WILLIAM A ACKMAN
CIK 1056513 · CEO & Chairman · last filed 2026-08-19
WILLIAM A ACKMAN is a CEO & Chairman who has filed 63 SEC Form 4 insider transactions across 12 companies since 2007. The most recent filing, for PS, was dated Aug 19, 2026. Across all open-market trades the lifetime net is −$5.40B, making them a net seller over the disclosed history. Current disclosed insider exposure totals $6.50B across reported positions. 148 SEC filings were submitted jointly with Pershing Square Capital Management, L.P.
"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.
$6.50B
12
63
-$5.40B
Filer Profile
9TH FLOOR
NEW YORK, NY 10019
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| PS | CEO & Chairman | 1,668,200 | $40.13 | $66.94M | $0 | 1 | 2026-08-19 |
| PSUS | Chief Executive Officer | 4,841,000 | $38.60 | $186.86M | $240.86M | 1 | 2026-05-01 |
| HHH | Director | 18,851,964 | $60.98 | $1.15B | $214.05M | 10 | 2023-12-11 |
| Howard Hughes Corp (HHC) Delisted | Director | 16,530,051 | $78.76 | $1.30B | $1.53B | 25 | 2023-06-22 |
| CMG | Director | 54,464,750 | $37.10 | $2.02B | -$3.23B | 11 | 2021-09-08 |
| Element Solutions Inc (PAH) Delisted | Director | 40,451,506 | — | — | $0 | 3 | 2018-08-07 |
| CP | Director | 0 | $90.02 | $0 | -$4.18B | 1 | 2016-08-05 |
| ZTS | Director | 41,823,145 | $73.62 | $3.08B | -$0 | 1 | 2015-07-02 |
| J C PENNEY CO INC (JCP) Delisted | Director | 39,075,771 | — | — | $0 | 3 | 2013-07-03 |
| GENERAL GROWTH PROPERTIES INC (GGP) Delisted | Director | 23,953,782 | — | — | $0 | 2 | 2010-03-10 |
| BORDERS GROUP INC (BGP) Delisted | 10%+ Owner | 10,597,880 | — | — | $25.33M | 1 | 2007-11-29 |
| CERIDIAN CORP /DE/ (CEN) Delisted | 10%+ Owner | — | $20.73 | — | $0 | 1 | 2007-02-06 |
Recent Filings
63 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-08-19 | PS | Gift (G) | −20,000,000 | $0 | EDGAR |
| 2026-05-01 | PSUS | Buy (P) | +4,897,171 | $240.86M | EDGAR |
| 2023-12-11 | HHH | Buy (P) | +30,075 | $2.25M | EDGAR |
| 2023-12-06 | HHH | Buy (P) | +20,208 | $1.51M | EDGAR |
| 2023-11-17 | HHH | Buy (P) | +604,800 | $44.96M | EDGAR |
| 2023-11-14 | HHH | Buy (P) | +479,013 | $34.41M | EDGAR |
| 2023-11-09 | HHH | Buy (P) | +570,744 | $41.23M | EDGAR |
| 2023-10-19 | HHH | Buy (P) | +362,517 | $24.70M | EDGAR |
| 2023-10-06 | HHH | Buy (P) | +353,319 | $24.64M | EDGAR |
| 2023-09-28 | HHH | Buy (P) | +296,478 | $21.89M | EDGAR |
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.