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Sounds like misspent youth!

Hull or O'Conner would have been most folks first choice here in Chicago. SIG had a funny reputation as "me too" MM.

Good commentary about SIG and the evolution of the options market...

Securities Fraud Class Actions Spike Again Cases filed since the beginning of 2017 represent more than 20% of all such cases filed since 1997. David McCann Filing federal class-action lawsuits alleging securities fraud is a big-time sport in the United States, and getting bigger all the time...

Is there a lesson here? SPX vs. SPY?

Could limit UK retail's access to EU exchanges and EU residents to UK exchanges.

This is the only TCF related notice I see posted to - not related to obvious error. 11:57:24 ET GEMX Nasdaq GEMX will remove symbol TCF1 before the opening on, Friday, August 2, 2019. All open GTC orders in symbol TCF1 will be cancelled after the close of business today. Please contact Nasdaq...

https://www.cnbc.com/2019/07/31/the-wealth-tax-that-democrats-and-republican-billionaires-both-support.html

The fun thing with linkage is when it gets gamed. Exchange 1 ships to exchange 2 and exchanges 2's quote change. Three MM firms are about 1/2 the volume most days.

https://www.sec.gov/rules/sro/cboe/2009/34-60187.pdf

https://www.cboe.org/publish/RegCir/RG09-084.pdf

Keep in mind most exchanges offer hidden liquidity. A couple of things can happen before you ship. MM's can adjust their quotes to avoid the ship and MM's with hidden liquidity off the NBBO can elect to adjust to the NBBO.

Options Linkage All registered U.S. options markets are linked together on a real-time basis through a network capable of transporting orders and messages to and from each market. The charter of the linkage, according to The Options Clearing Corporation (OCC), is to further increase market...

If you want to trade size in many payoffs - the biggest market can be upstairs. SPX options, volatility products and size trades in single name options are frequently done upstairs. As others have mentioned these are facilitation trades and still allowed under the Volcker Rule. You pay up for...

https://www.alleywatch.com/2019/07/gatsby-raises-another-1-5m-for-its-commission-free-options-trading-platform/

Short version TRADER UPDATE 07/31/2019, 14:24 NYSE AMERICAN OPTIONS: AUGUST 2019 PRICING CHANGES On August 1, 2019, pending effectiveness of regulatory filings, NYSE American Options will be making the following revisions to its Fee Schedule: Changes to Complex CUBE Cap Incentive for...

Simple small changes in fees often move more volume than market events

I'm of the belief that the real intent is to get it into the Democratic platform. I also don't believe they care how long it takes or how much they raise. It murders HFT and that in itself hurts volume and is probably their primary objective. SALT limits were destined not to pass and they did...

See if you find a copy - worth reading/owning given the character of your questions.

Cryptic and short answer, but yes. Mostly related to "mispriced" volatility in equity options and it ain't retail - you need to be fairly quick and have some real $$. Arb. vol. products themselves - mostly trading the term structure and again quick and $$. Not options directly, but convert...