Stocks were up on Thursday on the heels of European Central Bank actions. Investors remain optimistic with the U.S. markets close to all-time highs, and they are looking for value and individual overlooked stocks. 24/7 Wall St. reviews dozens of research reports each morning, on the hunt for new trading and investing ideas for our readers. Some of these analyst research reports cover stocks to buy, while others cover stocks to sell or stocks to avoid.

These are this Thursday’s top analyst upgrades and downgrades covered by 24/7 Wall St.

Analog Devices Inc. (NASDAQ: ADI) was reiterated as Buy with a $65 price target (versus a $50.25 close and a $57.08 consensus price target) at Argus, based on the weakness after the company’s first quarterly earnings report with Hittite attached, now that it was acquired.

Google Inc. (NASDAQ: GOOGL) was reiterated as Outperform with a $745 price target (versus a $589.52 close) at Credit Suisse, with the firm signaling that it sees upside to its earnings estimates based on Google Play.

GoPro Inc. (NASDAQ: GPRO) was downgraded to Neutral from Overweight by J.P. Morgan. Keep in mind that its stock has now doubled from its post-IPO low. GoPro shares were down by 5% at $56.86 in early bird trading indications.

Infinity Pharmaceuticals Inc. (NASDAQ: INFI) was a stock we just gave a 360-degree review after it jumped 50% on Wednesday. Now we have the stock being raised to Market Outperform with a high $24 price target at JMP Securities.

3D Systems Corp. (NYSE: DDD) was downgraded to Sector Perform from Outperform at Pacific Crest, based on the concern that the 3D printing leader is stretching itself too thin in too many areas. Canaccord said a recent deal is expanding its metal printing footprint.

Annie’s Inc. (NYSE: BNNY) was started as Outperform and a $42 price target at Oppenheimer.

Boulder Brands Inc. (NASDAQ: BDBD) was started as Outperform with a $16 price target at Oppenheimer.

British American Tobacco PLC (NYSE: BTI) was downgraded to Neutral from Outperform at BNP Paribas.

China Unicom Ltd. (NYSE: CHU) was called the best placed of the Chinese telecoms by Credit Suisse.

D.R. Horton Inc. (NYSE: DHI) was raised to Buy from Neutral at UBS.

Foot Locker Inc. (NYSE: FL) was started as Buy at Jefferies. Note that Foot Locker shares hit an all-time high of $57.90 just on Wednesday.

ALSO READ: Credit Suisse Positive on Some Biotechs, Very Cautious in Others!

IAC/InterActiveCorp (NASDAQ: IACI) was raised to Overweight from Equal Weight at Barclays.

International Paper Co. (NYSE: IP) was started as Market Perform with a $51 price target (versus a $49.06 close) at BMO Capital Markets.

Ironwood Pharmaceuticals Inc. (NASDAQ: IRWD) was downgraded to Market Perform from outperform at Cowen.

Las Vegas Sands Corp. (NYSE: LVS) was downgraded to Hold from Buy at Argus, based on a weaker Macau outlook.

LifeLock Inc. (NYSE: LOCK) was reiterated as Buy but the price target was raised to $20 from $18 (versus a $15.40 close) at Sterne Agee. The call is on the heels of management meetings and also on the growing concern of data breaches.

Norwegian Cruise Line Holdings Ltd. (NASDAQ: NCLH) was downgraded to Neutral from Buy at Goldman Sachs after the stock rallied on news that it was spending $3 billion to buy Prestige Cruises so that it will own the Regent and Oceania cruise line brands.

Teradata Corp. (NYSE: TDC) was downgraded to Equal Weight from Overweight at Barclays.

ALSO READ: The Two Analysts Worried About Apple and iPhone 6 Launch

Weyerhaeuser Co. (NYSE: WY) was started as Outperform at BMO Capital Markets.

WhiteWave Foods Co. (NYSE: WWAV) was started as Outperform with a $43 price target at Oppenheimer.

In case you missed Wednesday’s top analyst upgrades and downgrades, they included shares of ABB, Bank of America, J.P. Morgan, SanDisk, Micron Technologies, Mylan and many more.

You can also take our poll: How high can the S&P 500 rise before the next real bear market kicks in?

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