Warner Bros. Pictures

A Robinhood trader said he turned $5,000 into more than $130,000 thanks to Tesla's wild stock rally.

A Reddit user with the name Kronos_415 said he netted the twenty-six-fold return in under a month by trading call options.

He argued that an $800 stock price was fair given Tesla's innovations and aggressive expansion.

"Anything beyond $900 for Tesla is purely speculative, as their financials can't legitimately back a valuation that high yet," he said.

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A Robinhood user said he turned $5,000 into more than $130,000 thanks to Tesla's remarkable stock rally this year.

The trader, who has the username Kronos_415 on Reddit, said he netted the twenty-six-fold return in under a month. He told Business Insider that he's a 28-year-old business analyst in Washington, DC, who began investing six months ago. He declined to share his name.

The amateur investor and member of the WallStreetBets subreddit first bought Tesla options on Robinhood's stock-trading app on January 3. He made the decision after reading a slew of good news about the company, including the opening of its new Gigafactory in Shanghai and the first deliveries of its Model 3 cars in China.

The electric-car maker's stock surged more than 50% last month, to about $650 from $430. As a result, Kronos_415 was able to turn his "meager" $5,000 into $51,000, he said.

Next, he spent nearly $27,500 of his earnings on seven Tesla calls on February 3. Each of the options granted him the right to buy the stock at $700 until February 21. After the stock surged, he sold each call — worth $3,925 when he bought them — for $17,025, more than quadrupling his money.

Read more: An investor crushing 98% of his peers told us why Tesla's meteoric rise echoes the dot-com bubble era — and warns it's super-dangerous to buy now

Kronos_415 said his Tesla windfall totaled almost $131,000. A screenshot that he shared in the WallStreetBets subreddit backed up his story.

Reddit/Kronos_415

Tesla surged nearly 30% over Monday and Tuesday, prompting numerous skeptics to warn that its gains weren't sustainable. Indeed, the stock closed 17% lower on Wednesday, at $735.

However, Kronos_415 argued that the run-up was warranted.

"I feel that the rally this week is well deserved," he told Business Insider. "The strides Tesla is making in terms of battery technology combined with their aggressive rollout of vehicles and factories in emerging markets shows that they are hungry.

"I think a fair market price is $800," he continued. "When I saw it reach $900 to $950, I expected the pullback. Anything beyond $900 for Tesla is purely speculative, as their financials can't legitimately back a valuation that high yet."

Kronos added that he wouldn't be surprised if Tesla stock more than doubled to $2,000 in the next few years. In the meantime, he said he planned to grow his profits in an "aggressively managed" brokerage account, potentially leaving $5,000 to continue trading options on Robinhood.

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