Catalin Cimpanu reports: The US Securities and Exchange Commission has fined three brokerage firms on Monday for neglecting to secure employee accounts, incidents that led to the exposure of their customers’ data. Cetera Advisor Networks LLC, Cetera Investment Services LLC, Cetera Financial Specialists LLC, Cetera Advisors LLC, and Cetera Investment Advisers LLC (collectively, the Cetera entities); Cambridge Investment Research Inc. and Cambridge Investment Research Advisors Inc. (collectively, Cambridge); and KMS Financial Services Inc. (KMS) all settled with the SEC in three separate lawsuits [PDF: Cetera, Cambridge, KMS], the agency announced this week. Read more on The Record.