CDW CORPORATION

CUSIP: 12512N105 Class: COM

GLENMEDE TRUST CO NA's Holding History (CIK: 0000314949)

Note: Option positions (PUT/CALL) are excluded.

Q4 2007
Shares 27,225 Value ($000) $1,914 Avg Close — Range —
Q3 2007
Shares 2,895 Value ($000) $252 Avg Close — Range —
Q2 2007
Shares 10,920 Value ($000) $927 Avg Close — Range —
Q1 2007
Shares 37,506 Value ($000) $2,303 Avg Close — Range —
Q4 2006
Shares 27,225 Value ($000) $1,914 Avg Close — Range —