The Evening Times understands 14 have a base in Glasgow while nine others have a presence in the UK.
The remaining 12 are understood to be international firms, with all confirming in recent days that they will proceed with bids.
It comes on the back of revelations from an Ipsos MORI poll that, despite not recognising some of the individuals they commemorate, members of the Glasgow public were in favour of retaining the statues.
Stakeholders, essentially businesses in the area, were less attached to the statues.
There was also a consensus of support for a water feature, with many in favour of a water feature, pedestrianisation and removal of red Tarmac and removal of the red tarmac.
However, campaigner group Restore George Square said it was concerning that the poll only drew from "the business community and a small handful of the public".
A spokesman added: "A quantitative poll would so obviously provide a much more accurate reflection of the views of Glaswegians. George Square's future is being decided largely by people who stand to benefit financially from its commercialisation."
Graeme Hendry, leader of Glasgow's opposition SNP group, added: "As Ipsos MORI says, its work is clearly qualitative and does not give a representative opinion of what Glaswegians think."