Mamadou Soumare, one of the men who lost his family in a devastating Bronx fire last March, took the first steps Tuesday to file a $100 million negligence lawsuit against the city.

Soumare, who lost his wife and four children in the Woodycrest Avenue fire, filed a notice of claim, reserving his right to sue in the future.

The claim identifies the FDNY, Department of Buildings, the Department of Housing and Moussa Magassa — the homeowner who also lost five children — as potential defendants.

The claim charges that the Fire Department failed to respond in a timely manner. The FDNY was on the scene about three minutes after receiving a 911 call from a neighbor.

The claim also says Magassa was negligent in his ownership and operation of the premises.

Soumare's lawyer says the claim was filed in case his client needed to take action against the city in the future, but he says Soumare will not sue his friend Magassa.