Stock Trading History of Defontes Kenneth William Jr.

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 Defontes Kenneth William Jr. since year 2005. The trader's CIK number is 1304505. At the time of this reporting, Defontes Kenneth William Jr. is the Pres. & CEO, BGE; Sr. VP, CEG of Constellation Energy Group Inc (stock ticker symbol CEG).

Stock purchases, sales, and option exercises reported by insider *Defontes Kenneth William Jr.* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2008-02-12	CEG	Constellation Energy Group Inc	Option Exercise	3,640	50.96	185,494
2008-02-12	CEG	Constellation Energy Group Inc	Sale	3,640	96.12	349,889
2007-12-04	CEG	Constellation Energy Group Inc	Sale	3,697	99.07	366,271
2007-12-04	CEG	Constellation Energy Group Inc	Option Exercise	3,697	39.63	146,512
2007-08-15	CEG	Constellation Energy Group Inc	Option Exercise	3,697	39.63	146,512
2007-08-15	CEG	Constellation Energy Group Inc	Sale	3,697	82.03	303,260
2007-05-09	CEG	Constellation Energy Group Inc	Option Exercise	3,696	39.63	146,472
2007-05-09	CEG	Constellation Energy Group Inc	Sale	3,696	93.08	344,033
2007-02-14	CEG	Constellation Energy Group Inc	Option Exercise	5,334	31.21	166,474
2007-02-14	CEG	Constellation Energy Group Inc	Sale	5,334	74.89	399,472
2006-11-10	CEG	Constellation Energy Group Inc	Option Exercise	6,333	34.25	216,905
2006-11-10	CEG	Constellation Energy Group Inc	Sale	6,333	65.31	413,584
2006-08-03	CEG	Constellation Energy Group Inc	Option Exercise	7,193	28.81	207,230
2006-08-03	CEG	Constellation Energy Group Inc	Sale	7,193	57.92	416,652

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 Defontes Kenneth William Jr. (Pres. & CEO, BGE; Sr. VP, CEG of Constellation Energy Group Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.