Which regulatory body is responsible for thesurveillanceof trading and market-related activities of participants on Canadian...

TheCanadian Investment Regulatory Organization (CIRO)is responsible for overseeing trading and market-related activities of participants on Canadian equity marketplaces. CIRO conducts surveillance to ensure compliance with rules, regulations, and fair market practices.

Other options:

OBSI (Ombudsman for Banking Services and Investments): Handles disputes between financial institutions and their clients but does not conduct trading surveillance.

OSFI (Office of the Superintendent of Financial Institutions): Regulates and supervises federally regulated financial institutions, focusing on their solvency.

CSA (Canadian Securities Administrators): Coordinates securities regulation across Canada but does not directly monitor trading activities.

References:

Volume 1, Chapter 3:The Canadian Regulatory Environment, section on "Market Surveillance and Trading Oversight" explains CIRO's role​.