Stocks were getting pounded on Tuesday after weak overseas data. Still, the main theme that has remained for well over two years now is that investors have become trained to buy stocks whenever there is a pullback.

24/7 Wall St. reviews dozens of analyst reports each morning of the week on the hunt for new investment and trading ideas for its readers. Some of these analyst research reports cover stocks to buy, and some cover stocks to sell or to avoid. These are this Tuesday’s top analyst upgrades and downgrades.

AcelRx Pharmaceuticals Inc. (NASDAQ: ACRX) was downgraded to Hold from Buy and the price target was slashed to $6 from $12 (versus a $5.51 close) at Jefferies after Monday’s drop of well over 30%.

AECOM (NYSE: ACM) was started as Outperform with a $35 price target (versus a $29.02 close) at Credit Suisse.

Antero Resources Corp. (NYSE: AR) was started as Outperform with a $53 price target (versus a $36.05 close) at Credit Suisse.

ARRIS Group Inc. (NASDAQ: ARRS) was raised to Overweight from Equal Weight and the price target was raised to $36 from $30 (versus a $28.70 close) at Barclays.

Bonanza Creek Energy Inc. (NYSE: BCEI) was started as Outperform with a $35 price target (versus a $26.10 close) at Credit Suisse.

Electronic Arts Inc. (NASDAQ: EA) was downgraded to Hold from Buy at Needham.

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Hewlett-Packard Co. (NYSE: HPQ) was raised to Buy from Neutral with a $40 price target (versus a $32.95 close) at UBS.

HSBC Holdings PLC (NYSE: HBC) was raised to Buy from Neutral at Goldman Sachs.

Hologic Inc. (NASDAQ: HOLX) was started as Buy with a $38 price target (versus a $31.79 close) at UBS.

Illumina Inc. (NASDAQ: ILMN) was started as Buy with a $240 price target (versus a $193.07 close) at UBS.

Ixia (NASDAQ: XXIA) was raised to Buy from Hold at Wunderlich.

Melco Crown Entertainment Ltd. (NASDAQ: MPEL) was downgraded to Sell from Buy at Deutsche Bank.

Myriad Genetics Inc. (NASDAQ: MYGN) was started as Sell at UBS.

NVIDIA Corp. (NASDAQ: NVDA) was raised to Buy from Neutral and the price objective was raised to $28 from $24 (versus a $22.61 close) at Bank of America Merrill Lynch.

Orbital ATK Inc. (NYSE: OA) was raised to Overweight from Equal Weight with a $100 price target (versus a $69.26 close) at Barclays.

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PerkinElmer Inc. (NYSE: PKI) was started as Buy with a $53 price target (versus a $46.45 close) at UBS.

Springleaf Holdings LLC (NYSE: LEAF) was raised to Buy from Neutral with a $62 price objective (versus a $46.99 close) at Merrill Lynch.

Thermo Fisher Scientific Inc. (NYSE: TMO) was started as Buy at UBS.

Urban Outfitters Inc. (NASDAQ: URBN) was raised to Buy from Neutral at Janney Capital Markets. William Blair also raised its rating to Outperform from Market Perform. Sterne Agee maintained a Neutral but raised estimates.

XO Group Inc. (NYSE: XOXO) was raised to Buy from Hold with a $20 target price (versus a $15.43 close) at Stifel.

In case you missed Monday’s top analyst upgrades and downgrades, they included Amazon.com, BlackBerry, F5 Networks, J.P. Morgan, Juniper Networks, United Continental and over a dozen more companies.

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