The Financial Markets Authority is investigating a local fund manager over suspected market manipulation, according to sources.
The regulator is keeping lips sealed, saying: "We don't comment on whether or not we are investigating - particularly in secondary markets."
But the matter appears to be an open secret within the funds management industry.
The allegations are said to revolve around a single employee with a high profile firm, with the suspected activities involving manipulative trading that aimed to boost the firm's performance and adversely impact competitors' performance.
"The individual involved, there's been question marks about this person for a long time," a source says.