Order Book help

[MarkedFeed]

HI fellows,

Asking for help or explanation of a situation I can't understand in the order flow reading.

Very often the Bid or Ask quantity doesn't match the execution, but there is two situation:

- Bid or Ask become suddenly very thin but the traded quantity increases. Say 10 goes Bid and it was about 1500 (Bids) and traded about 300 (contracts). Then Bid nearly disappears (57) and Ask becomes huge (2398) and the traded volume say almost 12 times (3894).

-------9---2398
57---10----------3894

I understand someone is hiding Bids but still buying at 10. And may be chows a huge Ask in order to make the market look weak at 9. (If I'm wrong, please, correct me). This is a situation I understand. But I don't understand the second one.

- Bid (3894) or Ask (2389) become incredible huge but the amount of traded contracts become very thin (57), almost inexistent. Sometimes the Bid/Ask still as before but the amount traded dry out.

---------9---2389
3894---10----------57

And trades so for few moments, goes Bid or Offer but the tape shows only a few dozens of contracts traded.

My question is: how this is technically possible and how do you read this? There are thousands of Bids (or Asks) but the execution shows only few real trades. Does it means those guys are pulling they Bids/Asks just few contracts before the last execution? I mean pull the orders just before being filled? Or it means there are really few contract for sale at the moment? But how can Bid show 3894?!

If someone can explain this, it will be really helpful

Thanks


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