In trading on Tuesday, shares of the iShares Morningstar Small-Cap Growth ETF ( JKK) entered into oversold territory, changing hands as low as $132.9782 per share. We define oversold territory using the Relative Strength Index, or RSI, which is a technical analysis indicator used to measure momentum on a scale of zero to 100. A stock is considered to be oversold if the RSI reading falls below 30.In the case of iShares Morningstar Small-Cap Growth, the RSI reading has hit 26.8 — by comparison, the RSI reading for the S&P 500 is currently 38.7. A bullish investor could look at JKK's 26.8 reading as a sign that the recent heavy selling is in the process of exhausting itself, and begin to look for entry point opportunities on the buy side. Looking at a chart of one year performance (below), JKK's low point in its 52 week range is $106.49 per share, with $146.19 as the 52 week high point — that compares with a last trade of $133.36. iShares Morningstar Small-Cap Growth shares are currently trading down about 1.4% on the day.