Can Prediction Markets Forecast the Next Horror Box Office Hit?

A horror movie can have millions of fans online and still leave Hollywood guessing about ticket sales. Prediction markets put money behind those guesses, but are traders any better at spotting a hit before the first screening even begins?

Horror fans love a surprise, but Hollywood doesn’t always appreciate one. Every year, studios spend serious money trying to work out which movies will bring audiences into theaters. Then along comes a horror film that nobody expected to do particularly well, and suddenly everyone is asking how they got it so wrong. With prediction markets now taking bets on movie earnings, there’s another group trying to call the next big hit. The question is whether they’re any better at it.

Backrooms Wasn’t Supposed to Open This Big

Backrooms had an unusual advantage before it reached theaters. Director Kane Parsons had already built an audience through his YouTube horror videos, turning the idea of endless, empty rooms into something that frightened millions of viewers. A24 was bringing that internet phenomenon to cinemas, but nobody knew exactly how many online fans would buy tickets.

The early numbers were encouraging without suggesting a blockbuster. The long-range forecast put its domestic opening weekend between $20 million and $30 million.

Then Backrooms opened to $81.4 million.

That’s $51.4 million above the upper end of the forecast. Even allowing for the uncertainty involved in predicting ticket sales several weeks ahead, the difference was enormous.

Horror has a particular problem here. A film can build an enthusiastic following online without anyone knowing whether that enthusiasm will translate into ticket purchases. People watching a creepy video on YouTube aren’t necessarily planning a Friday-night cinema trip.

Backrooms demonstrated that the audience was considerably larger than the advance forecast suggested. The interesting question is whether another method could have recognized that demand sooner.

There is an interesting twist: Polymarket also hosted contracts on Backrooms’ opening weekend. One market opened on May 28, just before the film’s wide release, and allowed traders to predict whether domestic earnings would exceed $79 million or fall into lower ranges.

The market ultimately recorded approximately $631,000 in trading volume, with the above-$79-million outcome resolving successfully. That is a notable contrast with the $20 million to $30 million long-range forecast published earlier in May.

However, the comparison needs context. The market launched only shortly before release, when substantially more information was available. Its final winning outcome does not reveal exactly how accurately traders predicted the result before opening-night ticket sales became known.

Prediction Markets Put a Price on Expectations

Prediction markets approach forecasting differently. Instead of asking an analyst to estimate a film’s earnings, they allow traders to buy contracts based on what they believe will happen.

Imagine a contract asking whether an upcoming horror movie will earn more than $50 million during its opening weekend. A Yes contract trading at 30 cents suggests that traders collectively assign roughly a 30% chance to that outcome, although the price can also reflect trading conditions.

You can buy a position when you believe the market has underestimated a film. Someone expecting disappointing ticket sales might take the opposite side. Contracts typically settle at $1 when the predicted outcome occurs and $0 when it doesn’t.

The interesting part is what happens before the film opens.

A trailer might attract considerably more attention than expected. Advance ticket sales could suggest stronger demand, while disappointing early reactions might discourage traders. Each development gives participants another reason to reconsider their positions, and prices can change as they trade.

Polymarket offers a practical example of this approach, with prediction contracts covering movie earnings, entertainment awards and other real-world events. The platform has hosted opening-weekend markets for films including Backrooms and Obsession, allowing participants to trade on different box office outcomes. For eligible new users interested in exploring the platform, the Polymarket welcome offer detailed by Covers currently provides $25 in bonus trading credit after a qualifying $10 deposit. Availability and promotional conditions depend on the applicable platform and jurisdiction.

There is an important difference between a forecast published weeks before release and a contract that continues trading as opening night approaches. The latter can incorporate information that wasn’t available when the original prediction was made.

That makes prediction markets worth watching, particularly when a horror release attracts attention that traditional audience tracking struggles to measure.

A Crowd Forecast Still Needs to Be Right

Of course, allowing people to trade on predictions doesn’t guarantee that their collective judgment will be accurate. Traders can misunderstand information, follow popular opinions or become overly enthusiastic about something they personally enjoy.

A 2026 study comparing prediction markets with expert surveys examined 103 scientific findings and produced 206 forecasts. The average absolute error was 0.384 for prediction markets and 0.423 for expert surveys, although the difference was not statistically significant.

Those findings concern scientific research rather than movie ticket sales, so they cannot establish which approach works better in Hollywood.

They do illustrate an important point: prediction markets have to earn their reputation through accurate results. A contract price tells you what traders currently believe, but the actual outcome determines whether they were right.

Obsession Proved Opening Weekend Isn’t Everything

Obsession presents another challenge for anyone trying to forecast horror success. The film opened to approximately $17.2 million domestically in May 2026, then earned $23.96 million during its second weekend, an increase of 39.3%.

The film continued growing in its third weekend, reaching $27.4 million. That is a remarkable pattern for a theatrical release, where ticket sales typically decline after opening weekend.

Audience reception was a significant part of the story. According to Rotten Tomatoes, Obsession currently holds a 93% critics’ score and a 94% verified audience score from more than 10,000 ratings. The positive response provides useful context for its sustained theatrical performance.

The film also attracted actual prediction market activity. Polymarket’s Obsession opening-weekend market generated approximately $213,800 in trading volume, with contracts covering different domestic opening-weekend earnings ranges.

The winning outcome was an opening above $15 million, consistent with the film’s final $17.2 million debut. However, the market opened on May 12, only three days before the theatrical release, so its final result cannot tell us how accurately traders would have predicted the film’s longer-term success weeks earlier.

That distinction is particularly important for horror. A strong opening weekend is only one part of the commercial picture. Positive reviews, audience recommendations and repeat interest can influence ticket sales after a film has already reached theaters.

Prediction markets may incorporate those developments into new forecasts, but predicting a film’s initial debut and anticipating an unexpectedly successful theatrical run are two different challenges.

Can Prediction Markets Really Predict the Next Horror Hit?

Prediction markets offer another way to assess upcoming horror releases, particularly when conventional forecasts and audience expectations disagree. Their biggest advantage is flexibility: prices can respond to new trailers, ticket presales, reviews and early box office reports.

Backrooms provides an interesting example. Its $81.4 million domestic opening exceeded an early professional forecast by a considerable margin, while a prediction market launched shortly before release included contracts covering earnings above $79 million.

Obsession tells a different story. Its opening-weekend market correctly resolved above $15 million, but the film’s biggest surprise came later, when its second and third weekends outperformed its debut.

These examples demonstrate that prediction markets can offer useful information, but they do not establish that traders consistently outperform professional box office analysts. To make that claim, we would need to compare forecasts made at similar times, across a substantial number of films, using the same measures of accuracy.

So, can prediction markets forecast the next horror box office hit? They can assign probabilities to specific outcomes and adjust those expectations as new information emerges. Whether they can reliably identify surprise successes before the wider industry recognizes them remains an open question.

And in a genre built around the unexpected, that question is unlikely to lose its appeal.