Stocks are recovering, but investors remain concerned about the next sell-off. 24/7 Wall St. reviews many analyst calls each morning, hunting for new ideas for our readers. Some analyst research reports cover stocks to buy, while some cover stocks to sell. These are this Wednesday’s top analyst upgrades, downgrades and initiations seen from Wall Street research firms.

Carbo Ceramics Inc. (NYSE: CRR) was raised to Buy and the price target was raised to $150 at Sterne Agee.

Carlyle Group L.P. (NASDAQ: CG) was raised to Buy from Neutral at UBS.

Facebook Inc. (NASDAQ: FB) was maintained as Buy and with an $80 target at Sterne Agee after the company spent $2 billion to acquire Oculus VR. Credit Suisse maintained a Neutral rating in its call.

Garmin Ltd. (NASDAQ: GRMN) was raised to Buy from Neutral at Citigroup.

Panera Bread Co. (NASDAQ: PNRA) was downgraded to Hold from Buy at Wunderlich based on lower margins.

Rubicon Technology Inc. (NASDAQ: RBCN) was reiterated as Buy with a $15 price target at Canaccord Genuity, based on an LED inflection point driving increased pricing.

Sirius XM Holdings Inc. (NASDAQ: SIRI) was raised to Overweight from Equal Weight at Barclays, although the $4 price target is 10% under the $4.44 consensus analyst price target.

Telefonica S.A. (NYSE: TEF) was downgraded to Underperform from Neutral at Bank of America Merrill Lynch.

Tesla Motors Inc. (NASDAQ: TSLA) was started as Neutral with a $230 price target at UBS, based on its valuation being reflected in its $220 share price.

It was another bad day for coal miners as far as daily research reports. UBS has downgraded the sector, following similar calls from other analysts in the past week. Those downgraded to Neutral from Buy were Alpha Natural Resources Inc. (NYSE: ANR), Arch Coal Inc. (NYSE: ACI), CONSOL Energy Inc. (NYSE: CNX), Peabody Energy Corp. (NYSE: BTU) and Walter Energy Inc. (NYSE: WLT).