I think that it was really strange that in January when BTC went down all big cryptocurrency exchanges closed registration for new members and they opened it only when the price was low. Then at spring when the downtrend was broken(7000$) there were many news that cryptocurrency now will go up! But whales just made big shorts at 10 000 $and all the news said that cryptocurrency won't go up for along time and market went down to current position.
There are people who are manipulating the market price because they want to invest a huge amount in order to earn more profit when the market starts to pump up again in the future.
Whale is doing that. Those people that has higher capital or bought the coins at a discounted price with a huge amount of coins. It happened to majority of coins base on my opinion but as the distrubution is widely spread, I think we minimize this kind of scheme.