These are some of the top analyst upgrades, downgrades and initiations seen in Wall Street research calls this Thursday.

Analog Devices Inc. (NYSE: ADI) Reiterated Buy with $43 target at Argus.

ARM Holdings PLC (NASDAQ: ARMH) Raised to Buy at S&P.

Assured Guaranty (NYSE: AGO) Raised to Buy at UBS.

Baker Hughes Inc. (NYSE: BHI) Cut to Hold at Societe Generale.

Dean Foods Co. (NYSE: DF) named as Bull of the Day in its turnaround at Zacks.

Dell Inc. (NASDAQ: DELL) Maintained Buy but target cut to $18 from $22 at Argus.

Duke Energy Corporation (NYSE: DUK) Raised to Buy at UBS.

Eaton Vance (NYSE: EV) Raised to Neutral from Sell at Citigroup.

Express Inc. (NYSE: EXPR) Started as Neutral at JPMorgan.

Hewlett-Packard Co. (NYSE: HPQ) Maintained Neutral but raised 2012/2013 estimates by 2% at Credit Suisse.

Human Genome Sciences Inc. (NASDAQ: HGSI) Cut to Market Perform with a price target of $13.00 at BMO Capital.

Iridium Communications Inc. (NASDAQ: IRDM) Started as Buy at CRT Capital.

MetLife Inc. (NYSE: MET) Reiterated Buy with $46 target at Argus.

National Oilwell Varco (NYSE: NOV) Raised to Buy at Societe Generale.

OCZ Technology Group Inc (NYSE: OCZ) Started as Outperform with $8 target at Credit Suisse.

RadioShack Corporation (NYSE: RSH) named as Bear of the Day at Zacks.

RailAmerica Inc. (NYSE: RA) Cut to Neutral at JPMorgan.

Three calls seen on NetApp (see here).

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