person · Reporting owner

dMY Squared Sponsor, LLC

Disclosed activity across 1 company

Tapewire entity: 56822
SEC CIK: 0001915397

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Reported relationships

Latest disclosed role at each company.

No relationships currently tracked through insider filings.

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

No balances currently tracked through insider filings.

Past disclosures · reporting ended (1)

No longer tracked through insider filings. These historical balances do not imply present ownership or a zero position.

dMY Squared Technology Group, Inc.

Report date March 19, 2026 · Filed March 20, 2026

Jointly reported with You Harry L.

Section 16 reporting ended · disclosed 2026-03-20. Current position is not established by this disclosure.

Security / award	Ownership account	Disclosed shares / units	Disclosure context
Class A Common StockSEC Table I · non-derivative	Direct	1,163,484	Reported balance After 2026-03-19 transaction · row 1 Joint disclosure: continuity of the reported position is unresolved; see ownership footnotes. 1 source row Row 1 · 2026-03-19 · Conversion · Acquired 1,163,484 · Balance 1,163,484 F2: In connection with and immediately prior to the closing of the business combination ("Business Combination") between dMY Squared Technology Group, Inc., Horizon Quantum Computing Pte. Ltd., and Horizon Quantum Holdings Ltd., all of the outstanding shares of Class B Common Stock were converted on a one-for-one basis into shares of Class A Common Stock in accordance with the issuer's Amended and Restated Articles of Organization. F3: dMY Squared Sponsor, LLC (the "Sponsor") Sponsor is the record holder of the securities reported herein. Harry L. You is the managing member of the Sponsor and has voting and investment discretion with respect to the securities held of record by the Sponsor. Each of the Sponsor and Mr. You is a "Reporting Person" and may be deemed to beneficially own the securities reported herein; however, each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein. Solely for purposes of Section 16 of the Exchange Act, each Reporting Person may be deemed a "director by deputization".
Class B Common StockSEC Table II · derivative / convertible security	Direct	0	Reported balance After 2026-03-19 transaction · row 2 Instrument identity requires review; Table II rows are not merged. 1 source row Row 2 · 2026-03-19 · Conversion · Disposed 1,163,484 · Balance 0 F1: The shares of Class B common stock, par value $0.0001 per share ("Class B Common Stock"), are convertible into shares of the issuer's Class A common stock, par value $0.0001 per share ("Class A Common Stock"), at the holder's election at any time and automatically at the time of the closing of the issuer's initial business combination, on a one-for-one basis, subject to adjustment pursuant to certain antidilution rights and have no expiration date. F2: In connection with and immediately prior to the closing of the business combination ("Business Combination") between dMY Squared Technology Group, Inc., Horizon Quantum Computing Pte. Ltd., and Horizon Quantum Holdings Ltd., all of the outstanding shares of Class B Common Stock were converted on a one-for-one basis into shares of Class A Common Stock in accordance with the issuer's Amended and Restated Articles of Organization. F3: dMY Squared Sponsor, LLC (the "Sponsor") Sponsor is the record holder of the securities reported herein. Harry L. You is the managing member of the Sponsor and has voting and investment discretion with respect to the securities held of record by the Sponsor. Each of the Sponsor and Mr. You is a "Reporting Person" and may be deemed to beneficially own the securities reported herein; however, each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein. Solely for purposes of Section 16 of the Exchange Act, each Reporting Person may be deemed a "director by deputization".

Filing footnotes · ownership attribution and instrument terms

F1: The shares of Class B common stock, par value $0.0001 per share ("Class B Common Stock"), are convertible into shares of the issuer's Class A common stock, par value $0.0001 per share ("Class A Common Stock"), at the holder's election at any time and automatically at the time of the closing of the issuer's initial business combination, on a one-for-one basis, subject to adjustment pursuant to certain antidilution rights and have no expiration date.

F2: In connection with and immediately prior to the closing of the business combination ("Business Combination") between dMY Squared Technology Group, Inc., Horizon Quantum Computing Pte. Ltd., and Horizon Quantum Holdings Ltd., all of the outstanding shares of Class B Common Stock were converted on a one-for-one basis into shares of Class A Common Stock in accordance with the issuer's Amended and Restated Articles of Organization.

F3: dMY Squared Sponsor, LLC (the "Sponsor") Sponsor is the record holder of the securities reported herein. Harry L. You is the managing member of the Sponsor and has voting and investment discretion with respect to the securities held of record by the Sponsor. Each of the Sponsor and Mr. You is a "Reporting Person" and may be deemed to beneficially own the securities reported herein; however, each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein. Solely for purposes of Section 16 of the Exchange Act, each Reporting Person may be deemed a "director by deputization".

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction date	Company	Activity / security	Shares / units	Reported price	Reported value	Details
March 19, 2026 Filed Mar 20, 2026 20:20 UTC	dMY Squared Technology Group, Inc. DMYY · Entity 56821	ConversionClass B Common Stock · Derivative	1,163,484	$0.00	$0.00	Disclosure SEC source: 0001829126-26-002583 · ownership.xml · derivative · entry 2 dMY Squared Sponsor, LLC · CIK 0001915397 · Director · 10% owner You Harry L. · CIK 0001432602 · Director · CEO, CFO & Chairman · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 0 Underlying: Class A Common Stock · 1,163,484 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · derivative.exercise_price: The shares of Class B common stock, par value $0.0001 per share ("Class B Common Stock"), are convertible into shares of the issuer's Class A common stock, par value $0.0001 per share ("Class A Common Stock"), at the holder's election at any time and automatically at the time of the closing of the issuer's initial business combination, on a one-for-one basis, subject to adjustment pursuant to certain antidilution rights and have no expiration date. F2 · kind: In connection with and immediately prior to the closing of the business combination ("Business Combination") between dMY Squared Technology Group, Inc., Horizon Quantum Computing Pte. Ltd., and Horizon Quantum Holdings Ltd., all of the outstanding shares of Class B Common Stock were converted on a one-for-one basis into shares of Class A Common Stock in accordance with the issuer's Amended and Restated Articles of Organization. F1 · derivative.exercise_date: The shares of Class B common stock, par value $0.0001 per share ("Class B Common Stock"), are convertible into shares of the issuer's Class A common stock, par value $0.0001 per share ("Class A Common Stock"), at the holder's election at any time and automatically at the time of the closing of the issuer's initial business combination, on a one-for-one basis, subject to adjustment pursuant to certain antidilution rights and have no expiration date. F1 · derivative.expiration_date: The shares of Class B common stock, par value $0.0001 per share ("Class B Common Stock"), are convertible into shares of the issuer's Class A common stock, par value $0.0001 per share ("Class A Common Stock"), at the holder's election at any time and automatically at the time of the closing of the issuer's initial business combination, on a one-for-one basis, subject to adjustment pursuant to certain antidilution rights and have no expiration date. F3 · ownership.direct: dMY Squared Sponsor, LLC (the "Sponsor") Sponsor is the record holder of the securities reported herein. Harry L. You is the managing member of the Sponsor and has voting and investment discretion with respect to the securities held of record by the Sponsor. Each of the Sponsor and Mr. You is a "Reporting Person" and may be deemed to beneficially own the securities reported herein; however, each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein. Solely for purposes of Section 16 of the Exchange Act, each Reporting Person may be deemed a "director by deputization". Read SEC document
March 19, 2026 Filed Mar 20, 2026 20:20 UTC	dMY Squared Technology Group, Inc. DMYY · Entity 56821	ConversionClass A Common Stock	1,163,484	Not disclosed	Not disclosed	Disclosure SEC source: 0001829126-26-002583 · ownership.xml · nonDerivative · entry 1 dMY Squared Sponsor, LLC · CIK 0001915397 · Director · 10% owner You Harry L. · CIK 0001432602 · Director · CEO, CFO & Chairman · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,163,484 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · kind: In connection with and immediately prior to the closing of the business combination ("Business Combination") between dMY Squared Technology Group, Inc., Horizon Quantum Computing Pte. Ltd., and Horizon Quantum Holdings Ltd., all of the outstanding shares of Class B Common Stock were converted on a one-for-one basis into shares of Class A Common Stock in accordance with the issuer's Amended and Restated Articles of Organization. F2 · price: In connection with and immediately prior to the closing of the business combination ("Business Combination") between dMY Squared Technology Group, Inc., Horizon Quantum Computing Pte. Ltd., and Horizon Quantum Holdings Ltd., all of the outstanding shares of Class B Common Stock were converted on a one-for-one basis into shares of Class A Common Stock in accordance with the issuer's Amended and Restated Articles of Organization. F3 · ownership.direct: dMY Squared Sponsor, LLC (the "Sponsor") Sponsor is the record holder of the securities reported herein. Harry L. You is the managing member of the Sponsor and has voting and investment discretion with respect to the securities held of record by the Sponsor. Each of the Sponsor and Mr. You is a "Reporting Person" and may be deemed to beneficially own the securities reported herein; however, each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein. Solely for purposes of Section 16 of the Exchange Act, each Reporting Person may be deemed a "director by deputization". Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:15 UTC	dMY Squared Technology Group, Inc. DMYY · Entity 56821	OtherClass B Common Stock · Derivative	416,266	$0.00	$0.00	Disclosure SEC source: 0001829126-25-007450 · ownership.xml · derivative · entry 1 dMY Squared Sponsor, LLC · CIK 0001915397 · Director · 10% owner You Harry L. · CIK 0001432602 · Director · CEO, CFO & Chairman · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,163,484 Underlying: Class A Common Stock · 416,266 shares Expires not disclosed F1 · derivative.exercise_price: The shares of Class B common stock, par value $0.0001 per share, are convertible for shares of the issuer's Class A common stock, par value $0.0001 per share, at the holder's election at any time and automatically at the time of the closing of the issuer's initial business combination, on a one-for-one basis, subject to adjustment pursuant to certain antidilution rights and have no expiration date. F2 · kind: dMY Squared Sponsor, LLC (the "Sponsor") distributed these shares to one of its members, pro rata, for no consideration. F1 · derivative.exercise_date: The shares of Class B common stock, par value $0.0001 per share, are convertible for shares of the issuer's Class A common stock, par value $0.0001 per share, at the holder's election at any time and automatically at the time of the closing of the issuer's initial business combination, on a one-for-one basis, subject to adjustment pursuant to certain antidilution rights and have no expiration date. F1 · derivative.expiration_date: The shares of Class B common stock, par value $0.0001 per share, are convertible for shares of the issuer's Class A common stock, par value $0.0001 per share, at the holder's election at any time and automatically at the time of the closing of the issuer's initial business combination, on a one-for-one basis, subject to adjustment pursuant to certain antidilution rights and have no expiration date. F3 · ownership.direct: The Sponsor is the record holder of the securities reported herein. Harry L. You is the managing member of the Sponsor and has voting and investment discretion with respect to the securities held of record by the Sponsor. Each of the Sponsor and Mr. You is a "Reporting Person" and may be deemed to beneficially own the securities reported herein; however, each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein. Solely for purposes of Section 16 of the Exchange Act, each Reporting Person may be deemed a "director by deputization". Read SEC document
September 29, 2022 Filed Sep 30, 2022 20:19 UTC	dMY Squared Technology Group, Inc. DMYY · Entity 56821	PurchaseClass B Common Stock · Derivative	431,250	Not disclosed	Not disclosed	Disclosure SEC source: 0000899243-22-032303 · doc4.xml · derivative · entry 1 dMY Squared Sponsor, LLC · CIK 0001915397 · 10% owner 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 1,725,000 Underlying: Class A Common Stock · 431,250 shares Expires not disclosed F1 · derivative.exercise_price: The shares of Class B common stock are convertible for shares of the issuer's Class A common stock as described under the heading "Description of Securities" in the issuer's Registration Statement on Form S-1 (File No. 333-267381)(the "Registration Statement") and have no expiration date. F1 · price: The shares of Class B common stock are convertible for shares of the issuer's Class A common stock as described under the heading "Description of Securities" in the issuer's Registration Statement on Form S-1 (File No. 333-267381)(the "Registration Statement") and have no expiration date. F1 · derivative.exercise_date: The shares of Class B common stock are convertible for shares of the issuer's Class A common stock as described under the heading "Description of Securities" in the issuer's Registration Statement on Form S-1 (File No. 333-267381)(the "Registration Statement") and have no expiration date. F1 · derivative.expiration_date: The shares of Class B common stock are convertible for shares of the issuer's Class A common stock as described under the heading "Description of Securities" in the issuer's Registration Statement on Form S-1 (File No. 333-267381)(the "Registration Statement") and have no expiration date. F2 · balance_after: Adjusted to reflect the forfeiture of 431,250 shares of Class B common stock by dMY Squared Sponsor, LLC on September 29, 2022 as further described in the Issuer's Form 8-K filed on September 30, 2022 and the Exhibit 10.1 thereto. The shares of Class B common stock beneficially owned by the Reporting Person includes up to 225,000 shares of Class B common stock subject to forfeiture to the Issuer depending on the extent to which the underwriters' over-allotment option is exercised in connection with the Issuer's initial public offering of units, as described in the Registration Statement. F3 · ownership.direct: dMY Squared Sponsor, LLC is the record holder of the securities reported herein. Harry L. You is the manager of dMY Squared Sponsor, LLC and has voting and investment discretion with respect to the securities held of record by dMY Squared Sponsor, LLC. Read SEC document

Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.