June 5 (Reuters) - Canaccord Genuity Group Inc's CF.TO board has rejected the C$1.13 billion ($840 million) take-private offer from a group led by the company's management, the Canadian firm said on Monday. Since last year, several companies have signed deals to exit the public markets as rate hikes and inflation took a toll on valuations. But regulatory scrutiny has torpedoed some high-profile deals, including Toronto-Dominion Bank's TD.TO proposed $13.4 billion acquisition of First Horizon Corp FHN.N.