PRELIMINARY - SUBJECT TO COMPLETION
Signature [PLEASE SIGN WITHIN BOX] Date Signature (Joint Owners) Date TO
VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS: KEEP THIS PORTION FOR YOUR RECORDS DETACH AND RETURN THIS PORTION ONLY THIS PROXY CARD IS VALID ONLY WHEN SIGNED. V79577-TBD 2. Proposal to approve, on a non-binding, advisory
basis, the compensation that may be paid or become payable to Steelcase’s named executive officers that is based on or otherwise relates to the mergers contemplated by the Merger Agreement (the “Steelcase compensation proposal”). NOTE: In
their discretion, the proxies are authorized to vote upon such other business as may properly come before the Steelcase special meeting or any adjournment or postponement thereof. Please sign exactly as your name(s) appear(s) hereon. When
signing as attorney, executor, administrator, or other fiduciary, please give full title as such. Joint owners should each sign personally. All holders must sign. If a corporation or partnership, please sign in full corporate or partnership
name by authorized officer. For Against Abstain ! ! ! STEELCASE INC. The Board of Directors recommends a vote FOR Proposals 1 and 2: 1. Proposal to adopt the Agreement and Plan of Merger, dated as of August 3, 2025 (as amended from time
to time, the “Merger Agreement”), by and among HNI Corporation, Steelcase Inc. (“Steelcase”), Geranium Merger Sub I, Inc. (“Merger Sub Inc.”) and Geranium Merger Sub II, LLC, and approve the merger of Merger Sub Inc. with and into Steelcase
pursuant to the Merger Agreement (the “Steelcase merger proposal”). STEELCASE INC. 901 44TH STREET SE GRAND RAPIDS, MI 49508 ! ! ! VOTE BY INTERNET Before The Meeting - Go to www.proxyvote.com or scan the QR Barcode above Use the
Internet to transmit your voting instructions up until 11:59 p.m. Eastern Time on [ ], 2025. Have your proxy card in hand when you access the web site and follow the instructions to obtain your records and to create an electronic voting
instruction form. During The Meeting - Go to www.virtualshareholdermeeting.com/SCS2025SM You may attend the meeting via the Internet and vote during the meeting. Have the information that is printed in the box marked by the arrow available
and follow the instructions. VOTE BY PHONE - 1-800-690-6903 Use any touch-tone telephone to transmit your voting instructions up until 11:59 p.m. Eastern Time on [ ], 2025. Have your proxy card in hand when you call and then follow the
instructions. VOTE BY MAIL Mark, sign and date your proxy card and return it in the postage-paid envelope we have provided or return it to Vote Processing, c/o Broadridge, 51 Mercedes Way, Edgewood, NY 11717. SCAN TO VIEW MATERIALS &
VOTE
V79578-TBD Steelcase Inc. Special Meeting of Shareholders [ ], 2025, at [ ]
Eastern Time THIS PROXY IS SOLICITED BY THE BOARD OF DIRECTORS OF STEELCASE INC. Each signatory on the reverse side hereby appoints [ ] and [ ], and each of them, with the power of substitution, as proxies for the undersigned and authorizes
them to represent and vote all of the shares of class A common stock of Steelcase Inc. that the undersigned may be entitled to vote at the Special Meeting of Shareholders to be held on [ ], 2025, at [ ] Eastern Time (the "Steelcase special
meeting"), via live audio webcast at www.virtualshareholdermeeting.com/SCS2025SM, and at any adjournment or postponement thereof. This proxy, when properly executed, will be voted in the manner directed herein or, if no such direction is
given, will be voted FOR each of Proposal 1 (the Steelcase merger proposal) and Proposal 2 (the Steelcase compensation proposal). In their discretion, the proxies named herein are authorized to vote in accordance with their judgment upon such
other business as may properly come before the Steelcase special meeting or any adjournment or postponement thereof. IMPORTANT: PLEASE MARK, SIGN, AND DATE THIS PROXY ON THE REVERSE SIDE.