I don’t know the answer to this. Obviously he must be very involved in his overt efforts to influence the american political reality.
If a specific small-size investment in one of how many companies screwing with US public opinion is of the same caliber, I truly doubt it. I cannot imagine he has time for a 5-digit affair.
You might not remember how much you spent on a steak, but you will recall putting a quarter in a parking meter. It is the purpose of the investment, not the amount which makes it significant.