Exhibit 99.1

C/O BROADRIDGE CORPORATE ISSUER SOLUTIONS, INC.

P.O.  BOX 1342
BRENTWOOD, NY 11717

Date
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Name1
Name2
Name3
Name4
Address1
Address2
Address3
Address4
City, State ZIP
Country

Dear Stockholder:

Thank you for your continued support of Brookline Bancorp, Inc. (the “Company”). I am pleased to announce that we have appointed Broadridge Corporate Issuer Solutions, Inc. (“Broadridge”) as the Company’s Transfer Agent and Registrar. Broadridge will manage all stock registry requests for stockholders, including change of address, certificate replacement and transfer of shares. The change to Broadridge from American Stock Transfer & Trust Company, our former Transfer Agent and Registrar, became effective on June 9, 2017.

Please visit Broadridge Shareholder Services via the web at www.shareholder.broadridge.com/BRKL. There you will find important updates, a knowledge center and access to the shareholder portal. The portal allows you to view your holdings, manage your preferences and take action on your investments. You will need the following new account number.

Your New Account Number Is:

To use the shareholder portal, please follow the steps below:

** If your shares are registered as a trustee, custodianship, corporate account, IRA/retirement or non-US citizen, an additional pin number will be required. Follow the on-screen instructions in order to have a letter mailed to you containing your pin number and further instructions.

New Contact Information:

Go Green – Sign up for E-Delivery and manage electronic delivery preferences for future important Brookline Bancorp, Inc. correspondence.

Sincerely,

Michael W. McCurdy
Corporate Secretary