Which company located in New York City wherein 146 persons died in a fire on March 25, 1911?

The Triangle Waist Company factory occupied the 8th, 9th, and 10th floors of the 10-story Asch Building on the northwest corner of Greene Street and Washington Place, just east of Washington Square Park, in the Greenwich Village neighborhood of New York City.

On March 25, 1911, was the deadliest industrial disaster in the history of the city, and one of the deadliest in U.S. history.The fire caused the deaths of 146 garment workers – 123 women and girls and 23 men – who died from the fire, smoke inhalation, or falling or jumping to their deaths. Most of the victims were recent Italian and Jewish immigrant women and girls aged 14 to 23; of the victims whose ages are known, the oldest victim was 43-year-old Providenza Panno, and the youngest were 14-year-olds Kate Leone and Rosaria "Sara" Maltese.

Because the doors to the stairwells and exits were locked, a practice to prevent workers from taking unauthorized breaks and to reduce theft, many of the workers who could not escape from the burning building jumped from the high windows. The fire and bad publicity led to legislation requiring improved factory safety standards to prevent similar tragedies.

The 1901 building still stands today and is now known as the Brown Building. It is part of and owned by New York University. The building has been designated a National Historic Landmark and a New York City landmark.

For more information I recommend the book "Triangle The Fire That Changed America" by David Von Drehle.