Now that the official enrollment period for health insurance under the Affordable Care Act has ended for the year, the surge of sign-ups coming in at the wire seems even stronger than even the most optimistic forecasts had predicted. Enrollment may have even topped the 7 million mark, impressive given's rocky start, mired in technical difficulties.

In this video, Motley Fool health-care analyst David Williamson discusses the official closing of open enrollment, breaks down what the numbers mean for insurers and their investors, and talks about the loophole that means enrollment may not end completely for another 60 days.