3M (NYSE: MMM) shares closed at $171.37 on October 20, up approximately 5.8%. The rally followed stronger-than-expected earnings, higher guidance and an expanded commercial agreement to supply Amazon with optical-connectivity and other data-center products. 3M (NYSE: MMM) shares gained after the company exceeded third-quarter profit estimates and raised its full-year outlook. Adjusted earnings reached $2.50 per share, compared with analysts' estimate of approximately $2.38. An expanded agreement to supply A ...