very low confidence I wanted to say "yes." -- but from a cost-type pow (it's cheaper to transact off-exchanges, clearing trades internally in say a hedge fund or large bank). 

_Probably_ not what you're getting at. Educate me??

denlillaapan

econ

Dark Pools, Stock Trading, and Financial Markets (Bloomberg, Matt Levine)

Easy to find out: Does your understanding imply that a person inside the Darkpool could make 💸💸 by simply buying/selling from the pool and arbitraging to the open market?

if yes, your understanding is probably incorrect

if no, at least the broad strokes are correct