ISBC 2017 Form 10-K & 2018 Proxy Statement

101 JFK Parkway Short Hills, New Jersey 07078 April 12, 2018 Dear Fellow Stockholder: You are cordially invited to attend the 2018 Annual Meeting of Stockholders of Investors Bancorp, Inc., which will be held at The Grand Summit Hotel, 570 Springfield Avenue, Summit, New Jersey 07901, on May 22, 2018, at 9:00 a.m., local time. The business to be conducted at the Annual Meeting consists of the election of three directors, an advisory (non-binding) vote to approve the compensation paid to our Named Executive Officers and the ratification of the appointment of KPMG LLP as our independent registered public accounting firm for the year ending December 31, 2018. Your Board of Directors has determined that an affirmative vote on each of these matters is in the best interests of Investors Bancorp, Inc. and its stockholders and unanimously recommends a vote “FOR” the election of each of the nominees for director, “FOR” approval on an advisory basis of executive compensation and “FOR” ratification of the appointment of KPMG LLP as our independent registered public accounting firm for the year ending December 31, 2018. Your vote is very important. Whether or not you plan to attend the Annual Meeting, please promptly submit your vote by Internet, telephone or mail, as applicable, to ensure that your shares are represented at the Annual Meeting. In accordance with the Company’s Bylaws, the Chairman of the Company’s Board of Directors, Robert M. Cashill, will be retiring following the Annual Meeting. Mr. Cashill was first elected to the Boards of Directors of the Company and Investors Bank in 1998 and has served as Chairman since 2010. Mr. Cashill also served as President and Chief Executive Officer of Investors Bank from 2002 through his retirement in 2007. We are grateful for Mr. Cashill’s vision and leadership in the transformation of the Company and Investors Bank from a wholesale thrift to a retail commercial bank. In addition, and also in accordance with the Company’s Bylaws, Brian D. Dittenhafer, the Board’s Lead Independent Director, will be retiring following the Annual Meeting. Mr. Dittenhafer was first elected to the Boards of Directors of the Company and Investors Bank in 1997 and has served as Lead Independent Director since November 2011. We are grateful for Mr. Dittenhafer’s guidance and perspective throughout his years of service. We ask that you join us in thanking Mr. Cashill and Mr. Dittenhafer for their leadership and service to the Company. On behalf of the Board of Directors, officers and employees of Investors Bancorp, Inc., we thank you for your continued support. Sincerely, Kevin Cummings President and Chief Executive Officer PROXY STATEMENT