Key Points Zscaler’s stock is down nearly 30% since the start of November, erasing all of its gains since May.  It's a tough beat for investors as the company keeps beating expectations on its headline numbers.  However, analysts remain overwhelmingly bullish, with some calling for as much as 60% upside from current levels. MarketBeat previews top five stocks to own in December. Shares of Zscaler Inc. (NASDAQ: ZS) have been going through a rough patch, sliding nearly 30% in just a few weeks and br ...