Analysts' Actions: AIG, BFB, IBM, HOLX

NEW YORK ( TheStreet) -- CHANGE IN RATINGS

Assured Guaranty ( AGO) was downgraded at UBS to Neutral from Buy. $18 price target. Limited upside if Moody's downgrades, UBS said.

American International ( AIG) was upgraded at Bernstein to Outperform. $45 price target. Company can continue to execute its final asset sales and soon be out from under the government's wings, Bernstein said.

Brown-Forman ( BFB) was upgraded at UBS to Buy from Neutral. $98 price target. Multiple growth drivers behind revenue acceleration, UBS said.

Biogen Idec ( BIIB) was upgraded at Goldman Sachs to Buy. $150 price target. Late-stage clinical pipeline remains attractive, Goldman said.

Colony Financial ( CLNY) was downgraded to Hold at TheStreet Ratings.

Cubist ( CBST) was initiated with a Hold rating at Brean Murray. Company lacks near-term catalysts, Brean Murray said.

Celgene ( CELG) was initiated with a Buy rating at Cantor Fitzgerald. $90 price target. Company has multiple potential catalysts and can also deliver solid earnings growth over the next five years, Cantor said.

Ciena ( CIEN) was upgraded at JP Morgan from Neutral to Overweight. $20 price target. Company is leveraged to the optical upgrade cycle, JP Morgan said.

Gap ( GPS) was upgraded at Piper Jaffray to Overweight from Neutral. $34 price target. Company will benefit disproportionately from an emerging multiyear apparel cycle, Piper Jaffray said.

Hologic ( HOLX) was initiated with a Buy rating at Bank of America/Merrill Lynch. $26 price target. New products can drive consistent, double-digit annual earnings growth, BofA/Merrill said.

IBM ( IBM) was downgraded from Buy to Neutral at Bank of America/Merrill Lynch. Valuation call, based on a $215 price target, BofA/Merrill said.

Joy Global ( JOY) was upgraded at Keybanc from Hold to Buy. Valuation call, based on a $90 price target, Keybanc said.

Park-Ohio Holdings ( PKOH) was upgraded to Buy at TheStreet Ratings.

Progressive ( PGR) was downgraded to Neutral from Buy at Bank of America/Merrill Lynch. $25 price target. Valuation call, BofA/Merrill said.

Polaris ( PII) was downgraded at Wells Fargo from Outperform to Market Perform. Valuation call, Wells Fargo said.

Spirit Airlines ( SAVE) was initiated with a Buy rating at Citigroup. $30 price target. Growth driven by increases in capacity and ancillary revenue, Citigroup said.

Starbucks ( SBUX) was upgraded at Goldman Sachs from Neutral to Buy. Company was also placed on the Conviction List, as it appears to be entering a renewed growth phase, Goldman said.

TIBCO Software ( TIBX) was initiated with a Market Perform rating at Wells Fargo. $33 - $35 valuation range. Stock deservedly reflects sustainable strategic market position, Wells Fargo said.

Tellabs ( TLAB) was upgraded from Overweight to Neutral at JP Morgan. Consensus expectations remain too conservative, JP Morgan said.

Under Armour ( UA) was downgraded at Stifel Nicolaus from Buy to Hold. Valuation call, Stifel said.

Stock Comments / EPS Changes

American International numbers raised at Credit Suisse. Shares are now seen reaching $31. Estimates were also increased, as visibility is improving. Neutral rating.

Best Buy ( BBY) estimates were cut at Morgan Stanley through 2013. Lower sales are cutting into margins, Morgan Stanley said. Equal-weight rating.

Blackstone ( BX) was added to the Top Picks Live list at Citigroup. $19 price target. Rising alternative allocations and strong strategic positioning, Citigroup said.

Cubist Pharmaceuticals ( CBST) target was raised at Oppenheimer. Shares are now seen reaching $49. Expect upward guidance revisions in 2012, Oppenheimer said. Outperform rating.

CME Group ( CME) target was raised at Jefferies. Shares are now seen reaching $325. Long-term trends are still favorable, Jefferies said. Buy rating.

Dick's Sporting Goods ( DKS) was added to Top Picks Live at Citigroup. $57 price target. Better-than-expected SSS will be stock catalyst, Citi said.

Express Scripts ( ESRX) target was raised at Jefferies. Shares are now seen reaching $68. Shares have room to run, Jefferies said. Buy rating.

Home Depot ( HD) numbers were boosted at Bank of America/Merrill Lynch. Shares are now seen reaching $60. Higher sales are driving margin expansion, and the company is buying back more stock, BofA/Merrill said.

Intercontinental Exchange ( ICE) numbers were raised at Jefferies. Shares are now seen reaching $160. Estimates were also raised on record OTC energy activity, Jefferies said. Buy rating.

Lowe's ( LOW) estimates, price target were raised at Bank of America/Merrill Lynch. Estimates were boosted through 2014. Company will likely repurchase more stock, BofA/Merrill said. New $34 price target.

McDonald's ( MCD) was cut from the Conviction Buy List at Goldman Sachs. Industry trends appear to have slowed in March, Goldman said.

Parametric Technology ( PMTC) price target was raised at Jefferies to $33. Earnings power potential maintains shares at a Buy, Jefferies said. Buy rating.

SanDisk ( SNDK) numbers were lowered at UBS. Shares are now seen reaching $57, according to UBS. Estimates were also lowered as the first quarter was worse than expected, UBS said. Buy rating.

SanDisk estimates, target were reduced at JMP Securities. Shares are now seen reaching $61. Estimates were also cut, given the company's new guidance, JMP said. Outperform rating.

Tiffany & Co ( TIF) numbers were raised at Oppenheimer. Shares are now seen reaching $83. Estimates were also raised on second half 2012 recovery, Oppenheimer said. Outperform rating.

WisdomTree ( WETF) numbers were increased at Piper Jaffray through 2013. Company is attracting more assets, Piper Jaffray said. Overweight rating and new $9.50 price target.

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