How Roaring Kitty’s $53,000 GameStop stake became nearly $48 million — on paper

A Monmouth case study likewise describes Gill as the kind of investor looking for “deep value” — overlooked aspects of a company that may give it non-obvious value.

He was not the only early investor to see a possible mispricing. TradingSim’s account notes that Michael Burry, known for shorting the U.S. housing market before the financial crisis, bought GameStop in 2019 because he believed the stock was undervalued. But Burry sold before the major short squeeze arrived.

That distinction matters. Gill’s edge was not just that he liked GameStop. It was that he built the position early, kept holding it, and kept making his thesis public through YouTube and Reddit before the market structure turned extreme.

The short squeeze turned a rising stock into more buying

The core market mechanic was the short squeeze. Short selling means borrowing shares, selling them, and hoping to buy them back later at a lower price. If the price falls, the short seller profits; if the price rises, losses can mount quickly.

GameStop’s setup was unusually crowded. One source says short interest in January 2021 exceeded 140% of the public float — the shares available for public trading. When the stock began rising, short sellers who wanted to limit losses or close positions had to buy shares back. That buying pressure helped drive the price even higher, creating the classic squeeze dynamic.

In other words, the rally was not powered only by ordinary bullish buying. A rising price increased pressure on short sellers; short covering created additional demand; that demand pushed prices higher again. The loop fed on itself.

The impact on professional short sellers was severe. Melvin Capital, which had heavily shorted GameStop, lost about 53% by the end of January 2021, and Citadel, its partners, and Point72 provided a combined $2.75 billion in support.

Call options amplified the upside — and the risk

Gill’s position included not only GameStop shares but also call options. That matters because calls can become far more valuable when the underlying stock rises sharply, especially if the move happens before the options expire.

The shares gave him direct exposure to GameStop’s stock price. The options added convexity: if the stock surged, the options could rise much faster than the stock itself. That helped explain how a five-figure starting position could show an eight-figure paper value during the squeeze.

But options are not free leverage. They also add timing risk. If the stock does not rise enough, or does not rise before expiration, the option portion can lose value quickly. Gill’s posted gains reflected both being directionally right and already holding a highly responsive position before the January 2021 explosion.

Reddit helped turn an investment thesis into a market event

January 2021 also brought fresh catalysts. TheStreet’s timeline notes that activist investor Ryan Cohen joined GameStop’s board on January 11, 2021, alongside two former Chewy executives, Alan Attal and Jim Grube. GameStop discussion then continued spreading across r/WallStreetBets.

Other accounts link the January surge to heavy buying by retail investors on r/WallStreetBets.

Still, it is important to separate Gill’s thesis from every later trader’s motivation. Vernimmen’s research material says Gill’s arguments were based more on the company’s fundamental value, while many retail investors who joined later were more focused on making money from a short squeeze against large hedge funds.

Put differently, Gill supplied a narrative that was easy to understand and share: GameStop was undervalued and over-shorted. Reddit buying, option positioning, and forced short covering turned that narrative into a rare market event.

Why most traders cannot simply copy the playbook

The tempting lesson is “find the next GameStop.” The more useful lesson is that the outcome depended on several conditions lining up at once.

First, being early is not the same as being paid quickly. Burry saw the GameStop opportunity early but sold before the huge squeeze, which shows the gap between identifying a possible mispricing and capturing the most violent part of the move.

Second, high short interest is not a guarantee of a squeeze. A crowded short position can create fuel, but it still needs a spark: sustained buying, a compelling story, and price pressure strong enough to force short sellers to cover.

Third, late entry changes the risk-reward profile. Gill’s advantage came from an early cost basis, a long-public thesis, a stock-and-options position, and an extreme short-interest structure. Many later buyers entered only after the price had already moved violently. The same squeeze mechanics that can magnify gains can also magnify losses when buying fades and volatility turns.

The real lesson is structure, not imitation

Roaring Kitty’s GameStop gains do not require a mysterious explanation. The available record points to a multi-part answer: he formed a contrarian deep-value view, bought shares and call options early, publicly argued that GameStop was undervalued and over-shorted, and then benefited when Reddit buying and an extreme short position created a historic squeeze.

What makes the GameStop episode valuable to study is not that it offers a repeatable get-rich formula. It is that it compressed several market forces into one dramatic case: fundamental disagreement, short-selling mechanics, options leverage, online community behavior, and institutional risk management.

That combination explains why Gill’s position could show extraordinary paper gains. It also explains why treating the episode as a simple trade to copy misses the point.