What actors and actresses played the most supporting roles in films and TV shows?

Some of the most prolific actors and actresses known for their supporting roles include character actors like J.K. Simmons, who has appeared in numerous films and TV shows, and Octavia Spencer, known for her impactful supporting performances. Others like Steve Buscemi and Frances McDormand have built impressive careers with a mix of leading and supporting roles. Additionally, actors such as Alan Rickman and Viola Davis are celebrated for their memorable supporting performances that often steal the spotlight.