OLIN Corp — Director's Dealing 2010

May 17, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OLIN CORP (OLN)
CIK: 0000074303
Period of Report: 2010-05-13

Reporting Person: ROMPALA RICHARD M (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-05-13	Phantom Stock Units	$0	A	4428	Acquired		Common Stock (4428)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock $1 par value	500	Direct

Footnotes

F1: Includes 1,228 shares of Common Stock for annual retainer fees which the reporting person elected to defer under the Amended and Restated 1997 Stock Plan for Non-employee directors. Phantom shares of common stock are also credited periodically to a deferred stock account under the Amended and Restated 1997 Stock Plan for Non-employee directors and are settled in common stock or cash following the date the reporting person ceases to be a director.

F2: Security converts to common stock on a one-for-one basis.