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.
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Disclosed Exposure
$755.8K
Companies
10
Total Filings
73
Lifetime Open-Market Net
-$976.1K
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| ARI | Director | 70,374 | $10.74 | $755.8K | -$513.5K | 16 | 2026-04-03 |
| Apollo Commercial Real Estate Finance, Inc. (ARIpC) Delisted | Director | 52,167 | — | — | -$841.3K | 10 | 2019-04-03 |
| Full Circle Capital Corp (FULL) Delisted | Director | 0 | — | — | $44.0K | 2 | 2016-11-04 |
| Apollo Commercial Real Estate Finance, Inc. (ARIpA) Delisted | Director | 51,875 | — | — | $0 | 7 | 2016-04-05 |
| Apollo Residential Mortgage, Inc. (AMTGpA) Delisted | Director | 32,784 | — | — | $0 | 5 | 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 |
| Apollo Residential Mortgage, Inc. (AMTG) Delisted | Director | 12,040 | — | — | $78.0K | 3 | 2012-04-04 |
| Atlas Energy, L.P. (AHD) Delisted | Director | — | — | — | $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
73 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2011-03-02 | Atlas Energy, L.P. (AHD) Delisted | 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 | |
| 2009-07-30 | Atlas Energy, L.P. (ATLS) Delisted | Grant (A) | +892 | $0 | EDGAR |
| 2008-11-18 | NATIONAL FINANCIAL PARTNERS CORP (NFP) Delisted | Mixed | +6,262 | $0 | EDGAR |
| 2008-02-20 | NATIONAL FINANCIAL PARTNERS CORP (NFP) Delisted | Mixed | +1,853 | $0 | EDGAR |
Codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.