Quote Stuffing

Even as the idiots at the SEC mope about cluelessly, confirming they deserve not one cent of taxpayer money to fund their massively overbloated budget, and should all be summarily fired to collect tarballs in the Gulf of Mexico (and soon Maine), our friends at Nanex have conducted an exhaustive analysis (must read for everybody concerned about market structure), in which they identify the various parties responsible for the market crash, and, drumroll please, High Frequency Trading stands at the pinnacle of culprits for the 1,000 point Dow drop. From their findings: "While analyzing HFT (High Frequency Trading) quote counts, we were
shocked to find cases where one exchange was sending an extremely high number
of quotes for one stock in a single second: as high as 5,000 quotes in 1
second! During May 6, there were hundreds of times that a single stock had over
1,000 quotes from one exchange in a single second. Even more disturbing, there
doesn't seem to be any economic justification for this. In many of the cases,
the bid/offer is well outside the National Best Bid/Offer (NBBO). We decided to
analyze a handful of these cases in detail and graphed the sequential
bid/offers to better understand them. What we discovered was a manipulative
device with destabilizing effect." In other words: enough with all the bullshit about HFT as a liquidity provider mechanism: in reality this is just a facade for the most insidious, computerized market manipulative device ever created. Nanex' conclusion: "What benefit could there be to whomever is generating these extremely high
quote rates? After thoughtful analysis, we can only think of one. Competition
between HFT systems today has reached the point where microseconds matter. Any
edge one has to process information faster than a competitor makes all the
difference in this game. If you could generate a large number of quotes that
your competitors have to process, but you can ignore since you generated them,
you gain valuable processing time. This is an extremely disturbing development,
because as more HFT systems start doing this, it is only a matter of time
before quote-stuffing shuts down the entire market from congestion. We think it
played an active role in the final drop on 5/6/2010, and urge everyone involved
to take a look at what is going on. Our recommendation for a simple 50ms quote
expiration rule would eliminate quote-stuffing and level the playing field
without impacting legitimate trading."