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

Iridium Communications Inc (symbol: IRDM) was one of the worst losers of
the trading day today (2016-09-01), losing -6.72%. The number of shares
that changed hands was 3,142,471, or about 5 times the average daily volume
in the stock.
The closing price was $7.77, amounting to a market cap of $743,020,000,
about -17.08% off the highest price in the last 12 months. The stock has
been trading at a range between $5.85 and $9.37.
IRDM is in the Telecommunications Equipment industry, part of the Consumer
Durables sector.