UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 13D/A

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO § 240.13D-1(A) AND AMENDMENTS THERETO FILED

PURSUANT TO § 240.13D-2(A)

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 21)

Capital Product Partners L.P.

(Name of Issuer)

Common units, representing limited partner interests

(Title of Class of Securities)

Y11082206

(CUSIP Number)

Gerasimos (Jerry) Kalogiratos

Capital Maritime & Trading Corp.

3 Iassonos Street

Piraeus, 18537, Greece

Tel: +30 210 458-4950

with a copy to:

Richard A. Pollack

Sullivan & Cromwell LLP

1 New Fetter Lane

London, EC4A 1AN

Tel: +44-20-7959-8900

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

October 12, 2022

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.  ☐

This Amendment No. 21 amends and supplements the disclosures in Items 2 through 5 of the Schedule 13D (the “Schedule 13D”) filed with the Securities and Exchange Commission (the “SEC”) on April 4, 2008, as amended by amendments thereto filed on August 8,2022, April 4, 2022, December 21, 2021, December 7, 2021, October 18, 2021, September 22, 2020, September 10, 2020, May 1, 2019, December 14, 2018, December 3, 2018, April 23, 2015, September 29, 2014, March 29, 2013, June 13, 2012, May 31, 2012, October 26, 2011, October 5, 2011, May 9, 2011, February 26, 2009, and April 30, 2008, relating to the common units representing limited partner interests (the “Common Units”) of Capital Product Partners L.P., a limited partnership organized under the laws of the Republic of the Marshall Islands (the “Issuer”). Unless specifically amended hereby, the disclosures set forth in the Schedule 13D remain unchanged.

Item 2. Identity and Background.

This Schedule 13D is jointly filed by Capital Maritime & Trading Corp. (“Capital Maritime”), Evangelos M. Marinakis and Miltiadis E. Marinakis (collectively, the “Reporting Persons”).

The principal business office and address of each Reporting Person is c/o Capital Maritime, 3 Iassonos Street Piraeus, 18537, Greece.

Mr. Evangelos M. Marinakis is the chairman and a director of Capital Maritime.

Mr. Miltiadis E. Marinakis is the son of Mr. Evangelos M. Marinakis. Although not engaged in day-to-day management, Mr. Miltiadis E. Marinakis holds and oversees certain shipping interests on behalf of the Marinakis family.

The principal business of Capital Maritime consists of shipping and transportation services.

The name, position, address and citizenship of the directors and executive officers of Capital Maritime are set forth on Schedule A attached hereto, and are incorporated herein by reference.

During the past five years, none of the Reporting Persons, and to the best of their knowledge, none of the Reporting Persons’ directors or executive officers (as applicable) (1) has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or (2) has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

Item 3. Source and Amount of Funds or Other Consideration.

Item 3 is hereby amended and supplemented by adding the following:

On October 12, 2022, 505,204 Common Units out of the Issuer’s Treasury Stock were transferred to Capital Maritime, as further described in Item 4 below.

On September 14, 2022 Capital Maritime acquired 40,000 Common Units, in open market transactions, for an average price of $15.80 per Common Unit.

On September 2, 2022 Capital Maritime acquired 30,000 Common Units, in open market transactions, for an average price of $15.08 per Common Unit.

On September 1, 2022 Capital Maritime acquired 30,000 Common Units, in open market transactions, for an average price of $15.39 per Common Unit.

The source of funds used for these transactions was working capital of Capital Maritime. The information set forth in Item 4 of this Schedule 13D is hereby incorporated herein by reference

Item 4. Purpose of Transaction.

Item 4 is hereby amended and supplemented by adding the following:

On June 6, 2022, the Issuer agreed to acquire one 174,000 cubic meter latest generation X-DF LNG carrier and three 13,278 TEU hybrid scrubber-fitted, latest generation eco container vessels from Capital Maritime for total consideration of $597.5 million. $7.5 million of the total consideration was paid in the form of 505,204 Common Units out of Issuer’s Treasury Stock, which were transferred to Capital Maritime on October 12, 2022 (i.e., at a price of $14.8455 per Common Unit).

Item 4 is hereby further amended and supplemented by deleting the text “As of August 8, 2022, the Reporting Persons may be deemed to beneficially own in aggregate 26.2% of the Common Units issued and outstanding.” and adding the following:

As of October 17, 2022, the Reporting Persons may be deemed to beneficially own in aggregate 28.7% of the Common Units issued and outstanding.

Item 5. Interest in Securities of the Issuer.

Item 5 is hereby deleted and replaced in its entirety by the following:

The Marinakis family, including Mr. Miltiadis E. Marinakis, may be deemed to beneficially own, in aggregate, 1,153,846 Common Units, representing 5.7% of the outstanding Common Units, through Mr. Miltiadis E. Marinakis’ beneficial ownership of 100% of Capital Gas.

Furthermore, the General Partner owns 348,570 general partner units, representing a 1.7% partnership interest in the Issuer (calculated based on an aggregate of 20,691,306 units of the Issuer). Disclosure contained in Item 4 is incorporated herein by reference.

(b)

Neither the filing of the Schedule 13D nor any of its contents shall be deemed to constitute an admission that any of the Reporting Persons (other than Capital Maritime) or the persons set forth on Schedule A is the beneficial owner of the Common Units referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed.

(d) Except as described in Item 6 of the Schedule 13D, no other person is known by any Reporting Person to have the right to receive or the power to direct the receipt of distributions from, or the proceeds from the sale of, Common Units beneficially owned by such Reporting Person.

SIGNATURES

After reasonable inquiry and to the best of each of the undersigned’s knowledge and belief, each of the undersigned certify that the information set forth in this statement is true, complete and correct.

Dated: October 17, 2022

SCHEDULE A