There are way more trades than those conducted on NYSE, or even the other lit markets. You have a multitude of dark pools that count for approximately 13% of all consolidated trading volume as well as internal matching that counts for 18% of all consolidated trading volume.
Dark pools do report their trades so it's possible to access it, but internal matching goes unreported, that data is kept by each respective broker.
Dark pools do report their trades so it's possible to access it, but internal matching goes unreported, that data is kept by each respective broker.