The Biggest Buybacks: Did They Work? By: CNBC.com News November 14, 2011 at 09:03 AM EST Stock buybacks can be seen as a sign of confidence or the need to juice the stock. Either way, do they work? Here's a look at recent buybacks - by the numbers. Read More >> Related Stocks: Amgen ConocoPhillips Hewlett-Packard International Business Machines JPMorgan Chase & Co Kimberly-Clark Lowe's Companies Merck & Co Procter & Gamble Wal-Mart Stores, Inc.