Right, so the reason all these banks run extremely expensive HFT divisions is to guarantee the best possible price to their customers. Got it. I&#x27;m glad they have our back! &#x2F;s<p>As someone who has actually seen the scenario described above play out, I&#x27;m not so sure: stock doesn&#x27;t move for minutes at a low volume time of day, the moment I place my limit order the price is suddenly higher than my limit; rinse and repeat. I&#x27;ve seen this happen enough times to make me believe Reg NMS is just another regulation they&#x27;ve found a plausible deniability around (BTW, before you tell me &quot;prices going up when you place a big order is how the market works&quot;, I&#x27;ve tested this with 100 share orders, so there was no order split going on. I still got priced out.)