Cesar Lopez and Mark Aceves, both 24, were found guilty in the shooting deaths of three men during what authorities described as an overnight drug robbery.
A third suspect, Abraham Molina, is also connected to the case and is scheduled to stand trial in 2027.
Investigators allege Molina carried out the shootings.
Lopez and Aceves are expected to return to court for sentencing on June 3.
Both men face life in prison without the possibility of parole.