Startup Trends: Kalshi and Polymarket among the $48 billion prediction market category
Event-based trading markets are no longer a niche corner of finance. These platforms allow participants to trade contracts tied to elections, sporting events, economic indicators, commodity prices and other real-world outcomes, transforming collective market views into continuously updating probabilities.
The category’s rapid growth is attracting users, institutional investors and private market capital. Industry analysts project that the category could reach $1 trillion in annual trading volume by 2030, while Kalshi reported in May that its own annualized trading volume had more than tripled in six months, rising from $52 billion to $178 billion.1,2 Another measure of the sector’s momentum is evidenced in each company’s Forge PriceTM. As of this publication, Kalshi and Polymarket now have a combined implied valuation of approximately $48.58 billion.
As the category expands, investors are paying closer attention to the differing strategies of Kalshi and Polymarket. Both companies give users a way to express a view on the future, but they have built their businesses through different market structures. Kalshi operates as a federally regulated exchange in the United States, while Polymarket rose to prominence as a blockchain-powered platform with a global user base.3,4 Their latest expansion and fundraising efforts suggest that both private companies are looking to potentially grow their marketshare.
Kalshi: Leading the valuation race and looking abroad
Headquartered in New York, Kalshi was founded in 2018 by Tarek Mansour and Luana Lopes Lara. The company operates a Commodity Futures Trading Commission-regulated exchange where users buy and sell event contracts whose prices reflect the market’s estimated probability of an outcome. Its markets span sports, politics, economics, weather, culture and other measurable events.5
Kalshi so far has the highest valuation of the two firms within the category. As of September 2, 2026, its Forge PriceTM is $962.28, implying a valuation of $35 billion. The increase is significant. In April, Kalshi's Forge PriceTM of $604.86 corresponded to a Forge Price Valuation of $22 billion.6
The rise follows a $1 billion Series F announced in May at a $22 billion valuation. Coatue led the round, with participation from Sequoia Capital, Andreessen Horowitz, IVP, Paradigm, Morgan Stanley and ARK Invest. Kalshi said institutional trading volume had increased 800% over the preceding six months and that the new capital would help it expand adoption among hedge funds, asset managers, proprietary trading firms and insurance companies.7
Kalshi is also laying the groundwork for international growth. In August, the company partnered with brokerage infrastructure provider Alpaca to make Kalshi event contracts available through financial institutions outside the United States, subject to regulatory approval in each market. Alpaca supports more than 300 financial institutions and 14 million brokerage accounts globally, giving Kalshi a potentially faster path to new customers without having to build every distribution relationship from the ground up.8 The partnership follows a June agreement with Canadian financial platform Wealthsimple and signals that Kalshi sees its addressable market extending well beyond the United States.9
At the same time, Kalshi is broadening its ambitions beyond event contracts. The company has sought regulatory approval to expand perpetual futures – that is, derivatives without an expiration date – from crypto into metals, foreign exchange and energy, with possible future products tied to indexes and individual stocks. If approved that strategy could position Kalshi not only against other prediction platforms, but also alongside established derivatives exchanges.10
The company's growth has increased investor interest in a potential initial public offering. Mansour said in June that Kalshi was beginning to think about going public, though he indicated an IPO would not occur in 2026. Reports have pointed to late 2027 or early 2028 as a possible window, but the company has not announced a firm timetable or filed publicly for an offering.11
Polymarket: A potential $1 billion raise at a $21 billion valuation
New York City-based Polymarket was founded in 2020 by Shayne Coplan. Built on blockchain infrastructure, its platform allows users to trade on the outcomes of real-world events using stablecoins. Polymarket gained widespread attention during the 2024 U.S. presidential election, when its real-time probabilities were widely cited as an alternative signal to traditional polling.12
As of September 2, 2026, Polymarket’s Forge PriceTM is $137.70, implying a valuation of $13.58 billion. While that trails Kalshi, Polymarket continues to attract its own private capital. The company is reportedly raising $1 billion in a round led by 1789 Capital that would value it at $21 billion. 1789 Capital is expected to invest approximately $300 million as part of the round.13
The reported financing would mark another major step up for Polymarket. In April, the company was reportedly discussing a $400 million raise at a valuation of as much as $15 billion. If completed, the proposed round would more than double the capital raised while increasing the company's valuation by approximately 40%.14
Polymarket has also secured support from established financial and venture investors. Notable backers include Intercontinental Exchange (ICE), the parent company of the New York Stock Exchange, along with Founders Fund, General Catalyst, ParaFi and 1789 Capital. ICE’s investment and ownership position is particularly notable because it connects a blockchain-native prediction platform with one of the world’s largest operators of regulated exchanges.
Unlike Kalshi, Polymarket has not publicly established a potential IPO timeline, and no public filing has been reported as of this article’s publication. Its proposed $1 billion private financing suggests that the company currently has access to substantial growth capital without entering the public markets. Still, a successful round at a $21 billion valuation could strengthen its financial position, support further product and geographic expansion, and give investors a new benchmark against which to assess any future public-market ambitions.
Investor takeaway
Kalshi and Polymarket are helping establish event-driven trading as a distinct financial category, but their growth is occurring alongside an unsettled regulatory debate. Supporters view event contracts as tools for forecasting and hedging risk, while critics argue that some contracts, particularly those tied to sports, resemble gambling and should be regulated at the state level. Recent litigation has produced differing legal outcomes, leaving questions over federal and state authority unresolved.15
For private market investors, that tension is part of the potential opportunity and the risk. Kalshi’s international distribution push and expanding product set could broaden its reach beyond U.S. event trading, while Polymarket’s proposed $1 billion raise could provide significant capital to compete at a global scale. Together, their nearly $49 billion in combined Forge-implied valuation illustrates how quickly prediction markets have grown from an emerging concept into a private market category that may be worth watching. Whether either company ultimately reaches the public markets may depend as much on regulatory clarity as on continued user adoption and the ability to operate compliant marketplaces at scale.
