NEW YORK (TheStreet) --All three major U.S. averages closed in the green on Monday as positive sentiment around earnings and M&A marked the trading session.

"We've had a pretty narrow trading range for the Dow and the S&P 500. We have been higher for the first time in several sessions. Volatility remains low, as does volume," CNBC's Courtney Reagan reported.

Regarding earnings season, 24% of the S&P 500 has already reported, with 78% topping analysts' expectations. Revenues have not been as strong, but have still been solid, she noted during this afternoon "Closing Bell."

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"Today is a little bit risk-on, we have the technology names that have been really moving us higher, some consumer discretionary as well. Telecom moving lower, of course, we saw that movement from AT&T (T) - Get Report on the back of that deal which has been a really big talking point," Reagan added.

Additionally, other notable themes from today's session are that oil seems to be finding resistance at the $50 level, and several financials closed higher, she noted.

Tomorrow will bring a significant day for earnings season as Caterpillar (CAT), P&G (PG), Whirlpool (WHR), United Technologies (UTX), Under Armour (UA), and Apple (AAPL) are all among those who will report results.

(AT&T is a holding in David Peltier's Dividend Stock Advisor.)