Summary
Updated Aug 31, 2026
Mark C. Biderman files SEC Form 4 reports at Apollo Commercial Real Estate Finance, Inc. (ARI). 3 SEC Form 4 filings on record going back to 2025, most recently on 3 April 2026. Most recent open-market trade: sold $95K of ARI on 29 April 2025. Lifetime open-market sales: $95K.
Recent Transactions
3Every recent SEC Form 4 transaction Mark C. Biderman has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Mark C. Biderman files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Stuart Rothstein - $1.09M of ARI open-market activity in the last 12 months
- Carmencita N.M. Whonder - $50K of ARI open-market activity in the last 12 months
- Michael Salvati - $7K of ARI open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Mark C. Biderman?
Mark C. Biderman is a corporate insider of Apollo Commercial Real Estate Finance, Inc. (ARI). InsiderAlpha holds 3 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Mark C. Biderman last file a Form 4?
The most recent primary Form 4 on record is dated 3 April 2026, one of 3 filings going back to 2025.
Has Mark C. Biderman been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($95K) across all tracked filings.
Where can I see all of Mark C. Biderman's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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