All three major indices are trading down today with the Dow Jones Industrial Average ( ^DJI) trading down 41 points (-0.3%) at 15,444 as of Tuesday, July 16, 2013, 12:45 PM ET. The NYSE advances/declines ratio sits at 951 issues advancing vs. 1,969 declining with 95 unchanged. The Basic Materials sector currently sits down 0.2% versus the S&P 500, which is down 0.4%. On the negative front, top decliners within the sector include Axiall ( AXLL), down 22.0%, Marathon Petroleum ( MPC), down 4.4%, El Paso Pipeline Partners ( EPB), down 3.0%, Phillips 66 ( PSX), down 2.7% and Energy Transfer Partners L.P ( ETP), down 2.1%. Top gainers within the sector include Barrick Gold Corporation ( ABX), up 6.6%, Kinross Gold Corporation ( KGC), up 5.8%, Yamana Gold ( AUY), up 5.4%, Randgold Resources ( GOLD), up 5.5% and Ecopetrol S.A ( EC), up 1.9%. TheStreet would like to highlight 5 stocks pushing the sector lower today: 5. Mosaic ( MOS) is one of the companies pushing the Basic Materials sector lower today. As of noon trading, Mosaic is down $1.74 (-3.1%) to $54.39 on heavy volume. Thus far, 3.9 million shares of Mosaic exchanged hands as compared to its average daily volume of 2.8 million shares. The stock has ranged in price between $53.91-$56.14 after having opened the day at $56.03 as compared to the previous trading day's close of $56.13. The Mosaic Company produces and markets concentrated phosphate and potash crop nutrients for the agriculture industry worldwide. Mosaic has a market cap of $16.7 billion and is part of the chemicals industry. Shares are down 0.9% year to date as of the close of trading on Monday. Currently there are 13 analysts that rate Mosaic a buy, no analysts rate it a sell, and 4 rate it a hold. TheStreet Ratings rates Mosaic as a buy. The company's strengths can be seen in multiple areas, such as its revenue growth, largely solid financial position with reasonable debt levels by most measures, increase in stock price during the past year and increase in net income. We feel these strengths outweigh the fact that the company has had somewhat disappointing return on equity. Get the full Mosaic Ratings Report now. STOCKS TO BUY: TheStreet Quant Ratings has identified a handful of stocks that can potentially TRIPLE in the next 12-months. Learn more.