[6-K] Imperial Petroleum Inc./Marshall Islands Current Report (Foreign Issuer)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of December 2025

Commission File Number 001-41095

IMPERIAL PETROLEUM INC.

(Translation of registrant’s name into English)

331 Kifissias Avenue, Erithrea 14561 Athens, Greece

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒   Form  40-F ☐

INFORMATION CONTAINED IN THIS FORM 6-K REPORT

Attached to this report on Form 6-K as Exhibit 99.1 is a copy of the press release of Imperial Petroleum Inc. dated December 11, 2025, announcing its unaudited financial and operating results for the three and nine months ended September 30, 2025.

EXHIBIT INDEX

99.1 Imperial Petroleum Inc. Press Release dated December 11, 2025

*****

This report on Form 6-K, including exhibit 99.1 hereto (other than the section entitled “CEO Harry Vafias Commented:”), is hereby incorporated by reference into the Company’s Registration Statement on Form F-3 (Reg. No. 333-268663), Post Effective Amendment No. 1 to Form F-1 on Form F-3 Registration Statement (Reg. No. 333-266031) and Registration Statements on Form S-8 (Reg. Nos. 333-275745 and 333-278813), including the prospectuses contained therein.

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, thereunto duly authorized.

Date: December 12, 2025

IMPERIAL PETROLEUM INC.
By:		/s/ Ifigenia Sakellari
Name:		Ifigenia Sakellari
Title:		Chief Financial Officer

FAQ

What did Imperial Petroleum Inc. (IMPP) disclose in this report?

Imperial Petroleum Inc. attached a press release that announces its unaudited financial and operating results for the three and nine months ended September 30, 2025.

Which periods do Imperial Petroleum’s latest unaudited results cover?

The press release included with the report presents unaudited financial and operating results for the three and nine months ended September 30, 2025.

How are Imperial Petroleum’s unaudited results being communicated to investors?

The company is providing these figures through a press release dated December 11, 2025, which is attached to the report as Exhibit 99.1.

Are the financial results Imperial Petroleum reported audited or unaudited?

The report specifies that Imperial Petroleum is announcing unaudited financial and operating results for the covered three- and nine-month periods.

How does this report affect Imperial Petroleum’s existing registration statements?

The report, including Exhibit 99.1 but excluding the CEO commentary section, is incorporated by reference into Imperial Petroleum’s Form F-3, a post-effective amendment on Form F-3, and its Form S-8 registration statements.

Is the CEO’s commentary included in the information incorporated into the registration statements?

No. The report states that it is incorporated by reference into those registration statements other than the section entitled “CEO Harry Vafias Commented:”.

Who signed this report on behalf of Imperial Petroleum Inc.?

The report was signed on behalf of Imperial Petroleum Inc. by Ifigenia Sakellari, who is identified as the company’s Chief Financial Officer.