First published on the LF0 Research Substack on July 19, 2025. This is for information only and is not financial advice.
Executive Summary
Opendoor Technologies (OPEN), an online home-flipper that had largely been seen as a penny stock, suddenly surged dramatically in July 2025. The stock jumped from around $0.50 in late June to an intraday high near $2.88 by mid-July, a gain of roughly 400% from its 52-week low. In the week ending July 18 alone, OPEN soared about 180%. Trading activity was extraordinary: 541 million shares traded on July 17 (nearly 75% of the 729 million shares outstanding) and 573 million shares on July 18, yet another record day. For context, the stock’s 90-day average volume was only about 85 million shares. This surge in price and volume strongly suggests a short-squeeze and momentum rally rather than a fundamental turnaround. Several factors converged to ignite this rally: a high short interest, a viral bullish call by a hedge fund manager, and retail trader mania on social media.
Catalysts Driving the Short Squeeze Narrative
Hedge fund "100-bagger" thesis and retail hype. The initial spark came from Eric Jackson of EMJ Capital, a hedge fund manager who publicly announced a long position in OPEN and a sky-high $82 price target on social media. He argued Opendoor could be a "100-bagger" over a few years. Jackson pointed to Opendoor’s cost-cutting, market share in iBuying, and the possibility of lower interest rates to justify his bullish thesis. Retail traders seized on this call. After Jackson’s post, Opendoor became one of the top trending tickers on Reddit (r/WallStreetBets) and StockTwits, with sentiment rated "extremely bullish" and message volume exploding.
A crowded short. Opendoor had a very large short interest for a stock of its size, which set the stage for a classic short squeeze. As of late June, about 135 to 153 million shares were sold short, roughly 22 to 25% of the float (float about 616 million shares). This short interest had doubled since early 2025: shorts were about 70 million shares in March and ramped up to about 153 million by mid-June. Goldman Sachs maintained a $0.90 price target and a "Sell" rating on OPEN. Once the buying increased in July, shorts started to feel pressure. When a stock jumps 200 to 300% in a short period, short sellers face mounting losses and margin calls, often forcing them to buy back shares to cover. This in turn drives the price higher, essentially squeezing the shorts.
No fundamental news. Importantly, there was no positive earnings, fundamentals or business news driving Opendoor’s rally. The company’s fundamentals remained weak: it has never posted an annual profit since going public, it lost $368M in the last year, and it carries over $2B in debt. The US housing market in 2025 is sluggish, which hurts Opendoor’s home-flipping model. Opendoor was so beaten down that it faced a Nasdaq delisting warning in May for trading under $1, and the board scheduled a July 28 shareholder vote on a 1-for-10 (up to 1-for-50) reverse stock split to regain compliance. Ironically, the meme-driven price spike lifted shares well above $1, potentially removing the immediate need for a split, though the vote was still set and could itself be a volatility catalyst.
All evidence indicates the surge was "trader-driven and momentum-based" rather than fundamental. As Motley Fool noted, the rally was purely trader-driven and fundamentals did not seem to matter to the traders pushing the stock higher. This is a critical point: such rallies can reverse just as quickly as they arise once sentiment shifts or buying pressure relents.
Gamma Squeeze Dynamics
A notable feature of this episode is the heavy activity in the options market, which likely contributed to a "gamma squeeze" on top of the short squeeze. In a gamma squeeze, aggressive call option buying forces market makers to buy the underlying stock to hedge, which creates a self-reinforcing uptrend in the stock price.
Leading up to and including July 18, 2025 (the third Friday of July, monthly options expiration), traders piled into call options on OPEN. Call volumes hit record highs. Many of these options were short-dated, out-of-the-money calls that suddenly went deep in-the-money as the stock spiked. Strikes in the $1 to $2 range that seemed optimistic a week earlier became easily in-the-money by July 18. This matters because market makers who sold those calls had to delta-hedge their exposure by buying the stock as it rose, further driving up the price. Options traders drove call volumes to record highs and pushed implied volatility sharply higher. There was some late pressure on the put side: activity jumped late in the trading day on Friday the 18th, suggesting some traders were positioning for a reversal.
If a large number of in-the-money call options get exercised at expiration, call sellers must deliver shares. If those call sellers do not already have the shares, they must buy them in the market, creating "forced buying" pressure.
- If call holders exercise en masse: the squeeze could extend a bit longer, since shorts and call writers would need to deliver shares.
- If most call holders simply sold for profit and did not exercise: market makers who bought stock as a hedge can unwind those hedges after expiration, which removes buying pressure and can even turn into selling pressure. In this scenario a pullback could ensue when the new week starts, absent other catalysts.
Opendoor’s price move also caused a recalibration of the options market. Previously, as a sub-$1 penny stock, OPEN’s available option strikes were limited (often capped around $2.50 or $5). With the stock above $2, higher strikes can become available for trading. Some retail traders were already eyeing them: "When the new option strike ranges open, I expect an even greater gamma squeeze. I’ll 100% be buying $5 calls," one Redditor wrote. This is speculative, but new strikes could enable another wave of call buying if enthusiasm remains, though each successive wave may have diminishing impact if the initial frenzy fades.
Summary of the setup. Opendoor’s rally was fueled by a perfect storm of short squeeze, gamma squeeze and retail fervor. The high short interest provided dry powder for a squeeze, the viral hedge-fund call and the WallStreetBets crowd provided the spark, and the options dynamics added fuel to the fire. This sent the stock into a parabolic move disconnected from fundamental valuation.
Can the Squeeze Sustain?
Despite some covering, a substantial short position likely remains. As of the latest report (June 30) short interest was about 135.8M shares (22% of float). It peaked at about 153M in mid-June; by early July some shorts had probably closed, but many may still be underwater and hoping for a pullback to exit. If the stock remains elevated, these remaining shorts could eventually capitulate and cover. Short interest is still a powder keg, but the easiest "quick kill" phase of the squeeze might be over unless a new catalyst drives another leg up.
The rally requires continued high trading volume. If volume now contracts significantly, it implies fading interest and could cause a pullback for lack of new buyers. Conversely, if volume stays extremely high (hundreds of millions of shares a day), that would signal the squeeze and meme trade is still on, and the price could remain buoyant or even shoot higher. Opendoor needs to remain a "hot" retail story to avoid gravity. Any waning of attention would remove the main support holding the stock aloft.
OPEN is overbought in the short term. Its 14-day RSI hit 90+, which is extremely high, and the stock was about 22% below its new 52-week high of $2.88 after a near-vertical climb. Such moves often retrace partially once the immediate catalysts are past. Traders who got in around $0.50 to $1 may start taking profits. There may also be resistance around $3 (the 52-week high and a round number; $2.50 was also a strike many targeted). Without fresh buying pressure, a pullback to $1 to $1.50 is conceivable in a cooling-off period, which could inflict heavy losses on latecomers or call holders if it happens fast.
Opendoor’s fundamentals do not justify the market cap (about $1.6 billion at $2.25 a share) under normal valuation metrics. The company is still losing money, with a net loss of $368M over the trailing twelve months, a return on equity of about -48%, and slim gross margins (about 8%), and its business model is challenged by high mortgage rates and a cooling housing market. While it is cutting costs, one quarter of positive adjusted EBITDA (guided for Q2) does not equal a full turnaround. If the retail momentum falls, these fundamentals could rapidly be repriced into the stock.
Two Near-Term Events Could Be Pivotal
Shareholder vote on the reverse split (July 28, 2025). If the stock had remained under $1, a reverse split was almost certain to regain listing compliance. Now above $2, the company might choose to forgo or postpone a split. However, the vote was still scheduled, and management could still proceed with, say, a 1-for-10 split to get the price near $20. Avoiding a reverse split could be positive, since there is no dilution effect and no perception of desperation. If traders fear a split going through, there could be some "sell the news" around that date. Or if the company announces the split is off because the stock recovered, that could momentarily cheer investors, though it does not fix fundamentals.
Q2 earnings report (expected August 5, 2025). Opendoor would report earnings in about two weeks, which could inject volatility in either direction. If results or guidance are poor, the stock could rapidly deflate. If results surprise positively, bulls might seize on that to justify some of the optimism, potentially extending the squeeze. In past meme squeezes (GameStop, AMC), earnings often served as a reality check that triggered a pullback, because they remind the market of the real financial condition. Earnings pose a major risk for anyone holding short-dated options through that date: implied volatility is likely to be extremely high going into the event, and a volatility crush could occur after.
Conclusion
The rapid surge in Opendoor Technologies (OPEN) is emblematic of a classic short squeeze, fueled largely by a confluence of retail-driven momentum, social media enthusiasm, and notably elevated short interest. The stock’s rise of nearly 400% from recent lows is not supported by fundamental improvements but by speculative buying pressure, amplified by a hedge-fund endorsement and aggressive call-option trading that triggered a gamma squeeze.
With short interest still elevated around 22% of the float and borrow availability tightening, the stage remained set for continued volatility. The shareholder vote on a possible reverse split and the upcoming earnings announcement could act as catalysts, potentially triggering further volatility or a swift recalibration to more rational valuations.
Ultimately, while the ingredients for an ongoing squeeze remained intact in the near term, investors should closely monitor trading volumes, retail sentiment, short interest levels and borrow costs as critical signals. Opendoor’s rapid rise illustrates the potent combination of market mechanics and trader psychology, but also highlights the risks inherent in speculative, momentum-based investing.
What To Take From This Case
- Crowded shorts are the fuel, not the spark. About 22% of the float was short. That only matters once something forces shorts to cover.
- Volume tells you if it is still on. Hundreds of millions of shares a day signalled a live squeeze. Falling volume signals fading interest.
- Options can amplify the move and then reverse it. Dealer hedging pushed the stock up into expiration, and the unwind can push it down.
- No fundamental support means no floor. Squeezes on weak companies can retrace as fast as they rise.
- Scheduled events are volatility events. Here that was a reverse split vote and earnings.
This article is for educational and informational purposes only. It is not financial advice or a recommendation to buy or sell any security. Short squeeze stocks are extremely volatile and you can lose all of your investment.
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