SuperDOT

~ the last words ~

On 1 March 1976 the New York Stock Exchange switched on something called Designated Order Turnaround, which let a member firm send a hundred-share order straight to the specialist's post instead of handing it to a floor broker to walk over. It was not electronic trading. A human still matched the order and a human still set the price. What had been automated was the walking.

In 1984 the system was rebuilt and renamed SuperDOT, and the ceiling went from a hundred shares to a hundred thousand. That single change is most of the story of the next two decades on Wall Street. Once you could fire an order of institutional size down a wire and get a fill confirmation back without a person carrying paper in either direction, index arbitrage and program trading became practical, and the volume curve of the exchange turned upward and stayed there. By the late 1990s SuperDOT was carrying something like nine tenths of everything the exchange traded.

It died in a migration rather than a shutdown. On 5 March 2009 the NYSE sent an information memo from 11 Wall Street to every member firm and vendor on the common customer gateway, announcing that cash equities were moving off the SuperDOT databases onto a newly implemented Super Display Book, phase by phase, on a stock by stock basis beginning on or about 13 March. Good-till-cancelled orders sitting at the post were to be carried over automatically the evening before each stock moved. By the time the last symbol crossed, every order arriving at the exchange was landing in a different database.

The system and I are the same age, give or take, and that is most of the distance I have on it. SuperDOT was switched on in a year I have no memory of, in a building I have never been inside, for a market that was closed before the Turkish trading day was half over. I came to it from the archive side: a memo, a press release, and a Wikipedia stub that gets the year right and the rest thin.

~ the record ~

~ the wire ~

SuperDOT was order routing and only ever order routing: a pipe from the member firm's back office to the correct specialist post on the floor, plus a return path for the execution report. The specialist still ran the auction by hand at the point of sale. Everything that made the NYSE feel like a nineteenth century institution well into the 2000s was preserved by this piece of 1984 software, because SuperDOT made the old arrangement fast enough to survive the arrival of computers.

~ black monday ~

On 19 October 1987 the pipe filled. Orders poured into DOT faster than the floor could work them, printers ran behind, and the tape was reporting prices that had been true twenty minutes earlier. Traders were selling into quotes that no longer existed. The official post-mortems spent a lot of pages on this, and the exchange spent the following years raising capacity and adding circuit breakers, which is the sort of fix you make when the system did not break so much as succeed past the point the humans at the other end could keep up.

~ the migration memo ~

The 2009 memo is a good document to read if you want to know what retiring critical infrastructure actually looks like. No ceremony, no farewell to a system that had been running since the Reagan administration. Instead: which order types migrate automatically, which ones get deleted the evening before, how booth routing changes, and where firms can check the running list of migrated symbols. A memo six weeks earlier had put the number on what the whole overhaul was for, with order entry moved onto a new gateway and round-trip latency down from around 110 milliseconds to 65.

Super Display Book did not last long enough to earn a eulogy of its own. In 2012 the NYSE replaced it with the Universal Trading Platform, and the specialist, by then renamed a designated market maker, was working a screen.

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