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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 8-K
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934
DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED): May 26, 2026
MOLECULIN BIOTECH, INC.
(Exact Name of Registrant as Specified in its Charter)

Delaware | 001-37758 | 47-4671997
(State or Other Jurisdiction of Incorporation or Organization) | (Commission File No.) | (I.R.S. Employer Identification No.)

5300 Memorial Drive, Suite 950, Houston, TX 77007
(Address of principal executive offices and zip code)
(713) 300-5160
(Registrant’s telephone number, including area code)
(Former name or former address, if changed from last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-14(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐
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 13(a) of the Exchange Act. ☐
Securities registered pursuant to Section 12(b) of the Act:

Title of each class | Trading Symbol (s) | Name of each exchange on which registered
Common Stock, par value $.001 per share | MBRX | The NASDAQ Stock Market LLC

Item 7.01 | Regulation FD Disclosure

On May 26, 2026, Moleculin Biotech, Inc. (the “Company”) is using the attached presentation for its corporate presentation posted on the Company’s website and is set forth as Exhibit 99.1 herein.
The information contained in Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be “filed” for the purpose of the Securities Exchange Act of 1934, as amended (“Exchange Act”), nor shall it be incorporated by reference in any filing under the Exchange Act or the Securities Act of 1933, as amended (“Securities Act”), unless specifically identified therein as being incorporated by reference.

Item 9.01 | Financial Statements and Exhibits.

(d) | Exhibits.

Exhibit No. | Description
99.1 | Investor Presentation dated May 2026
104 | Cover page Interactive Data File (formatted as Inline XBRL document)

SIGNATURE
Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

| MOLECULIN BIOTECH, INC. |
| Date: | May 26, 2026 |
| By: | /s/ Jonathan P. Foster |
|  | Jonathan P. Foster |