Who Won the 2018 SAG Award for Supporting Actress?

Allison Janney

I, Tonya
Date: 
Jan 21, 2018
Site: 
Shrine Auditorium - Los Angeles, CA
For: 
I, Tonya
Runner Up: 
Mary J. Blige (Mudbound); Hong Chau (Downsizing); Holly Hunter (The Big Sick); Laurie Metcalf (Lady Bird)