By Christopher M. Matthews 

New York state's top prosecutor upped the pressure on Barclays PLC Wednesday, alleging the bank hasn't cooperated with an investigation into the activity of high-speed traders in its dark pool and naming specific employees who were allegedly involved in wrongdoing.

New York Attorney General Eric Schneiderman, who sued the British bank in June, said in an amended civil complaint Tuesday that Barclays had defied subpoenas seeking the testimony under oath of the two top executives running the bank's Equities Electronic Trading Division, which oversees its dark pool.

The complaint alleges the executives--William White, head of electronic trading, and David Johnsen, head of product development--were themselves directly involved in, and oversaw, much of the fraudulent activity in the dark pool, which prosecutors say benefited high frequency traders to the detriment of the bank's retail investors. Dark pools are electronic trading venues that don't post investors' buy and sell orders and only report trades to the public after they take place.

A Barclays spokesman declined to comment on behalf of the bank and for Messrs. White and Johnsen, who are both still employed there.

Mr. Schneiderman's office alleged in June that Barclays constructed its dark pool to benefit high-frequency traders while simultaneously lying to its other clients by saying the pool was designed to protect them from high frequency traders.

In July, Barclays filed a motion with N.Y. State Supreme Court seeking to dismiss the case. The motion said Mr. Schneiderman used misleading information and cherry-picked facts to support his allegation that the bank lied to its clients about the activity of high-speed traders in its "dark pool" and said the case is "based on clear and substantial factual errors."

Write to Christopher M. Matthews at christopher.matthews@wsj.com

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