SunTrust analyst James Sheehan upgraded Westlake Chemical (WLK) to Buy saying the acquisition of Axiall (AXLL) gives the company more exposure to chlorovinyls and less exposure to ethylene "at an opportune time." The analyst raised his price target for the shares to $52 from $44.

As previously reported, Deutsche Bank analyst David Begleiter upgraded Westlake to Buy from Hold with a price target of $174, up from $138. Shares have outperformed over the last 12 months, but the analyst argues its "not too late" as this outperformance has occurred despite weak fundamentals in each of Westlake's its commodity chains. Investors have focused on and rewarded Westlake for its building products business, a leading North American supplier in the premium roofing, sliding, trim and shutter, decorative stone and windows business. While stating that "sum of the parts stories rarely, if ever, work," the firm believes Westlake "could be on one of the rare sum of the parts stories does work."