OLIN Corp — Director's Dealing 2009

May 6, 2009

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: OLIN CORP (OLN)
CIK: 0000074303
Period of Report: 2009-05-01

Reporting Person: Ennico Dolores J (Vice President)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock $1 par value	5216	Direct
Common Stock $1 par value	3886.6461	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Employee Stock Option (right to buy)	$23.78	2015-02-09	Common Stock (9600)		Direct
Employee Stock Option (right to buy)	$20.68	2016-02-08	Common Stock (23550)		Direct
Employee Stock Option (right to buy)	$16.52	2017-02-12	Common Stock (20250)		Direct
Employee Stock Option (right to buy)	$20.29	2018-02-06	Common Stock (15750)		Direct
Employee Stock Option (right to buy)	$14.28	2019-02-04	Common Stock (25000)		Direct
Restricted Stock Units	$		Common Stock (3334)		Direct
Restricted Stock Units	$		Common Stock (3333)		Direct

Footnotes

F1: The figure shown represents shares of Olin Common Stock acquired on a periodic basis under the Olin Corporation Contributing Employee Ownership Plan (CEOP), a tax-conditioned plan, and held in the Olin Common Stock Fund of the CEOP, in a transaction exempt under Rule 16b-3, and is based on information provided by the Plan Administrator as of April 30, 2009.

F2: Option vests in three annual installments beginning on 2/13/08.

F3: Option vests in three annual installments beginning on 2/7/09.

F4: Option vests in three annual installments beginning on 2/5/10.

F5: Right to acquire shares of common stock vesting on 2/7/11.

F6: Security converts to common stock on a one-for-one basis.

F7: Right to acquire shares of common stock vesting on 2/5/12.