It's best to keep everything in a single company to start with. Before going further with my answer, I'm compelled to tell you that launching multiple products *rarely* works and unless you have very significant prior success, most investors will take interpret diversification as a very negative...
There are a few different ways to try and get in touch with large institutional shareholders when they are looking to sell or pledge stock from their portfolio. One way is to reach out to them directly by email or phone. However, this can be difficult, as these types of investors may be difficult...