Friday's Analysts' Upgrades, Downgrades

AIG(AIG - Cramer's Take - Stockpickr) estimates lowered at UB to $3.25 from $3.60. Maintains neutral rating and $46 price target.

Activision(ATVI - Cramer's Take - Stockpickr) numbers raised at UBS. Fiscal 2009 EPS estimates raised at $1.31 from $1.09. Price target raised to $34 from $33. Maintains buy rating.

Cognizant(CTSH - Cramer's Take - Stockpickr) 2008 EPS estimates raised at UBS to $1.50 from $1.47. Maintains buy rating and $41 price target.

El Paso(EP - Cramer's Take - Stockpickr) numbers raised at Morgan Stanley. Shares of EP now seen reaching $24. Estimates also raised, to reflect the company's leverage to rising natural gas prices. Overweight rating.

Kaiser Aluminum(KALU - Cramer's Take - Stockpickr) numbers lowered at UBS. 2008 EPS estimates lowered to $4.80 from $5.20. Price target lowered to $88 from $96. Maintains buy rating.

Koppers Holdings(KOP - Cramer's Take - Stockpickr) price target raised at Jefferies to $49 from $47. Maintains hold rating and 2008 EPS estimates of $3.40.

Perini(PCR - Cramer's Take - Stockpickr) numbers raised at UBS. 2008 EPS estimates raised to $3.75 from $3.65. Price target raised to $44 from $43. Maintains neutral rating.

URS(URS - Cramer's Take - Stockpickr) numbers raised at UBS. 2008 EPS estimates raised to $2.80 from $2.75. Price target raised to $46 from $42. Maintains neutral rating.

Wilbros Group(WG - Cramer's Take - Stockpickr) numbers raised at UBS. 2008 EPS estimates raised to $1.95 from $1.90. Price target increased to $46 from $42. Maintains buy rating.