SEC Form POS EX filed by AIB Acquisition Corporation

As filed with the Securities and Exchange Commission on February 17, 2026

Registration No. 333-291856

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

POST-EFFECTIVE AMENDMENT NO. 1

TO

FORM S-4
REGISTRATION STATEMENT UNDER
THE SECURITIES ACT OF 1933

BlockchAIn Digital Infrastructure, Inc.

(Exact name of registrant as specified in its charter)

1540 Broadway, Ste 1010

New York, NY 10036

(917) 558-3563

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Jerry Tang

Chief Executive Officer

1540 Broadway, Ste 1010

New York, NY 10036

(917) 558-3563

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Approximate date of commencement of proposed sale to the public: As soon as practicable after this registration statement is declared effective and all other conditions to the Business Combination Agreement described in the enclosed proxy statement/prospectus have been satisfied or waived.

If the securities being registered on this Form are being offered in connection with the formation of a holding company and there is compliance with General Instruction G, check the following box. ☐

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☒ 333-291856

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of Securities Act. ☐

If applicable, place an X in the box to designate the appropriate rule provision relied upon in conducting this transaction:

Exchange Act Rule 13e-4(i) (Cross-Border Issuer Tender Offer) ☐

Exchange Act Rule 14d-l(d) (Cross-Border Third-Party Tender Offer) ☐

EXPLANATORY NOTE

This Post-Effective Amendment No. 1 to Form S-4 amends the Registration Statement on Form S-4 of BlockchAIn Digital Infrastructure, Inc. (the “Registrant”) (Registration No. 333-291856), as amended prior to the date hereto (the “Registration Statement”), which was declared effective by the U.S. Securities and Exchange Commission on January 30, 2026.

This Post-Effective Amendment No. 1 is being filed for the purposes of replacing Exhibit 5.1: Opinion of Loeb & Loeb LLP and including Exhibit 23.3: Consent of Loeb & Loeb LLP (included in Exhibit 5.1). The Registration Statement is hereby amended, as appropriate, to reflect the replacement of such exhibits.

Item 21. Exhibits and Financial Statement Schedules

(a) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in New York, New York, on February 17, 2026.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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