IVAN G SEIDENBERG
CIK 1187727 · Chairman · last filed 2026-02-19
"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
$17.62M
Companies
7
Total Filings
232
Lifetime Open-Market Net
-$8.78M
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 |
|---|---|---|---|---|---|---|---|
| MSGS | Director | — | $381.69 | — | $0 | 12 | 2026-02-19 |
| PWP | Director | 9,476 | $16.40 | $155.4K | $0 | 2 | 2022-05-26 |
| BLK | Director | 14,434 | $1128.10 | $16.28M | $0 | 36 | 2020-04-02 |
| BXP | Director | 9,038 | $67.06 | $606.1K | $0 | 17 | 2016-05-02 |
| VERIZON COMMUNICATIONS INC (WWVY) Delisted | Chairman | 629,218 | — | — | -$8.78M | 139 | 2011-12-27 |
| HON | Director | 2,755 | $209.98 | $578.5K | $0 | 20 | 2008-02-27 |
| WYETH (WYE) Delisted | Director | 8,086 | — | — | $0 | 6 | 2008-01-23 |
Recent Filings · Page 5 of 24
232 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 |
|---|---|---|---|---|---|
| 2015-07-02 | BLK | Grant (A) | +84 | $0 | EDGAR |
| 2015-07-01 | BXP | Grant (A) | — | $0 | EDGAR |
| 2015-05-28 | BXP | Grant (A) | +910 | $0 | EDGAR |
| 2015-05-04 | BXP | Grant (A) | — | $0 | EDGAR |
| 2015-04-02 | BLK | Grant (A) | +501 | $0 | EDGAR |
| 2015-04-02 | BXP | Grant (A) | — | $0 | EDGAR |
| 2015-01-29 | BXP | Grant (A) | — | $0 | EDGAR |
| 2015-01-05 | BLK | Grant (A) | +82 | $0 | EDGAR |
| 2015-01-05 | BXP | Grant (A) | — | $0 | EDGAR |
| 2014-11-03 | BXP | Grant (A) | — | $0 | EDGAR |
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.