Customers Bancorp, Inc.

This summary highlights certain information contained in this Proxy Statement. This summary does not contain all of the information you should consider. We encourage you to review all of the important information contained in this Proxy Statement carefully before voting. For purposes of this Proxy Statement, any references to the “Company,” “Customers,” “we,” “us,” or “our” refer to Customers Bancorp, Inc. For purposes of this Proxy Statement, any references to the “Board of Directors” or the “Board” refer to the Board of Directors of Customers Bancorp, Inc. For purposes of this Proxy Statement, any references to the “Bank” refer to Customers Bank.

HOW TO VOTE YOUR SHARES

You may vote if you were a shareholder as of the close of business on April 1, 2026 (the “Record Date” for the Annual Meeting). Each share of Voting Common Stock outstanding on the Record Date is entitled to one vote for each Director nominee and one vote for the other proposals to be voted on at our Annual Meeting.

Even if you plan to attend our Annual Meeting online through the live webcast, please cast your vote as soon as possible by voting:

Shareholders entitled to vote at the Annual Meeting and attending the Annual Meeting through the live webcast may also vote their shares during the meeting. Instructions on how to vote during the meeting are included at: www.meetnow.global/MK99JGA.

In addition, shareholders entitled to vote at the Annual Meeting who wish to change a previously submitted vote may do so by voting online during the meeting. If you experience any difficulties voting during the meeting, please call 1-888-724-2416.

NOTE THAT IF YOU HAVE PREVIOUSLY SUBMITTED A PROXY OR HAVE ALREADY VOTED ONLINE OR BY PHONE AND DO NOT WANT TO CHANGE YOUR VOTE, YOU DO NOT NEED TO VOTE ELECTRONICALLY DURING THE VIRTUAL ANNUAL MEETING.

ITEMS OF BUSINESS AND BOARD VOTING RECOMMENDATION

To review our 2026 Proxy Statement and Annual Report on Form 10-K for the fiscal year ended December 31, 2025, on line, go towww.envisionreports.com/CUBI. These documents are also available on the Company’s website atwww.customersbank.com/investor-relations, by selecting “SEC filings”or “Proxy statements”, as appropriate. Information on our website is not incorporated by reference into this Proxy Statement.