Fletcher Building shares sank 8.4 per cent after downgrading its profit guidance and announcing the departure of CEO Mark Adamson.
The stock dropped to a 16-month low of $7.41.
Francisco Irazusta was named as interim CEO and chairman Ralph Norris said the board deemed it the right time for new leadership. The announcement came with a profit warning and a $220 million impairment.
The profit downgrade follows a 15 per cent cut to guidance to full-year earnings in March as a result of overruns at two major construction projects.