OTRA OTR Acquisition Corporation

As of May 17, 2022, holders of an aggregate of 9,769,363 shares of Class A Common Stock (the “Common Stock”), out of the 10,447,350 shares of Common Stock subject to redemption, of OTR Acquisition Corp., a Delaware corporation (the “Company”) have redeemed their shares of Common Stock in connection with the proposed business combination with Comera Life Sciences, Inc (“Comera”) (the “Business Combination”). The Company is no longer allowing holders of Common Stock to reverse their election to have their shares of Common Stock redeemed. As a result, there are 677,987 shares of Common Stock outstanding that were subject to redemption but not redeemed.

The Company anticipates that the closing of the Business Combination will occur on or before May 19, 2022, subject to the satisfaction or waiver of all of the requirements to closing.

Important Information About the Proposed Business Combination and Where to Find It

In connection with the proposed Business Combination, Comera Life Sciences Holdings, Inc. (“Holdco”) filed the Registration Statement which includes a proxy statement of the Company and a prospectus of Holdco, which registration statement was declared effective by the SEC on April 11, 2022. The definitive proxy statement/prospectus was sent to all Company and Comera stockholders. Holdco and the Company will also file other documents regarding the proposed Business Combination with the SEC. Before making any voting decision, investors and securities holders of the Company and Comera are urged to read the proxy statement/prospectus and all other relevant documents filed or that will be filed with the SEC in connection with the proposed Business Combination as they become available because they contain or will contain important information about the proposed Business Combination and the parties to the proposed Business Combination.

Investors and securities holders may obtain free copies of the proxy statement/prospectus and all other relevant documents filed or that will be filed with the SEC by Holdco through the website maintained by the SEC at https://sec.gov/. In addition, the documents filed by the Company may be obtained free of charge from the Company’s website at https://otracquisition.com/investors/ or by written request to OTR Acquisition Corp., 1395 Brickell Avenue, Suite 800, Miami, Florida 33131.

Participants in the Solicitation

Holdco, the Company and Comera and their respective directors and officers may be deemed to be participants in the solicitation of proxies from the Company’s stockholders in connection with the proposed Business Combination. Information about the Company’s directors and executive officers and their ownership of the Company’s securities is set forth in the Company’s filings with the SEC, including the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2021, which was filed with the SEC on March 8, 2022. To the extent that holdings of the Company’s securities have changed since the amounts printed in the Company’s Annual Report, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC. Additional information regarding the interests of those persons and other persons who may be deemed participants in the proposed Business Combination may be obtained by reading the proxy statement/prospectus regarding the proposed Business Combination. You may obtain free copies of these documents as described in the preceding paragraph.