Today, Wednesday, there were some reasonably large blocks for sale. The total volume for the day was about 160K shares. I would guess that the sellers wanted to reallocate money into the "hot stocks" since the market had a great rally.
WHC is not a good stock to go in and out of. The market maker on the NYSE will not maintain the market when there is only 1000 or 2000 shares for sale or for a buy. Anyone who wants to buy or sell must submit small orders of around 500.
The fundamentals for WHC are very good. By looking at the stock chart for the past 6 months one can see that when "big" blocks want out, watch out. That doesn't mean that WHC is no good - only that in and outers are raising havoc with the stock price.
Good luck to all the longs in WHC. Patience will win in the end.