Montreal-based Amaya Gaming Group said the raids were related to the company's $4.9-billion purchase of PokerStars and FullTilt Poker last summer.
The company said in a statement it's co-operating with Autorité des marches financiers (AMF), the Quebec agency that oversees the province's securities industry.
The AMF carried out raids at three major companies in Montreal this week — Amaya, Manulife Financial and Canaccord Genuity.
The AMF's Sylvain Théberge would only confirm the raids, and said no arrests were made. The RCMP assisted in the operation.
Amaya's offices in Pointe-Claire on Montreal's West Island were raided on Wednesday.
Amaya said that, to its knowledge, the investigation doesn't involve allegations of wrongdoing by the corporation.
Manulife Financial and Canaccord Genuity aiso said they were aware of the investigation and were co-operating, but declined to provide details.
"All questions should be directed to the AMF," Manulife said in an email.