Sec Form 13D Filing - You Harry L. filing for - 2026-03-20

Insider filing report for Changes in Beneficial Ownership

  • Schedule 13G & 13D forms are used to report a party's ownership of stock which exceeds 5% of a company's total stock issue.
  • Schedule 13G is a shorter version of Schedule 13D with fewer reporting requirements.
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If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. Checkbox not checked

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).




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SCHEDULE 13D



Comment for Type of Reporting Person:
Note to Row 7, 9 and 11: Includes (i) 49,214 Class A ordinary shares ("Class A Ordinary Shares"), of Horizon Quantum Holdings Ltd. (the "Issuer") held directly by Mr. You, (ii) 1,163,484 Class A Ordinary Shares held by dMY Squared Sponsor, LLC ("dMY Sponsor"), a limited liability company of which Mr. You is the sole member, and (iii) 2,884,660 Class A Ordinary Shares issuable upon the exercise of warrants of the Issuer that are held by dMY Sponsor, which warrants become exercisable beginning 30 days after March 19, 2026. Note to Row 13: Based on an aggregate of 31,882,764 Class A Ordinary Shares outstanding as of March 19, 2026 according to records of the Issuer. In computing the number of shares beneficially owned by a person and the percentage ownership of that person, all shares subject to options held by such person were deemed outstanding if such options are currently vested or will vest within 60 days of the date of this report. These shares were not deemed outstanding, however, for the purpose of computing the percentage ownership of any other person.


SCHEDULE 13D



Comment for Type of Reporting Person:
Note to Row 7, 9 and 11: Includes (i) 1,163,484 Class A Ordinary Shares held by dMY Sponsor, a limited liability company of which Mr. You is the sole member, and (ii) 2,884,660 Class A Ordinary Shares issuable upon the exercise of warrants of the Issuer that are held by dMY Sponsor, which warrants become exercisable beginning 30 days after March 19, 2026. Note to Row 13: Based on an aggregate of 31,882,764 Class A Ordinary Shares outstanding as of March 19, 2026 according to records of the Issuer. In computing the number of shares beneficially owned by a person and the percentage ownership of that person, all shares subject to options held by such person were deemed outstanding if such options are currently vested or will vest within 60 days of the date of this report. These shares were not deemed outstanding, however, for the purpose of computing the percentage ownership of any other person.


SCHEDULE 13D

 
Harry L. You
 
Signature:/s/ Harry L. You
Name/Title:Harry L. You, Self
Date:03/20/2026
 
dMY Squared Sponsor, LLC
 
Signature:/s/ Harry L. You
Name/Title:Harry L. You, Managing Member
Date:03/20/2026
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