X0306 4 2016-10-19 0 0000074303 OLIN CORP OLN 0001654938 VARILEK JAMES A OLIN CORPORATION 190 CARONDELET PLAZA, SUITE 1530 CLAYTON MO 63105 0 1 0 0 President, CAV & Services Common Stock $1 par value 29004 I By Family Trust Common Stock $1 par value 2214.938 I By Olin ESOP Trustee Phantom Stock Units 2016-10-19 4 J 0 3542.28 20.079 D Olin Common Stock 3542.28 0 I By Dow ESOP Trustee The figure represents shares of Olin Common Stock held under the Olin Common Stock Fund of the Olin Corporation Contributing Employee Ownership Plan (CEOP), a tax conditioned plan reflecting transactions exempt under Rule 16b-3, as reported by the CEOP Plan Administrator as of September 30, 2016. Each unit represents one share of Olin common stock. These phantom stock units were in a unitized stock fund, the Olin Stock Fund, held by The Dow Chemical Company (Dow) Employees' Savings Plan (CEOP), a tax conditioned plan. The phantom stock units were acquired in transactions exempt under Rule 16b-3, including 6.28 units acquired since the date of the reporting person's last ownership report. On the transaction date, Dow liquidated the Olin Stock Fund, and replaced the investment with an investment unrelated to Olin. Conversion price is the per share price reported by Dow for plan level transactions in the CEOP. /s/ T. E. Murphy, Attorney-in-Fact 2016-10-21