Tape Reading the ZN with order book.

MajorDutch

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Hi

Whilst continuing my studies of tape reading the ZN contract I have noticed that quite often a trade of say 130 contract will go through at a certain price level, within a split second it is very common for an identical or near identical amount of contracts to print in the other direction.

So for example 130 contracts sold at 15s a couple of milliseconds later 130 contracts are bought at 15s. Sometimes the amounts differ slightly so sometimes 150 contracts go through then 151 print the other way.

My question / discussion point is - what is this all about? Is it a trader scratching his trade, is it an algo of some kind. Can anyone offer any explanation of this?
 
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