OLIN Corp — Director's Dealing 2011

May 4, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OLIN CORP (OLN)
CIK: 0000074303
Period of Report: 2011-05-02

Reporting Person: Curley Stephen C (Vice President and Treasurer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-02	Common Stock $1 par value	S	3644	$26.10	Disposed	10642	Direct
2011-05-03	Common Stock $1 par value	M	5000	$17.35	Acquired	15642	Direct
2011-05-03	Common Stock $1 par value	S	5000	$25.24	Disposed	10642	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-05-03	Employee Stock Option Right to Buy	$17.35	M	5000	Disposed	2013-08-17	Common Stock (5000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock $1 par value	1973.4708	Indirect

Footnotes

F1: This transaction was executed in multiple trades at prices ranging from $26.09 to $26.12. The price reported above is the average weighted sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder full information regarding the number of shares and prices at which the transaction was effected.

F2: This transaction was executed in multiple trades at prices ranging from $25.18 to $25.32. The price reported above is the average weighted sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder full information regarding the number of shares and prices at which the transaction was effected.

F3: 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.