One has been charged with manslaughter and people-trafficking, and the nine others were to be taken before a judge who will decide whether to charge them as well, the source said, asking not to be named.
Police had arrested 15 people suspected of involvement overnight Sunday to Monday, but released five of them without charges.
The death of the 27 in late November was the worst disaster in the Channel since 2018, when the narrow strait became a key route for migrants from Africa, the Middle East and Asia who have been increasingly using small boats to reach England from France.
Among the 27 — aged seven to 47 — were 16 Iraqi Kurds, four Afghans, three Ethiopians, one Somali, one Egyptian and one Vietnamese migrant.
Only two people survived the disaster, which sparked tension between the British and French governments, with President Emmanuel Macron vowing France would not allow the Channel to become a “cemetery”.