The Shareholders Association, and Fletcher Building investors with a $35 million stake, plan to meet the chief executive and chairman to discuss the Gib supply crisis on Friday.
Sam Stubbs of Simplicity Living said he plans a "frank, positive discussion" about how the company is looking after shareholders in the midst of the shortage.
A meeting with Fletcher chief executive Ross Taylor and chairman Bruce Hassall is planned.
"Default KiwiSaver provider Simplicity and the NZ Shareholders Association are meeting with the Fletcher Building chair and CEO this week, to discuss the Gib supply crisis," said a statement from Stubbs, association chief executive Oliver Mander and Shane Brealey, also of Simplicity.
"Simplicity owns $35m of Fletcher Building shares on behalf of its members, representing 0.8 per cent of issued shares," the statement said.