French billionaire businessman Bernard Arnault's family and his LVMH luxury goods group will donate 200 million euros ($226m) to help fix the cathedral.
The company said in a statement that the donation showed "solidarity with this national tragedy" and that funds would be used to rebuild this "extraordinary cathedral" and symbol of French heritage and unity. The roof of the 850-year-old building has collapsed but the two bell towers remain intact. Kering brands include Gucci and Yves Saint Laurent. "Faced with this tragedy, everyone wishes to give life back to this jewel of our heritage as soon as possible".
Total, a major French oil and gas company, on Tuesday pledged €100 million ($113 million) for Notre Dame's reconstruction.
Other donations began pouring in, with technology consultant Capgemini SE pledging 1 million euros.
A Twitter user who claims she took the heartwarming photo of a man swinging a little girl in front of the Notre Dame Cathedral in Paris an hour before a massive fire ravaged the historic cathedral is hoping she can find the man in the photo and share it with him.
The fire, which at one point threatened the entire edifice, was brought under control early on Tuesday about nine hours after it broke out.
French President Emmanuel Macron has promised to rebuild the site, saying Monday that France will launch an global fundraising campaign to assist with the effort. Their archrival, the Arnault family, responded minutes later with a pledge of 200 million euros and the architectural and design resources of their LVMH fashion conglomerate.
The elder Pinault, 82, is the world's 23rd richest person, with a fortune estimated at $37.3 billion, according to the Bloomberg Billionaires Index. French billionaire François Pinault has also pledged to donate around £86million, while the Mayor of Paris has said the city already had a budget of £70million in place for the restoration of its churches.