After-hours buzz: IBM, Shack Shack, Sanmina & more By: CNBC.com News July 20, 2015 at 17:17 PM EDT Check out the companies making headlines after the bell Monday: IBM, Sanmina, Shack Shack & more. Read More >> Related Stocks: Exact Sciences Cor International Business Machines Rambus Inc Sanmina Corp Shake Shack Inc