Additional Proxy Soliciting Materials - Form DEFA14A

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A

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WestRock Company

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The following is an announcement made by Tony Smurfit, Group Chief Executive Officer of Smurfit Kappa Group plc ("Smurfit Kappa"), to employees of Smurfit Kappa. The announcement was made available to the employees of WestRock Company ("WestRock") by WestRock on May 17, 2024.

Announcement

Smurfit WestRock - Organisation and Leadership Team Update

17 May 2024

Following the 12 September 2023 announcement of the signing of a definitive transaction agreement to create Smurfit WestRock (the 'Combination'), the integration planning process commenced for the new combined organisational design; the operational business model; and the operations leadership team.

I am pleased to share that we are making progress with our integration planning. In my last communications on 13 March 2024, I indicated that I would have a further update regarding the future leadership teams of Smurfit WestRock. All of the appointments and structures in this announcement will only be applicable upon the completion ('Completion') of the proposed combination between Smurfit Kappa and WestRock, which is still subject to the satisfaction of the required closing conditions, including shareholder and regulatory approvals.

Further decisions will be made post-closing, and I will update on any outstanding roles at the appropriate time. Additionally, where required, we have commenced a number of internal recruitment processes and will continue to do so in the coming weeks/months to ensure a fair selection process for talent. This is an iterative process, and the remainder of the organisation structures will evolve between now and into early next year.

CEO Office*:

In my communication in March, I communicated the proposed CEO office and structure which will be as follows. *(Following completion, the Group General Counsel and legal function will also report to the CEO office)

At a Regional level:

As the integration process continues, plans are now in place for the following regional senior leadership teams for day 1.

1 - North America (including Mexico): This region will encompass the United States, Mexico and Canada and will be led by Laurent Sellier. The new senior leadership team for the region is as follows:

2 - Europe, MEA & APAC: This region will encompass operations in Europe and Africa, as well as Asia Pacific and India, and will be led by Saverio Mayer. The existing Country CEO and functional leadership structures in Smurfit Kappa Europe does not change. Mark Shaw and his team, will continue in their roles to lead on the region's consumer packaging business, reporting directly to Edwin Goffard. See regional leadership team:

3 - LATAM: This region will encompass Central America and the Caribbean, Argentina, Brazil, Chile, Colombia, Ecuador, and Peru. It will be led by Jairo Lorenzatto. The new senior leadership team for the region is as follows:

Finance & Corporate Functions Update*:

The additional corporate functions under the EVP and Group CFO, Ken Bowles is as follows:

* The Group SVP Finance & Company Secretary will have dual reporting. Additionally, given the highly complex area of IT, we will also operate a co-existence model until we are ready to fully integrate the technology footprint.

Group Human Resources Update:

Human Resources will continue to support the business and our employees with integration efforts and change management. The integration planning for the HR functions between Smurfit Kappa and WestRock is underway. Upon completion the following Group HR team will be in place, and over the next 12 months, integration plans will be led out across the key COE's (Centres of Expertise):

Please join with me in wishing all of the above leaders' great success in the years ahead. I remain incredibly excited about the future of Smurfit WestRock and what the combination of these two great organisations will bring. I am confident that this leadership team will lead us into a smooth transition period and ultimately lead to positive outcomes for all, creating opportunities for growth, enhancing customer service and efficiency into the future.

I also understand that change can sometimes be challenging, our commitment is to continue to support you with open communications and the necessary resources needed during this transition to ensure a smooth period for employees.

I appreciate your continued dedication and hard work as we embark on this exciting journey.

Tony Smurfit

Group Chief Executive Officer

Smurfit Kappa Group plc

Additional Note: All appointments are being made as a result of leadership requirements relating to the proposed Combination of Smurfit Kappa and WestRock. These appointments are effective only upon the Completion date, and any role changes would become permanent only upon the successful Completion of the proposed Smurfit WestRock Combination.

PRIVATE & CONFIDENTIAL NewCo Org Charts Leadership Teams 16 May 2024

Group CEO & President Office Smurfit WestRock Group CEO & President Tony Smurfit President & CEO N.America (Inc Mexico) Laurent Sellier President & CEO Europe, MEA & APAC Saverio Mayer President & CEO LATAM Jairo Lorenzatto Executive Vice President & Group CFO Ken Bowles Chief Human Resources Officer Sharon Whitehead Group Corporate Planner Ray Murphy SVP Integration John Stakel Alvaro Henao Regional Business Leadership Group Functions - Leadership Group SVP Finance & Company Secretary Gillian Carson - Callan SVP Integration

Smurfit WestRock North America (Including Mexico) Leadership President & CEO North America (Inc Mexico) Laurent Sellier Business/Country Leadership Regional Functions - Leadership President USA & Canada Corrugated & Victory Packaging Patrick Kivits President USA & Canada Paper/Mills Tom Stigers President USA & Canada Consumer Packaging Sam Shoemaker President Smurfit WestRock Mexico Jorge Angel President Global Paper John O'Neal Regional CFO Juan Pablo Perez Regional VP Human Resources Stacy Litchfield Regional VP Communications Internal/External Tammy Pollock Chief Innovation & Science Officer Ben Patel Chief Supply Chain Officer Peter Anderson Regional VP & Senior Counsel Environmental, Health & Safety Nina Butler

Smurfit WestRock Europe, MEA & APAC Leadership President & CEO Europe, MEA, & APAC Saverio Mayer Business Leadership Regional Functions - Leadership President Corrugated & Consumer Packaging Edwin Goffard President Paper/Mills Javier Rivas Regional CFO Pat McNeill Regional VP Human Resources Lieke Koelewijn Regional VP Communications (Internal/External) Emer Cobbe Chief Innovation Officer Arco Berkenbosch Regional Director Health & Safety John Nicholls Regional VP Procurement To be appointed

Smurfit WestRock LatAm Leadership President & CEO LATAM Jairo Lorenzatto Business/Country Leadership Regional Functions - Leadership CEO Brazil Manuel Alcala CEO Colombia & Central Cluster German Gambini CEO Argentina & Chile Rodrigo Longarte Regional CFO Luis Mercader Regional VP Human Resources Troy Vague Regional VP Communications Internal/External Carlina Toledo Regional VP Procurement Dan Bergdahl VP Technical & Operational Excellence Jose Luis Rivera VP Mills John Jairo Amaya PMO Director Decio Meira Junior Beverage Consumer Packaging German Gravenhorst VP Pan American Sales Marcela Liscano

Office of EVP & CFO Finance & Corporate Functions Smurfit WestRock Executive Vice President & CFO Ken Bowles Finance Leadership Corporate Functions - Leadership Group SVP Finance & Company Secretary Gillian Carson - Callan Group SVP Treasury Emer Murnane Group VP Tax Ken Byrne Group VP Internal Audit Heli Mooney Chief Accounting Officer Irene Page Group VP of Risk & Insurance Steve Paris GLOBAL INFORMATION SYSTEMS* SUSTAINABILITY INVESTOR RELATIONS/REPUTATION / EXTERNAL COMMS Chief Information Officer Legacy SKG GIS Richard Schouten Chief Information & Digital Officer Legacy WRK GIS Amir Kazmi *Co - Leadership during year 1 for Integration Planning Group Chief Sustainability Officer Garrett Quinn Group VP Investor Relations Ciaran Potts Creative Services Leader Kelly Fowler Group VP Corporate Comms Gloria Potchiko Regional CFO North America Juan Pablo Perez Regional CFO Europe, MEA & APAC Pat McNeill Regional CFO LATAM Luis Mercader Business CFO's - Dotted line reporting to EVP & CFO

Smurfit WestRock Group Human Resources Leadership Chief Human Resources Officer Sharon Whitehead Rewards - Legacy SK Business Tom Gallagher Global Rewards* Rewards - Legacy WRK Business Kathy Mullins HRIS/Ops Legacy WRK Business Kevin Shigley HRIS & HR Operations* HRIS/Ops Legacy SKG Business Catherine Paul HR Legacy SKG & HR Integration Deirdre Cregan Talent & Diversity HR Legacy WRK & HR Integration Stephanie White SWK Group HR Integration Director Róisín Foley Integration Regional Vice President HR America Stacy Litchfield Business HR (dotted line reporting to Group CHRO ) SWK Employee Experience & Internal Comms Sue Lamon - Diver Int. Comms Regional Vice President HR LatAm Troy Vague HR Rewards/HRIS/Talent Co - Leadership during Year 1 for HR Integration Planning *Vicki Lostetter CHRO WestRock leading key Rewards & HRIS Integration Projects until Dec 31, 2024 Regional Vice President HR Europe MEA & APAC Lieke Koelewijn

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