By Anora Mahmudova and Barbara Kollmeyer, MarketWatch

UBS strategists: Now isn't the time to bail out of stocks

NEW YORK (MarketWatch) -- U.S. stocks opened higher on Monday following the worst weekly finish for the S&P 500 in two years as investors took comfort from news that Portuguese central banks unveiled a plan to rescue troubled Banco Espírito Santo.

The S&P 500 (SPX) opened 4 points, or 0.1%, higher at 1,930. The Dow Jones Industrial Average (DJI) added 21 points, or 0.3%, to 16,506. The Nasdaq Composite (RIXF) began the day up 21 points, or 0.5% at 4,373.

Follow MarketWatch's live blog of today's stock-market action.

The data calendar is empty for Monday and few earnings reports are expected.

Portugal's central bank late Sunday announced a rescue plan that includes breaking up Banco Espírito Santo and pouring in billions of euros in state money. The upheaval surrounding the bank has some investors worried about renewed turmoil for Europe's banking system. That news drove a rally in Portugal stocks and also inspired some gains in Europe .

Otherwise, with no U.S. data on the docket, investors will likely be focusing on last week's performance, which included the biggest weekly drop in two years for the S&P 500 (SPX). Nonfarm-payroll data missed forecasts, but the gains provided more evidence that the economy continues to gain momentum, which in turn makes it more likely the Federal Reserve could raise interest rates sooner than expected.

The S&P 500 lost 2.7% last week, the worst percentage drop for the index since June 1, 2012, while the Dow industrials (DJI) fell 2.8%, its biggest drop since the week ended Jan. 24.

Low volumes

Joao Monteiro, analyst at Valutrades, said in a note taht there could be a temporary lull in market activity because of the paucity of data and earnings scheduled for Monday. Still, he said investors must remember that August is notorious for lower-than-average volumes.

"It could now be a case of traders sitting on hands in the short term, although with at least the economic calendar set to pick up from tomorrow, any calm could be short-lived," he said.

Readings on services and factory orders are due Tuesday, while data on trade and consumer credit follow later in the week. Read: Paltry credit-card debt growth signals restrained consumers

Mark Haefele and Kiran Ganesh of UBS Wealth Management wrote that investors should not be panicking because valuations are not at extremes, nor are investors "exuberant."

"With U.S. GDP growth still on track, the Fed remaining accommodative, and cash still on the sidelines, now is not the time for investors to head to the exit," said Haefele, global chief investment officer, and Ganesh, cross-asset strategist, in a piece published on CNBC's website. Also read Need to Know for Monday: Traders put big hedges in places as markets set up for a rebound

Amgen Inc. (AMGN) rose 1.7% after the biopharmaceutical company said a Phase 3 clinical trial for a late-stage treatment of multiple myeloma was successful.

Michael Kors Holdings Ltd. (KORS) fell 3.8% even as results topped estimates. Cardinal Health Inc. (CAH) also reported profits that topped estimates, but shares fell 4.2%

Mobileye N.V. (MBLY) rose 7.8% after soaring 48% on Friday, when the company debuted on a stock market. For more on today's notable movers, read our Movers & Shakers column.

Berkshire Hathaway Inc.(BRKA) (BRK/A) could be active after reporting a rise in second-quarter profit and revenue late Friday.

In overseas markets, Asian stocks had a mixed session, with the Shanghai Composite Index up 1.7% and the Nikkei 225 index off 0.3%. Gold prices (GCU4) were flat, while oil (CLU4) ticked lower and the dollar (DXY) recouped some losses from last week.

More must-reads from MarketWatch:

History says don't count on a big correction soon

Three market signs point to 20% tumble for U.S. stocks

Warning: That plunge in stocks is just the beginning

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