Video: Here Is Your Investing Playbook for the Rest of 2017

The "buy the dip" strategy is still in play, according to Matthew Cheslock, an equity trader with Virtu Financial.

"It was the first session in 50 that we saw a decline of more than 0.5%," said Matthew Cheslock, an equity trader with Virtu Financial, adding that Thursday's rebound was largely due to strong quarterly results from Walmart (WMT) - Get Report .

The S&P 500 is up 15% since the start of the year.

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