Stocks, Sectors to Watch in June

Beware of solar energy stocks heading into June, OptionMonster's Jon Najarian said Friday.

"Can they actually make money now? I think the jury's still out on that, so I would be fading them in June," he said.

On CNBC's "Fast Money," Najarian noted that such companies as First Solar, SunPower and Canadian Solar have seen a big jump in their share price recently, up to 50 to 70 percent in the past month, benefiting in part from tariffs on Chinese dumping of solar panels.

Najarian also pointed to a recent Goldman Sachs upgrade of solar stocks.

(Watch Video: Jim Cramer's Mad Dash: Goldman's Solar Call)

"It's now show-me time," Najarian added.

OptionMonster co-founder Pete Najarian said that he was still a fan of the financial sector.

With a recovery in the housing market, shares of home builders were "a little bit overpriced," he added.

"I look at the financials, they aren't," he said. "They're underpriced. I still see a lot of upside there."

Trader disclosure: On May 30, 2013, the following stocks and commodities mentioned or intended to be mentioned on CNBC's "Fast Money" were owned by the "Fast Money" traders: Mike Murphy is long BAC; Mike Murphy is long INTC; Jon Najarian is long AAPL; Jon Najarian is long JPM; Jon Najarian is long MSFT; Jon Najarian is long CSIQ; Jon Najarian is long NEM; Jon Najarian is long OVTI; Jon Najarian is long AFFY; Jon Najarian is long CLSN; Jon Najarian is long ORPN; Jon Najarian is long TMO; Jon Najarian is long ZNGA; Steve Weiss is long AAMRQ; Steve Weiss is long C; Steve Weiss is long BAC; Steve Weiss is long SODA; Pete Najarian is long AAPL ; Pete Najarian is long BAC CALLS; Pete Najarian is long C CALLS; Pete Najarian is long JPM CALLS; Pete Najarian is long MS CALLS; Pete Najarian is long XLF CALLS; Pete Najarian is long CSCO CALLS; Pete Najarian is long YHOO CALLS; Pete Najarian is long BBRY; Pete Najarian is long SBUX; Pete Najarian is long FB; Pete Najarian is long MSFT; Pete Najarian is long MRK; Pete Najarian is long BMY; Pete Najarian is long AIG CALLS.