UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C.

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 October 2021

COMMISSION FILE NUMBER: 001-33373

CAPITAL PRODUCT PARTNERS L.P.

(Translation of registrant’s name into English)

3 Iassonos Street

Piraeus, 18537 Greece

(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):   ☐

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):   ☐

On October 20, 2021, Capital Product Partners L.P. issued a press release announcing that its wholly owned subsidiary, CPLP Shipping Holdings PLC, has successfully priced its previously announced offering of €150 million of unsecured bonds in Greece.

A copy of the press release is attached as Exhibit I hereto.

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 I

CAPITAL PRODUCT PARTNERS L.P. ANNOUNCES PRICING OF €150 MILLION UNSECURED BONDS

ATHENS, GREECE — (GLOBENEWSWIRE) – 10/20/21 — Capital Product Partners L.P. (the “Partnership,” “CPLP” or “we” / “us”) (NASDAQ: CPLP), an international owner of ocean-going vessels, today announced that its wholly owned subsidiary, CPLP Shipping Holdings PLC, has successfully priced its previously announced offering of €150 million of unsecured bonds (the “Bonds”) in Greece. The Bonds will be guaranteed by CPLP. The Bonds will mature in 2026 and will have a coupon of 2.65%, payable semi-annually. The offering is subject to customary closing conditions, and settlement is expected to occur on October 22, 2021. The trading of the Bonds on the Athens Exchange is expected to commence on October 25, 2021.

The net proceeds of the offering are intended to be used to partly finance the acquisition of three X-DF LNG sister vessels, which the Partnership has the option to acquire, granted in connection with the acquisition of another three X-DF LNG carriers, as announced on August 31, 2021 (the “Optional Vessels”). The Optional Vessels are expected to be acquired at an average price of $207.7 million per vessel with aggregate contracted revenues of approximately $429.0 million and an average aggregate daily rate of approximately $70,650 per day. The Optional Vessels are all built in 2021 and are chartered to BP Gas Marketing Limited (“BP”), Cheniere Marketing International LLP and Engie Energy Marketing Singapore Pte Ltd with a remaining charter duration of 6.3 years, which includes in the case of the BP time charter the first two optional periods.

Mr. Jerry Kalogiratos, Chief Executive Officer of our General Partner, commented:

“We are pleased to announce the closing of our first shipping bond on the Athens Exchange. The successful bond issue further diversifies our Company’s sources of financing and allows us to execute on our business plan with an attractive overall cost of capital. The bond was issued at the low end of the yield range based on exceptionally high demand.”

The Bonds have not been, and will not be, registered under the Securities Act of 1933, as amended (the “Securities Act”) or the securities laws of any U.S. state or other jurisdiction other than Greece and may not be offered or sold in the United States absent registration or an exemption from the registration requirements of the Securities Act and any other applicable securities laws. This press release does not constitute an offer to sell or the solicitation of an offer to buy the Bonds, nor shall it constitute an offer, solicitation or sale in any jurisdiction in which such offer, solicitation or sale would be unlawful. In addition, this announcement is not intended as and shall not constitute a public offer or advertisement of securities in Greece or an invitation to make offers to purchase any securities in any EEA Member State within the meaning of Art. 2(d) or 2(k) of the Prospectus Regulation, respectively.

About Capital Product Partners L.P.

Capital Product Partners L.P. (NASDAQ: CPLP), a Marshall Islands master limited partnership, is an international owner of ocean-going vessels. CPLP currently owns 18 vessels, including twelve Neo-Panamax container vessels, three Panamax container vessels, one Capesize bulk carrier and two LNG carriers and has agreed to acquire a third LNG carrier.

For more information about the Partnership, please visit: www.capitalpplp.com .

Forward-Looking Statements

The statements in this press release that are not historical facts, including among other things, the use of proceeds from the offering of the Bonds, are forward-looking statements (as such term is defined in Section 21E of the Securities Exchange Act of 1934, as amended). These forward-looking statements involve risks and uncertainties that could cause the stated or forecasted results to be materially different from those anticipated. For a discussion of factors that could materially affect the outcome of forward-looking statements and other risks and uncertainties, see “Risk factors” in CPLP’s annual report filed with the SEC on Form 20-F as supplemented and updated by CPLP’s Form 6-K dated October 12, 2021. Unless required by law, CPLP expressly disclaims any

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obligation to update or revise any of these forward-looking statements, whether because of future events, new information, a change in its views or expectations, to conform them to actual results or otherwise. CPLP assumes no responsibility for the accuracy and completeness of the forward-looking statements. You are cautioned not to place undue reliance on forward-looking statements.

CPLP-F

Contact Details:

Capital GP L.L.C.

Jerry Kalogiratos

CEO

Tel. +30 (210) 4584 950

E-mail: j.kalogiratos@capitalpplp.com

Capital GP L.L.C.

Nikos Kalapotharakos

CFO

Tel. +30 (210) 4584 950

E-mail: n.kalapotharakos@capitalmaritime.com

Investor Relations / Media

Nicolas Bornozis

Capital Link, Inc. (New York)

Tel. +1-212-661-7566

E-mail: cplp@capitallink.com

Source: Capital Product Partners L.P.

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