Sec Form 4 Filing - Mosolf Joerg @ Spectaire Holdings Inc. - 2023-10-19

FORM 4 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 Mosolf Joerg 2. Issuer Name and Ticker or Trading Symbol Spectaire Holdings Inc. [ SPEC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 155 ARLINGTON ST. 3. Date of Earliest Transaction (MM/DD/YY) 10/19/2023 (Street) WATERTOWN, MA02472 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 Common Stock 10/19/2023 A( 1 ) 43,375 ( 2 ) A 43,375 D Common Stock 10/19/2023 A 50,000 A $ 10 93,375 D Common Stock 10/19/2023 J( 1 ) 1,935,944 A 1,935,944 I By MLabCapital GmbH

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 Earnout Rights ( 3 ) 10/19/2023 A( 1 ) 29,614 ( 3 ) ( 3 ) Common Stock 29,614 ( 1 ) 29,614 D Earnout Rights ( 3 ) 10/19/2023 J( 1 ) 1,237,177 ( 3 ) ( 3 ) Common Stock 1,237,177 ( 1 ) 1,237,177 I By MLabCapital GmbH

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Mosolf Joerg 155 ARLINGTON ST. WATERTOWN, MA02472 X Signatures /s/ Leonardo Fernandes 10/23/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents securities received as part of the Issuer's business combination, in connection with that certain Agreement and Plan of Merger, dated as of January 16, 2023 (the "Merger Agreement"), by and between the Issuer (formerly, Perception Capital Corp. II), Perception Spectaire Merger Sub Corp. and Spectaire, Inc. ("Legacy Spectaire"), pursuant to which share of common stock of Legacy Spectaire automatically converted into the right to receive (i) cash and Common Stock of the Issuer and (ii) the right to receive Earnout Shares (as defined below). Pursuant to the Merger Agreement, each unvested award of restricted stock units of Legacy Spectaire automatically converted into the right to receive (i) securities of the Issuer with the same terms and conditions and (ii) the right to receive Earnout Shares, which will be subject to the reporting person's continued service to the Issuer. ( 2 )Includes 39,761 restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's Common Stock and does not expire. ( 3 )Each earnout right represents a contingent right to receive one share of the Issuer's Common Stock (the "Earnout Share") upon the satisfaction of certain price thresholds. Pursuant to an "earnout" provision in the Merger Agreement, the Earnout Shares may be issued in three equal tranches upon the volume-weighted price per share of the Issuer's Common Stock equaling or exceeding $15.00, $20.00 or $25.00 for at least 20 trading days in any consecutive 30-day trading period within the five-year period following the closing of the Issuer's business combination.

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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