WRKCo POSASRAutomatic shelf registration (post-effective amendment)

As filed with the Securities and Exchange Commission on July 18, 2024

Registration Statement No. 333-262524

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

POST-EFFECTIVE AMENDMENT NO. 1 TO

FORM S-3 REGISTRATION STATEMENT NO. 333-262524

UNDER THE SECURITIES ACT OF 1933

WestRock Company*

(Exact Name of Registrant as Specified in Its Charter)

1000 Abernathy Road

Atlanta, Georgia 30328

(770) 448-2193

(Address, Including Zip Code, and Telephone Number, Including Area Code, of Registrant’s Principal Executive Offices)

WRKCo Inc.

(Exact Name of Registrant as Specified in Its Charter)

c/o WestRock Company

1000 Abernathy Road

Atlanta, Georgia 30328

(770) 448-2193

(Address, Including Zip Code, and Telephone Number, Including Area Code, of Registrant’s Principal Executive Offices)

(See Table of Additional Registrant Guarantors for information regarding additional Registrants)

Ken Bowles

WestRock Company

1000 Abernathy Road

Atlanta, GA 30328

(770) 448-2193

(Name, address and telephone number, including area code, of agent for service)

Copies to:

Victor Goldfeld

Wachtell, Lipton, Rosen & Katz

51 West 52nd Street

New York, New York 10019

(212) 403-1000

Approximate date of commencement of proposed sale to the public: Not applicable.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ¨

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ¨

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. x

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

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 7(a)(2)(B) of the Securities Act. ¨

TABLE OF ADDITIONAL REGISTRANT GUARANTORS(1)(2)

DEREGISTRATION OF UNSOLD SECURITIES

WestRock, WRKCo Inc., a Delaware corporation, WestRock MWV, LLC, a Delaware limited liability company, and WestRock RKT, LLC, a Georgia limited liability company (collectively, the “Registrants”), are filing with the Securities and Exchange Commission (the “SEC”) this post-effective amendment (this “Post-Effective Amendment”) to the Registration Statement on Form S-3 (File No. 333-262524), filed with the SEC on February 4, 2022 (the “Registration Statement”), to deregister any and all securities registered but unsold or otherwise unissued as of the date hereof under the Registration Statement.

This Post-Effective Amendment is being filed as a result of the Merger. The Registrants, by filing this Post-Effective Amendment, hereby terminate the effectiveness of the Registration Statement and remove from registration any and all securities registered but unsold or otherwise unissued under the Registration Statement as of the date hereof. This filing is made in accordance with an undertaking made by the Registrants in Part II of the Registration Statement to remove from registration by means of a post-effective amendment any securities that had been registered for issuance but remain unsold at the termination of the offering.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Post-Effective Amendment to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Dublin, in the Country of Ireland, on July 18, 2024. No other person is required to sign this Post-Effective Amendment to the Registration Statement in reliance on Rule 478 of the Securities Act of 1933, as amended.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Post-Effective Amendment to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Dublin, in the Country of Ireland, on July 18, 2024. No other person is required to sign this Post-Effective Amendment to the Registration Statement in reliance on Rule 478 of the Securities Act of 1933, as amended.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Post-Effective Amendment to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Dublin, in the Country of Ireland, on July 18, 2024. No other person is required to sign this Post-Effective Amendment to the Registration Statement in reliance on Rule 478 of the Securities Act of 1933, as amended.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Post-Effective Amendment to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Dublin, in the Country of Ireland, on July 18, 2024. No other person is required to sign this Post-Effective Amendment to the Registration Statement in reliance on Rule 478 of the Securities Act of 1933, as amended.