Sec Form 4 Filing - Neithardt David William @ OTR Acquisition Corp. - 2022-05-19

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 Neithardt David William 2. Issuer Name and Ticker or Trading Symbol OTR Acquisition Corp. [ OTRA] 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) 6705 SW 57TH AVENUE, SUITE 700 3. Date of Earliest Transaction (MM/DD/YY) 05/19/2022 (Street) CORAL GABLES, FL33143 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 Common Stock 05/19/2022 C 157,287 A 157,287 I See Footnote( 3 ) Class A Common Stock 05/19/2022 J 157,287 D 0 I See Footnote( 3 )

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 Class B Common Stock ( 1 )( 2 ) 05/19/2022 C 157,287 ( 1 )( 2 ) ( 1 )( 2 ) Class A Common Stock 157,287 ( 1 )( 2 ) 0 I See Footnote( 3 ) Warrant ( 5 ) 05/19/2022 J 784,212 ( 6 ) ( 6 ) Class A Common Stock 784,212 ( 5 ) 0 I See Footnote( 3 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Neithardt David William 6705 SW 57TH AVENUE, SUITE 700 CORAL GABLES, FL33143 X Signatures /s/ David William Neithardt 05/19/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )As described in the issuer's registration statement on Form S-1 (File No. 333-248093) (the "Registration Statement") under the heading "Description of Securities," the shares of Class B common stock, par value $0.0001 per share ("Class B Stock"), automatically convert into shares of Class A common stock, par value $0.0001 per share ("Class A Stock"), at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for stock splits, stock dividends, reorganizations, recapitalizations and the like, and certain anti-dilution rights and has no expiration date. ( 2 )(Continued from Footnote 1) On May 19, 2022, the issuer consummated its initial business combination (the "Business Combination") with Comera Life Sciences Holdings, Inc.. ("Holdco"), a Delaware corporation. In connection with the Business Combination, each share of Class B Stock converted into Class A Stock. ( 3 )The reporting person is the manager of Hammock Park Capital LLC. Beaumont Irrevocable Trust, of which the reporting person is a Trustee, owns 100% of Hammock Park Capital LLC. As such, the reporting person may be deemed to have beneficial ownership of such shares. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly. ( 4 )In connection with the Business Combination, the reporting person exchanged its Class A Shares for 157,287 fully paid and non-assessable shares of common stock, par value U.S. $0.0001 per share, of Holdco Common Stock. ( 5 )In connection with the Business Combination, the reporting person exchanged each of its warrants to purchase shares of Class A Stock on a one for one basis for an aggregate of 784,212 warrants to purchase shares of Holdco Common Stock at a purchase price of $11.50 per share. ( 6 )The warrants were not exercisable until 30 days after the issuer's initial business combination and would have expired five years from the consummation of the issuer's initial business combination.

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