Dow downgraded by Bank of America due to "unsustainable tailwinds" Proactive uses images sourced from Shutterstock Bank of America has downgraded its ratings for three major US chemical companies, citing concerns that recent share price gains may not be sustainable. The investment bank lowered Dow Inc (NYSE:DOW) and LyondellBasell Industries NV (NYSE:LYB) to ‘Underperform,’ while Westlake Chemical (NYSE:WLK) was downgraded to ‘Neutral.’ The move comes after a significant year-to-date rally, with stock ...