All three major indices are trading down today with the Dow Jones Industrial Average ( ^DJI) trading down 41 points (-0.2%) at 17,825 as of Monday, June 13, 2016, 12:55 PM ET. The NYSE advances/declines ratio sits at 1,142 issues advancing vs. 1,814 declining with 131 unchanged.

The Basic Materials sector currently sits up 0.2% versus the S&P 500, which is down 0.3%. On the negative front, top decliners within the sector include Marathon Petroleum ( MPC), down 5.0%, Valero Energy ( VLO), down 3.0%, Monsanto ( MON), down 1.0%, Phillips 66 ( PSX), down 1.0% and Total ( TOT), down 0.9%. Top gainers within the sector include Turquoise Hill Resources ( TRQ), up 14.1%, Teck Resources ( TCK), up 4.4%, Barrick Gold ( ABX), up 3.0%, Devon Energy ( DVN), up 2.6% and Potash Corp of Saskatchewan ( POT), up 2.6%.

TheStreet would like to highlight 3 stocks pushing the sector lower today:

3. Petroleo Brasileiro SA Petrobras ( PBR.A) is one of the companies pushing the Basic Materials sector lower today. As of noon trading, Petroleo Brasileiro SA Petrobras is down $0.11 (-2.2%) to $4.98 on average volume. Thus far, 6.8 million shares of Petroleo Brasileiro SA Petrobras exchanged hands as compared to its average daily volume of 12.1 million shares. The stock has ranged in price between $4.89-$5.08 after having opened the day at $4.93 as compared to the previous trading day's close of $5.09.

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Petroleo Brasileiro S.A. - Petrobras operates as an integrated energy company in Brazil and internationally. Petroleo Brasileiro SA Petrobras has a market cap of $34.9 billion and is part of the energy industry. Shares are up 49.7% year-to-date as of the close of trading on Friday.

TheStreet Ratings rates Petroleo Brasileiro SA Petrobras as a sell. The company's weaknesses can be seen in multiple areas, such as its deteriorating net income, generally high debt management risk, disappointing return on equity, weak operating cash flow and generally disappointing historical performance in the stock itself. Get the full Petroleo Brasileiro SA Petrobras Ratings Report now.

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2. As of noon trading, Williams Partners ( WPZ) is down $0.78 (-2.4%) to $32.35 on light volume. Thus far, 809,784 shares of Williams Partners exchanged hands as compared to its average daily volume of 2.4 million shares. The stock has ranged in price between $32.04-$32.95 after having opened the day at $32.49 as compared to the previous trading day's close of $33.13.

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Williams Partners L.P. operates as an energy infrastructure company. It operates through Central, Northeast G&P, Atlantic-Gulf, West, and NGL & Petchem Services segments. Williams Partners has a market cap of $20.7 billion and is part of the energy industry. Shares are up 19.0% year-to-date as of the close of trading on Friday. Currently there are 5 analysts that rate Williams Partners a buy, no analysts rate it a sell, and 4 rate it a hold.

TheStreet Ratings rates Williams Partners as a hold. The company's strengths can be seen in multiple areas, such as its expanding profit margins, good cash flow from operations and growth in earnings per share. However, as a counter to these strengths, we also find weaknesses including a generally disappointing performance in the stock itself, generally higher debt management risk and disappointing return on equity. Get the full Williams Partners Ratings Report now.

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1. As of noon trading, Royal Dutch Shell ( RDS.A) is down $0.35 (-0.7%) to $50.96 on average volume. Thus far, 2.1 million shares of Royal Dutch Shell exchanged hands as compared to its average daily volume of 4.6 million shares. The stock has ranged in price between $50.43-$51.42 after having opened the day at $50.45 as compared to the previous trading day's close of $51.31.

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Royal Dutch Shell plc operates as an independent oil and gas company worldwide. It operates through Upstream and Downstream segments. The company explores for and extracts crude oil, natural gas, and natural gas liquids. Royal Dutch Shell has a market cap of $209.8 billion and is part of the energy industry. Shares are up 12.1% year-to-date as of the close of trading on Friday.

TheStreet Ratings rates Royal Dutch Shell as a hold. Among the primary strengths of the company is its solid financial position based on a variety of debt and liquidity measures that we have evaluated. At the same time, however, we also find weaknesses including deteriorating net income, poor profit margins and weak operating cash flow. Get the full Royal Dutch Shell Ratings Report now.

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If you are interested in one of these 3 stocks, ETFs may be of interest. Investors who are bullish on the basic materials sector could consider Materials Select Sector SPDR ( XLB) while those bearish on the basic materials sector could consider ProShares Short Basic Materials Fd ( SBM).