NEW YORK (TheStreet) -- The stock indexes finished the trading week on an up note.

The S&P 500 gained 1.70% on the week to close at 2102.06 while the DJIA was higher by 1.66% on the week to close at 18,057.65. The Nasdaq gained 2.23% for the week to finish at 4,995.97 wile the Russell 2000 closed higher by 0.73% to finish at 1,264.77.

Yet, the S&P 500 Trust Series ETF(SPY) - Get Report volume set a new low volume day for 2015, coming in at just over 70 million shares traded. This is a negative divergent indicator as the indexes move higher. Volume matters when indexes move higher on light trading days.

Going into next week, the stock indexes could become overbought on a daily basis if they continue to move higher. Traders should continue to stay cautious and opportunistic. The best way to buy stocks is when they have oversold signals on a daily basis. Risk decreases for traders when they stick with oversold signals and don't allow emotion to enter into the trade.

As we predicted on Wednesday, CME Group(CME) - Get Report and Urban Outfitters(URBN) - Get Report were ripe for buying. Both ended higher on the week. The Direxion Daily Russia Bear 3x(RUSS) - Get Report was oversold and closed higher by 11% on Friday.

Currently, only ServiceMaster Global Holdings(SERV) - Get Report is the only large cap stock with an oversold signal. Below is a chart showing the uptrend on a daily basis along with the oversold signal. It should move higher over the next few trading days.

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This article is commentary by an independent contributor. At the time of publication, the author held RUSS.