Radcom (RDCM +8.2%) opens sharply higher after delivering "spectacular" earnings earlier, according to SA Pro's Valuable Insights, who published a bullish article (check comments section) on the stock just 3 sessions ago (it's up about 70% since). He notes a big jump in gross margins (57% to 67%), with operating expenses declining $100K as revenues jumped to $5.4M from $3.4M.