Brazil’s Senate yesterday opened an official investigation of Petroleo Brasileiro Petrobras SA (ADR) (NYSE:PBR) 2006 acquisition of a U.S. refinery for which opposition senators say the company overpaid.The panel’s first action was to vote on a list of more than 70 people who will be called to testify; current CEO Maria das Graças Silva Foster and the CEO before Foster, José Sergio Gabrielli, are expected to testify next week. Petroleo Brasileiro Petrobras SA (ADR) (NYSE:PBR) stock performance was 88.50% in last session and finished the day at $16.47. Traded volume was 15.13 million shares in the last session and the average volume of the stock remained 1.86 million shares. The beta of the stock remained 1.58. Petroleo Brasileiro Petrobras SA (ADR) (NYSE:PBR) insider ownership is 679%.

AK Steel Holding Corporation (NYSE:AKS) said that the U.S. Department of Commerce has announced its preliminary determinations that imports of non-oriented electrical steel from China, Germany, Japan, South Korea, Sweden and Taiwan are being sold at less than fair value in the United States. As a result, the Commerce Department will instruct U.S. Customs and Border Protection to begin requiring U.S. importers of NOES from those six countries to deposit estimated antidumping duties at the time of importation. AK Steel Holding Corporation (NYSE:AKS) dropped -4.23% to $6.34 yesterday on volume of 7,541,300 shares. The intra-day range of the stock was $6.30 – 6.60. AK Steel Holding Corporation (NYSE:AKS) has a market capitalization of $866.75million.

Chesapeake Energy Corporation (NYSE:CHK) announced several asset sales agreements and a definitive plan to spin-off Chesapeake Oilfield Operating (Ba2, under review for downgrade; renamed Seventy Seven Energy) by the end of June 2014 that will reduce its adjusted debt by almost $2.5 billion. The transactions are also expected to raise cash proceeds of $915 million. Chesapeake Energy Corporation (NYSE:CHK)’s stock on May 20, 2014 reported a increase of 0.21% to the closing price of $28.02. Its fifty two weeks range is $19.32 – 30.48. The total market capitalization recorded $18.67 billion. The overall volume in the last trading session was 9,025,200 shares. In its share capital, Chesapeake Energy Corporation (NYSE:CHK) has 666.21 million outstanding shares.

Alpha Natural Resources, Inc (NYSE:ANR), the coal producer announced that it will now issue $400M in aggregate principal -amount of the senior secured 2nd lien notes that are due in 2020 in the private offering and is also subject to the market conditions. On Tuesday, shares of Alpha Natural Resources, Inc. (NYSE:ANR) dropped -6.41% to close the day at $3.94. Company return on investment (ROI) is -11.90% and its monthly performance is recorded as -8.80%. Alpha Natural Resources, Inc. (NYSE:ANR) quarterly revenue growth is -24.95%.