Three more women have come forward to allege historical sex offences against embattled billionaire Frank Stronach, CBC News has learned.

Stronach is facing four new charges, including rape and indecent assault. The charges stem from alleged incidents in Toronto in 1981 and 1983 and in the nearby hamlet of Gormley, Ont., in 1993, according to information shared by a clerk at a Brampton courthouse on Wednesday.

In all, 13 women have told police that Stronach, now 92, assaulted them. He faces a total of 17 criminal charges, including sexual assault and forcible confinement.

The earliest allegations against the Magna International founder date back to 1977, while the most recent assault is alleged to have occurred this past February.