RE: Fill or Kill9 Oct 2020 12:58
Bidd, it is about MM positioning on RSP and the quantity they are prepared to offer right now at the prices right now.
The MM at the lowest buy price may only want to deal 100k at this price, but another will trade 250k higher up. Now if you take the 100k at the lowest price, there is no guarantee that they will trade another 100k at that price or even the next MM will stay where they were and be the next in line. If a biggish trade goes in, they can all change position/remove their offerings because after that trade is a whole new offering etc. So sometimes it may not be advantageous to nibble smaller amounts because before you get your fill the amounts available may have gone completely at that price range, ASK moved and your being offered 0.1 higher. Even if a MM will sell say 350k at a given price if a buy comes in a 150k, they might not leave the 200k hanging there, they might move away completely or move it up in price a few 0.01s
Say there are 4 MMs offering 100k-250k below say 7.3, prices at the exact query being 7.24, 7.25, 7.29 and 7.3 If someone trades the 7.24 and then the 7.25 (if it stays there), you can find the other 2 MMs just clear off and start reoffering at 7.36 and above. The speed in which they move or not is dependent on their need to sell/liquidity/short of shares. Sometimes they like to offer quite a bit that buyers have to churn through so they can be confident to start reloading on the bid.
It really is very LIQUID. And vice versa on the bid....