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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
December 4, 2025
Date of Report (Date of earliest event reported)
ETON PHARMACEUTICALS, INC.
(Exact name of registrant as specified in its charter)

Delaware |  | 001-38738 |  | 37-1858472
(State |  | (Commission |  | (I.R.S. Employer
of incorporation) |  | File Number) |  | Identification Number)

| 21925 W. Field Parkway, Suite 235 |
| Deer Park, Illinois 60010-7208 |
| (Address of principal executive offices) (Zip code) |
| (847) 787-7361 |
| (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 the 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 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
Common Stock, par value $0.001 per share |  | ETON |  | NASDAQ Global Market

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. ☐

Item 7.01 Regulation FD Disclosure.
On December 4, 2025, members of the Eton Pharmaceuticals, Inc. management team will be attending the Piper Sandler Annual Healthcare Conference in New York, NY, and will present the corporate slide presentation attached as Exhibit 99.1 to this Current Report on Form 8-K, which is incorporated herein by reference, at the conference as well in meetings with investors and other parties during the conference.
The information contained in Item 7.01 of this report and in Exhibit 99.1 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

Exhibit 99.1 |  | Eton Pharmaceuticals, Inc. Corporate Presentation dated December 4, 2025
104 |  | Cover Page Interactive Data File (embedded within the Inline XBRL document)

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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.

Date: December 4, 2025 | By: | /s/ James R. Gruber
|  | James R. Gruber
|  | Chief Financial Officer and Secretary
|  | (Principal Financial Officer)

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