X0306 4 2022-05-25 0001610950 Syneos Health, Inc. SYNH 0001260937 ABBRECHT TODD M C/O THOMAS H. LEE PARTNERS, L.P. 100 FEDERAL STREET, 35TH FLOOR BOSTON MA 02110 true Class A Common Stock 2022-05-25 4 A 0 2839 0 A 64587 D Represents an award of restricted stock units to be settled in shares which vests in full one year from the grant date, or, if earlier, the date of the next subsequent annual meeting following the grant date but only to the extent the reporting person is not re-elected as a non-employee director at such annual meeting, in each case, subject to continued service on the Issuer's Board of Directors. /s/ Todd M. Abbrecht 2022-05-27