24/7 Wall St.

After a roller-coaster week that finally pushed the markets into the green for the year, many investors are eyeing what could turn out to be a slow week as traders keep an eye on the exits for an early start to the Memorial Day weekend. With the futures looking down to start the week, profit taking comes into view.

24/7 Wall St. reviews dozens of analyst research reports each morning to find new investment and trading ideas for its readers. Some analyst research reports cover new stocks to buy and others cover stocks to sell or avoid.

These are Monday’s top analyst upgrades, downgrades and initiations.

A10 Networks Inc. (NASDAQ: ATEN) was raised from Sector Weight to Overweight at Pacific Crest.

BP PLC (NYSE: BP ) was downgraded to Sell from Neutral at Goldman Sachs.

Chevron Corp. (NYSE: CVX ) is another major oil downgraded from Neutral to Sell at Goldman Sachs.

Chesapeake Energy Corp. (NYSE: CHK) is downgraded from Buy to Neutral at Goldman Sachs.

GoPro Inc. (NASDAQ: GPRO) was raised to Perform from Underperform at Oppenheimer.

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Teekay Tankers Ltd. (NYSE: TNK) was started at Overweight at JPMorgan. Shares closed Friday at $6.54.

Penn National Gaming Inc. (NASDAQ: PENN) was raised to Buy from Neutral at Goldman Sachs. Shares closed Friday at $16.59.

Yelp Inc. (NASDAQ: YELP) is downgraded to Neutral from Overweight at Piper Jaffray.

Zayo Group Holdings Inc. (NYSE: ZAYO) was raised to Neutral from Underperform at Macquarie. The price target goes to $26 from $25.

In case you missed Friday’s top analyst upgrades, downgrades and initiations, they included Apple, Clovis Oncology, Deere, J.C. Penney, Wynn Resorts and Yum! Brands.