Wednesday's Analysts' Upgrades, Downgrades

Change in Ratings

Costco(COST Quote) downgraded at Goldman Sachs to neutral from buy due to valuation. Note outpreformance vs. S&P 500 and valuation vs. five-year average. See risk/reward as less compelling. Price target at $71.

Golar LNG(GLNG Quote) downgraded at Jefferies to a hold rating from buy. Price target holds at $25 while fiscal-year 2008 EPS estimates dip to 30 cents from 37 cents.

Tenet Healthcare(THC Quote) upgraded at Jefferies to buy rating from hold. Price target lifts $4.50 from $3 and fiscal-year 2008 EPS estimates raised to -2 cents from -8 cents.

Ultra Petroleum(UPL Quote) downgraded at JPMorgan from overweight to neutral. Business is good, but the company has little leverage to natural gas, and margins can't move much higher from here.

Xilinx(XLNX Quote) upgraded at UBS to buy rating from neutral. Price target lifts $27 from $24.50 and fiscal-year 2008 EPS estimates hold at $1.28.

Stock Comments/EPS Changes

AutoZone(AZO Quote) target increased at Goldman to $139 from $130. Earnings were well ahead of estimates despite unsuccessful promotions. Maintained buy rating.

CBS(CBS Quote) estimates raised at Morgan Stanley through 2009. Company seeing higher profits at the outdoor segment, and TV margins could also improve. Equal-weight rating and $26 price target.

Herbalife(HLF Quote) target raised at Goldman to $53 from $50 following strong fourth-quarter results. Revenue and earnings both ahead of expectations and guidance was above consensus. Maintained buy rating.

Masimo(MASI Quote) target price raised at Deutsche Bank from $39 to $41 following solid fourth-quarter results and 2008 guidance.

Office Depot(ODP Quote) estimates cut at Deutsche Bank by 32 cents to 91 cents a share as company is seeing deterioration in all segments. Maintained hold rating.