On the equity side, Corning, Incorporated (GLW) proved to be the largest contributor to performance for the period, returning 16.84%. As a global producer of residential and commercial building materials, glass-fiber reinforcements and engineered materials for composite systems, Corning has evolved over the last decade from being a manufacturer of optical fiber and cable into a broad-based supplier of optical solutions for the communications industry.
From Bill Frels' Mairs & Power Balance Fund First Quarter 2014 Commentary.