2021 Annual Meeting of Stockholders

Thursday, May 13, 2021 at 10:00 a.m. EDT

In light of public health concerns related to the coronavirus outbreak, the 2021 Annual Meeting of Stockholders will be held in a virtual meeting format only.

Stockholders of record as of the record date will be able to attend and participate in the Annual Meeting online by accessing www.virtualshareholdermeeting.com/HSIC2021. To join the Annual Meeting, you will need to have your 16-digit control number, which is included on your Notice Regarding the Availability of Proxy Materials or on your proxy card (if you received a printed copy of the proxy materials). In the event that you do not have a control number, please contact your broker, bank, or other nominee as soon as possible and no later than May 11, 2021, so that you can be provided with a control number and gain access to the meeting. Stockholders may vote electronically and submit questions online while attending the Annual Meeting.

The live audio webcast of the Annual Meeting will begin promptly at 10:00 a.m., Eastern Daylight Time. Online access to the audio webcast will open approximately thirty minutes prior to the start of the Annual Meeting to allow time for you to log in and test the computer audio system. We encourage our stockholders to access the meeting prior to the start time. If you encounter any difficulties accessing the online Annual Meeting during the check-in or meeting time, please call the technical support number that will be posted on the online Annual Meeting log in page at www.virtualshareholdermeeting.com/HSIC2021.

To submit questions during the meeting, stockholders may log into the virtual meeting website with their 16-digit control number, type the question into the “Submit a Question” field, and click submit. Only stockholders with a valid control number will be allowed to ask questions.

To vote your shares at the Annual Meeting online, please visit www.virtualshareholdermeeting.com/HSIC2021 and enter the 16-digit control number included in our Notice Regarding the Availability of Proxy Materials or on your proxy card (if you received a printed copy of the proxy materials).