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Top Analyst Upgrades and Downgrades (AKS, ATML, AVP, CTXS, DRI, EQM, HK, LAMR, ORCL, BTU, SBH, SQNM, JOE, X, VLO, VECO, VPHM, FB, GS, MS)

Source: Jon Ogg
These are some of the top analyst upgrades, downgrades and initiations seen from Wall St. research calls this Monday.

AK Steel Holding Corp. (NYSE: AKS) cut to Sell at Citigroup.

Atmel Corp. (NASDAQ: ATML) cut to Neutral at UBS.

Avon Products Inc. (NYSE: AVP) named Bear of the Day at Zacks.

Citrix Systems Inc. (NASDAQ: CTXS) cut to Equal Weight at Morgan Stanley.

Darden Restaurants Inc. (NYSE: DRI) cut to Neutral at JPMorgan.

EQT Midstream Partners L.P. (NYSE: EQM) cut to Neutral at Credit Suisse.

Halcon Resources Corp. (NYSE: HK) started as Overweight at Barclays.

Lamar Advertising Co. (NASDAQ: LAMR) raised to Overweight at Morgan Stanley and raised to Outperform at Wells Fargo.

Oracle Corp. (NASDAQ: ORCL) reiterated Buy with $39 target at Argus.

Peabody Energy Corp. (NYSE: BTU) cut to Underperform at BofA/ML.

Sally Beauty Holdings Inc. (NYSE: SBH) started as Outperform at Credit Suisse.

Sequenom Inc. (NASDAQ: SQNM) cut to Neutral at Piper Jaffray.

The St. Joe Company (NYSE: JOE) named Bull of the Day at Zacks.

United States Steel Corp. (NYSE: X) cut to Neutral at Citigroup.

Valero Energy Corp. (NYSE: VLO) cut to Hold at Argus.

Veeco Instruments Inc. (NASDAQ: VECO) cut to Sell at Goldman Sachs.

ViroPharma Inc. (NASDAQ: VPHM) raised to Outperform at Wells Fargo.

Facebook Inc. (NASDAQ: FB) could be worth as little as $15 per share, according to the cover story over the weekend by Barron’s.

Goldman Sachs Group Inc. (NYSE: GS) and Morgan Stanley (NYSE: MS) both saw their estimates raised for 2012 by Credit Suisse this morning. Goldman’s change was based on better September trading and asset prices; Morgan Stanley was called not a great environment, but it is looking for a post-Moody’s bounce.

JON C. OGG