The film, which took 12 years to complete, already best drama, best director for Linklater and best supporting actress for Patricia Arquette at the Golden Globes a week ago and is nominated in six categories at the upcoming Oscars.
Linklater paid tribute to the critics in his acceptance speech at the award show, saying he would have never sensed any friction in the relationship between reviewers and filmmakers, reported the Guardian.
Michael Keaton bagged the actor of the year award for his performance as a faded Hollywood actor in dark-comedy 'Birdman', while Julianne Moore was declared actress of the year for her role of a professor suffering from Alzheimer's disease in 'Still Alice'.
Actress Scarlett Johansson's science fiction thriller 'Under the Skin ' won the award for British film of the year. J K Simmons was announced as supporting actor of the year for his performance in 'Whiplash'.
Two-time Academy-winner Miranda Richardson was awarded the Dily Powell award for excellence in films. She is known for her roles in 'Damage', 'Enchanted April', TV film 'Fatherland' and ' Tom & Viv'.