Mark C Biderman
CIK 1263606 · EVP & VICE CHAIRMAN · last filed 2026-04-03
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
ARI price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
340 MADISON AVENUE, 19TH FL
NEW YORK, NY 10173
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| ARI | Director | 70,374 | $2.33 | $163.6K | -$1.35M | 33 | 2026-04-03 |
| Full Circle Capital Corp (FULL) Delisted | Director | 0 | — | — | $44.0K | 2 | 2016-11-04 |
| Apollo Residential Mortgage, Inc. (AMTG) Delisted | Director | 32,784 | — | — | $78.0K | 8 | 2016-04-05 |
| Full Circle Capital Corp (FULL.L) Delisted | Director | 22,700 | — | — | $67.0K | 2 | 2015-04-08 |
| Atlas Energy, L.P. (ATLS) Delisted | Director | 0 | — | — | $189.7K | 10 | 2015-03-03 |
| AHD | Director | — | $26.22 | — | $0 | 1 | 2011-03-02 |
| NATIONAL FINANCIAL PARTNERS CORP (NFP) Delisted | EVP & VICE CHAIRMAN | 32,888 | — | — | $0 | 5 | 2008-11-18 |
Recent Filings · Page 7 of 8
76 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2011-08-12 | Atlas Energy, L.P. (ATLS) Delisted | Buy (P) | +2,200 | $43.3K | EDGAR |
| 2011-07-29 | Apollo Residential Mortgage, Inc. (AMTG) Delisted | Grant (A) | +5,000 | $0 | EDGAR |
| 2011-04-05 | ARI | Grant (A) | +2,301 | $0 | EDGAR |
| 2011-03-02 | AHD | Grant (A) | — | $0 | EDGAR |
| 2011-02-22 | — | Disp (D) | −12,000 | $0 | |
| 2010-12-02 | ARI | Grant (A) | +5,000 | $0 | EDGAR |
| 2010-09-03 | Full Circle Capital Corp (FULL) Delisted | Buy (P) | +5,000 | $44.0K | EDGAR |
| 2010-07-29 | — | Grant (A) | +1,200 | $0 | |
| 2010-07-14 | — | Grant (A) | +503 | $0 | |
| 2010-05-12 | — | Grant (A) | +10,000 | $327.5K |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.