Exhibit 1.1
TANG CAPITAL ACQUISITION CORP.
3,000,000 Ordinary Shares
Underwriting Agreement
October [●], 2026
LifeSci Capital LLC
As Representative of the
Underwriters listed
in Schedule 1 hereto
c/o LifeSci Capital LLC
1700 Broadway Avenue, 40th Floor
New York, New York 10019
c/o Raymond James & Associates, Inc.
880 Carillon Parkway
St. Petersburg, Florida 33716
Attention: General Counsel, GEIB
Ladies and Gentlemen:
Tang Capital Acquisition Corp., a Cayman Islands exempted company (the “Company”), proposes to issue and sell to the underwriters listed in Schedule 1 hereto (collectively, the “Underwriters”), for whom you are acting as representative (the “Representative”), an aggregate of 3,000,000 ordinary shares of the Company, par value $0.0001 per share (the “Shares”).
The Company has entered into an Investment Management Trust Agreement, effective as of the date hereof (the “Trust Agreement”), with Continental Stock Transfer & Trust Company, as trustee (the “Trustee”), in substantially the form filed as exhibit 10.1 to the Registration Statement, pursuant to which $25.00 per Share, or $75,000,000 in the aggregate, from the proceeds of the Offering will be deposited and held in a trust account (the “Trust Account”) for the benefit of the Company, the shareholders entitled to distributions under the Company’s amended and restated memorandum and articles of association, and the Underwriters only with respect to the Deferred Discount described below.
The Company has entered into a Securities Subscription Agreement, dated as of August 17, 2026 (the “Securities Subscription Agreement”), with Tang Capital Acquisition Holdings, LLC, a Cayman Islands limited liability company (the “Sponsor”), pursuant to which the Sponsor subscribed for 1,000 ordinary shares at $25.00 per share for an aggregate purchase price of $25,000. The 1,000 ordinary shares will be surrendered to the Company at the closing of the Offering, and the Sponsor will be entitled to receive $25,000 upon that surrender.
The Company has also entered into a Funding Agreement, dated as of August 17, 2026 (the “Funding Agreement” and, collectively with this Agreement, the Trust Agreement, and the Securities Subscription Agreement, the “Transaction Documents”), with the Sponsor, pursuant to which the Sponsor has agreed to pay expenses on the Company’s behalf prior to the Company’s initial business combination (the “Initial Business Combination”) as advances, reimbursable solely from permitted interest withdrawals from the Trust Account.
The Company hereby confirms its agreement with the Underwriters concerning the purchase and sale of the Shares, as follows:
1. Registration Statement. The Company has prepared and filed with the United States Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended, and the rules and regulations of the Commission thereunder (collectively, the “Securities Act”), a registration statement (File No. 333-299334), including a prospectus, relating solely to the Shares. Such registration statement, as amended at the time it became effective,