OLIN Corp — Director's Dealing 2011

May 13, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OLIN CORP (OLN)
CIK: 0000074303
Period of Report: 2011-05-11

Reporting Person: MCINTOSH JOHN L (Sr. Vice President, Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-11	Common Stock $1 par value	M	21500	$18.52	Acquired	41751	Direct
2011-05-13	Common Stock $1 par value	S	21500	$23.90	Disposed	20251	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-05-11	Employee Stock Option Right to Buy	$18.52	M	21500	Disposed	2014-02-11	Common Stock (21500)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock $1 par value	7873.1086	Indirect

Footnotes

F1: The transaction was executed in multiple trades at prices ranging from $23.90 to $23.97. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2: 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 29, 2011.