As filed with the Securities and Exchange Commission on July 7, 2026.

Registration No. 333-297043

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

AMENDMENT NO. 1

TO

FORM S-1

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

Professional Diversity Network, Inc.

(Exact name of registrant as specified in its charter)

Professional Diversity Network, Inc.

55 E. Monroe Street, Suite 2120

Chicago, Illinois 60603

(312) 614-0950

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

Xun Wu

Chief Executive Officer

Professional Diversity Network, Inc.

55 E. Monroe Street, Suite 2120

Chicago, Illinois 60603

(312) 614-0950

(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 the effective date of this Registration Statement.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, 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(c) 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. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an 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 the Securities Act. ☐

The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until the Registration Statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine.

EXPLANATORY NOTE

Professional Diversity Network, Inc. is filing this Amendment No. 1 (“Amendment”) to its Registration Statement on Form S-1 (File No. 333-297043) (the ‘‘Registration Statement”) solely to update the previously filed Exhibit 10.36. Accordingly, this Amendment consists only of the facing page, this explanatory note, Item 16(a) of Part II of the Registration Statement, the exhibit index to the Registration Statement, the signature page to the Registration Statement and the exhibit filed herewith. The prospectus, constituting Part I of the Registration Statement, is unchanged and therefore has been omitted from this filing.

PART II
INFORMATION NOT REQUIRED IN PROSPECTUS

Item 16. Exhibits and Financial Statement Schedules.

(a) Exhibits.

The exhibits listed below are filed as part of this registration statement.

* Previously filed.

** Filed herewith.

+ Indicates management contract or compensatory plan.

SIGNATURES

Pursuant to the requirements of the Securities Act, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Chicago, State of Illinois, on the 7th day of July 2026.

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement, as amended, has been signed by the following persons in the capacities held on the dates indicated.