UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 OR 15(d)

of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): February 11, 2026

Smurfit Westrock plc 

(Exact name of registrant as specified in its charter)

Beech Hill, Clonskeagh

Dublin 4, D04 N2R2

Ireland

(Address of principal executive offices, including Zip Code)

+353 1 202 7000

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, 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. ¨

On February 11, 2026, Smurfit Westrock plc (the “Company”) issued a press release announcing the financial results for the fourth quarter and full year ended December 31, 2025. The earnings press release is furnished as Exhibit 99.1 and is incorporated into this Item 2.02 by reference.

The information provided pursuant to this Item 2.02, including Exhibit 99.1, is being “furnished” and shall not be deemed “filed” hereunder for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, except as shall be expressly set forth by specific reference in any such filings.

In addition, on February 11, 2026, the Company issued a press release announcing 2030 financial targets and capital allocation priorities in connection with its medium-term plan (the “Medium-Term Plan”). The Medium-Term Plan-related press release is furnished as Exhibit 99.2 and is incorporated into this Item 7.01 by reference.

On February 11, 2026, the Company will host a conference call during which it will discuss the Company’s financial results for the fourth quarter and full year ended December 31, 2025, together with an update for investors on its Medium-Term Plan. The presentations to be used in connection with the earnings and Medium-Term Plan conference call are attached hereto as Exhibits 99.3 and 99.4.

The information provided pursuant to this Item 7.01, including Exhibits 99.2, 99.3 and 99.4, is being “furnished” and shall not be deemed “filed” hereunder for purposes of Section 18 of the Exchange Act or incorporated by reference in any filing under the Securities Act or the Exchange Act, except as shall be expressly set forth by specific reference in any such filings.

Forward Looking Statements

This Current Report on Form 8-K includes certain “forward-looking statements” (including 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) regarding, among other things, our Medium-Term Plan and any other statements regarding the Company's future expectations, beliefs, plans, objectives, results of operations, financial condition and cash flows, or future events, outlook or performance. Statements that are not historical facts, including statements about the beliefs and expectations of the management of the Company, are forward-looking statements. Words such as “may”, “will”, “could”, “should”, “would”, “anticipate”, “intend”, “estimate”, “project”, “plan”, “believe”, “expect”, “target”, “prospects”, “potential”, “commit”, “forecasts”, “aims”, “considered”, “likely” and variations of these words and similar future or conditional expressions are intended to identify forward-looking statements but are not the exclusive means of identifying such statements. While the Company believes these expectations, assumptions, estimates and projections are reasonable, such forward-looking statements are only predictions and involve known and unknown risks and uncertainties, many of which are beyond the control of the Company. By their nature, forward-looking statements involve risk and uncertainty because they relate to events and depend upon future circumstances that may or may not occur. Actual results may differ materially from the current expectations of the Company depending upon a number of factors affecting its business, including, but not limited to, our ability to deliver on our Medium-Term Plan and the risk factors discussed in the Company’s filings with the Securities and Exchange Commission, including the Company’s most recent Annual Report on Form 10-K. Neither the Company nor any of its associates or directors, officers or advisers provides any representation, assurance or guarantee that the occurrence of the events expressed or implied in any such forward-looking statements will actually occur. You are cautioned not to place undue reliance on these forward-looking statements. Other than in accordance with its legal or regulatory obligations (including under the UK Listing Rules, the Disclosure Guidance and Transparency Rules, the UK Market Abuse Regulation and other applicable regulations), the Company is under no obligation, and the Company expressly disclaims any intention or obligation, to update or revise publicly any forward-looking statements, whether as a result of new information, future events or otherwise.

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 hereunto duly authorized.

Date: February 11, 2026