The Basic Materials sector (XLB) showed little change during trading today while the S&P 500 rose 0.3%.

The ETF, as a proxy for the sector, tracked farther from the overall market today than over the past month. Entering today's trading, XLB was up 6.1% over the last thirty trading days while the S&P 500 climbed 6.5%.

Omega Flex (OFLX) was one of the sector's big losers, as its price dropped 7.6% (-91 cents) to close at $11. 31,585 shares of the stock moved. The stock traded between $10.91 and $12.10. The stock has fallen over the last three months, dropping $1.61 (-12.8%) from $12.61 on April 4, 2012.

Valhi (VHI) was a major gainer in the sector, rising 7% (+88 cents) to close at $13.37 with 36,688 shares moving. The stock traded in a range of $12.53 to $13.37.

AptarGroup (ATR) rose 1.4% to close at $51.78, cross its 50-day moving average of $51.58 and 200-day moving average of $52.29. Polypore International (PPO) declined 3.2% to close at $39.11, moving below its 50-day moving average of $37.25 and 200-day moving average of $40.67.

Greif (GEF.B) rose 2.5% to close at $46.10, approaching its 50-day moving average of $46.24. It has also moved closer to its 200-day moving average of $49.47. Syngenta (ADES) fell 1.9% to close at $67.14, moving closer to its 50-day moving average of $65.27. Also, the stock moved closer to its 200-day moving average of $23.75.

American Vanguard (AVD) hit a new 52-week high today, reaching $27.83 to top the previous high of $27.25.