Stock Trading History of Robertson Greg A

The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Robertson Greg A since year 2005. The trader's CIK number is 1283659. At the time of this reporting, Robertson Greg A is the VP, Chief Accounting Officer of Waste Management Inc . (stock ticker symbol WMI). See this page for all insider trading activities at Waste Management Inc .

Stock purchases, sales, and option exercises reported by insider *Robertson Greg A* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2008-05-14	WMI	Waste Management Inc	Sale	41	37.13	1,522
2008-03-05	WMI	Waste Management Inc	Sale	36	33.48	1,205
2008-02-20	WMI	Waste Management Inc	Sale	386	33.42	12,899
2008-01-28	WMI	Waste Management Inc	Sale	210	31.10	6,531
2008-01-28	WMI	Waste Management Inc	Sale	210	31.10	6,531
2006-02-21	WMI	Waste Management Inc	Sale	41,695	33.95	1,415,712
2006-02-21	WMI	Waste Management Inc	Option Exercise	50,000	19.08	954,083

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Robertson Greg A (VP, Chief Accounting Officer of Waste Management Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.