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For 3 months in 2015, Tesla did something we've almost never seen before
tesla
tesla

(Justin Sullivan/Getty Images)

Even if you have no opinions about Tesla, you can take two simple steps to understand what one aspect of the company is all about.

Take a look at its stock chart.

Then draw a line at about March 11, 2013:

Tesla Chart 7-25-15
Tesla Chart 7-25-15

(Screenshot via Yahoo Finance)

Tesla's 2010 IPO price was $17. After a bit of a bump, for roughly the first two years of its life as a public company the stock traded flat.

Then the stock exploded. Eventually, it would surge to $291 in September 2014 and give Tesla a market cap in excess of $30 billion.

CEO Elon Musk was a multibillionaire. Anyone who had bought shares after the IPO saw a better than 1,000% return.

Of course, that return came with a very typical price: volatility. As you can see from the chart below, after a gradual increase in 2013 Tesla went on a wild, wild roller-coaster ride. Investing was not for the weak or timid.

It wasn't until three months in 2015 that Tesla stock stopped being volatile and starting climbing steadily — signaling that Tesla is becoming a different kind of company.

Tesla chart 7-25-15 2
Tesla chart 7-25-15 2

(Screenshot via Yahoo Finance)

Old Tesla and new Tesla

Prior to its IPO, Tesla was effectively an advertisement for the potential of all-electric cars. It was also a member of a crowded field of startups. Tesla was selling one vehicle, the high-performance Roadster, hardly a practical car, but certainly — as I found out when I drove one — a very fast car.

The idea was straightforward: The electric car of the future can't be a golf cart; it needs to be a Ferrari powered by electrons. A good idea, but not one that had yielded financial stability. Tesla went through several near-death experiences before and after the Great Recession; it was dependent on a Department of Energy loan of almost $500 million, and it sold chunks of itself to traditional automakers to raise capital.

But then the second Tesla vehicle came along — the Model S sedan — and it was rapturously received by the media. Motor Trend named it Car of the Year in 2013. The customers lined up. The stock took off. Wall Street analysts began to establish dizzying price targets. Tesla became the hottest growth story in all the land.

However, the ups and downs were vertiginous. Every few months, Tesla endured an emperor-has-no-clothes moment and the stock got hammered, only to rebound flamboyantly.

Tesla was a trader's stock, an ideal candidate to make bets on if you thought it was going to rocket higher over the course of a few months — or if you thought it would tank and figured that a company building one car in one factory and selling it to affluent early adopters was there for the shorting.