OLIN Corp — Director's Dealing 2010

May 4, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OLIN CORP (OLN)
CIK: 0000074303
Period of Report: 2010-04-30

Reporting Person: PAIN GEORGE H (Vice President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-04-30	Common Stock $1 par value	M	23500	$16.52	Acquired	35953.48	Direct
2010-04-30	Common Stock $1 par value	M	17084	$14.28	Acquired	53037.48	Direct
2010-04-30	Common Stock $1 par value	S	40584	$21.44	Disposed	12453.48	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-04-30	Employee Stock Option Right to Buy	$16.52	M	23500	Disposed	2017-02-12	Common Stock (23500)	Direct
2010-04-30	Employee Stock Option Right to Buy	$14.28	M	17084	Disposed	2019-02-04	Common Stock (17084)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock $1 par value	463.4865	Indirect

Footnotes

F1: Fractional amount represents shares held under the Olin Corporation dividend reinvestment plan.

F2: This transaction was executed in multiple trades at prices ranging from $21.20 to $21.58. 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.

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 30, 2010.

F4: The unexercised options for 34,166 shares vest in two equal installments on February 5, 2011 and February 5, 2012.