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Stock Analysts’ downgrades for Thursday, August 21st:

Arcos Dorados Holding (NASDAQ:ARCO) was downgraded by analysts at Citigroup Inc. from a neutral rating to a sell rating.

Avago Technologies (NASDAQ:AVGO) was downgraded by analysts at Zacks from an outperform rating to a neutral rating. Zacks currently has $79.00 price target on the stock. Zacks’ analyst wrote, “Avago reported strong second-quarter fiscal 2014 results with adjusted earnings well exceeding the Zacks Consensus Estimate. Avago is one of the leading players in the analog semiconductor market with a wide array of products and a well-diversified customer base. Avago further expects to strengthen its position through organic growth across the industry verticals and increased market penetration buoyed by the LSI acquisition. In addition to cost synergies from a combined resource pool, the acquisition is likely to improve the operating margin and create greater scale to further drive innovation. However, operating risks regarding high R&D costs for technology-driven products could weigh on the margins moving forward. We are changing our long-term recommendation on Avago from Outperform to Neutral as we anticipate the stock to perform in line with the broader market. “

Avianca Holdings SA (NYSE:AVH) was downgraded by analysts at Zacks from a neutral rating to an underperform rating. Zacks currently has $15.30 price target on the stock.

Braskem SA (NYSE:BAK) was downgraded by analysts at Zacks from a neutral rating to an underperform rating. The firm currently has $12.80 target price on the stock.

Dynamic Materials (NASDAQ:BOOM) was downgraded by analysts at Zacks from a neutral rating to an underperform rating. Zacks currently has $18.40 target price on the stock.

Copa Holdings, (NYSE:CPA) was downgraded by analysts at Zacks from a neutral rating to an underperform rating. The firm currently has $126.20 price target on the stock.

Helix Energy Solutions Group (NYSE:HLX) was downgraded by analysts at Zacks from an outperform rating to a neutral rating. Zacks currently has $30.10 price target on the stock.

Hornbeck Offshore Services (NYSE:HOS) was downgraded by analysts at Capital One Financial Corp. from an overweight rating to an equal weight rating.

Mobile TeleSystems OJSC (NYSE:MBT) was downgraded by analysts at Goldman Sachs from a buy rating to a neutral rating.

Rex American Resources Corp. (NYSE:REX) was downgraded by analysts at Sidoti from a buy rating to a neutral rating.

Real Goods Solar (NASDAQ:RGSE) was downgraded by analysts at Sidoti from a buy rating to a neutral rating.

ReneSola (NYSE:SOL) was downgraded by analysts at Zacks from an outperform rating to a neutral rating. The firm currently has $3.00 price target on the stock. Zacks’ analyst wrote, “We are downgrading our recommendation on ReneSola Ltd. to Neutral from Outperform, primarily due to harsh solar trade tariffs, volatile raw material prices and foreign currency risk. Punishing tariffs imposed by the U.S. and other countries on Chinese solar products will likely negatively impact the performance of ReneSola. However, we are impressed by the company’s efforts to expand into Europe, Asia, Africa and the Middle East while retaining its foothold in the U.S. These initiatives will help ReneSola get more contracts and boost its future cash inflow. In second-quarter 2014, the company’s earnings reversed the loss incurred in the prior year quarter and easily surpassed the Zacks Consensus Estimate of a loss. A decrease in operating expenses primarily led to the favorable quarterly performance.”

Tidewater (NYSE:TDW) was downgraded by analysts at Capital One Financial Corp. from an overweight rating to an equal weight rating.

Telecom Argentina S.A. (NYSE:TEO) was downgraded by analysts at TheStreet to a hold rating.

Yandex NV (NASDAQ:YNDX) was downgraded by analysts at Goldman Sachs from a buy rating to a neutral rating.

YPF Sociedad Anonima (NYSE:YPF) was downgraded by analysts at Zacks from an outperform rating to a neutral rating. Zacks currently has $40.90 price target on the stock.

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