SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
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*** Exercise Your Right to Vote ***
Important Notice Regarding the Availability of Proxy Materials for the
Stockholder Meeting to Be Held on June 11, 2019.
ONE KENDALL SQUARE
BUILDING 300, SUITE 201
CAMBRIDGE, MA 02139
Meeting Type: Annual Meeting
For holders as of: April 15, 2019
Date: June 11, 2019 Time: 8:30 AM EDT
Location: Goodwin Procter LLP
100 Northern Avenue
Boston, MA 02210
You are receiving this communication because you hold shares in the above named company.
This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side).
We encourage you to access and review all of the important information contained in the proxy materials before voting.
See the reverse side of this notice to obtain proxy materials and voting instructions.
Before You Vote
How to Access the Proxy Materials
Proxy Materials Available to VIEW or RECEIVE:
NOTICE AND PROXY STATEMENT ANNUAL REPORT
How to View Online:
Have the information that is printed in the box marked by the arrow (located on the following page) and visit: www.proxyvote.com.
How to Request and Receive a PAPER or E-MAIL Copy:
If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:
1) BY INTERNET: www.proxyvote.com
2) BY TELEPHONE: 1-800-579-1639
3) BY E-MAIL*: firstname.lastname@example.org
* If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow (located on the following page) in the subject line.
Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 28, 2019 to facilitate timely delivery.
How To Vote
Please Choose One of the Following Voting Methods
Vote In Person: Many stockholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares.
Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow (located on the following page) available and follow the instructions.
Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.
The Board of Directors recommends you vote FOR
1. To elect two director nominees to serve as Class I directors until the 2022 annual meeting of stockholders.
1a. Christopher Paige, Ph.D.
1b. Philip Vickers, Ph.D.
The Board of Directors recommends you vote FOR the following proposal:
2. To ratify the appointment of Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2019.
NOTE: Such other business as may properly come before the meeting or any adjournment thereof.