X0306 4 2019-05-06 0 0000074303 OLIN CORP OLN 0001729998 VERMILLION TERESA M C/O OLIN CORPORATION, 190 CARONDELET PLZ STE 1530 CLAYTON MO 63105 0 1 0 0 VP & Treasurer Common Stock $1 par value 2025.4 D Common Stock $1 par value 119.4916 I By ESOP Trustee Phantom Stock Units 2019-05-06 4 I 0 448.2948 21.00 A Common Stock 448.2948 448.2948 D Amount includes 168.40 shares held under the Olin Corporation Dividend Reinvestment Plan acquired periodically in transactions, which are exempt from Section 16(b). 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 April 30, 2019. Each phantom stock unit is the economic equivalent of one share of Olin Common Stock. Phantom stock units are payable in cash following the reporting person's termination of employment with Olin, and may be transferred by the reporting person into an alternative investment account at any time. Phantom stock units acquired in multi-fund benefit plan. /s/ T. E. Murphy, Attorney-in-Fact 2019-05-08