There isn't an upside. Theoretically it means that certain investment vehicles must buy shares of your company. But they do so from the open market; not from of

There isn't an upside. Theoretically it means that certain investment vehicles must buy shares of your company. But they do so from the open market; not from offerings. Otherwise, it's just a matter of prestige: the S&P lists are just the X largest (by stock value) profitable publicly traded companies. The difference between S&P X00 and Nasdaq: S&P is just a list of publicly traded companies; it is not a stock exchange. Nasdaq is an actual stock exchange, like the NYSE.