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Why do I see multiple trades of very small quantities?
Probing for hidden limit orders usually involves sending the orders and then cancelling them before they get filled if they don't get filled. With trades actually going through multiple times for small amounts it looks more like a VWAP strategy where the trader is feeding small volumes into the market as part of a larger trade trying to minimize average cost. It could be probing but without seeing the orders and any cancels it would be difficult to tell. edit: I just had another thought; it could possibly be a market maker unwinding a bad position caused by other trading. Sometimes they drip trades into the market to prevent themselves from hitting big orders etc. that might move back against them. This is probably not right but is just another thought. source: I work for an organization that provides monitoring for these things to many large trading organizations.