The 100 share trades are widely known as market maker signals. If a market maker has buy orders to fill without stock on his books, he will place a 100 share (Need shares) trade, hoping to "borrow" shares from another m/m.
Here's the rest of the signals:
100 I need shares. 200 I need shares badly,but do not take the stock down. 300 Take the price down so I can load shares 400 Keep trading it sideways. 500 Gap the stock. This gap can be either up or down, depending on the direction of the 500 signal.
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