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
$458.5K
Companies
7
Total Filings
76
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 | $6.51 | $458.5K | -$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 | — | $25.45 | — | $0 | 1 | 2011-03-02 |
| NATIONAL FINANCIAL PARTNERS CORP (NFP) Delisted | EVP & VICE CHAIRMAN | 32,888 | — | — | $0 | 5 | 2008-11-18 |
Recent Filings · Page 3 of 8
76 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2018-01-03 | — | Mixed | — | -$115 | |
| 2017-08-03 | ARI | Grant (A) | +2,872 | $0 | EDGAR |
| 2017-04-05 | ARI | Grant (A) | +2,668 | $0 | EDGAR |
| 2017-03-06 | ARI | Sell (S) | −15,000 | -$273.4K | EDGAR |
| 2017-03-03 | — | Mixed | — | -$10.5K | |
| 2017-02-01 | — | Mixed | +2,871 | -$14.2K | |
| 2017-01-03 | ARI | Grant (A) | +15,000 | $0 | EDGAR |
| 2016-11-04 | Full Circle Capital Corp (FULL) Delisted | Disp (D) | −22,700 | $0 | EDGAR |
| 2016-09-02 | ARI | Grant (A) | +13,689 | $0 | EDGAR |
| 2016-09-02 | — | Disp (D) | −32,784 | $0 |
Form 4 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.
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.
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.