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Pokémon, whoa.

Nintendo is now worth more than double what it was before the launch of Pokémon Go, as investors continue to drive up the price of the video game company's stock.

In dollar terms, Nintendo has added a whopping $23 billion to its value in less than two weeks.

The chart below illustrates just how steep the rally has been.

NTDOY data by YCharts

The share price increase has sent Nintendo's market capitalization -- the value of the company based on its stock price -- to more than $40 billion.

That's more than one of its rivals in the video game industry, Sony, which is around $38 billion.

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Nintendo's shares rose almost immediately after the game was released and skyrocketed after the popularity of Pokémon Gobecame apparent. Some firms have released data showing it to be the most popular mobile game of all time, with daily active users rivaling some of the most popular apps including Google Maps and Snapchat.

The frenzy has also meant a lot of money and shares trading hands. The sheer volume of trading has been staggering. Nintendo now owns the record for the most traded stock in the history of Japan's market.

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Nintendo's rally comes despite only having a tangential interest in Pokémon Go.

The game itself was developed by Niantic, a private company that spun out of Google. The Pokémon characters are property of The Pokémon Company. Nintendo has an partial ownership stake in both those companies, meaning they'll get a cut of the game's success.

Nintendo's stock rally, however, has been widely attributed to the possibility that the company will be able to translate the success of Pokémon Gointo future games with its popular game franchises including Mario Bros. and The Legend of Zelda.

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