CHANGE IN RATINGS

Aflac

(AFL) - Get Report

downgraded at Barclays from Equal-weight to Underweight. $20 price target. Valuation call, based on the company's book value.

BJ Services

( BJS) downgraded at Barclays from Overweight to Equal-weight. $13 price target. Pressure pumping market will likely remain weak through 2010.

Brocade

(BRCD)

upgraded at Goldman Sachs to Buy from Neutral. Expect higher Street estimates and multiple expansion as Cisco pushes into server market. Shares are still down 37% in 2009, leaving additional upside as a result of improved competitive position. Price target raised to $6.50 from $3.75.

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Caterpillar

(CAT) - Get Report

upgraded at JPMorgan from Neutral to Overweight. $40 price target. Company's liquidity position is improving, and 74% earnings recovery is possible next year.

Carnival

(CCL) - Get Report

downgraded at Wachovia. Rating lowered to Market Perform from Outperform. Maintains $25-$27 valuation range and 2009 EPS estimates of $2.20.

Clear Channel

(CCO) - Get Report

downgraded at Goldman Sachs to Sell from Neutral. View recent rally as overdone in light of deterioration in outdoor advertising and lack of visibility into turnaround. Also note likely covenant breach at parent company. Price target maintained at $2.50.

Comerica

(CMA) - Get Report

downgraded at Citigroup to hold from buy as Citi believes the near term risk/reward is relatively balanced at these levels. Price target increased to $24 from $18 largely due to lower equity risk premium. Bull case is strong capital base (and low risk of dilution) and normalized earnings power of $3.50,implying 'intrinsic value' of roughly $35 -- in line with many banks. However, CMA has large commercial portfolio which raises near term risks as entering into commercial end of the credit cycle given losses can be lumpy.

Quest Diagnostics

(DGX) - Get Report

downgraded at Jefferies. Rating lowered to Hold from Buy. Maintains price target of $59. Raises 2009 EPS estimates of $3.66 from $3.55.

Brinker

(EAT) - Get Report

upgraded at Goldman Sachs to Buy from Neutral based on changes in cost structure. Expect meaningful margin improvements over several quarters despite continued pressure on same store sales. Price target raised to $22 from $18.

Ford

(F) - Get Report

upgraded at Goldman Sachs to Buy from Neutral based on structural changes in auto industry and improved 2009 sales expectations. Note company's sufficient liquidity to make it through to 2010 without additional funding (unlike GM). Price target raised to $6 from $2.25.

FedEx

(FDX) - Get Report

upgraded at Merrill/BofA to neutral from underperform and price target increased to $56 from $48. Price target is slightly below its 16-year historical forward P/E average of 16.5x, and within its 13.0x-20.1x historical trading range. While ML's F2010 estimate is a slight decline from F2009, target multiple was increased to 16x from 13.5x due to reduced regulatory overhang.

General Dynamics

(GD) - Get Report

upgraded at Goldman Sachs to Buy from Neutral based on valuation and bottoming sentiment. View investor fears over Army/supplemental exposure as overdone and note management's capitulation on bizjets. Price target raised to $54 from $43.

Halliburton

(HAL) - Get Report

downgraded at Barclays from Overweight to Equal-weight. $22 price target. Valuation call, as rig activity should remain low into 2010.

Intrepid Potash

(IPI) - Get Report

downgraded at Goldman Sachs to Sell from Neutral based on overdone rally in potash stocks. Expect poor spring results as buyers protest record high prices. Believe retailers and farmers lack incentive to re-order potash at inflated prices, especially considering high inventory levels. Price target raised to $15 from $14.

Lockheed Martin

(LMT) - Get Report

downgraded at Goldman Sachs to Neutral from Buy. Shares are up 35% off March lows, making current levels attractive for profit taking. Also noted limited near-term catalysts. Price target raised to $80 from $73.

Prudential

(PRU) - Get Report

downgraded at Barclays from Equal-weight to Underweight. $27 price target. Valuation call, based on the company's book value.

Valspar

(VAL) - Get Report

upgraded at Goldman Sachs to Neutral from Sell based on improved near-term expectations for earnings. Consumer trends have improved in March and April, which bodes well for upcoming earngins announcement. Price target raised to $22 from $15.

STOCK COMMENTS / EPS CHANGES

Altera

(ALTR) - Get Report

estimates, target raised at Merrill/BofA to $20. Estimates also increased, because of higher sales in Asia. Buy rating.

Advanced Micro

(AMD) - Get Report

numbers raised at Barclays through 2010. Company seeing higher sales, and controlling operating expenses. Equal-weight rating and new $4 price target.

Blackrock

(BLK) - Get Report

numbers raised at Barclays through 2010. Company is realizing higher Solutions revenue and was helped by a lower tax rate last quarter. Overweight rating and new $134 price target.

Conagra

(CAG) - Get Report

target raised at Merrill/BofA to $20. Company has re-financed debt and is showing top-line growth in North America. Buy rating.

Cisco

(CSCO) - Get Report

estimates cut, target raised to $19 a share at Barclays Capital said. Estimates were lowered through 2010, as enterprise demand has not yet improved meaningfully. Equal-weight rating.

Delta Air Lines

(DAL) - Get Report

target raised at Merrill/BofA to $12. Company lost less than expected last quarter, as revenue trends have stabilized. Buy rating.

Merck

(MRK) - Get Report

estimates reduced at Barclays through 2010. Company facing higher foreign exchange costs and wholesalers are working down inventory. Overweight rating and $31 price target.

Union Pacific

(UNP) - Get Report

added to US 1 list at Merrill Lynch/Bank of America. Volumes declines appear to have stabilized, and management is aggressively cutting costs. Buy rating.

Western Union

(WU) - Get Report

numbers upped at Barclays to $20. Estimates also increased, as lower service costs boosted margins last quarter. Overweight rating.

This article was written by a staff member of TheStreet.com.