We recently reported that Kalshi is exploring an additional capital infusion at a $40 billion valuation, almost double their valuation just six weeks ago (and 20 times their valuation a year ago). The fast-rising valuations are based on numerous strong growth fundamentals, not the least of which is Kalshi’s trading volume leaps. And underpinning that volume growth is Kalshi’s dominance in sports event contracts.
Sports event contracts have driven Kalshi to commanding heights in regulated trading platforms. Data consistently shows these contracts accounting for the overwhelming share of trading activity, frequently topping 80% during active seasons. The surge began after the platform introduced sports markets in January 2025, rapidly elevating overall volumes across major sports leagues and international sporting events.
Explosive Growth During Peak Sports Seasons
Trading volumes spike sharply when major calendars align. During the first four weeks of the 2025 NFL season, sports contracts reached approximately 90% of total activity. NFL markets alone generated $1.13 billion, with college football adding $811 million, for a combined sports total of nearly $2.4 billion — a 296% jump from the previous period. Quite a noticeable bump, with football traditionally being by far the biggest sports betting sport in the U.S.
March Madness windows this year delivered comparable intensity, with sports capturing up to 91% of the audience in the early tournament phases. Even in quieter off-peak stretches, sports maintain around 75% dominance before the next wave of football and basketball seasons arrives. These rhythms highlight how sports contracts power record daily and weekly totals on Kalshi. It’s an enormous part of their current volume, even as they are rapidly looking to expand into other sectors, including institutional trading.
Kalshi Trading Volume Breakdown by Category
| Period | Sports Share | Notes on Combined Activity |
|---|---|---|
| Trailing 30 days ending May 2026 | ~61% pure sports | Exotics/parlays add ~26%, lifting sports-linked total to ~87% |
| NFL season starts in September 2025 | ~90% | NFL ~42%; college football ~30% |
| Since July 2024 | 80% | Consistent long-term leadership |
Trading Mechanics Set Kalshi Apart from Sportsbooks
Kalshi operates its sports event contracts under federal commodities regulations as a CFTC-registered Designated Contract Market. Each contract functions as a binary instrument that settles at $1 or $0 based on the outcome of real-world events.
Several operational differences distinguish the model from traditional sportsbooks. The aforementioned peer-to-peer market trading, where traders buy and sell positions with one another, rather than competing against a house with fixed odds and a vig (a built-in profit margin for the sportsbook). In this manner, market prices are set by supply and demand, through buying and selling, rather than being fixed by a bookmaker. Open order books mean that traders can continue to change their positions throughout the market period until the event resolves. This is not like placing a bet; this is staking a position in a constantly changing market.
Additionally, the Kalshi platform only requires users to be 18 years or older in permitted areas, maintains real-time surveillance, enforces anti-money laundering rules, and prohibits insider trading to meet CFTC standards.
State regulators often view these instruments as functionally similar to conventional sports wagers on wins, spreads, and props. Ongoing court battles are raging over whether the Commodity Exchange Act protections fully shield the contracts from state gambling oversight. Federal preemption arguments continue testing these boundaries in multiple jurisdictions. The matter is far from settled. But even as that occurs, Kalshi remains active and available across most of the country.
Regulatory Tensions Escalate Over Sports Contracts
Legal challenges have intensified as volumes climb. In prominent cases, federal courts have supported preemption claims in early rulings, though appeals remain active. CFTC officials review self-certified contracts and have the authority to intervene on public-interest grounds. The CFTC maintains that these sports-event contracts, while they do limit non-data-based contracts (e.g., proposition bets on non-game elements), are swaps as defined under the federal CEA, like other commodities contracts it supervises.
Traditional sports betting stakeholders point to competitive imbalances. State-licensed operators pay local taxes and follow jurisdiction-specific responsible gaming rules, while federal derivatives status creates friction as Kalshi scales. Ultimately, this battle remains in legal limbo, with the amounts of money at stake, which tend to drive these cases for years. Though many expect the Supreme Court to ultimately resolve key components of this federal-versus-state authority matter.
Trader Activity and Market Implications
The heavy focus on sports has accelerated Kalshi’s expansion since early 2025. Daily volumes frequently hit hundreds of millions during busy periods across football, basketball, baseball, and global competitions. Crypto and political contracts provide secondary volume but rarely challenge sports intensity outside exceptional news and election cycles.
Sports market traders rotate attention across seasons, maintaining engagement year-round. Golf and niche categories, as well as futures bets on upcoming seasons, sustain smaller yet steady flows even in periods when major sports leagues aren’t active. This rotation, paired with continuous trading, keeps the platform sports markets hopping even as percentages fluctuate with the calendar.
References
- Pew Research Center report on surging volumes
- Sportico NFL season volume analysis
- Next Event Horizon Substack on sports share
- Kalshi official FAQ
- YouTube video on multibillion-dollar expansion
- CFTC sports contract filing example
- Third Circuit Court preemption opinion
- DeFi Rate Kalshi volume analytics
- CoinDesk U.S. market share report
- Stinson Law publication on legal tensions
The PolyPunter staff works tirelessly to bring you the latest and most insightful news, information, and tips on the fast-growing economic, financial, and social phenomenon that is prediction markets.
