Kalshi Prediction Market: Growth, Legal Battles, and Youth Risks

Tarek Mansour and Luana Lopes Lara are the co-founders of Kalshi, a prediction market platform that allows users to bet on a wide range of events, from weather forecasts to election outcomes. Founded in 2018, Kalshi has experienced rapid growth, attracting billions of dollars in trades and a significant user base, particularly among younger generations. However, its rise has been accompanied by controversy, legal battles, and a public debate about its nature and potential harms.

The Genesis of Kalshi

Mansour's journey to founding Kalshi was shaped by his upbringing in volatile Lebanon, which instilled in him a probabilistic view of the world. After attending MIT and working as a trader on Wall Street, he observed the anxiety among institutional investors during events like Brexit and the 2016 Trump election, where there was no direct way to bet on specific outcomes. This sparked the idea for Kalshi: a platform where investors could simply buy "yes" or "no" contracts on whether an event would occur.

Kalshi operates as a peer-to-peer platform where every trade is a contract. Users bet "yes" or "no" on an event, and the price of the contract fluctuates based on market sentiment. Kalshi generates revenue by charging a transaction fee on each trade. The name "Kalshi" means "everything" in Arabic, reflecting the founders' ambition to build a financial market accessible to everyone. They believe that with research and effort, users can improve their trading skills.

Lopes Lara, Kalshi's COO, also has an unconventional background, having trained as a ballerina in Brazil before pursuing math and computer science at MIT, where she met Mansour. Their past romantic relationship evolved into a professional partnership, with both prioritizing the company's success.

Regulatory Battles and Election Markets

In 2020, Kalshi achieved a significant milestone by becoming the first federally regulated event contract exchange, approved by the Commodity Futures Trading Commission (CFTC). However, their attempts to expand into election markets were initially blocked by the Biden administration's CFTC, which deemed election betting a form of gaming.

Kalshi responded by suing its own regulator, a move Mansour described as their "only option" and a matter of responsibility, believing they were in the right. In 2024, weeks before the presidential election, Kalshi won its lawsuit against the CFTC, paving the way for election markets. This victory thrust prediction markets into the national conversation, with Kalshi's markets showing Donald Trump with over 60% odds, even as polls indicated a neck-and-neck race. In the weeks surrounding the election, Kalshi processed over $100 million in trades.

Rivalry and Industry Scrutiny

The rapid growth of prediction markets has been largely driven by Kalshi and its rival, Polymarket. A documented hostility exists between Mansour and Polymarket CEO Shane Copeland. Mansour criticizes Polymarket for engaging in markets that "sully the industry," such as those on war or death, which Kalshi avoids in adherence to US regulations. Polymarket, in turn, has accused Kalshi of misleading advertising that harms the industry.

The industry faces scrutiny over insider trading and market manipulation. Federal regulators have reported instances of individuals, such as a White House teleprompter operator and former US Representative George Santos, profiting from insider information on prediction markets. Kalshi banned Santos for life after he bet against his own attendance at the State of the Union while publicly stating he would be there.

Bloomberg reporters Christopher Beam and Denitsa Tsekova highlight the inevitability of such cases due to the incentives involved, noting the increasing difficulty of prosecuting these issues as markets grow. Kalshi asserts it is actively cracking down on insider trading and manipulation, emphasizing that these issues exist in all financial markets and require robust regulation.

The "Gambling" Debate and State Opposition

A central debate surrounding Kalshi is whether it constitutes a financial exchange or a gambling platform. While Kalshi maintains it is a federally regulated exchange, similar to the New York Stock Exchange, opponents argue it functions as a gambling platform that has found a legal loophole. Kalshi's business model, which charges a transaction fee on every trade, incentivizes volume, leading to questions about its financial interest in users betting more, regardless of the outcome for them.

The distinction is crucial, as sports betting is legal in nearly 40 states, but operators pay significant state licenses and taxes, which Kalshi currently avoids. This has led to strong opposition from states and gambling companies. Forty-four states have signed a letter calling prediction markets a "new form of casino," and 20 are engaged in court battles over the applicability of state sports betting laws. The CFTC has responded by suing states, escalating a turf war over regulatory authority.

Mansour argues that Kalshi's structure as an exchange, where customers bet against each other rather than against the platform, differentiates it from sportsbooks. He emphasizes that Kalshi's role is to establish fair rules for the marketplace.

Youth Engagement and Addiction Concerns

Kalshi has aggressively targeted Gen Z through celebrity ads, viral TikToks, and influencer deals. This strategy has raised concerns about young people, particularly those aged 18-21, who are legally allowed to trade on Kalshi but would be too young to enter a casino in most states. In a single year, this age group traded $5 billion on Kalshi.

While some users, like Joseph, claim to profit from specific strategies (e.g., betting on weather temperatures), the data shows that 75% of Kalshi users lose money. Critics argue that Kalshi has a moral obligation to be more transparent about these risks, especially given the prevalence of social media influencers promoting easy money. Mansour counters that Kalshi is transparent about risks, comparing the loss rates to those in day trading, where 95% of retail traders lose money.

Concerns about gambling addiction are significant, with some young people viewing prediction markets as their only chance to make money in an expensive world. Kalshi states it adheres to the 18+ age requirement but would respect a move to 21+ if policymakers decided. Mansour emphasizes the importance of responsible use and welcomes conversations about regulation and safeguards to prevent irresponsible trading.

Elections as the "Holy Grail" and Misinformation Risks

Despite the controversies, Kalshi is doubling down on election markets, viewing them as the "holy grail" that proves the utility and value of prediction markets. For the 2026 midterms, Kalshi aims to be a go-to source for election odds, offering a dashboard that breaks down races by Senate, House, and Governor.

However, critics worry that presenting these betting odds alongside polling data, especially through media partnerships, could confuse viewers and potentially be manipulated to shape public perception. Studies have shown that in smaller races, a relatively small amount of money (a few hundred to a few thousand dollars) can significantly shift a candidate's odds on prediction markets. This raises concerns about the integrity of the vote and the potential for bad actors to spread misinformation.

The involvement of Donald Trump Jr., an investor in Polymarket and a paid advisor to Kalshi, further complicates the regulatory landscape. He received a $300,000 equity stake in Kalshi in 2025, now potentially worth millions. While Trump Jr. reportedly advises on customer engagement and not regulatory matters, his presence highlights the close ties between political figures and this rapidly growing financial instrument.

Kalshi believes prediction markets are here to stay and that the focus should be on educating users and establishing appropriate regulations and safeguards, rather than trying to stop them, which could push activity to unregulated offshore platforms. The ultimate question of who regulates prediction markets may eventually reach the Supreme Court.