The Government will not delay the passage of the bill allowing share floats of state-owned enterprises until after the Waitangi Tribunal has held its urgent hearings on the matter.
Ministers are insisting such sales would not affect the rights and interests of iwi and will not set aside any shares for future settlement.
But SOE Minister Tony Ryall says the Government could be prepared at a later stage to "stand in the market" and buy shares for some iwi as part of Treaty of Waitangi settlements.
The Government's refusal to budge on its timetable means the tribunal will be under pressure to hold its hearings before the law is passed.
Submissions must be in by June, the hearing will be in July and the tribunal plans an interim report in July.