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If a market maker wanted to avoid filling option orders from a specific account, what information could they use?

FIX has a few fields that do or could contain identifying information for equity option orders, the “Actionable Identifier” field in particular, although the OCC states here that “It will not be ...
opq's user avatar
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FIX engine for very low latency

We are building a new system where latency is key. Either commercial or opensource, our goal is to have an easy to implement fix engine where low latency is key.
Ariel Silahian's user avatar