OTR Acquisition Sponsor LLC - 20 May 2022 Form 4 Insider Report for OTR Acquisition Corp.

Role: 10%+ Owner
Signature: /s/ Nicholas J. Singer
Issuer symbol: N/A
Transactions as of: 20 May 2022
Net transactions value: $0
Form type: 4
Filing time: 20 May 2022, 16:35:50 UTC
Previous filing: 10 May 2022
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	OTRA	Class A Common Stock	Conversion of derivative security		+1,305,918			1,305,918	20 May 2022	Direct	F1, F2
transaction	OTRA	Class A Common Stock	Other		-1,305,918	-100%		0	20 May 2022	Direct	F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	OTRA	Class B Common Stock	Conversion of derivative security	$0	-1,305,918	-100%	$0.000000^*	0	20 May 2022	Class A Common Stock	1,305,918		Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	As described in the OTR Acquisition Corp.'s registration statement on Form S-1 (File No. 333-248093) under the heading "Description of Securities," the Class B common stock of the issuer automatically converts into Class A common stock of the issuer ("Class A Common Stock") at the time of the issuer's initial business combination or earlier at the option of the holders thereof, on a one-for-one basis, subject to certain adjustments described therein, and have no expiration date.
F2	(Continued from Footnote 1) On May 20, 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 Common Stock converted into Class A Common Stock.
F3	In connection with the Business Combination, the reporting person exchanged its shares of Class A Common Stock for 1,305,918 fully paid and non-assessable shares of common stock, par value U.S. $0.0001 per share, of Holdco.