In the latest look at the underlying components of the S&P 500 ordered by largest market capitalization, Bank of New York Mellon Corp (BK) has taken over the #102 spot from Allergan, Inc (AGN), according to The Online Investor. Click here to find out the top S&P 500 components ordered by average analyst rating Market capitalization is an important data point for investors to keep an eye on, for various reasons.