Interesting. I have never heard that term before. I assume a "preferenced order" is different from customer priority? Would you mind explaining/talking about a "preferenced order" a bit more? Thanks.
The first filings for preferencing go back to the early 2000s. There is also preferenced liquidity, but that is more relevant SN. "This new order type will allow Participants to designate a Market Maker (a “Preferred Market Maker”) to receive an allocation preference with respect to a percentage of the Preferenced Order." If I remember Optionhouse - they drove these filings and did SPX for free. This is also a part - not all - of the driver behind creating so many exchanges. Guarantee some flow - collect ORF and voila, you open at breakeven. Also a driver in the Pro - customer membership
You wrote “Flat free” in one place and $.65 in another place. What’s the Lowest charge anyone has seen To trade SPX options?