In trading on Monday, shares of the Guggenheim Spin-Off ETF ( CSD) entered into oversold territory, changing hands as low as $41.47 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 Guggenheim Spin-Off, the RSI reading has hit 27.4 — by comparison, the RSI reading for the S&P 500 is currently 33.7. A bullish investor could look at CSD's 27.4 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), CSD's low point in its 52 week range is $31.10 per share, with $46.99 as the 52 week high point — that compares with a last trade of $41.57. Guggenheim Spin-Off shares are currently trading down about 3.2% on the day.