Analysts' Actions: AKAM, CIEN, ZNGA, FFIV

NEW YORK (TheStreet) -- CHANGE IN RATINGS

Akamai (AKAM) was upgraded at Canaccord Genuity to buy. $45 price target. Newer video applications should drive near-term growth, Canaccord said.

Allegheny Technologies (ATI) was downgraded at JP Morgan from overweight to neutral. $29 price target. Estimates also cut, given the oversupply in the stainless steel market, JP Morgan said.

Cubist Pharmaceuticals (CBST) was initiated with a sell rating at Cantor Fitzgerald. $37 price target. Cubicin growth will likely slow in 2013, Cantor said.

Cullen/Frost (CFR) was upgraded at Sterne Agee from underperform to neutral. Valuation call, based on a $54 price target, Sterne Agee said.

Ciena (CIEN) was upgraded at FBR Capital Markets from market perform to outperform. Company can gain market share in the coming quarters, FBR Capital Markets said.

Crocs (CROX) was downgraded at Sterne Agee from buy to neutral. Estimates were also cut, given the company's new guidance, Sterne Agee said.

F5 Networks (FFIV) was downgraded at Wunderlich from buy to hold. $100 price target. Company posted lower earnings and is leveraged to slower macro growth, Wunderlich said.

LSI (LSI) was downgraded at Wedbush from outperform to neutral. $7 price target. Company is seeing lower flash demand, Wedbush said.

NY Community Bancorp (NYB) was downgraded at Keefe, Bruyette & Woods from outperform to market perform. $13.50 price target. Net interest margin is declining and the company lacks near-term visibility, KBW said.

Prosperity Bancshares (PB) was upgraded at KBW from market perform to outperform. $48 price target. American State deal will add to earnings, KBW said.

Wyndham (WYN) was downgraded at Deutsche Bank from buy to hold. Valuation call, based on a $57 price target, Deutsche Bank said.

Zynga (ZNGA) was upgraded at Needham from hold to buy. Valuation call, based on a $4 price target, Needham said. Company has a solid cash cushion, Needham added.

STOCK COMMENTS / EPS CHANGES

Best Buy (BBY) numbers were cut at UBS. Shares are now seen reaching $18. Estimates were also lowered following preannouncement, UBS said. Neutral rating.

Cheesecake Factory (CAKE) numbers were reduced at Lazard. Shares are now seen reaching $39. Estimates were also cut, given lower expected store growth, Lazard said. Buy rating.

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