The sales intelligence firm Apollo sent a notice to its customers last week disclosing a data breach it suffered over the summer. "On discovery, we took immediate steps to remediate our systems and confirmed the issue could not lead to any future unauthorized access," cofounder and CEO Tim Zheng wrote. "We can appreciate that this situation may cause you concern and frustration." In fact, the scale and scope of the breach has a lot of people concerned.

Learn about your ad choices: dovetail.prx.org/ad-choices