David Miller, 56, died at his house on Patterdale Walk, Northampton, in the early hours of Tuesday morning.
Zena Kane, 35,  Ian Cuthbertson, 49, and 37-year-old Michael Hallett, all of no fixed address, have appeared at Northampton Magistrates' Court and will appear at Northampton Crown Court on Friday.
Three others are being questioned.
Three people have been charged with with the murder of a man who was stabbed to death at his home.