$ZEN is one of biggest losers #stocks today. read more:

Zendesk, Inc. Common Stock (symbol: ZEN) was one of the worst losers of the
trading day today (2017-01-17), losing -8.76%. The number of shares that
changed hands was 4,361,231, or about 3 times the average daily volume in
the stock.
The closing price was $22.59, amounting to a market cap of $2,150,000,000,
about -29.13% off the highest price in the last 12 months. The stock has
been trading at a range between $14.39 and $31.88.
ZEN is in the EDP Services industry, part of the Technology sector. It
first went public in 2014.