Two out of the three major indices are trading up today with the Dow Jones Industrial Average ( ^DJI) trading up 71 points (0.4%) at 17,316 as of Monday, Nov. 16, 2015, 11:55 AM ET. The NYSE advances/declines ratio sits at 1,543 issues advancing vs. 1,341 declining with 209 unchanged.

The Basic Materials sector currently sits down 0.2% versus the S&P 500, which is up 0.2%. On the negative front, top decliners within the sector include Vale ( VALE), down 1.3%, and Southern Copper ( SCCO), down 1.1%. Top gainers within the sector include Energy Transfer Equity ( ETE), up 6.0%, Cheniere Energy ( LNG), up 5.0%, Williams Companies ( WMB), up 4.6%, Petroleo Brasileiro SA Petrobras ( PBR.A), up 4.3% and Airgas ( ARG), up 4.1%.

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

3. PetroChina ( PTR) is one of the companies pushing the Basic Materials sector lower today. As of noon trading, PetroChina is down $0.80 (-1.1%) to $70.73 on light volume. Thus far, 51,548 shares of PetroChina exchanged hands as compared to its average daily volume of 176,400 shares. The stock has ranged in price between $70.57-$71.68 after having opened the day at $71.12 as compared to the previous trading day's close of $71.53.

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PetroChina Company Limited, together with its subsidiaries, produces and sells oil and gas in the People's Republic of China. The company operates through Exploration and Production, Refining and Chemicals, Marketing, and Natural Gas and Pipeline segments. PetroChina has a market cap of $135.0 billion and is part of the energy industry. Shares are down 35.5% year-to-date as of the close of trading on Friday. Currently there are 2 analysts that rate PetroChina a buy, no analysts rate it a sell, and 1 rates it a hold.

TheStreet Ratings rates PetroChina as a hold. Among the primary strengths of the company is its reasonable valuation levels, considering its current price compared to earnings, book value and other measures. At the same time, however, we also find weaknesses including feeble growth in the company's earnings per share, disappointing return on equity and weak operating cash flow. Get the full PetroChina Ratings Report now.

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2. As of noon trading, POSCO ( PKX) is down $0.67 (-1.8%) to $35.65 on average volume. Thus far, 184,595 shares of POSCO exchanged hands as compared to its average daily volume of 490,900 shares. The stock has ranged in price between $35.42-$35.81 after having opened the day at $35.57 as compared to the previous trading day's close of $36.32.

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POSCO manufactures and sells steel rolled products and plates in South Korea. Its Steel segment offers cold rolled and hot rolled products, plates, wire rods, silicon steel sheets, and stainless steel products; and pig iron, billets, blooms, and slabs. POSCO has a market cap of $11.6 billion and is part of the metals & mining industry. Shares are down 43.1% year-to-date as of the close of trading on Friday. Currently there are no analysts that rate POSCO a buy, no analysts rate it a sell, and none rate it a hold.

TheStreet Ratings rates POSCO as a hold. The company's strengths can be seen in multiple areas, such as its increase in net income and attractive valuation levels. However, as a counter to these strengths, we also find weaknesses including poor profit margins, disappointing return on equity and a generally disappointing performance in the stock itself. Get the full POSCO Ratings Report now.

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1. As of noon trading, Marathon Petroleum ( MPC) is down $0.40 (-0.7%) to $52.96 on light volume. Thus far, 1.0 million shares of Marathon Petroleum exchanged hands as compared to its average daily volume of 5.1 million shares. The stock has ranged in price between $52.60-$53.92 after having opened the day at $53.41 as compared to the previous trading day's close of $53.36.

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Marathon Petroleum Corporation, together with its subsidiaries, engages in refining, marketing, retailing, and transporting petroleum products primarily in the United States. It operates through three segments: Refining & Marketing, Speedway, and Pipeline Transportation. Marathon Petroleum has a market cap of $29.2 billion and is part of the energy industry. Shares are up 18.9% year-to-date as of the close of trading on Friday. Currently there are 9 analysts that rate Marathon Petroleum a buy, 1 analyst rates it a sell, and 2 rate it a hold.

TheStreet Ratings rates Marathon Petroleum as a buy. The company's strengths can be seen in multiple areas, such as its solid stock price performance, impressive record of earnings per share growth, compelling growth in net income, notable return on equity and attractive valuation levels. We feel its strengths outweigh the fact that the company has had generally high debt management risk by most measures that we evaluated. Get the full Marathon Petroleum 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).