Form: 144

Report of proposed sale of securities

March 6, 2026

144: Filer Information

144: Issuer Information

144: Securities Information

Title of the Class of Securities To Be SoldName and Address of the BrokerNumber of Shares or Other Units To Be SoldAggregate Market ValueNumber of Shares or Other Units OutstandingApproximate Date of SaleName the Securities Exchange
Class A Common
J.P. Morgan Securities LLC
270 Park Avenue Floor 10
New York   NY   10017
253261129669617461758903/06/2026
Nasdaq


Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the ClassDate you AcquiredNature of Acquisition TransactionName of Person from Whom AcquiredIs this a Gift?Date Donor AcquiredAmount of Securities AcquiredDate of PaymentNature of Payment *
Class A Common03/06/2026Stock option exerciseIssuerCheckbox not checked16149003/06/2026Cash
Class A Common03/01/2026Restricted Stock VestingIssuerCheckbox not checked9177103/01/2026NA

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.



Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of SellerTitle of Securities SoldDate of SaleAmount of Securities SoldGross Proceeds
Michael P. Ellenbogen
500 Totten Pond Road, 4th Floor
Waltham   MA   02451
Common Stock12/15/202580745557922
Michael P. Ellenbogen
500 Totten Pond Road, 4th Floor
Waltham   MA   02451
Common Stock01/16/202680745500990
Michael P. Ellenbogen
500 Totten Pond Road, 4th Floor
Waltham   MA   02451
Common Stock02/17/202680745441498

144: Remarks and Signature