William A. Ackman is a corporate insider at PERSHING SQUARE HOLDCO, L.P. (PS). SEC records also connect Ackman to Pershing Square USA, Ltd. (PSUS) and Pershing Square SPARC Holdings, Ltd.. Ackman has reported 3 insider filings with the SEC since 2026. The most recent filing was in May 2026.
Every role William A. Ackman has reported on a Form 4, reconstructed from the filings themselves. Reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
PERSHING SQUARE INC. (PS)1 filingLatest filing:
William A. Ackman is CEO & Chairman, Director, 10% Owner of PERSHING SQUARE INC. (PS). 4 SEC Form 4 filings on record, most recently on 19 August 2026. Most recent open-market trade: bought $1.42M of PS on 5 May 2026. Lifetime open-market purchases: $259.87M. Historical track record: 3/5 stars across 8 tracked purchases.
Every recent SEC Form 4 transaction William A. Ackman has reported, most recent first.
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realized performance after each tracked open-market purchase.
| Metric | Value |
|---|---|
| InsiderAlpha rating | ★★★☆☆ (3/5) |
| Total purchases tracked | 8 |
| Purchases with forward-return data | 8 |
| 30-day win rate | 38% |
| 90-day win rate | 38% |
| Avg 5-day return | +7.05% |
| Avg 30-day return | +7.73% |
| Avg 90-day return | -3.49% |
| Best 30-day return |
InsiderAlpha's records for William A. Ackman go back to 2026: 4 primary Form 4 filings, an average of 4.0 per year. The typical open-market purchase is $32.48M (8 buys totaling $259.87M). The largest single buy on record is $175.00M of PSUS in 2026. No recorded transaction carries a Rule 10b5-1 plan flag. An absent flag does not establish whether a transaction was pre-arranged or discretionary.
No other insider has filed at William A. Ackman's companies, so these are insiders reporting open-market trades at other companies in the same sector.
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
William A. Ackman is a corporate insider, tracked as CEO & Chairman, Director, 10% Owner of PERSHING SQUARE INC. (PS). InsiderAlpha holds 4 primary Form 4 filings for them, the earliest from 2026, updated as new SEC EDGAR filings are processed.
1 primary Form 4 filing in the last 90 days, covering 1 company.
Recorded transactions: 8 open-market purchases ($259.87M) and 0 open-market sales across all tracked filings.
Across 8 tracked purchases, William A. Ackman averaged +7.7% avg 30-day return with a 38% 30-day win rate. InsiderAlpha rates the track record at 3/5 stars.
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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$PS PERSHING SQUARE INC.300.0K shares @ $0.00-
0 shares @ --
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