“OATS data is integral to Finra’s automated market surveillance program to detect manipulative activity and other potential violations of Finra rules and federal securities laws,” Thomas Gira, executive vice president of market regulation, said in the statement.

From July 2006 to March 2015, Goldman Sachs transmitted inaccurate or incomplete information on more than 20 percent of all trading data submitted to Finra, the regulator said.

The conduct centered around the firm’s dark-pool trading venue Sigma X, which has been working on improving its technology. The New York-based bank hired Raj Mahajan, the former head of high-frequency trader Allston Trading, in January to run its equities electronic execution business, which includes the dark pool.

“We’re pleased to have concluded this matter,” Tiffany Galvin, a spokeswoman for Goldman Sachs, said in an e-mailed statement. “We self-reported many of the issues to Finra, voluntarily took steps to fix those issues, and provided substantial assistance to the Finra staff conducting the investigation.”