Annual Shareholders Meeting

Date: Tuesday, September 15, 2020

Time: 9:00 am Eastern

Virtual Meeting Location: www.virtualshareholdermeeting.com/ATNI2020

ANNUAL SHAREHOLDERS MEETING HAS BEEN CHANGED TO A VIRTUAL ONLY MEETING

The format of the Annual Meeting has been changed to a virtual only meeting, due to the public health impact of the coronavirus pandemic and to prioritize the health and well-being of meeting participants. You are entitled to attend the Annual Meeting only if you were a shareholder of HMS as of the close of business on April 2, 2020, the Record Date, or hold a valid proxy for the Annual Meeting. To be admitted to the meeting at www.virtualshareholdermeeting.com/HMSY2020, you must enter the 16-digit voting control number found on your proxy card, voting instruction form, or notice of internet availability of proxy materials. Once admitted, you may vote, examine the list of shareholders and ask questions during the Annual Meeting by following the instructions available on the meeting website during the meeting. A list of all shareholders entitled to vote at the Annual Meeting will be made available during the meeting at www.virtualshareholdermeeting.com/HMSY2020.