Largest iGaming Operators: How the Biggest Online Gambling Companies Are Built

The biggest online gambling operators are big in different ways. Some are collections of brands across dozens of markets; some are one brand that dominates one country; some are American businesses born in the last decade; some are private companies that publish nothing; and some run outside the regulated world entirely. This guide explains how each type got large, what scale buys, how to measure size without being misled, and where the ranking is heading.

Measuring size honestly

Four measures are used and they rank operators differently.

Revenue (net gaming revenue or, in US reporting, revenue after promotions) is the most comparable, and it is only available for listed companies and those that publish accounts. Handle or stakes flatters sportsbooks over casinos, since sports betting recycles money at low margins. Active customers flatters low-value markets. Market capitalisation measures what investors think the future is worth, not what the business is today, and it changes daily.

Two further problems: reporting periods and definitions differ (some deduct bonuses, some do not), and the private companies (bet365 above all) are estimated rather than known. Any list that gives precise figures for private operators is guessing. This guide describes scale in words for that reason and points to the iGT 25 for the live listed numbers.

The multi-brand international groups

The archetype is a group that grew by acquisition into a portfolio of brands, each with its own market, running on shared technology, compliance and marketing.

Flutter Entertainment is the largest: FanDuel in the US, Paddy Power and Betfair in the UK and Ireland, Sportsbet in Australia, PokerStars globally, Sisal in Italy, Snai (acquired 2025), Junglee in India and more. It was built through the Paddy Power and Betfair merger, the acquisition of The Stars Group, and the FanDuel investment that became the US market leader. Its scale gives it a technology platform amortised across markets, purchasing power with suppliers and media, and the ability to enter a new market with a known brand and a proven playbook.

Entain (Ladbrokes, Coral, bwin, partypoker, Eurobet, Ninja Casino, and half of BetMGM) grew through GVC's acquisitions of bwin.party and Ladbrokes Coral. Kindred (Unibet, 32Red, Maria) was acquired by FDJ United, making the French lottery operator a pan-European online group. Betsson runs a dozen brands from Stockholm across the Nordics, Europe and Latin America. evoke (888, William Hill, Mr Green) is the combination of 888 and William Hill's international business. Super Group (Betway, Spin) and LeoVegas (owned by MGM Resorts) complete the tier.

The US-focused operators

The United States opened state by state from 2018, and the operators that won it are of a different kind: born or reborn for one very large market, funded by public markets, and built on customer acquisition at a scale Europe never saw.

FanDuel (Flutter) and DraftKings lead, with a combined share of US online sports betting that has stayed above half. Both grew from daily fantasy sports, which gave them customer databases and brands before sports betting was legal. BetMGM (Entain and MGM), Caesars, Fanatics (which bought PointsBet's US business and grew from sports merchandise), bet365 (entering state by state) and Hard Rock Bet (from the Seminole Tribe's Florida compact and expanding) form the second tier. Rush Street Interactive (BetRivers) and Penn Entertainment (ESPN Bet, after Barstool) are listed and smaller.

US iGaming (online casino) is legal in only seven states and is where the profit is concentrated; the operators with strong casino products in New Jersey, Pennsylvania and Michigan earn most of the market's margin.

National champions

In many countries the largest operator is a domestic brand with a dominant share of one market, often with roots in retail betting, lottery or a state monopoly.

bet365 is the extreme case: a British private company that became the world's largest online sportsbook from one brand, one platform and one city, expanding country by country without acquisitions. Sky Betting and Gaming (Flutter) dominates a segment of the UK. Tipico in Germany, Betano (Kaizen Gaming) in Greece, Portugal, Romania and Brazil, Lottomatica and Sisal in Italy, Codere in Spain and Latin America, Sportsbet and Tabcorp in Australia, Betclic in France, Superbet in Romania and Poland, and the state-linked operators (Svenska Spel, Norsk Tipping, Veikkaus, Loto-Québec, OPAP before Allwyn) hold their markets by brand, distribution and, in some cases, law.

The private giants

bet365 is the largest, and the reason every ranking carries an asterisk. Others: Kaizen Gaming, Tipico, Betfred, Novibet, Betsson's peers in the Nordic private sector, and the large Asian-facing groups that serve markets across East and Southeast Asia from licences in the Philippines, Curaçao and elsewhere and whose scale is estimated only from the size of the sponsorships they buy.

The crypto-first operators

Stake and its peers accept crypto, serve customers largely in markets without local licensing, hold licences from Curaçao and similar jurisdictions, and report volumes that would place them among the largest operators in the world if they were comparable. They sponsor football clubs and Formula One teams at the level the listed groups do, which is the clearest public evidence of their scale. Their regulatory position is the subject of the crypto gambling guide.

What scale buys

Scale in online gambling is worth having for reasons that compound:

• Fixed cost leverage. Platform, compliance, licensing and technology cost roughly the same whether an operator has one million customers or ten; the larger operator spreads them.
• Marketing efficiency. Brand awareness reduces acquisition cost; media and sponsorship are bought at scale; a multi-brand group can segment a market.
• Supplier terms. Content on revenue share, data feeds and payments all cost less per unit for the largest buyers.
• Regulatory capacity. Entering a new market, running a licence application and absorbing a regulatory settlement are affordable at scale and existential for a small operator.
• Product. The largest operators build their own sportsbooks, platforms and studios, keeping margin and controlling the roadmap.

Against that: scale attracts regulators (the largest fines have gone to the largest operators), advertising restrictions bite hardest on the brands that bought most, and a multi-brand group carries integration and complexity costs. The last decade's story has been consolidation; the next decade's question is whether the largest operators can keep growing as markets mature and regulation tightens.

Scale also changes an operator's relationship with regulators and governments. The largest licensees are consulted on rule changes, sit on industry bodies, fund research and treatment levies at amounts that shape policy, and are the first to be made examples of when enforcement is needed. A small operator is a licensee; a large one is a stakeholder, with the access and the exposure that brings.

Where the ranking is heading

Three forces: the US market maturing into a two- or three-operator oligopoly with a profitable second tier; Latin America (Brazil above all) producing new scale for the groups that win it; and prediction markets, which are not counted as operators and compete with them. Add continued consolidation in Europe and the periodic possibility of one of the private giants listing, and the ranking in five years will differ from today's more than today's differs from five years ago.

Frequently asked questions

Who is the largest online gambling operator? Among listed companies, Flutter Entertainment by revenue. Privately held bet365 is comparable and may be larger on some measures.

Who leads US online gambling? FanDuel and DraftKings, with a combined majority of online sports betting; the casino states are where the profit sits.

Why do lists disagree? Different measures (revenue, handle, customers, market value), different periods, different definitions, and estimates for private companies.

Are crypto casinos among the largest operators? By volume, several would be; they are not comparable on reported revenue and operate mostly outside licensed markets.

Where are the live numbers? The iGT 25 index page for listed operators, and company filings.

Related on iGaming Times

Top iGaming Companies 2026 maps every layer of the industry; How iGaming Companies Make Money explains the economics behind the scale; iGaming M&A 2026 follows the consolidation; and the Markets page tracks the listed operators daily.

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Regulation, tax and market figures move quickly, sometimes mid-year. Where this guide gives a number, treat it as a starting point and confirm the current position with the named primary source before you rely on it.