X0306 4 2018-08-21 0 0000074303 OLIN CORP OLN 0001727635 FLAUGHER BRETT A C/O OLIN CORPORATION, 190 CARONDELET PLZ STE 1530 CLAYTON MO 63105 0 1 0 0 VP & President, Winchester Common Stock $1 par value 2018-08-21 4 A 0 1000 0.00 A 28129 D Common Stock $1 par value 7975 I By Trust Common Stock $1 par value 3926.8195 I By 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 June 29, 2018. /s/ T. E. Murphy, Attorney-in-Fact 2018-08-23