The NZX announced in the winter that it was looking into Fletcher.
"NZX will be making inquiries into today's disclosures, given FBU's continuous disclosure obligations under the listing rules," NZX head of market supervision Joost van Amelsfort said in July after a profit downgrade.
Separately, in accordance with NZX's routine surveillance processes, "trading ahead of today's announcement will be assessed in detail. This is in addition to NZX's ongoing investigation into the disclosure of FBU's previous earnings downgrade in March 2017", the stock exchange said.
Fletcher's acting chief executive is Francisco Irazusta, while a hunt is under way for a new boss to replace Mark Adamson.
Last week, Fletcher announced the resignation of chief people and communications officer Kate Daley.
On September 20, it said directors John Judge and Kate Spargo would retire.
Fletcher's annual meeting will be at the Auckland War Memorial Museum's events centre on October 25 at 10.30am.