Stocks are a buy so ignore the gloom: Technician By: CNBC.com News May 03, 2015 at 10:57 AM EDT Stocks finished off the month with a whimper, but Oppenheimer technical analyst Ari Wald says the sell-off is a great buying opportunity. Read More >> Related Stocks: Amgen Nasdaq Biotechnology Ishares ETF Sentinelone Inc Cl A