Filed Pursuant to Rule 424(b)(3)

Registration No. 333-266099

PROSPECTUS SUPPLEMENT NO. 13

(TO PROSPECTUS DATED JULY 18, 2022)

3,076,924 Units

consisting of

Common Shares or Pre-Funded Warrants to Purchase Common Shares and

Class A Warrants to Purchase Common Shares

(minimum offering amount)

12,307,692 Units

consisting of

Common Shares or Pre-Funded Warrants to Purchase Common Shares and

Class A Warrants to Purchase Common Shares

(maximum offering amount)

UNITED MARITIME CORPORATION

This is a supplement (“Prospectus Supplement”) to the prospectus, dated July 18, 2022 (“Prospectus”) of United Maritime Corporation (the “Company”), which forms a part of the Company’s Registration Statement on Form F-1 (Registration No. 333-266099), as further amended or supplemented from time to time.

On December 22, 2022, the Company furnished a Current Report on Form 6-K with the U.S. Securities and Exchange Commission as set forth below.

This Prospectus Supplement should be read in conjunction with, and delivered with, the Prospectus and is qualified by reference to the Prospectus except to the extent that the information in this Prospectus Supplement supersedes the information contained in the Prospectus.

This Prospectus Supplement is not complete without, and may not be delivered or utilized except in connection with, the Prospectus, including any amendments or supplements to it.

Investing in our securities involves a high degree of risk. See “Risk Factors” beginning on page 8 of the Prospectus for a discussion of information that should be considered in connection with an investment in our securities.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus supplement is December 22, 2022.

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, 2022

Commission File Number: 001-41413

UNITED MARITIME CORPORATION

(Translation of registrant’s name into English)

154 Vouliagmenis Avenue

166 74 Glyfada

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     ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):  _______

Note: Regulation S-T Rule 101(b)(1) only permits the submission in paper of a Form 6-K if submitted solely to provide an attached annual report to security holders.

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):  _______

Note: Regulation S-T Rule 101(b)(7) only permits the submission in paper of a Form 6-K if submitted to furnish a report or other document that the registrant foreign private issuer must furnish and make public under the laws of the jurisdiction in which the registrant is incorporated, domiciled or legally organized (the registrant's "home country"), or under the rules of the home country exchange on which the registrant's securities are traded, as long as the report or other document is not a press release, is not required to be and has not been distributed to the registrant's security holders, and, if discussing a material event, has already been the subject of a Form 6-K submission or other Commission filing on EDGAR.

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 United Maritime Corporation dated December 20, 2022, titled “United Maritime Announces Profitable Sale of an LR2 Tanker for $39 million.”

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.

	UNITED MARITIME CORPORATION
	(Registrant)
	By:	/s/ Stamatios Tsantanis
	Name:	Stamatios Tsantanis
	Title:	Chief Executive Officer
Date:  December 22, 2022

Exhibit 99.1

United Maritime Announces Profitable Sale of an LR2 Tanker for $39 million

December 20, 2022 – Glyfada, Greece – United Maritime Corporation (the “Company” or “United”) (NASDAQ: USEA), announced today that it has entered into a definitive agreement with an unaffiliated third party for the sale of one of its LR2 product tankers, the 2008-built MT Minoansea. The vessel is scheduled to be delivered to its new owner by the end of December 2022.

The vessel’s gross sale price is $39 million, and the transaction is subject to customary closing procedures.

Stamatis Tsantanis, the Company’s Chairman & Chief Executive Officer, stated:

“We are extremely pleased to announce another exceptionally profitable transaction for our shareholders, as the gross sale price of the Minoansea is at a premium of over 100% of the vessel’s acquisition price, while the return on equity is estimated at approximately 480%. The transaction follows the sale of the Company’s two Aframax vessels at a premium of approximately 50% over the vessels’ acquisition prices with a respective return on equity of approximately 240%.

Since United Maritime’s initial listing six months ago, we have generated a combined profit from the sale of the three tankers of approximately $38m, which represents 130% of the Company’s market capitalisation as of December 19, 2022, and we have declared a special dividend of $1 per share.

Following the sale of the vessels and the payment of the special dividend the cash equivalents of the Company are estimated in excess of $8.8 per share.

We remain consistent with our strategy to pursue well-timed investments in the shipping industry and to generate profits   in order to fund our growth and to further enhance our shareholders’ returns.”

About United Maritime Corporation

United Maritime Corporation is an international shipping company specializing in worldwide seaborne transportation services. Upon completion of the sale of the MT Minoansea, the Company's fleet will consist of one tanker vessel and one dry bulk vessel with an aggregate cargo carrying capacity of 280,961 dwt.

The Company is incorporated under the laws of the Republic of the Marshall Islands and has executive offices in Glyfada, Greece. The Company's common shares trade on the Nasdaq Capital Market under the symbol “USEA”.

Please visit the Company’s website at: www.unitedmaritime.gr

Forward-Looking Statements

This press release contains forward-looking statements (as defined in Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended) concerning future events. Words such as "may", "should", "expects", "intends", "plans", "believes", "anticipates", "hopes", "estimates" and variations of such words and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. These statements involve known and unknown risks and are based upon a number of assumptions and estimates, which are inherently subject to significant uncertainties and contingencies, many of which are beyond the control of the Company. Actual results may differ materially from those expressed or implied by such forward-looking statements. Factors that could cause actual results to differ materially include, but are not limited to, shipping industry trends, including charter rates, vessel values and factors affecting vessel supply and demand; the impact of changes in regulatory requirements or actions taken by regulatory authorities on the Company's operating or financial results; the Company's financial condition and liquidity, including its ability to service its indebtedness; competitive factors in the market in which the Company operates; increased operating costs associated with vessel aging; vessel damage; future, pending or recent acquisitions and dispositions, business strategy, areas of possible expansion or contraction, and expected capital spending or operating expenses; dependence on affiliates of the Company’s former parent and third-party managers to operate the Company’s business; availability of crew, number of off-hire days, classification survey requirements and insurance costs; changes in the Company’s relationships with contract counterparties; potential liability from future litigation and incidents involving the Company’s vessels; broader market impacts arising from war (or threatened war) or international hostilities, such as between Russia and Ukraine; risks associated with the length and severity of the ongoing novel coronavirus (COVID-19) outbreak, including its effects on demand for crude oil, petroleum products, dry bulk products, other types of products and the transportation thereof; and other factors listed from time to time in the Company's filings with the SEC, including its registration statement on Form 20-F. The Company's filings can be obtained free of charge on the SEC's website at www.sec.gov. Except to the extent required by law, the Company expressly disclaims any obligations or undertaking to release publicly any updates or revisions to any forward-looking statements contained herein to reflect any change in the Company's expectations with respect thereto or any change in events, conditions or circumstances on which any statement is based.

For further information please contact:

United Investor Relations

Tel: +30 213 0181 522

E-mail: ir@usea.gr

Capital Link, Inc.

Paul Lampoutis

230 Park Avenue Suite 1540

New York, NY 10169

Tel: (212) 661-7566

E-mail: usea@capitallink.com