NTR, the parent company of Greenstar UK and Ireland, is looking at selling off the waste management business, according to reports.
An NTR spokesperson said: "NTR plc is aware of some speculation regarding its interests in Greenstar UK. The group does not, as a matter of policy, comment on speculation but can confirm that it regularly explores strategic options for different parts of its portfolio of businesses as a matter of course."
The Irish Independent newspaper has named energy provider Bord na Mona and investor One51 as possible bidders. A spokesperson for Bord Na Mona could not comment on the speculation.
MRW has learned that bids are to be submitted for Wednesday 17 March.
The business is reportedly worth €250m (£227m).