I will predict the company with a market capitalization of at least $1 billion that will exhibit the largest percentage increase in market valuation on December 22. I am pretty certain of my conviction.
Unfortunately, the company is not publicly traded. It is very likely to be publicly traded one day.
The company is called SpaceX, run by the same genius that runs Tesla Motors (Elon Musk).
Yesterday, they launched a rocket into space. They have done this before and being a private firm, this was no small feat as it was only done before by government-funded/operated space agencies.
The next step in their cost-optimization is being able to get the first stage rocket back to earth in one piece. Since the first stage probably costs around a low 3-digit million amount to construct, you would save a lot of money recovering this piece instead of having it dumped in the ocean.
They managed to do this less than 24 hours ago. Watching this video (the re-entry of the first stage rocket starts around 32 minutes in) is amazing. You can read about their initial attempts here.
My university degree was majoring in physics. I do not believe most people can appreciate how truly difficult this is to get correct.
They still have to figure out some other non-trivial matters, such as how much metal fatigue becomes a factor when reusing rockets, and how to deal with various atmospheric and variable factors that inevitably will come into play when it concerns rocketry, but for the most part, they are very well on their way to total domination of the low-cost space launch market.
After this successful re-entry, if SpaceX was publicly traded, I would guess their market capitalization would be up by 50% in a single day, which will likely top the charts on an ordinarily boring Christmas-time trading day.