Three of them bought "equipment" for Ahmed Coulibaly, who shot dead a policewoman on the outskirts of the French capital before taking hostages at the store a day later, prosecutor Francois Molins said.
At least one of the suspects had met Coulibaly in prison, he added.
All four are being held in custody while further inquiries are carried out.
Mr Moulins said police were investigating who was responsible for a video of Coulibaly, which was edited and released on the internet several days after he and the two Charlie Hebdo attackers were shot dead by officers.
n the video, Coulibaly pledged allegiance to the Islamic State group, which has seized control of large areas of Syria and Iraq.
Mr Moulins also claimed the attacks on the supermarket and satirical magazine Charlie Hebdo were co-ordinated.
The Charlie Hebdo attack was carried out by brothers Said and Cherif Kouachi, who killed 12 people.
Last weekend the two brothers and Coulibaly were buried in unmarked graves.
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