I can. US Market closed early today at 1:00PM. Market data was finalized at 5:16 PM. Data sent to third parties after 5:16PM today would have been test data -

I can. US Market closed early today at 1:00PM. Market data was finalized at 5:16 PM. Data sent to third parties after 5:16PM today would have been test data - they do this every day and the third party systems receive and then purge the test data. One or more third parties took at as real data, possibly because of the odd market close time, and then re-propagated those prices to the real time systems. The reason this can happen is that certain off book transactions can be/are reported by these third parties. These reports update the stock price.