A supernova is a spiffy-pop event that occurs for a stock that is widely held by our Motley Fool membership.

An example occurred on April 22, 2010, when Netflix spiffy-popped for Motley Fool Stock Advisor. By dint of having been a multi-re-recommended stock by both David and Tom Gardner, and occurring so frequently as a Best Buy Now and as a Core holding on the service, Netflix had risen in popularity to become the second most-owned stock among the Motley Fool Stock Advisor membership, and the fifth most-owned stock in all of Fooldom.

So when Netflix spiffy-popped, it earned the distinction of supernova.

By "widely held," we generally mean a stock that is among our membership's top 20 holdings, in aggregate.

In addition to creating broad and wild amounts of wealth across our far-flung membership, supernovas generate great excitement at Fool HQ. There's really no greater investment happiness a Motley Fool stockpicker can ever feel than generating supernovas for our Fools.

One week to the day later, on April 29, 2010, Baidu became a supernova for Motley Fool Rule Breakers. It rose $88.49 that day, exceeding its Nov. 2006 cost of $83.37. Baidu was picked by Rick Munarriz (TMFBreakerRick).

Netflix then went supernova a second time in 2010. On Oct. 21, 2010, Netflix shares rose $19.54 to an all-time closing high of $172.69.

Netflix then went supernova a third time in 2010. On Nov. 22, 2010, Netflix shares rose $15.28 to another all-time closing high of $188.32.

After reporting Q4 2010 results, Netflix went supernova a fourth time on Jan. 27, 2011. Shares rose $27.84 to an all-time closing high of $210.87. This one was remarkable, because it was also a spiffy-pop for all five active recommendations for Motley Fool Stock Advisor at the time.

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