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Pomerantz said it was conducting the probe on behalf of Naspers' shareholders after a unit of the media and e-commerce giant said it would investigate claims of improper payments to a TV channel, ANN7, when it belonged to the wealthy Gupta family, which has close ties to President Jacob Zuma.
Shares in Naspers dropped more than 4 percent in late afternoon deals in Johannesburg, weighed down by both the investigation and a sell-off in Tencent Holdings. Naspers holds a third of Tencent's stock
"The investigation concerns whether Naspers and certain of its officers and/or directors have engaged in securities fraud or other unlawful business practices," Pomerantz said in a statement.
Naspers did not respond immediately to a request for comment.
On Monday Naspers Chief Executive Bob van Dijk told Reuters the company backed the decision of its unit, Multichoice, to look into whether there had been "corporate governance failures" after a group of investigative journalists raised questions about payments to ANN7.
The Gupta brothers sold ANN7 in August. They have been accused by an anti-graft watchdog of using their friendship with Zuma to amass wealth and seek favours for their business partners. Both the Guptas and Zuma have denied any wrongdoing.
(Reporting by Tiisetso Motsoeneng; Editing by James Macharia and Gareth Jones)
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)