Mobike, ofo, SG Bike and GBikes have submitted their applications to the Land Transport Authority for a full licence to operate dockless bicycle services.
The end of the road has come for a third shared-bike operator, a homegrown outfit that had entered the market just six months ago.
The Government has issued new guidelines that require all new private developments to provide bicycle parking spaces.
Bike-sharing users who park indiscriminately more than three times will be temporarily banned from renting from all operators for a full year.
The Singapore-MIT Alliance for Research and Technology has found that dockless shared bicycles are only used for half an hour a day on average.
Bike-sharing firms in Singapore will soon come under a licensing regime as part of the Land Transport Authority's plan to curb indiscriminate parking.