2015, Dow Chemical Company announced that it would spin off its chlorine and epoxy businesses and merge them with Olin Corporation.<ref name="2015:nytimes.com">David Gelles "Dow Chemical to Merge Unit With Olin", New York Times, March 27, 2015.</ref> Dow earned around $5 billion in the deal including $2 billion in cash, with the new Olin to have revenue of around $7 billion, with Olin chairman and CEO Joseph D. Rupp to lead the new larger company. Separately, Dow also agreed to supply Olin with ethylene. On October 5, 2015, Olin successfully acquired Dow's U.S. Gulf Coast Chlor-Alkali and Vinyl, Global Chlorinated Organics, and Global Epoxy business units, in addition to 100 percent interest in the Dow Mitsui Chlor-Alkali joint venture. As of 2016, Olin president and CEO was John E. Fischer. In 2016, an Olin Corp. facility on Dow Chemical property in Plaquemine near Baton Rouge had a chlorine leak which led to the evacuation of the Dow plant. In 2016, Olin Corp, which was still based in Missouri, announced it was laying off 100 workers, or around 80% of the facility's workforce, at a factory north of downtown Henderson, also halting chlorine production at the site. It also stopped production of lye, with the facility to be remade into a bleach factory and distribution center for various industrial chemicals. Olin also scaled back chlorine production at other factories in New York and Texas. In 2019, Olin announced it was closing two plants in Texas by the end of 2020. It was reported in 2020 that Sachem Head Capital Management had built a stake in Olin Corporation at 9.4%. At that time, Olin remained headquartered in Clayton, Missouri and had 12 directors on its board. In 2020, Scott M. Sutton was selected by the Olin board to succeed Fischer as CEO and president, with Fischer becoming executive chairman. As of 2021, the Olin Chemical Superfund Site was still undergoing cleanup under Olin Corporation, with the EPA having managed the site 2006, and the 53-acre facility purchased by Olin in 1980. The EPA was overseeing the cleanup of a Olin Corp. facility in East Alton by 2021, taking public comments on Olin's proposed cleanup plan to contaminated soil and groundwater in July 2021. In 2021, Olin shut down half of its diaphragm-grade chlor alkali production at its facility in McIntosh, Alabama. In 2022, Olin created a joint venture with Plug Power Inc., to