Top trader Najarian buys auto parts stock

CNBC "Halftime Report" trader Jon Najarian bought shares of Johnson Controls on Thursday after spotting unusual activity in the options market.

Najarian's CNBC Pro model portfolio is up 6 percent on the year, beating the S&P 500, which has risen 1 percent on the year.

Here is what Najarian sees and why he thinks the stock can rally from here...