Some 350 bags of heroin were also seized during the arrests in Lower Manhattan, unnamed police officials were quoted by US media as saying.
Philip Seymour Hoffman, 46, was found dead at his Greenwich Village home on Sunday with a syringe in his arm.
Dozens of suspected heroin bags were found near his body.
Some were stamped with the ace of hearts and the ace of spades, which are said to be brand names for heroin that street dealers use.
No definitive cause of death has been given, as police try to piece together his final hours using surveillance video and inspecting computers found in his home.
Police say the heroin found in Hoffman’s apartment was not mixed with the synthetic narcotic fentanyl.
Fentanyl has been blamed for a number of recent overdose deaths.
Philip Seymour Hoffman is reported to have withdrawn a total of $1,200 in six visits to a cash machine the day before his death.
The acting world has been paying tribute to a man described as one of the finest actors of his generation.
Lights along theatre marquees on New York’s Broadway are due to be dimmed later in honor of Philip Seymour Hoffman, who earned three Tony award nominations for his work in theatre work in the city.
Philip Seymour Hoffman, who is survived by his partner Mimi O’Donnell and their three children, has spoken candidly in the past of his struggle against drug addiction.
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