Underdog Aristotle Lawsuit: The $850M Carve-Out Explained

Buried on page six of IG Group’s takeover announcement sits the sentence that produced a fraud complaint in Delaware: the $850 million management incentive plan “does not form part of the consideration payable to the selling shareholders.” The Underdog Aristotle lawsuit, filed in the Delaware Court of Chancery on August 12, turns on those twelve words.

The short version: Underdog bought the CFTC licences that let it run its own prediction market exchange from Aristotle in March, launched that exchange in July, and agreed to sell itself to London-listed IG Group less than two weeks later. Aristotle, which took Underdog equity as part of the March deal, now says the takeover was structured so that a large slice of IG’s money bypasses shareholders like itself. It is the sharpest corporate fight yet to come out of the industry-wide scramble from sportsbooks toward prediction markets.

What Aristotle Actually Filed

Two Aristotle entities — Aristotle Exchange Holding Company 1, Inc. and Aristotle International, Inc. — brought the case on August 12. The defendants include Underdog Sports Holdings, chief executive Jeremy Levine, co-founder Brandon Stakenborg and IG Group Holdings itself, according to Sportico. The complaint was initially filed under seal and unsealed on August 18, according to Bloomberg Law.

Bloomberg Law, which reviewed the unsealed filing, reports that Aristotle accuses Underdog executives of duping it into a complex merger before engineering a separate sale of the combined company that would direct hundreds of millions of dollars to insiders — a transaction the complaint describes as “the consummation of a year-long fraud.” Central to the suit is the $850 million management incentive plan attached to IG’s takeover: Aristotle argues that potential payout should have been spread across all investors rather than reserved for employees. These are allegations in a civil complaint; Underdog denies them, and no court has ruled on any of the claims.

Levine disclosed the suit himself the following day, in a post on X reported by Gambling Insider, describing it as Underdog’s first time being sued and listing claims “like ‘fraud’, ‘scheme’, ‘conspiracy’, etc.” He went on:

“Apparently the Aristotle folks are unhappy with the money they’re making from the sale of their licenses, even though they will end up making more than anyone else in our sale to IG.”

— Jeremy Levine, Co-Founder and CEO of Underdog, on X (August 13, 2026), as reported by Gambling Insider

In the same thread, Levine claimed Aristotle had demanded extra payment as a condition of signing off on the IG transaction and predicted the case would prove to be nothing but noise. Aristotle has declined to comment beyond the filing itself.

The $850 Million Question

To see why the fight centres on the management incentive plan, you have to look at how IG structured the deal. The headline number is “up to approximately $1.3 billion” — an enterprise value of roughly $1.1 billion upfront plus an earnout of up to $200 million. But IG’s own announcement, filed with the London market on July 30, is explicit about what sits outside that number:

“Separately, a MIP will be established for eligible Underdog employees which does not form part of the consideration payable to the selling shareholders.”

— IG Group, acquisition announcement (RNS), July 30, 2026

That plan is capped at $850 million. Add it to the shareholder consideration and the roughly $160 million of Underdog debt IG will repay, and IG’s maximum total outlay reaches about $2.15 billion — of which the selling shareholders, Aristotle among them, receive at most around $1.16 billion. Whether that $850 million is genuinely contingent performance pay, or deal value carved away from the people who owned the company, is in essence what a Delaware judge is being asked to decide.

The plan is not free money, and IG has never presented it as such. It is geared entirely to profit targets — and, as the filing puts it, “self-funded from Underdog’s earnings.” But that is precisely the design choice Aristotle is attacking: a pool worth up to 39% of IG’s total potential outlay that flows to eligible employees rather than through the shareholder register.

Why the Founders Are Named

The complaint does not target Underdog alone. Naming Levine and Stakenborg personally makes more sense once you notice where the two founders sit in the deal’s architecture — on both sides of the line Aristotle is contesting.

As selling shareholders, the founders will together receive IG shares equal to roughly 1.5% of the enlarged group’s capital, vesting under lock-up restrictions that release in stages between nine and 24 months after completion. As employees, they also stand on the receiving end of the incentive plan: IG’s announcement specifies that the founders will have 50% of any 2029 MIP payout settled in IG shares rather than cash. Every dollar that reaches the MIP rather than the purchase price is a dollar allocated to the employee pool — the pool Aristotle, as a pure shareholder, has no access to. That structural observation is the heart of the complaint’s “siphoning” theory as Bloomberg Law describes it — and it is an allegation, not a finding; Underdog rejects it, and the deal terms themselves were disclosed openly in IG’s regulatory announcement.

What Were the Licences Worth?

Underneath the deal-structure fight is a simpler grievance: Aristotle sold its exchange and clearinghouse months before the market repriced what such licences are worth. A DCM and DCO pairing takes years to obtain from the CFTC — Gemini waited five years for its approval — which is why operators racing into prediction markets have preferred to buy licence holders outright.

The two disclosed comparables bracket the market. Polymarket paid $112 million for QCEX, a licensed exchange and clearinghouse, in July 2025. DraftKings’ purchase of Railbird — the licence behind its DKeX exchange — cost $48.6 million upfront with up to $200 million more tied to performance, per DraftKings’ SEC filing. What Underdog paid Aristotle has never been disclosed; Aristotle took Underdog equity as at least part of the price, according to Gambling Insider.

The licences did their job almost immediately. UDX launched on July 18, and by the time of IG’s announcement — which leans heavily on what it calls a “valuable, vertically integrated licence stack” spanning brokerage, exchange and clearing — Underdog ranked as the third-largest US prediction markets venue by regulated notional volume, behind Kalshi and Robinhood. Twelve days after launch, IG agreed to buy the whole company.

The Bar Underdog Has to Clear

Whether the $850 million ever gets paid is a separate question from who should be entitled to it. The plan’s thresholds are demanding. Underdog’s net revenue was roughly $466 million in the twelve months to June 2026, with EBITDA of about $46 million in the second quarter — the company only turned EBITDA-positive this year. The full MIP requires EBITDA of at least $400 million in 2028 and $700 million in 2029.

The structure explains why IG describes the plan as performance pay: the richest tier delivers $2.00 per $1 of EBITDA only in the final band between $600 million and $700 million. If Underdog merely keeps growing at its current pace, most of the plan never pays out — which is exactly IG’s argument for why it is incentive compensation rather than hidden purchase price.

Does This Threaten the Deal?

Nothing made public so far suggests the timetable has moved. Completion still depends on US regulatory approvals and clearance under the Hart-Scott-Rodino Act, with IG guiding to late 2026 or early 2027 — a deal done federally, under the CFTC’s umbrella, even as the fight over sports prediction market rules rumbles on in the background. IG Group has not commented publicly on the lawsuit.

The market’s verdict on the acquisition itself has been rockier. IG shares fell 10.7% the morning after the announcement, and the group paused its £125 million buyback with about £33 million executed, according to Proactive Investors — even as broker Jefferies wrote, in a note reported by the same outlet, that “the acquisition is interesting, and we suspect it will play well with investors.”

For Underdog, the irony is hard to miss. The company spent recent years fighting state regulators over its fantasy products, pivoted into federally regulated prediction markets, bought its independence from its old exchange partner Crypto.com by acquiring Aristotle’s licences — and now faces its most serious legal threat not from a gaming regulator, but from the company that sold it the keys.

FAQs

Sources

• Proposed acquisition of Underdog (RNS announcement) — IG Group
• Underdog Launches Prediction Markets on its own Exchange — Underdog Sports
• Underdog Acquires CFTC-Registered DCM and DCO (press release) — Underdog, via Yahoo Finance
• Aristotle Receives CFTC Approval for DCM and DCO — Aristotle, via GlobeNewswire
• Willkie Attorneys Advise Aristotle Exchange on Acquisition by Underdog — Willkie Farr & Gallagher
• DraftKings Inc. Form 10-Q, Q3 2025 (Railbird acquisition terms) — US Securities and Exchange Commission
• Polymarket Acquires CFTC-Licensed Exchange and Clearinghouse QCEX for $112 Million — Polymarket, via PR Newswire
• IG Group’s $1.3 Billion Underdog Sports Deal Challenged in Court — Bloomberg Law
• Underdog Sued by Aristotle Over IG Group Takeover Terms — Sportico
• Kalshi, CFTC State Lawsuits Drive Prediction Market News This Week — Gambling Insider
• IG tumbles as investors react to $1.3bn Underdog deal — Proactive Investors