William Blair Downgrades Polypore International (PPO) to Market Perform Feb 24, 2015 07:36AM
William Blair Upgrades Polypore Int'l (PPO) to Outperform; Tesla (TSLA) 'Gigafactory' Opportunity Outweighs Other Risks May 14, 2014 09:09AM
William Blair Upgrades Polypore International (PPO) to Outperform May 14, 2014 08:50AM
William Blair Downgrades Polypore International (PPO) to Market Perform Feb 20, 2014 09:07AM
Streetinsider.com's Hot Lunchtime Reads 11/05: (MRVL) (AAPL) (HTZ) (AEIS) (PPO) Nov 5, 2013 12:13PM


Nov 5, 2013 12:01PM William Blair Keeps Polypore (PPO) at Outperform; Still Plenty of Positive LT Catalysts
Aug 27, 2013 01:18PM Polypore (PPO) Likely to Continue as Supplier for Nissan Leaf Battery
Jan 21, 2010 08:29AM William Blair Upgrades Polypore International (PPO) to Outperform