Computers that trade on the news

Math-loving traders are using powerful computers to speed-read news reports, editorials, company Web sites, blog posts and even Twitter messages — and then letting the machines decide what it all means for the markets.

The development goes far beyond standard digital fare like most-read and e-mailed lists. In some cases, the computers are actually parsing writers’ words, sentence structure, even the odd emoticon. A wink and a smile — ;) — for instance, just might mean things are looking up for the markets. Then, often without human intervention, the programmes are interpreting that news and trading on it.

Given the volatility in the markets and concern that computerized trading exaggerates the ups and downs, the notion that Wall Street is engineering news-bots might sound like an investor’s nightmare.

But the development, years in the making, is part of the technological revolution that is reshaping Wall Street. In a business where information is the most valuable commodity, traders with the smartest, fastest computers can outfox and outmaneuver rivals.

Many of robo-readers look beyond numbers and try to analyse market sentiment, that intuitive feeling investors have about the markets. Like the latest economic figures, news and social media buzz — “unstructured data,” as it is known — can shift the mood from exuberance to despondency.

Tech-savvy traders have been scraping data out of new reports, press releases and corporate Web sites for years. But new, linguistics-based software goes well beyond that. News agencies like Bloomberg, Dow Jones and Thomson Reuters have adopted the idea, offering services that supposedly help their Wall Street customers sift through news automatically.

Some of these programmes hardly seem like rocket science. Working with academics at Columbia University and the University of Notre Dame, Dow Jones compiled a dictionary of about 3,700 words that can signal changes in sentiment. Feel-good words include obvious ones like “ingenuity,” “strength” and “winner.” Feel-bad ones include “litigious,” “colludes” and “risk.”

The software typically identifies the subject of a story and then examines the actual words. The programmes are written to recognise the meaning of words and phrases in context, like distinguishing between “terribly,” “good” and “terribly good.”

Bloomberg monitors news articles and Twitter feeds and alerts its customers if a lot of people are suddenly sending Twitter messages about, say, IBM. Lexalytics, a text analysis company in Amherst, Massachussets., that works with Thomson Reuters, says it has developed algorithms that make sense out of Twitter messages. That includes emoticons like the happy-face :) and the not-so-happy :. Skeptics abound, but proponents insist such software will eventually catch on with traders.
The computer-savvy traders known as quants are paying attention. According to Aite Group, a financial services consulting company, about 35 per cent of quantitative trading firms are exploring whether to use unstructured data feeds. Two years ago, about 2 percent of those firms used them.

Quants often use these programs to manage their risks by, say, automatically shutting down trading when bad news hits.

But industry experts say the programs are also moving the markets. Last May, as Greece’s financial crisis deepened, Wall Street computers seized on a news story with the word “abyss” in the headline and initiated sell orders, according to industry experts.

But some warn of a growing digital divide in the markets. Well-heeled traders who can afford sophisticated technology have an edge over everyone else, these people say.

Experts are already talking about the next thing — programmes to automatically digest broadcast and closed-caption television.

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