The eight-person panel reached a decision Tuesday. Its verdict is expected to be read shortly.
Marvin Gaye's children sued Thicke and Williams, alleging "Blurred Lines" copies their father's 1977 hit "Got to Give It Up." The singers have denied they copied Gaye's music.
Jurors began deliberations Thursday after hearing nearly a week of testimony comparing the songs.
Both Thicke and Williams testified during the trial.
An attorney for the Gaye family told jurors they could award millions of dollars in damages if they determined "Blurred Lines" copied the late singer's music.