Short Answer: Build a deep network.

This is why network science is my primary focus and the top companies today Google, Amazon, Facebook, Linkedin are heavily leverage networks.

There is no "contact here for partnerships" form for large diversified organizations. Unless it is a very specific program, they don't want an inflow of un-vetted opportunities.

So how do you do it? You reach out to one of your advisors or investors(presuming you have some) and ask them if they know the someone at Company X. If they know the COO of Best Buy and can make an intro than that is the quickest way to get to the right department.

This is a top-down approach and generally works faster and better than a bottom-up approach.