GT Biopharma, Inc.

Regulatory Filings • Nov 14, 2025

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report: November 14, 2025

(Date of earliest event reported)

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GT Biopharma, Inc.

(Exact name of registrant as specified in its charter)

Delaware

(State or other Jurisdiction of Incorporation)

1-40023	94-1620407
(Commission File Number)	(IRS Employer Identification No.)

N/A 1

(Address of Principal Executive Offices and zip code)

(415) 919-4040

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of registrant under any of the following provisions:

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

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, $0.001 par value | GTBP | The
Nasdaq Stock Market LLC |

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. ☐

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1 Effective as of July 1, 2024, the Company became a fully remote company. We do not maintain a principal executive office. For purposes of compliance with applicable requirements of the Securities Act of 1933, as amended, and the Securities Exchange Act of 1934, as amended, any stockholder communication required to be sent to the Company’s principal executive offices may be directed to 505 Montgomery Street , 10th Floor , San Francisco , California 94111 , or by email to auditcommittee@gtbiopharma.com.

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Item 2.02 Results of Operations and Financial Condition.

On November 14, 2025, GT Biopharma, Inc. issued a press release announcing its financial results for its fiscal quarter ended September 30, 2025. A copy of the press release is furnished as Exhibit 99.1.

The information furnished under this Item 2.02, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit Number	Description
99.1	Press
Release issued by GT Biopharma, Inc. on November 14, 2025
104	Cover
Page Interactive Data File, formatted in Inline XBRL

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SIGNATURES

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

| /s/
Alan Urban |
| --- |
| Alan
Urban |
| Chief
Financial Officer |

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