In trading on Tuesday, shares of the iShares U.S. Basic Materials ETF ( IYM) crossed above their 200 day moving average of $84.62, changing hands as high as $84.78 per share. iShares U.S. Basic Materials shares are currently trading up about 0.4% on the day. The chart below shows the one year performance of IYM shares, versus its 200 day moving average:Looking at the chart above, IYM's low point in its 52 week range is $75.32 per share, with $89.46 as the 52 week high point — that compares with a last trade of $84.63.