Not buying into the rally just yet: Experts

U.S. stocks posted their biggest weekly gain of the year Friday, as the Nasdaq composite rose modestly and the S&P 500 ended down slightly.

Greater market stabilization, however, remains to be seen as the rally could be short-lived, said Jonathan Corpina, senior managing partner at Meridian Equity Partners, on Friday.

A major factor that could have contributed to market volatility this week was its shortness due to the Presidents Day holiday on Monday, he noted.

"A lot of trading activity [was] combined into just four days. We've had a lot of volatility in this market both on the downside and on the upside, and volume hasn't really supported any of that," Corpina said on CNBC's "Closing Bell." "We're starting to build a little bit of a base here. We need to see if that can continue over time."

Corpina foresees the performance of the markets on Monday as a better indicator of how equities are really doing given that there is not a lot of economic data or earnings scheduled for that particular day.

Though the outlook for the start to next week may appear calm for now, Nancy Tengler, Heartland Financial's chief investment officer, said on Friday that investors should capitalize on the buying opportunities that will be presented in the near future.

"As a fundamental investor, I see a lot of valuation coming our way, a lot of companies that historically may not have been within our reach because they were more growth oriented and had higher valuations levels," Tengler said Friday on "Closing Bell."

Tengler noted that she uses the DeMark Indicators for market timing to determine that there are a number of "buys" that are expected to appear in the market.

"The S&P is setting up for a buy, and the Nasdaq is clearly in buy territory, which confirms what I am seeing at the valuation level," said Tengler. "There is plenty of cash on the sidelines which creates an opportunity and demand for stocks as we move forward."