This was confirmed by US law enforcement, with the defendants including two doctors and an assistant to Perry.
According to US Attorney Martin Estrada, these people were part of a "broad underground criminal network" who distributed large quantities of the prescription drug ketamine to the actor as well as others.
In an LA news conference, Mr Estrada said, "These defendants took advantage of Mr Perry's addiction issues to enrich themselves".
He added: "They knew what they were doing was wrong. They knew what they were doing was risking great danger to Mr Perry, but they did it anyway. In the end, these defendants were more interested in profiting off Mr Perry than caring for his well-being".
Back in May, LA Police said that they were working closely with the US Drug Enforcement Administration and the US Postal Inspection Service to investigate why Matthew Perry had so much of the surgical anaesthetic in his system.
The use of ketamine has increased hugely in recent years, as a treatment for anxiety, depression and pain.
Meanwhile, people who were close to Matthew Perry, also revealed that he had been undergoing ketamine infusion therapy.
However, the medical report had said that Perry's last treatment which happened a week and a half before his death last year, did not explain the levels of ketamine found in his blood.
The report also stated that Mr Perry was being treated by two doctors, a psychiatrist and anaesthesiologist who had been working as his primary care physician. It also said that ketamine was listed as the primary cause of death, and was ruled to be accident, with drowning and other medical issues named as contributing factors.
Matthew Perry was one of the biggest television stars of his generation, having starred as the sarcastic Chandler Bing in NBC sitcom Friends from 1994 to 2004. He died last October aged 54.
