Shares of Extreme Networks (NASDAQ: EXTR) fell 19.5% in May 2018, according to data from S&P Global Market Intelligence. The maker of data center networking equipment delivered a weak third-quarter report and modest guidance on May 8. The stock crashed hard and hasn't recovered yet.Extreme Networks' third-quarter sales rose 76% year over year to $262 million, boosted by several strategic buyouts that closed in 2017.