All government contributors are from the National Informatics Centre. We have learnt that each of the 33 industry contributors (separate from industry leaders) is either from 1mg or MakeMyTrip (MMT and Goibibo merger in 2016): 13 are from Goibibo, 10 are from MakeMyTrip (one of them left MMT in April), 3 from 1mg and 1 from NITI Aayog. We could not find details for 6 of the contributors, though one of them is from Go-MMT.
Who made Aarogya Setu? A list | MediaNama