Stock futures fell overnight Monday as markets struggled to sustain a comeback rally.
Dow futures fell 110 points (0.34%). S&P 500 futures fell 0.6% and Nasdaq 100 futures fell 1.3%.
Zoom Video shares rose 6% after strong second-quarter guidance. Snap shares fell more than 28% after the company said it will miss earnings and revenue targets and slow hiring.
Last week's steep market sell-off saw the Dow hit its first eight-week losing streak since 1923 and the S&P 500 briefly fall into bear market territory intraday.
The Dow gained 618 points, or nearly 2%, on Monday after a week of losses. The S&P 500 and Nasdaq Composite both rose 1.9%.
Investors wonder if the bounce can hold or if it was a minor relief rally amid the relentless sell-off.
Sofi's head of investment strategy Liz Young told CNBC's "Closing Bell: Overtime" that whipsaws and big ups and downs create a trading environment where it's easy to feel wrong every day.
11 sectors gained on Monday, led by financials. Sector gained 3.23 percent, its best day since March 9.
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