By Tommy Stubbington 

Global stock markets stabilized on Monday following last week's abrupt selloff, with investors remaining confident that the weakness marks a setback rather than a reversal of the multiyear rally in equity markets.

European stocks posted modest gains, while U.S. stock futures pointed to a positive start on Wall Street. The Stoxx Europe 600 and S&P 500 futures were both 0.3% higher midway through the European session.

The relative calm comes after a shaky week that saw the S&P 500 tumble to its worst weekly loss in more than two years, and similar pullbacks for European benchmarks.

There was no single factor behind the declines, investors say, but a buildup of negative news helped shake a market that has grown complacent as stocks ratcheted higher this year out of its slumber. An escalation of sanctions against Russia over the conflict in Ukraine, the messy saga engulfing Portugal's second-largest lender Banco Espírito Santo, and worries about when the U.S. Federal Reserve will raise interest rates have all contributed.

According to Gregor Hirt, chief investment officer for Europe at UBS Global Asset Management, the initial trigger was strong U.S. gross domestic product data last week, which raised fears of an earlier-than expected rise in interest rates. That came at a time when quiet summer markets meant there were fewer buyers to step in and stem declines.

"It's not unusual to see more volatile trade during the summer time--what we have at the moment looks like a temporary correction," Mr. Hirt said.

Annualized GDP data for the second quarter of this year showed growth of 4% Wednesday.

But UBS Global Asset Management, which manages $674 billion of assets, continues to favor stocks over asset classes. Mr. Hirt predicts markets will grow more volatile in the second half of the year, but doesn't expect chunkier declines until the first Federal Reserve rate increase is in sight.

"A larger pullback shouldn't come until four or five months before the first Fed rate hike. The Fed could raise rates in the second half of 2015. That means markets should continue climbing until the first quarter of next year," he said.

Many investors say they have been waiting for an equity-market wobble, but were unsure what the trigger would be.

Stock market gains have left many investors sitting on a bigger chunk of their assets in equities than they felt comfortable with, said Andrew Goldberg, global market strategist at J.P. Morgan Asset Management, which has $1.65 trillion under management.

That means there has been a good reason to sell, even for investors who think stocks will climb further. "I tell clients that by virtue of the market going up so much, your equity allocation has grown to something it wasn't meant to be. You should pull it back," he said.

J.P Morgan Asset Management continues to favor stocks in its portfolios, but has scaled back its allocation somewhat in recent months, Mr. Goldberg said.

Even so, with S&P 500 companies that have so far reported second-quarter earnings pointing to profit growth of around 10% year-on-year, it is difficult to make a case for shifting away from equities, despite concerns over the Fed and Russian sanctions.

"It is going to be difficult for investors to get too wrapped up in all these things when companies are delivering by selling things and cutting costs. For now, the path of least resistance is still up."

Write to Tommy Stubbington at tommy.stubbington@wsj.com

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