephen Mayo is the Director of Sarepta Therapeutics Inc and owns about 6,621 shares of Sarepta Therapeutics Inc (SRPT) stock worth over $355,713. Stephen Mayo is also the Director of Allogene Therapeutics Inc and owns about 25,328 shares of Allogene Therapeutics Inc (ALLO) stock worth over $36,092. Details can be seen in Stephen Mayo'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 Mayo has not made any transactions after 2024-03-05 and currently still holds the listed stock(s). Please note that this estimate may not reflect the actual net worth.

Transaction Summary of Stephen Mayo
Stephen Mayo Insider Ownership Reports
Based on ownership reports from SEC filings, as the reporting owner, Stephen Mayo owns 4 companies in total, including Merck & Co Inc (MRK) , Sarepta Therapeutics Inc (SRPT) , and Merck & Co Inc (MRKPRB.PFD) among others .
Click here to see the complete history of Stephen Mayo’s form 4 insider trades.
Insider Ownership Summary of Stephen Mayo
Ticker | Comapny | Transaction Date | Type of Owner |
---|---|---|---|
MRK | Merck & Co Inc | 2021-03-15 | director |
SRPT | Sarepta Therapeutics Inc | 2024-03-05 | director |
MRKPRB.PFD | Merck & Co Inc | 2021-03-15 | director |
![]() | ![]() | 2023-08-07 | director |
Stephen Mayo Latest Holdings Summary
Stephen Mayo currently owns a total of 2 stocks. Among these stocks, Stephen Mayo owns 6,621 shares of Sarepta Therapeutics Inc (SRPT) as of March 5, 2024, with a value of $355,713 and a weighting of 90.79%. Stephen Mayo also owns 25,328 shares of Allogene Therapeutics Inc (ALLO) as of August 7, 2023, with a value of $36,092 and a weighting of 9.21%.
Latest Holdings of Stephen Mayo
Ticker | Comapny | Latest Transaction Date | Shares Owned | Current Price ($) | Current Value ($) |
---|---|---|---|---|---|
SRPT | Sarepta Therapeutics Inc | 2024-03-05 | 6,621 | 53.73 | 355,713 |
ALLO | Allogene Therapeutics Inc | 2023-08-07 | 25,328 | 1.43 | 36,092 |
Holding Weightings of Stephen Mayo
Stephen Mayo Form 4 Trading Tracker
According to the SEC Form 4 filings, Stephen Mayo has made a total of 2 transactions in Sarepta Therapeutics Inc (SRPT) over the past 5 years, including 0 buys and 2 sells. The most-recent trade in Sarepta Therapeutics Inc is the sale of 3,135 shares on March 5, 2024, which brought Stephen Mayo around $385,480.
According to the SEC Form 4 filings, Stephen Mayo has made a total of 1 transactions in Allogene Therapeutics Inc (ALLO) over the past 5 years, including 0 buys and 1 sells. The most-recent trade in Allogene Therapeutics Inc is the sale of 10,000 shares on August 7, 2023, which brought Stephen Mayo around $42,900.
Insider Trading History of Stephen Mayo
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Stephen Mayo Trading Performance
Stephen Mayo Ownership Network
Ownership Network List of Stephen Mayo
Ownership Network Relation of Stephen Mayo

Stephen Mayo Owned Company Details
What does Merck & Co Inc do?
Who are the key executives at Merck & Co Inc?
Stephen Mayo is the director of Merck & Co Inc. Other key executives at Merck & Co Inc include SVP & U.S. Market Johannes Jacobus Oosthuizen , EVP,Chief Info&Digital Officer David Michael Williams , and Chief Comm. & Public Afrs Ofcr Cristal N Downing .
Merck & Co Inc (MRK) Insider Trades Summary
Over the past 18 months, Stephen Mayo made no insider transaction in Merck & Co Inc (MRK). Other recent insider transactions involving Merck & Co Inc (MRK) include a net sale of 29,540 shares made by Johannes Jacobus Oosthuizen , a net sale of 7,451 shares made by David Michael Williams , and a net sale of 235,021 shares made by Robert M Davis .
In summary, during the past 3 months, insiders sold 16,861 shares of Merck & Co Inc (MRK) in total and bought 17,833 shares, with a net purchase of 972 shares. During the past 18 months, 372,189 shares of Merck & Co Inc (MRK) were sold and 17,833 shares were bought by its insiders, resulting in a net sale of 354,356 shares.
Merck & Co Inc (MRK)'s detailed insider trading history can be found in Insider Trading Tracker table.
Merck & Co Inc Insider Transactions
Stephen Mayo Mailing Address
Above is the net worth, insider trading, and ownership report for Stephen Mayo. Based on the public information released on the U.S. Securities and Exchange Commission (SEC) website, Stephen Mayo's mailing address is: Kenilworth Nj 07033.