Thermo Fisher Scientific (TMO)

Stocks with market values of at least $200 billion are where the really big money places its bets. These mega caps are Wall Street's favorites.

A lower-than-expected reading on consumer sentiment had the major indexes erasing weekly gains.

Billionaire investors were busy during the second quarter of 2021. Here are 25 companies, of various shapes and sizes, that were some of their most re…