GATX CORP — Director's Dealing 2005

Aug 17, 2005

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: GATX CORP (GMT)
CIK: 0000040211
Period of Report: 2005-08-15

Reporting Person: MUCKIAN WILLIAM M (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2005-08-15	Common Stock	M	3500	$33.4688	Acquired	7284.3	Direct
2005-08-15	Common Stock	M	4200	$30.4688	Acquired	11484.3	Direct
2005-08-15	Common Stock	M	5000	$31.735	Acquired	16484.3	Direct
2005-08-15	Common Stock	M	5000	$24.17	Acquired	21484.3	Direct
2005-08-15	Common Stock	S	15950	$41.1467	Disposed	5534.3	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2005-08-15	1997 NQ Stock Option (Right to Buy)	$33.4688	M	3500	Disposed	2007-10-24	Common Stock (3500)	Direct
2005-08-15	2000 NQ Stock Option (Right to Buy)	$30.4688	M	4200	Disposed	2010-03-10	Common Stock (4200)	Direct
2005-08-15	2002 NQ Stock Option (Right to Buy)	$31.735	M	5000	Disposed	2012-04-26	Common Stock (5000)	Direct
2005-08-15	2002 NQ Stock Option (Right to Buy)	$24.17	M	5000	Disposed	2012-07-26	Common Stock (5000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock 401(k)	4398.505	Indirect

Footnotes

F1: 50% of option granted may be exercised commencing 1 year from the date of the grant, an additional 25% commencing 2 years from the date of the grant and the remaining 25% commencing 3 years from the date of the grant.

F2: 50% of option granted may be exercised commencing 1 year from the date of the grant, an additional 25% commencing 2 years from the date of the grant and the remaining 25% commencing 3 years from the date of the grant.