UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

Bruker Corporation

(Name of Registrant as Specified in its Charter)

Not applicable.

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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Your Vote Counts! BRUKER CORPORATION 2022 Annual Meeting Vote by May 31 I 2022 11:59 PM ET BRUKER CORPORATION C/O AMERICAN STOCK TRANSFER 6201 FIFTEENTH AVENUE BROOKLYN, NY 11219 You invested in BRUKER CORPORATION and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on June 01, 2022. Get informed before you vote View the Annual Report, Notice & Proxy Statement online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 18, 2022. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Point your camera here and vote without entering a control number Vote Virtually at the Meeting* June 01 I 2022 10:00 AM EDT Virtually at: www.virtualshareholdermeeting .com/BRKR2022 * Please check the meeting materials for any special requirements for meeting attendance.

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items Board Recommends 1. Election of three directors to serve for a three-year term expiring in 2025. Nominees: 01) Bonnie H. Anderson 03) John Ornell 02) Frank H. Laukien, Ph.D. 04) Richard A. Packer For 2. Approval on an advisory basis of the 2021 compensation of our named executive officers, as discussed in the Proxy Statement. For 3. Ratification of the appointment of PricewaterhouseCoopers LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2022. For 4. Approval of the Bruker Corporation Employee Stock Purchase Plan. For NOTE: In their discretion, the proxies are authorized to vote on such other business as may properly come before the meeting or any adjournment or postponement thereof. Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”.