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Commission files proceedings against GIB manufacturer Winstone Wallboards for anti-competitive conduct

The Commerce Commission has filed proceedings under sections 27 and 36 of the Commerce Act in the Auckland High Court against Winstone Wallboards, a subsidiary of Fletcher Building that manufactures and supplies GIB-branded plasterboard. The Commission alleges that Winstone’s use of retroactive tiered rebates in its plasterboard supply agreements with building supplies merchants between 2017 and 2022 breached the Commerce Act.

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