Pall Corp., the Port Washington-based company seen here on April 30, 2012, exits the Standard & Poor's 500 index Friday, Aug. 28, 2015, in advance of being acquired by Danaher Corp., leaving Long Island with just three corporations on the iconic stock index. Photo Credit: Barry Sloan Pall Corp., the Port Washington-based company seen here on April 30, 2012, exits the Standard & Poor's 500 index Friday, Aug. 28, 2015, in advance of being acquired by Danaher Corp., leaving Long Island with just three corporations on the iconic stock index.