Newest weapon in U.S. hunt for insider traders paying off

By Nate Raymond

NEW YORK, Nov 1 (Reuters) - When plumber Gary Pusey pleaded guilty in May to insider trading, it was a victory not just for New York prosecutors but for a little-known squad inside the U.S. Securities and Exchange Commission that uses data analysis to spot unusual trading patterns.

Formed in 2010, the Analysis and Detection Center of the SEC's Market Abuse Unit culls through billions of rows of trading data going back 15 years to identify individuals who have made repeated, well-timed trades ahead of corporate news.

The new strategy is starting to show results, enabling the SEC to launch nine insider trading cases, around 7 percent of cases the agency brought since 2014 against people who trade on confidential corporate information.

It signals a shift in how the agency initiates insider trading probes, which more often are launched based on referrals from Wall Street's self-regulator Financial Industry Regulatory Authority, or an informant's tip.

"It's essentially the new frontier," said Andrew Ceresney, the SEC's enforcement director. "We have tremendous amounts of data available to use, and we've been developing tools to take advantage of that."

That data was key to spotting trades by Pusey ahead of at least 10 deals from 2014 to 2015 involving Barclays Plc , where his friend Steven McClatchey worked.

The SEC has also used data mining in a high-profile probe of traders who it says made more than $100 million using information obtained by Ukrainian hackers.

Others charged include former employees of law firm Wilson Sonsini Goodrich & Rosati and investment bank Goldman Sachs Group Inc.. In August, former Perella Weinberg Partners banker Sean Stewart was convicted in a case credited to the SEC unit. He denies wrongdoing and is expected to appeal.

10 BILLION ROWS OF TRADING DATA

The cases have come at a time when other U.S. and European regulators have increasingly looked to find ways to take advantage Big Data in order to strengthen their enforcement operations and market surveillance.

The United Kingdom's Financial Conduct Authority has in recent years taken steps to develop technology to analyze large amounts of data to pursue market abuse cases.

For the SEC, the six-year data-push has had the benefit of giving it some extra autonomy in pursuing insider trading probes beyond the inquiries and referrals that self-regulatory organizations like FINRA produce for the agency.

"Why wait to do a referral when you could do it proactively?" said Daniel Hawke, a former chief of the SEC's Market Abuse Unit now at the law firm Arnold & Porter.