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

Robert Half International Inc. (symbol: RHI) was one of the worst losers of
the trading day today (2016-04-27), losing -12.26%. The number of shares
that changed hands was 5,418,052, or about 4 times the average daily volume
in the stock.
The closing price was $39.13, amounting to a market cap of $5,050,000,000,
about -32.77% off the highest price in the last 12 months. The stock has
been trading at a range between $36.17 and $58.2.
RHI is in the Professional Services industry, part of the Technology sector.
Looking at its valuation, the stock is now trading at 14.55 times earnings.