Nadezda Krejcirova reportedly said in a statement on Tuesday that she was offering R1m for information on each attempt, The Star reported on Wednesday.
This related to information provided to police that could lead to arrests, prosecution, and conviction of those responsible for the attacks.
Krejcirova is listed in the Prague Post as the Czech Republic’s tenth richest woman.
Last Tuesday, two people were killed and five others injured in an explosion at Krejcir’s Money Point business premises in Befordview on the East Rand.
In July, Krejcir was the target of an apparent assassination attempt outside Money Point.
Moments after he got out of his car a remote controlled gun installed behind the number plate of a car parked near his was fired at him. Krejcir escaped unharmed.
The SA Revenue Service said on Friday that all of Krejcir’s assets had been placed under the control of a curator.