Why the Tesla Stock Price Is Up 28% in Three Months

The Tesla stock price is up another 1.1% in the last five trading sessions and has now climbed 28.2% in the last three months.

At Monday's high of $285.30, the Tesla Motors Inc. (Nasdaq: TSLA) stock price is very close to the all-time high of $291.42 it set in September 2014.

On Friday, CEO Elon Musk unveiled new upgrades to the Model S sedan. They included larger car batteries and new price points. The company also announced the new "Ludicrous Mode" available on some new vehicles, which lets the car go from 0 to 60 mph in 2.8 seconds.

It was the latest announcement in a string of good news that has sent the Tesla stock price soaring since April. Here are three other reasons behind