X0306 4 2016-02-12 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 2016-02-11 4 P 0 7000 12.8663 A 29004 I By Family Trust Common Stock $1 par value 3536 I By Dow ESOP Trustee Common Stock $1 par value 581.0526 I By Olin ESOP Trustee Employee Stock Options (Right to Buy) 13.14 2016-02-12 4 A 0 71250 0.00 A 2026-02-11 Common Stock 71250 71250 D 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 January 15, 2016. The option vests in three annual installments beginning on February 12, 2017. /s/ T. E. Murphy, Attorney-in-Fact 2016-02-16