It then issued a report on Capitec Bank Holdings Ltd. in January, causing the lender's shares to fall as much as 25%, although the stock has since recovered all its losses. On Wednesday, it took aim at property firm NEPI Rockastle Plc, prompting a one-day drop of 14%, some of which has been regained. Both Capitec and NEPI refuted the Viceroy's reports as misleading, while regulators described Viceroy as "reckless" with the Capitec release.
"They generate a report and their disclaimer says that this is an educational report," Kganyago said at a lunch with editors in Johannesburg. "So you go and take a position on a stock and then you 'educate' people about the stock and you can get away with it. They are a hit squad."
Fraser Perring of Viceroy, who is based in London and New York, didn't immediately respond to a request for comment.
Viceroy is the subject of a market-manipulation investigation in Germany after its report on ProSiebenSat.1 Media SE caused a more than 8% decline in the stock.
A study released in July by Intellidex (Pty) Ltd., a researcher with offices in Johannesburg, London and Boston, accused Viceroy of copying an analysis done on Steinhoff six months earlier by a money manager. At the time, Viceroy said it receives data anonymously, which it then tests and includes in its research.