Shades of things to come. What happens when we plug the economy of the 
entire world into mindless machines programmed to go to war against numbers.

*Mysterious Algorithm Was 4% of Trading Activity Last Week*

A single mysterious computer program that placed orders — and then 
subsequently canceled them — made up 4 percent of all quote traffic in the 
U.S. stock market last week, according to the top tracker of *high-frequency 
trading <>
* activity. The motive of the algorithm is still unclear. 

The program placed orders in 25-millisecond bursts involving about 500 
stocks, according to Nanex, a market data firm. The algorithm never 
executed a single trade, and it abruptly ended at about 10:30 a.m. Friday. 

“Just goes to show you how just one person can have such an outsized impact 
on the market,” said *Eric Hunsader <>*, 
head of *Nanex <>* and the No. 1 detector of trading 
anomalies watching Wall Street today. “Exchanges are just not monitoring 

Hunsader’s sonar picked up that this was a single high-frequency trader 
after seeing the program’s pattern (200 fake quotes, then 400, then 1,000) 
repeated over and over. Also, it was being routed from the same place, the *
Nasdaq* [COMP  3112.35    -23.84  (-0.76%)   

“My guess is that the algo was testing the market, as high-frequency 
frequently does,” says Jon Najarian, co-founder of “As 
soon as they add bandwidth, the HFT crowd sees how quickly they can top out 
to create latency.” 

*(Read More: Unclear What Caused Kraft Spike: Nanex 

Translation: the ultimate goal of many of these programs is to gum up the 
system so it slows down the quote feed to others and allows the computer 
traders (with their co-located servers at the exchanges) to gain a 
money-making arbitrage opportunity. 

The scariest part of this single program was that its millions of quotes 
accounted for 10 percent of the bandwidth that is allowed for trading on 
any given day, according to Nanex. (The size of the bandwidth pipe is 
determined by a group made up of the exchanges called the Consolidated 
Quote System.) 

*(Read More: **Cuban, Cooperman: Curb High-Frequency 

“This is pretty out there to see this effect this many stocks at the same 
time,” said Hunsader. High frequency traders are doing anything to “tip the 
odds in their favor.” 

A Senate panel at the end of September sought answers on high-frequency 
trading as investigators look into the best way to stop wealth-destroying 
events such as the Knight Capital computer glitch in August and the market 
“Flash Crash” two years ago. 

*(Read More: Ex-Insider Calls High-Frequency Trading 

Regulators are trying to see how they can rein in the practice, which 
accounts for 70 percent of trading each day, without slowing down progress 
and profits for Wall Street and the U.S. exchanges. 


   - Cuban, Cooperman: Curb High-Frequency 
   - Do Markets Need a 'Kill Switch'? <>
   - Ex-Insider: HFT Is 'Cheating' <>
   - Will Glitches Get Worse? <>

“I feel a tax on order stuffing is what the markets need at this point,” 
said David Greenberg of Greenberg Capital. “This will cut down on the 
number of erroneous bids and offers placed into the market at any given 
time and should help stabilize the trading environment.” 

Hunsader warned that regulators better do something fast, speculating that 
this single program could have led to something very bad if big news broke 
or a sell-off occurred and one entity was hogging this much of the system 

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