Hi Lovers of Order Execution! Short article by Themis Trading on NYSE limit order jumping "on parity": https://blog.themistrading.com/2019/01/the-cost-of-parity/ . If I understood this article correctly - Designated Market Makers (DMMs), floor brokers, and people who hire floor brokers (Firms - hedge funds, high frequency trading firms, other) are all allowed to trade "on parity" (read - jump ahead of you or at least next to you) with your limit orders even though you sent yours first. Am I understanding this correct or are there angles / nuances I'm missing that makes this not as bad as it seems? What can an individual retail investor (or even a small startup prop firm) do to combat this even to a degree? Thank you for your thoughts!