Key facts
- This page summarizes William A. Ackman's Form 4 filing for Pershing Square SPARC Holdings, Ltd./DE.
- 2 reported transactions and 9 derivative rows are listed below.
- Accepted by SEC: 23 Apr 2026, 20:55.
William A. Ackman - 21 Apr 2026 Form 4 Insider Report for Pershing Square SPARC Holdings, Ltd./DE
- Reporting relationship
- Chief Executive Officer, Director, 10%+ Owner
- Issuer ticker
- N/A
- Reported as of
- 21 Apr 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 23 Apr 2026, 20:55:03 UTC
- Prior SEC filing
- 29 Sep 2023
- Next SEC filing
- 28 Apr 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ William A. Ackman
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
William A. Ackman filed Form 4 for Pershing Square SPARC Holdings, Ltd./DE on 23 Apr 2026.
Change
- Previous filing in this sequence was filed on 29 Sep 2023.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (3)
CIK 0001056513
Primary reporting owner
ACKMAN WILLIAM A
- Relationship
- Chief Executive Officer, Director, 10%+ Owner
- Address
- 787 ELEVENTH AVENUE, 9TH FLOOR, NEW YORK
- Signature
- /s/ William A. Ackman
- Signature date
- 23 Apr 2026
CIK 0001336528
Pershing Square Capital Management, L.P.
- Relationship
- 10%+ Owner
- Address
- 787 ELEVENTH AVENUE, 9TH FLOOR, NEW YORK
- Signature
- PERSHING SQUARE CAPITAL MANAGEMENT, L.P., By: /s/ William A. Ackman, Authorized Signatory
- Signature date
- 23 Apr 2026
CIK 0001336477
PS Management GP, LLC
- Relationship
- 10%+ Owner
- Address
- 787 ELEVENTH AVENUE, 9TH FLOOR, NEW YORK
- Signature
- PSCM GP, LLC, By: /s/ William A. Ackman, Authorized Signatory
- Signature date
- 23 Apr 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
No ticker
transaction
Common Stock
Other
- Transaction value
- Shares
- 0
- Change %
- 0%
- Price
- Shares after
- 422,533
- Date
- 21 Apr 2026
- Ownership
- See footnotes
- Footnotes
- F1, F2, F3, F4, F5
No ticker
transaction
Common Stock
Other
- Transaction value
- Shares
- 0
- Change %
- 0%
- Price
- Shares after
- 422,533
- Date
- 21 Apr 2026
- Ownership
- See footnotes
- Footnotes
- F1, F2, F3, F4, F5
No ticker
transaction
Common Stock
Other
- Transaction value
- Shares
- 0
- Change %
- 0%
- Price
- Shares after
- 422,533
- Date
- 21 Apr 2026
- Ownership
- See footnotes
- Footnotes
- F1, F2, F3, F4, F5
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
No ticker
transaction
Derivative
Sponsor Warrants
Other
- Transaction value
- Shares
- 0
- Change %
- Price
- Shares after
- $35,892,480
- Date
- 21 Apr 2026
- Ownership
- See footnotes
- Underlying class
- See footnote 10
- Underlying amount
- Exercise price
- Footnotes
- F1, F3, F4, F5, F10, F11
No ticker
transaction
Derivative
Sponsor Warrants
Other
- Transaction value
- Shares
- 0
- Change %
- Price
- Shares after
- $35,892,480
- Date
- 21 Apr 2026
- Ownership
- See footnotes
- Underlying class
- See footnote 10
- Underlying amount
- Exercise price
- Footnotes
- F1, F3, F4, F5, F10, F11
No ticker
transaction
Derivative
Sponsor Warrants
Other
- Transaction value
- Shares
- 0
- Change %
- Price
- Shares after
- $35,892,480
- Date
- 21 Apr 2026
- Ownership
- See footnotes
- Underlying class
- See footnote 10
- Underlying amount
- Exercise price
- Footnotes
- F1, F3, F4, F5, F10, F11
No ticker
holding
Derivative
Forward Purchase Shares
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 250,000
- Date
- 21 Apr 2026
- Ownership
- See footnotes
- Underlying class
- See footnote 6
- Underlying amount
- 250,000
- Exercise price
- Footnotes
- F3, F4, F5, F6, F7
No ticker
holding
Derivative
Forward Purchase Shares
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 250,000
- Date
- 21 Apr 2026
- Ownership
- See footnotes
- Underlying class
- See footnote 6
- Underlying amount
- 250,000
- Exercise price
- Footnotes
- F3, F4, F5, F6, F7
No ticker
holding
Derivative
Forward Purchase Shares
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 250,000
- Date
- 21 Apr 2026
- Ownership
- See footnotes
- Underlying class
- See footnote 6
- Underlying amount
- 250,000
- Exercise price
- Footnotes
- F3, F4, F5, F6, F7
No ticker
holding
Derivative
Forward Purchase Shares (Right to buy)
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 3,250,000
- Date
- 21 Apr 2026
- Ownership
- See footnotes
- Underlying class
- See footnote 8
- Underlying amount
- 3,250,000
- Exercise price
- Footnotes
- F3, F4, F5, F8, F9
No ticker
holding
Derivative
Forward Purchase Shares (Right to buy)
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 3,250,000
- Date
- 21 Apr 2026
- Ownership
- See footnotes
- Underlying class
- See footnote 8
- Underlying amount
- 3,250,000
- Exercise price
- Footnotes
- F3, F4, F5, F8, F9
No ticker
holding
Derivative
Forward Purchase Shares (Right to buy)
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 3,250,000
- Date
- 21 Apr 2026
- Ownership
- See footnotes
- Underlying class
- See footnote 8
- Underlying amount
- 3,250,000
- Exercise price
- Footnotes
- F3, F4, F5, F8, F9
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 11 footnotes
Footnote F1
On April 21, 2026, approximately 1.8% of the membership interest in the Sponsor (as defined below) were transferred from PSLP (as defined below) to PS Redemption, L.P. ("RedemptionCo"), which was formed for the purpose of giving effect to the redemption of certain limited partner interests of PSLP in connection with a special redemption opportunity that was consummated on April 21, 2026. The membership interest transferred to RedemptionCo represents a proportionate number of shares of the Issuer's common stock, par value $0.0001 per share ("Common Stock") and Sponsor Warrants (as defined below) held by the Sponsor. The transfer of the membership interest did not result in a change of aggregate ownership of the Issuer's common stock and Sponsor Warrants by the Sponsor.
Footnote F2
(Continued from Footnote 1) The 422,533 shares of the Issuer's Common Stock were issued to the Sponsor prior to the Issuer's initial public distribution. The aggregate voting power of the 422,533 shares of Common Stock is equal to 100% of the total voting power of the Issuer's Common Stock outstanding immediately following the initial public distribution.
Footnote F3
In addition to William A. Ackman, a citizen of the United States of America, this Form 4 is being filed jointly by Pershing Square Capital Management, L.P., a Delaware limited partnership ("Pershing Square"), and PSCM GP, LLC, a Delaware limited liability company ("PS Management" and collectively, the "Reporting Persons"), each of whom has the same business address as Pershing Square and may be deemed to have a pecuniary interest in securities reported on this Form 4 (the "Subject Securities").
Footnote F4
Pershing Square advises the accounts of Pershing Square, L.P., a Delaware limited partnership ("PSLP"), Pershing Square International, Ltd., a Cayman Islands exempted company ("PS International"), and Pershing Square Holdings, Ltd., a limited liability company incorporated in Guernsey ("PSH" and together with PSLP and PS International, the "Pershing Square Funds") and RedemptionCo. The Pershing Square Funds and RedemptionCo are the members of Pershing Square SPARC Sponsor, LLC, a Delaware limited liability company ("Sponsor"). Pershing Square is the non-member manager of the Sponsor. Pershing Square also advises PS SPARC I Master, L.P. ("SPARC Master LP").
Footnote F5
Pershing Square, as the investment adviser to the Pershing Square Funds and RedemptionCo, may be deemed to be the beneficial owner of the Subject Securities for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934. As the general partner of Pershing Square, PS Management may be deemed to be the beneficial owner of the Subject Securities for purposes of Rule 16a-1(a). By virtue of William A. Ackman's position as Chief Executive Officer of Pershing Square and as the managing member of PS Management, William A. Ackman may be deemed to be the beneficial owner of the Subject Securities for purposes of Rule 16a-1(a). Each of the Reporting Persons disclaims any beneficial ownership of any of the Subject Securities, except to the extent of any pecuniary interest therein.
Footnote F6
Reflects securities acquirable by the Pershing Square Funds in connection with that certain committed forward purchase agreement ("Committed Forward Purchase Agreement"), dated September 29, 2023, between the Issuer and the Pershing Square Funds. Pursuant to the Committed Forward Purchase Agreement, the Pershing Square Funds are obligated to purchase, in one or more private placements to occur simultaneously with the closing of the Issuer's business combination, at least $250,000,000 and up to $1,000,000,000 of common shares of the surviving entity of the Issuer's business combination based upon the final exercise price (the "Final Exercise Price") of the Issuer's subscription warrants, referred to as SPARs, which will be publicly announced in connection with the business combination and which will be at least $10.00.
Footnote F7
(Continued from Footnote 6) For purposes of this Form 4, the Reporting Persons have assumed a Final Exercise Price equal to $10.00 and therefore the Pershing Square Funds will be obligated to purchase 250,000 forward purchase shares ("Forward Purchase Shares") of the Issuer, at a price of $10.00 per Forward Purchase Share. The obligation of the Pershing Square Funds to purchase the Forward Purchase Shares may be allocated among the Pershing Square Funds from time to time. The Forward Purchase Shares will generally not be transferable, assignable or salable until 180 days after the consummation of the Issuer's business combination.
Footnote F8
Reflects securities acquirable by SPARC Master LP in connection with that certain additional forward purchase agreement ("Additional Forward Purchase Agreement"), dated September 29, 2023, between the Issuer and SPARC Master LP. Pursuant to the Additional Forward Purchase Agreement, SPARC Master LP has the right, but not the obligation, to purchase, in one or two tranches, a number of common shares of the surviving entity of the Issuer's business combination up to an amount equal to $3,500,000,000 less the amount obligated to be purchased by the Pershing Square Funds pursuant to the Committed Forward Purchase Agreement.
Footnote F9
(Continued from Footnote 8) For purposes of this Form 4, the Reporting Persons have assumed a Final Exercise Price equal to $10.00 and therefore the SPARC Master LP will have the right, but not the obligation, to purchase up to 3,250,000 additional forward purchase shares ("Additional Forward Purchase Shares") of the Issuer, at a price of $10.00 per Additional Forward Purchase Share. SPARC Master LP's right to purchase the Additional Forward Purchase Shares may be transferred, in whole or in part, to any entity that is managed by Pershing Square, but not to third parties. The Additional Forward Purchase Shares will generally not be transferable, assignable or salable until 180 days after the consummation of the Issuer's business combination.
Footnote F10
Prior to the Issuer's initial public distribution, Sponsor purchased, in a private placement, an aggregate of $35,892,480 of sponsor warrants ("Sponsor Warrants"), which will be exercisable, in the aggregate, for an amount of shares up to 4.95% of the outstanding shares (on a fully diluted basis) of the post-combination company, at a per share exercise price equal to 120% of the Final Exercise Price. The actual percentage of shares on a fully diluted basis into which the Sponsor Warrants are exercisable will be depend on and be decreased ratably in the event that (1) the aggregate funds raised at the closing of the business combination from the exercise of the SPARs and the amount purchased by SPARC Master LP pursuant to the Additional Forward Purchase Agreement, if any, is less than (2) the amount of funds that would have been raised if 100% of the issued SPARs had been exercised at the closing of the business combination.
Footnote F11
(Continued from Footnote 10) The Sponsor Warrants will generally not be transferable, assignable or salable until three years after the consummation of the Issuer's business combination, and expire 10 years after the date of the Issuer's business combination.