[8-K] Protagenic Therapeutics, Inc.new Reports Material Event

Rhea-AI Filing Summary

Protagenic Therapeutics (PTIX) reported a board change: director Jennifer Chao resigned, effective November 3, 2025. The company stated there were no disagreements between Ms. Chao and the company. This is a routine governance update disclosed under a change in directors or certain officers.

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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): November 3, 2025

PROTAGENIC THERAPEUTICS, INC.

Protagenic Therapeutics, Inc.\new

(Exact name of Company as specified in its charter)

Delaware		001-12555		06-1390025
(State or other jurisdiction of incorporation)		(Commission File Number)		(I.R.S. Employer Identification No.)

149 Fifth Avenue, Suite 500, New York, NY		10010
(Address of principal executive offices)		(Zip Code)

212-994-8200

(Company’s telephone number, including area code)

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the Company 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 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-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
Protagenic Therapeutics, Inc. Common Stock		PTIX		Nasdaq
Protagenic Therapeutics, Inc. Common Stock Warrants		PTIXW		Nasdaq

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.

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. ☐

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On November 3, 2025, Jennifer Chao resigned from the Board of Directors of Protagenic Therapeutics, Inc. (the “Company”), effective immediately. There were no disagreements between Ms. Chao and the Company.

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.

	PROTAGENIC THERAPEUTICS, INC.
Date: November 5, 2025	By:	/s/ Alexander K. Arrow
	Name:	Alexander K. Arrow
	Title:	Chief Financial Officer

FAQ

What did PTIX disclose in this 8-K?

PTIX reported that director Jennifer Chao resigned from the Board of Directors, effective November 3, 2025.

When was the resignation of Jennifer Chao effective at PTIX?

The resignation was effective on November 3, 2025.

Did PTIX report any disagreements related to the resignation?

The company stated there were no disagreements between Ms. Chao and the company.

What section of the report covers this change at PTIX?

The disclosure appears under Item 5.02 (Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements).

Which exchange lists PTIX securities?

PTIX common stock and warrants are listed on Nasdaq.