From the INET---Market maker signals when "bull$hitting" each other
Reading Market-Maker Signals The signs they send each other to move stock prices. Many traders believe that market makers will "signal" moves in advance by using small amounts of buys or sells as "signals". The "signals" are from one market maker to another. https://falconstocks.com/articles/readingmarketmakers.html
100 I need shares.
200 I need shares badly, but do not take the stock down.
300 Take (or I am taking) the price down so I can load shares