Mark C Biderman - Net Worth and Insider Trading
Mark C Biderman Net Worth
The estimated net worth of Mark C Biderman is at least $547,016 dollars as of 2026-07-27. Mark C Biderman is the Director of Apollo Commercial Real Estate Finance Inc and owns about 60,787 shares of Apollo Commercial Real Estate Finance Inc (ARI) stock worth over $410,616. Mark C Biderman is also the Director of Apollo Residential Mortgage Inc and owns about 10,000 shares of Apollo Residential Mortgage Inc (AMTG) stock worth over $136,400. Details can be seen in Mark C Biderman'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 Mark C Biderman has not made any transactions after 2025-04-29 and currently still holds the listed stock(s). Please note that this estimate may not reflect the actual net worth.
Transaction Summary of Mark C Biderman
Mark C Biderman Insider Ownership Reports
Based on ownership reports from SEC filings, as the reporting owner, Mark C Biderman owns 7 companies in total, including Apollo Commercial Real Estate Finance Inc (ARI) , Atlas Energy Group LLC (ATLSW) , and Great Elm Capital Corp (GECC) among others .
Click here to see the complete history of Mark C Biderman’s form 4 insider trades.
Insider Ownership Summary of Mark C Biderman
| Ticker | Company | Transaction Date | Type of Owner |
|---|---|---|---|
| ARI | Apollo Commercial Real Estate Finance Inc | 2025-04-29 | director |
| ATLSW | Atlas Energy Group LLC | 2018-01-02 | director |
| GECC | Great Elm Capital Corp | 2016-11-03 | director |
| 2016-09-01 | director | ||
| 2016-08-31 | director | ||
| 2011-11-11 | director | ||
| 2015-02-27 | director |
Mark C Biderman Latest Holdings Summary
Mark C Biderman currently owns a total of 2 stocks. Among these stocks, Mark C Biderman owns 60,787 shares of Apollo Commercial Real Estate Finance Inc (ARI) as of April 29, 2025, with a value of $410,616 and a weighting of 75.06%. Mark C Biderman also owns 10,000 shares of Apollo Residential Mortgage Inc (AMTG) as of November 11, 2011, with a value of $136,400 and a weighting of 24.94%.
Latest Holdings of Mark C Biderman
| Ticker | Company | Latest Transaction Date | Shares Owned | Current Price ($) | Current Value ($) |
|---|---|---|---|---|---|
| ARI | Apollo Commercial Real Estate Finance Inc | 2025-04-29 | 60,787 | 6.76 | 410,616 |
| AMTG | Apollo Residential Mortgage Inc | 2011-11-11 | 10,000 | 13.64 | 136,400 |
Holding Weightings of Mark C Biderman
Mark C Biderman Form 4 Trading Tracker
According to the SEC Form 4 filings, Mark C Biderman has made a total of 4 transactions in Apollo Commercial Real Estate Finance Inc (ARI) over the past 5 years, including 0 buys and 4 sells. The most-recent trade in Apollo Commercial Real Estate Finance Inc is the sale of 10,000 shares on April 29, 2025, which brought Mark C Biderman around $94,800.
According to the SEC Form 4 filings, Mark C Biderman has made a total of 0 transactions in Apollo Residential Mortgage Inc (AMTG) over the past 5 years. The most-recent trade in Apollo Residential Mortgage Inc is the acquisition of 5,000 shares on November 11, 2011, which cost Mark C Biderman around $77,950.
Insider Trading History of Mark C Biderman
* 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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Mark C Biderman Trading Performance
GuruFocus tracks the stock performance after each of Mark C Biderman's buying transactions within different timeframes. To be detailed, the average return of stocks after 3 months bought by Mark C Biderman is 10.88%. GuruFocus also compares Mark C Biderman's trading performance to market benchmark return within the same time period. The performance of stocks bought by Mark C Biderman within 3 months outperforms 2 times out of 2 transactions in total compared to the return of S&P 500 within the same period.
You can select different timeframes to see how Mark C Biderman's insider trading performs compared to the benchmark.
Performance of Mark C Biderman
Mark C Biderman Ownership Network
Ownership Network List of Mark C Biderman
Ownership Network Relation of Mark C Biderman

Mark C Biderman Owned Company Details
What does Apollo Commercial Real Estate Finance Inc do?
Who are the key executives at Apollo Commercial Real Estate Finance Inc?
Mark C Biderman is the director of Apollo Commercial Real Estate Finance Inc. Other key executives at Apollo Commercial Real Estate Finance Inc include director & President & CEO Stuart Rothstein , CFO & Secretary & Treasurer Anastasia G. Mironova , and CFO & Treasurer and Secretary Jai Agarwal .
Apollo Commercial Real Estate Finance Inc (ARI) Insider Trades Summary
Over the past 18 months, Mark C Biderman made 1 insider transaction in Apollo Commercial Real Estate Finance Inc (ARI) with a net sale of 10,000. Other recent insider transactions involving Apollo Commercial Real Estate Finance Inc (ARI) include a net sale of 208,293 shares made by Stuart Rothstein , a net sale of 26,974 shares made by Whonder Carmencita N.m. ,
In summary, during the past 3 months, insiders sold 4,574 shares of Apollo Commercial Real Estate Finance Inc (ARI) in total and bought 0 shares, with a net sale of 4,574 shares. During the past 18 months, 245,267 shares of Apollo Commercial Real Estate Finance Inc (ARI) were sold and 0 shares were bought by its insiders, resulting in a net sale of 245,267 shares.
Apollo Commercial Real Estate Finance Inc (ARI)'s detailed insider trading history can be found in Insider Trading Tracker table.
Apollo Commercial Real Estate Finance Inc Insider Transactions
Mark C Biderman Mailing Address
Above is the net worth, insider trading, and ownership report for Mark C Biderman. Based on the public information released on the U.S. Securities and Exchange Commission (SEC) website, Mark C Biderman's mailing address is: New York Ny 10173.