Sec Form 3 Filing - BARCLAYS PLC @ Launch One Acquisition Corp. - 2024-07-15

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person BARCLAYS PLC 2. Issuer Name and Ticker or Trading Symbol Launch One Acquisition Corp. [ LPAAU] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 1 CHURCHILL PLACE, CANARY WHARF 3. Date of Earliest Transaction (MM/DD/YY) 07/15/2024 (Street) LONDON, X0E14 5HP 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A ordinary shares, par value $0.0001 per share 2,405,000 I Barclays Bank PLC

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Redeemable Warrant $ 11.5 08/14/2026 07/14/2031 Class A ordinary shares, par value $0.0001 per share 1,202,500 I Barclays Bank PLC

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other BARCLAYS PLC 1 CHURCHILL PLACE CANARY WHARF LONDON, X0E14 5HP X Signatures Suejean Mott 07/18/2024 Signature of Reporting Person Date

Explanation of Responses:

Remarks: (a) Beneficially owned Class A ordinary shares and redeemable warrants are comprised in Units, each consisting of one class A ordinary share and one-half of one redeemable warrant(b) Name of Person Filing:(1) Barclays PLC(2) Barclays Bank PLC (controlled by Barclays PLC)(c) Address of Principal Business Office or, if non, Residence:(1) Barclays PLC1 Churchill PlaceLondon, E14 5HP, England(2) Barclays Bank PLC1 Churchill PlaceLondon, E14 5HP, England(d) The redeemable warrants will become exercisable on the later of 30 days after the completion of the issuer's initial business combination. The redeemable warrants will expire five years after the completion of the issuer's initial business combination or earlier upon redemption by or liquidation of the issuer, as described in the prospectus for the issuer's initial public offering.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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