Mainly what I'm thinking of is that InGen is going to have to basically corner the market on amber to have even a chance of finding dino blood, and even with all the resources they have, it ain't going to be enough to buy all that amber, but given that they're not looking to profit directly from the amber trade, I imagine they could buy the majority stock in company A, which buys the majority stock in company B, which buys the majority stock in company C, then companies A, B, and C collectively buy the majority stock of company D, which then buys the majority stock of companies E, F, and G, so on and so forth. I even came up with a name for this system--a lateral conglomerate. An InGen-controlled mining company will focus its business model on doing as much mining as it can and send whatever amber it finds to an InGen-controlled jeweler (with documentation of where it was found and the age of the rock and whatnot) which will then sift the biting insects out and send them to a special InGen-controlled jeweler which then examines them under electron microscope for signs of having fed prior to death, with only those ones being sent on to InGen proper.
It definitely defies the spirit of anti-trust laws--as it would prevent anyone from coming along and competing with InGen in the dinosaur-making business--but I'm thinking it doesn't defy the letter of it.