Image credit: Source: operator product pages and American Gaming Association industry data. Never imply stock depicts the actual event.
Same-game parlays now generate an estimated 35 to 40% of gross gaming revenue at major US sportsbooks, up from under 20% in 2021, and they carry a house edge that can exceed 35% against roughly 4.5% on a straight point spread. That single product shift, more than any marketing budget or state launch, explains why the American betting industry keeps a bigger share of every wagered dollar than it did five years ago.
The blended hold across US sportsbooks rose from about 7.0% in 2019 to 10.2% in 2025, according to figures the American Gaming Association presented in its State of the Industry review and reported by trade coverage of the shift. Applied to a 2025 handle of roughly 167 billion dollars, that difference is worth several billion dollars a year in revenue operators keep rather than pay back to winners. The mechanism is the same-game parlay.
Why same-game parlays changed the sportsbook business
A same-game parlay combines several outcomes from one event into a single wager: a team to win, a quarterback to throw for a set yardage, a receiver to score, all on one ticket that pays only if every leg lands. FanDuel filed its trademark in July 2019 and launched that November; Caesars and DraftKings followed at the start of the 2021 NFL season. Within four years it moved from novelty to the center of the business.
The reason is margin. A single point-spread bet holds around 4.5%. String five correlated legs together and the compounded pricing, plus the book's correlation adjustments, pushes the effective house edge past 35%. The bettor sees one big payout; the operator sees the highest-margin product on a regulated app.
Straight betting is a near-efficient market where sharp customers grind the book on price and get limited. Parlay betting is a lottery-style product where the customer buys a story and pays a premium for the dream. Operators far prefer the second, and their entire interface now nudges toward it.
The product, not the promotion, is the moat
The industry narrative for years was that customer acquisition won the US market: whoever spent hardest on sign-up bonuses and TV advertising in the post-2018 land grab would own the customer. That is now half true at best. Acquisition got FanDuel and DraftKings to scale; the parlay makes that scale profitable.
This is a product-and-pricing advantage that compounds. Building an engine that prices thousands of correlated leg combinations in real time, adjusts for the fact that a quarterback's passing yards and his top receiver's catches are not independent events, and stays fast enough to keep a live in-play menu current is genuinely hard. It requires proprietary models, low-latency data, and years of settled bets to calibrate against, closer to the game-content and pricing moats that separate iGaming suppliers than to a marketing spend anyone can match.
That is why the same-game parlay sits at the heart of the wider sportsbook product race. The next frontier, micro-betting on the next pitch or play, is parlay logic applied to ever-smaller units of a game. Operators that own their pricing engine can extend into micro-markets; those licensing a platform always price a step behind.
FanDuel and DraftKings understood this earliest and built in-house. Massachusetts reporting through 2026 has shown both holding well above the market average, a direct read on how much of their handle flows through parlays. The gap between the two leaders and the chasing pack, BetMGM, ESPN Bet, Fanatics, Caesars, is not mainly one of brand awareness. It is how efficiently each book converts handle into revenue.
The pricing engine is the hard part
The difficulty is not offering a parlay. Any book can multiply odds together. It is pricing correlated legs without leaving money on the table or handing sharp bettors an edge, and the market leaders spend heavily on models that estimate those correlations and adjust the payout down, which is where much of the margin is manufactured. Industry analysis puts the built-in hold at roughly 15 to 20% once a parlay reaches five legs. Progressive-parlay formats, which still return something even if one leg misses, add another pricing layer. The menu is engineered so the highest-payout options are the most profitable.
Transparency has become a competitive variable of its own. FanDuel displays each leg's odds and pioneered the cross-game format that lets bettors combine selections from different games, betting that showing the price builds trust and repeat play. DraftKings runs the highest-volume builder in the US but shows only the combined payout. Both choices are deliberate, and both keep the parlay mix, and with it the hold, climbing.
What the margin shift means for each audience
For operators, the strategic read is blunt: the parlay mix is the single most important lever on gross margin. Every design decision, from the one-tap builder to the "add another leg" prompt to the cash-out button, exists to push more handle into high-hold combinations.
For regulators and the states that tax this activity, the parlay is a live policy question. Higher hold means more taxable revenue, which is why state coffers have grown even where handle growth has slowed. It also means bettors lose a larger share of what they stake. As several states move to raise betting taxes on operator revenue, the parlay-driven margin expansion is what makes those books look profitable enough to tax harder. Operators cannot argue they are barely breaking even while reporting record hold.
For bettors, the honest framing is the one the industry avoids. A same-game parlay is a high-cost, low-probability product. The occasional viral five-figure payout on a small stake is real, and it is also the marketing engine that sells the next ten thousand losing tickets. The same 20 dollars staked on straight bets faces a 4.5% expected cost; on a five-leg parlay it faces an edge above 35%. Most bettors do not do that math, and the product is designed so they do not have to.
The parlay has not peaked
The parlay is not a fad that peaked. Its share of revenue is still climbing, and the roadmap points toward more correlation, more legs, and faster settlement. Three developments are worth watching.
First, in-play and micro-betting will fuse with the parlay. Live same-game parlays that update leg by leg turn a single event into a rolling series of high-margin decisions. Operators with the best real-time pricing will extend their lead, and the data-rights deals that feed those engines will get more contested, as the fight over sports data exclusivity already shows.
Second, the transparency question will sharpen. As consumer-protection scrutiny grows, regulators may start asking operators to disclose the effective hold on parlays the way some jurisdictions require return-to-player disclosure on slots. That threatens the margin, because the product depends in part on the customer not seeing the price.
Third, the competitive frame is widening. Prediction markets are entering sports betting with exchange-style contracts at low margins rather than book-set parlay odds at high ones. If they gain traction with price-sensitive bettors, they attack the sportsbook exactly where it is most profitable and least defensible: the gap between what a parlay costs and what it is worth.
The same-game parlay built the modern US sportsbook's margin. The next five years will test whether it survives regulators who want a bigger cut and competitors who will undercut the price. For now, the product that started as a 2019 gimmick is the most valuable asset most sportsbooks own.
Related coverage: The micro-betting product race, US betting-tax escalation and operator economics, prediction markets as a sportsbook rival, and the sports-data exclusivity debate.