The Securities and Exchange Commission announced that Barclays Capital and Credit Suisse Securities (USA) have agreed to settle separate cases finding that they violated federal securities laws while operating alternative trading systems known as dark pools and Credit Suisse’s Light Pool. The New York Attorney General’s office is announcing parallel actions against the two firms.

Barclays agreed to settle the charges by admitting wrongdoing and paying $35 million penalties to the SEC and the NYAG for a total of $70 million.

Credit Suisse agreed to settle the charges by paying a $30 million penalty to the SEC, a $30 million penalty to the NYAG, and $24.3 million in disgorgement and prejudgment interest to the SEC for a total of $84.3 million.

“These cases are the most recent in a series of strong SEC enforcement actions involving dark pools and other alternative trading systems,” said SEC Chair Mary Jo White. “The SEC will continue to shed light on dark pools to better protect investors.”

“Dark pools have a significant role in today’s equity marketplace, and the firms that run these venues must ensure that they do not make misstatements to subscribers about their material operations,” said Andrew Ceresney, director of the SEC’s Enforcement Division. “These largest-ever penalties imposed in SEC cases involving two of the largest ATSs show that firms pay a steep price when they mislead subscribers.”