That's one of the purposes of darkpools, to let institutions trade large size without moving the market. No one's getting manipulated here: both the buyers and

That's one of the purposes of darkpools, to let institutions trade large size without moving the market. No one's getting manipulated here: both the buyers and sellers know what's going on. You can trade on these yourself - the darkpool operators are always looking for new market makers. All you need to do is agree to quote a few hundred US equities in decent size inside the NBBO, six and a half hours a day, and you too can have access to this flow.