When you look at the charts of these five companies, you may want to steer clear.

If Brown-Forman (BF.B) violates the $44 level, look out below. Bio-Techne (TECH) is a textbook descending triangle setup -- if shares go below $98, it's a sell.

AT&T (T) looks "toppy" after its recent rally. Look for a correction if shares fail to hold the $40.50 level.

First Solar's (FSLR) long-term downtrend is still intact in 2017. A Phillips 66 (PSX) selloff was triggered last week -- but investors should hold out for earnings to play out before deciding how to trade it from here.

This article was written by a staff member of TheStreet.