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

OF THE SECURITIES EXCHANGE ACT OF 1934

DATED: October 15, 2021

Commission File No. 001-33811

NAVIOS MARITIME PARTNERS L.P.

7 Avenue de Grande Bretagne, Office 11B2

Monte Carlo, MC 98000 Monaco

(Address of Principal Executive Offices)

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):    Yes  ☐    No  ☒

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):    Yes  ☐    No  ☒

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.    Yes  ☐    No  ☒

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): N/A

On October 15, 2021, Navios Maritime Partners L.P. (“NMM”) completed the merger contemplated by the previously announced Agreement and Plan of Merger (the “Merger Agreement”), dated as of August 25, 2021, by and among NMM, its direct wholly-owned subsidiary Navios Acquisition Merger Sub. Inc. (“Merger Sub”) and Navios Maritime Acquisition Corporation (“NNA”). Pursuant to the Merger Agreement, Merger Sub merged with and into NNA, with NNA continuing as the surviving corporation. As a result of the Merger, NNA became a wholly-owned subsidiary of NMM.

Pursuant to the terms of the Merger Agreement, each outstanding common share of NNA that was held by a shareholder other than (i) shares held by NMM, NNA and their respective subsidiaries and (ii) shares that were subject to vesting or other forfeiture conditions (the “NNA Merger Shares”) was converted into the right to receive 0.1275 of a common unit of NMM. As a result of the Merger, approximately 3.4 million common units of NMM were issued to former holders of NNA Merger Shares.

The issuance of NMM common units in connection with the Merger was registered under the Securities Act of 1933, as amended, pursuant to NMM’s Registration Statement on Form F-4, which was filed with the U.S. Securities and Exchange Commission (the “SEC”) on September 14, 2021, as amended (the “F-4”). The F-4 was declared effective on September 23, 2021. The proxy statement/prospectus included with the F-4 contains additional information about the Merger.

On October 15, 2021, NMM issued a press release announcing the completion of the Merger. A copy of the press release is attached as Exhibit 99.1 to this report and is incorporated herein by reference.

The information contained in this report, except the second paragraph of Exhibit 99.1, which contains a quote by the Chairman and Chief Executive Officer of NMM, is hereby incorporated by reference into NMM’s Registration Statement on Form F-3, File No. 333-237934.

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.

EXHIBIT INDEX

Exhibit 99.1

Navios Maritime Partners L.P.

Secures Unitholder Approval and Completes Acquisition

of

Navios Maritime Acquisition Corporation

MONACO, October 15, 2021 — Navios Maritime Partners L.P. (“Navios Partners”) (NYSE: NMM), an international owner and operator of dry cargo and tanker vessels, announced that it completed the acquisition of Navios Maritime Acquisition Corporation (“Navios Acquisition”) (NYSE: NNA).

Angeliki Frangou, Chairwoman and Chief Executive Officer, stated, “We are pleased with this transformative transaction through which we created the largest U.S. publicly-listed shipping company with 15 vessel types diversified across three segments, servicing more than 10 end markets. About one-third of our fleet will be in each of the dry bulk, containership and tanker segment. We believe that this combination should result in a stronger, more resilient entity, mitigating sector specific cyclicality, and enabling us to capitalize on opportunities throughout the industry and provide even returns to our stakeholders across cycles.”

Merger Transaction Highlights

In the merger, each outstanding common share of Navios Acquisition (other than shares held by Navios Partners) was exchanged for 0.1275 of a common unit of Navios Partners, with Navios Partners issuing a total of approximately 3.4 million common units to the Navios Acquisition shareholders in the transaction. As a result of the merger, Navios Acquisition’s common shares were no longer listed for trading on NYSE.

Benefits of Combination

The Transaction:

Advisors

Latham & Watkins LLP acted as legal advisor and Pareto Securities AS acted as financial advisor to the Special Committee of Navios Acquisition. Thompson Hine LLP acted as legal advisor to Navios Acquisition. Fried, Frank, Harris, Shriver & Jacobson LLP acted as legal advisor and Jefferies LLC and S. Goldman Advisors LLC acted as financial advisors to Navios Partners.

About Navios Maritime Partners L.P.

Navios Maritime Partners L.P. (NYSE: NMM) is an international owner and operator of dry cargo and tanker vessels. For more information, please visit the Company’s website: www.navios-mlp.com.

Forward-Looking Statements

This communication contains forward-looking statements relating to the transaction involving Navios Partners and Navios Acquisition, including statements as to the effects of the transaction and statements relating to Navios Partners’ future success. Statements in this communication that are not statements of historical fact are considered forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, which are usually identified by the use of words such as “anticipates,” “believes,” “continues,” “could,” “estimates,” “expects,” “intends,” “may,” “plans,” “potential,” “predicts,” “projects,” “seeks,” “should,” “will,” and variations of such words or similar expressions. These forward-looking statements are neither forecasts, promises nor guarantees, and are based on the current beliefs of management of Navios Partners and Navios Acquisition as well as assumptions made by and information currently available to Navios Partners and Navios Acquisition. Such statements reflect the current views of Navios Partners and Navios Acquisition with respect to future events and are subject to known and unknown risks, including business, economic and competitive risks, uncertainties, contingencies and assumptions about Navios Partners and Navios Acquisition, including, without limitation, (i) potential adverse effects or changes to relationships with customers or other parties resulting from the completion of the proposed transaction, (ii) possible disruptions from the transaction that could harm Navios Partners and Navios Acquisition respective businesses, including current plans and operations, (iii) unexpected costs, charges or expenses resulting from the proposed transaction, (iv) uncertainty of the expected financial performance of the combined company following completion of the proposed transaction, including the possibility that the expected cost savings and other benefits

expected from the proposed transaction will not be realized or will not be realized within the expected time period, and (v) the unknown future impact of the COVID-19 pandemic on Navios Partners and Navios Acquisition’s operations or operating expenses. More details about these and other risks that may impact Navios Partners and Navios Acquisition respective businesses are described under the heading “Risk Factors” in the reports Navios Partners and Navios Acquisition file with or furnish to the SEC, including their respective Annual Reports on Form 20-F and Reports on Form 6-K, which are available on the SEC’s website at www.sec.gov. Navios Partners cautions you not to place undue reliance on any forward-looking statements, which speak only as of the date hereof. Navios Partners does not undertake any duty to update any forward-looking statement or other information in this communication, except to the extent required by law. Navios Partners makes no prediction or statement about the performance of its common units.

Contacts

Navios Maritime Partners L.P.

+1 (212) 906 8645

Investors@navios-mlp.com

Nicolas Bornozis

Capital Link, Inc.

+1 (212) 661 7566

naviospartners@capitallink.com