High Quality Content by WIKIPEDIA articles! The Olin Corporation (NYSE: OLN) is a major manufacturer of ammunition (through Winchester Ammunition) and chlorine and sodium hydroxide (Olin Chlor-Alkali Products). Based in Clayton, Missouri, it traces its history to two companies, both founded in 1892: Franklin W. Olin`s Equitable Powder Company of East Alton, Illinois and the Mathieson Alkali Works of Saltville, Virginia into which Olin merged, although keeping the Olin name first. After being headquartered for many years in Stamford, CT, it is now headquartered in Clayton, Missouri.