First, I'm no startup guru so take my advice with a large pinch of salt. But having worked at and close to major corporations they are often slow to make decis

First, I'm no startup guru so take my advice with a large pinch of salt. But having worked at and close to major corporations they are often slow to make decisions, and they often choose something that is not best value for money or best tech. If you really do have a disruptive solution you might want try to work together with (much) smaller companies. You will have an easier time to iterate your product with them since you are basically talking directly to (hopefully) passionate techies that understand the problems and threats and has some clue about possible solutions. Grow with these customers. You can make joint case studies about how you succeed together. This is always valueable to show other possible customers. Best of luck.