COLUMN-In age of 'superstar firms,' index investing logic holds: James Saft By: Reuters: Company News May 29, 2017 at 13:14 PM EDT May 29 (Reuters) - Even in the age of “superstar firms,” the logic of index investing holds. Read More >> Related Stocks: Alphabet-A Amazon.com Apple Facebook International Business Machines Wal-Mart Stores, Inc.