MASCO CORP /DE/ — Director's Dealing 2005

May 12, 2005

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MASCO CORP /DE/ (MAS)
CIK: 0000062996
Period of Report: 2005-05-10

Reporting Person: ISTOCK VERNE G (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2005-05-10	Non-Employee Director Stock Option	$30.65	A	8000	Acquired	2015-05-10	Common Stock (8000)	Direct

Footnotes

F1: The foregoing option is exercisable cumulatively in annual installments of 20% commencing 05/10/2006.

F2: Grant of option under Masco Corporation 1997 Non-Employee Directors Stock Plan, in transactions exempt under Rule 16b-3.