Imperial Petroleum Inc./Marshall Islands

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON D.C. 20549

FORM

20-F

OR

For the fiscal year ended December 31,2025

OR

OR

Commission file number

001-41095

IMPERIAL PETROLEUM INC.

(Exact name of Registrant as specified in its charter)

Not applicable

(Translation of Registrant’s Name into English)

Republic of the Marshall Islands

(Jurisdiction of incorporation or organization)

331 Kifissias Avenue, Kifissia 14561 Athens, Greece

(Address of principal executive offices)

Harry N. Vafias

331 Kifissias Avenue, Kifissia 14561, Athens, Greece

Telephone: (011) (30) (210)625 0001

Facsimile: (011) (30) (210) 625 0018

(Name, Telephone,

E-mail

and/or Facsimile Number and Address of Company Contact

Person

)

SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

None

SECURITIES FOR WHICH THERE IS A REPORTING OBLIGATION

PURSUANT TO SECTION 15(d) OF THE ACT:

None

T

he number of outstanding shares of each of the issuer’s classes of capital or common stock as of December 31, 2025 was:44,648,737 shares of Common Stock, par value $0.01 per share, and 795,878 shares of 8.75% Series A Cumulative Redeemable Perpetual Preferred Stock, par value $0.01 per share, and 16,000 shares of Series B Preferred Stock, par value $0.01 per share.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. ☐ Yes ☒No

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. ☐ Yes ☒No

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. ☒

Yes

☐ No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation

S-T

(§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). ☒Yes ☐ No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a

non-accelerated

filer or an emerging growth company. See the definitions of “large accelerated filer”, “accelerated filer” and “emerging growth company” in Rule

12b-2

of the Exchange Act.

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, 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.☒

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report: ☐ Yes☒ No

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements.☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to

§240.10D-1(b). ☐

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:

If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow. ☐ Item 17 ☐ Item 18

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule

12b-2

of the Exchange Act). ☐ Yes☒ No