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by minimax 787 days ago
> The NYSE runs out of a public data centre (called NY4) which is run by Equinix.

No. NY4 is in Secaucus. NYSE operates out of an ICE (NYSE parent co) owned facility in Mahwah about 25 miles north of there. They managed to pick out the one big US equities exchange operator _not_ running in an equinix facility.

Sorry but this whole post sounds like someone who is sort of HFT adjacent but doesn't really know what they are talking about. Sending orders at "09:29:59.9999971 at the hope your order arrives at 100ns past 9.30am." What?
1 comments
pclmulqdq 787 days ago
> Sending orders at "09:29:59.9999971 at the hope your order arrives at 100ns past 9.30am." What?

This literally does happen, though. One of the things the hyperscalers have convinced the world is that precise time is hard. Precise time is easy if you are willing to pay extra for your hardware. Sub-10-ns precision is unremarkable when you use PTP.

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minimax 787 days ago
It doesn't happen. All the exchanges have a "Day" order type that you can send before 9:30 that will be live on the book when it opens at 9:30 (or transitions to the "core" session at 9:30, most US exchanges have a premarket session prior to that). The idea of having some sophisticated strategy that sends 100ns before 9:30 is nonsense.
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pclmulqdq 787 days ago
As far as I know, you're correct that this exact trade probably doesn't happen on the US exchanges - day orders do have a matching phase before market open, so it may be advantageous to slide in right afterward, but you likely wouldn't do it without knowledge of the state of the opening auction.

However, sending things just a hair early for scheduled events to catch an exact time is a pretty well-known trick at this point. I remember complaining to the exchange that their clocks weren't precise enough for this to be reliable.

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