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Buy the biotech bounce: Technician

Biotechnology stocks are on the mend.

The iShares Nasdaq Biotech ETF (IBB) has seen some relief from its selloff, in which the fund fell more than 6 percent over one month. In early trading Tuesday, the ETF was up slightly. Monday the stocks closed up more than 2 percent, prompting one technician to encourage investors to buy in.

"Over the last three years, we've had these kind of questionable periods where it's really tested the investor's resolve to come back," Craig Johnson, technical analyst at Piper Jaffray, said Monday on CNBC's "Trading Nation."

But investors keep coming back to buy the dip, Johnson said, which has kept biotech stocks in an upward trend since 2011. The IBB is up more than 22 percent year to date.

"This again looks to be one of these periods where you want to be buying these biotech stocks," he said.

Read MoreCanary in a coal mine? The drop in this ETF has traders worried

David Seaburg, head of sales trading at Cowen & Co., said the biotech sector still shows promise fundamentally for long-term gains. However, he sees investors shifting funds from biotech stocks to cheap energy stocks that have suffered a major blow this year.

"I think there's some headwinds here, but I don't necessarily see people stepping in to buy the dip like I've had in the past, and I absolutely see people really interested in and dying to buy energy," he said.

The S&P 500 energy sector has lost more than 13 percent this year, dragged down by the fall in oil and other commodities prices.

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Brian Sullivan is co-anchor of CNBC's "Power Lunch" (M-F,1PM-3PM ET), one of the network's longest running programs, as well as the host of the daily investing program "Trading Nation." He is also a frequent guest on MSNBC's "Morning Joe" and other NBC properties.

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