The NZX said it had suspended the quotation of shares in CSM - a listed shell part-owned by Sistema founder Brendan Lindsay - pending more information about its backdoor listing plans.
CSM said last week it had reached an agreement to buy The Good Brand Co, a marketing company, and Me Today, which is backed by Grant Baker and Stephen Sinclair, who founded vodka company 42 Below with Geoff Ross.
Both The Good Brand Co and Me Today operate in the health and wellness sector.
The NZX said on Friday that it had applied a trading halt while discussing with CSM its proposed acquisition of the two companies.
The acquisition constitutes a reverse listing which, in accordance with NZX guidance, triggers a suspension of quotation.