Pershing Square Activist
Bill Ackman · Bill Ackman's concentrated, activist investment firm.
Largest known positions
13F + Form 4Each company's largest reported value across this investor's 13F filings (quarter-end value) and Form 4 insider filings (shares held × latest price). Colour shows the source.
Filing timeline
Every 13F quarter, open-market Form 4 trade and 5%+ stake filing (Schedule 13D/G) on one axis.
Timeline
Top lane: reported 13F value each quarter. Middle: open-market Form 4 purchases (green) and sales (red), sized by dollars. Bottom: Schedule 13D (activist) and 13G (passive) filings for 5%+ stakes. Hover for details.
Recent filings
| Filed | Form | Filer | Company | Detail | |
|---|---|---|---|---|---|
| Loading… | |||||
Pershing Square Capital Management, L.P.
13F portfolio · $13.7B across 11 positions as of 2026-03-31 · full filing detail →
PERSHING SQUARE INC.
13F portfolio · $19.5B across 15 positions as of 2026-06-30 · full filing detail →
Insider (Form 4) stakes
Companies where this investor reports as an officer, director or 10% owner.
WILLIAM A ACKMAN
63 filings| Company | Role | Shares | Value | Last filing |
|---|---|---|---|---|
| HHH Howard Hughes Holdings | 10% owner | 18,851,964 | $1.4B | 2023-12-11 |
| PSUS Pershing Square USA, L | Officer | 4,841,000 | $177M | 2026-05-01 |
| PS PERSHING SQUARE INC. | 10% owner | 1,668,200 | $89M | 2026-08-19 |
| ZTS Zoetis Inc. | Director | 41,823,145 | $2.9B | 2015-07-02 stale |
| CMG CHIPOTLE MEXICAN GRILL | Director | 1,089,295 | $35M | 2021-09-08 stale |
| HHC Howard Hughes Corp | 10% owner | 16,530,051 | — | 2023-06-22 stale |
| PAH Element Solutions Inc | 10% owner | 40,451,506 | — | 2018-08-07 stale |
| CP CANADIAN PACIFIC RAILW | Director | — | — | 2016-08-05 stale |
| JCP J C PENNEY CO INC | 10% owner | 39,075,771 | — | 2013-07-03 stale |
| GGP GENERAL GROWTH PROPERT | Director | 23,953,782 | — | 2010-03-10 stale |
| BGP BORDERS GROUP INC | 10% owner | 10,597,880 | — | 2007-11-29 stale |
| CEN CERIDIAN CORP /DE/ | 10% owner | — | — | 2007-02-06 stale |
About this profile
Large investors show up in SEC filings under several names. A family office usually files a 13F (quarterly holdings, if it manages over $100M in US equities) under its firm name, while the same money appears in Form 4 filings under the person's or holding company's name when it owns 10% or more of a company or sits on its board. Some — like Cascade Investment — hold most of their stock through large ownership stakes and file no 13F at all.
This page joins those filings into one view. 13F values are as of quarter end and are filed up to 45 days later. Form 4 values use the latest share count reported times a recent price. Neither shows cash, bonds, private companies or short positions.