Nate's Food Company (NHMD)

[shotsky]

You can't tell what is happening by the trades you see. You don't see full trades, you see only tranches, which is the amount an MM will buy or sell at one time.
I've had traches of only 1 share at times, when buying or selling 1M shares. There might be 50 tranches to complete a single buy or sell. Look at any MM's spread...there is what they will pay for shares, what they will sell for and HOW MANY they will trade at those prices. Those are tranches, and looking at them tells you exactly nothing.
Here is the spread on Ford:
Bid: $12.02 x 12575 Ask: $12.03 x 12490
That means they will buy 12575 at 12.02 and will sell 12490 at 12.03.
By law, if an order comes in that meets their spread they HAVE to make the trade, but only for the quantity stated. Then, they can change their spread (and usually do) to make it more profitable for them.