Google and its parent Alphabet Chief Sundar Pichai announced a Rs 135 crore assistance.
Satya Nadella-headed Microsoft who did not quantify the funding also contributed.
Amazon will be donating oxygen concentrators & other equipment to several hospitals.
Sun Microsystems' co-founder Vinod Khosla promised help with a plane load of oxygen.
American vaccine maker Gilead also announced a Rs 20-crore worth of 4.5 lakh Remdesivir vials.
Blackstone Chief Stephen A Schwarzman committed USD 5 Million (Rs 40 Crore).