In re Tether & Bitfinex: Billions Mass Tort

A long-running class action alleging that Tether and Bitfinex manipulated crypto markets in 2017–2019 by issuing unbacked USDT to buy Bitcoin, certified as a class in March 2026, six years after filing, over the objection of the issuer of the world’s largest stablecoin.

LATEST DEVELOPMENT · JUL 2, 2026

On 2 July 2026, the Second Circuit denied Tether and Bitfinex leave to appeal the class-certification order under Rule 23(f), leaving Judge Failla’s March 2026 certification in place and moving the six-year-old case into its post-certification merits and expert phase.

PREDICTED OUTCOME

AI-GENERATED · METHODOLOGY →

Settlement ~45% likely HORIZON: late 2027 to late 2028 CONFIDENCE: MEDIUM

The most likely ending is a negotiated class settlement, roughly 45 percent, struck after the summary judgment and Daubert round rather than before it, most plausibly between late 2027 and late 2028. Certification plus the Second Circuit’s refusal of Rule 23(f) review gives plaintiffs their first real leverage in seven years, and Tether now has both the cash flow and the strategic motive to clear a litigation overhang while it courts U.S. regulatory legitimacy and outside capital. A deal in the $250 million to $1.5 billion range with no admission of unbacked issuance is the shape that both sides can sign, since plaintiffs’ aggregate damages theory is enormous but discounted heavily by causation risk, and Tether’s prior regulatory resolutions show it prefers paying to litigating open-ended exposure. The single strongest driver of the call is Judge Failla’s decision to certify while expressly reserving causation for summary judgment: that keeps trial risk alive for defendants but signals plaintiffs must still prove artificial price impact, which is exactly the posture that produces a discounted number. The leading alternative, at roughly 35 percent, is a defense win on summary judgment or expert exclusion, where the court finds that plaintiffs cannot tie specific USDT issuance to Bitcoin price movements and dismantles the Sherman Act monopolization theory for want of a coherent market. A plaintiff verdict at trial remains unlikely, under 10 percent, because manipulation cases that reach juries on econometric inference rarely survive appellate scrutiny even when they win. Expect no resolution before mid-2027, since expert discovery on causation and damages in a 2017 to 2019 crypto class will consume most of the next twelve months.

Generated by claude-opus-5 on Aug 4, 2026, from this case’s record only. It stands until a major development changes the record. Not legal or investment advice. How predictions are made →

BACKGROUND

Filed in the Southern District of New York in 2019 and consolidated before Judge Katherine Polk Failla, the case alleges that Tether and Bitfinex issued hundreds of millions of USDT that was not fully backed one-to-one by U.S. dollars and used it to buy Bitcoin and other crypto-commodities when prices were falling, creating an illusion of demand that inflated prices. Plaintiffs assert market manipulation under the Commodity Exchange Act and monopolization and restraint of trade under the Sherman Act. Defendants deny the allegations and dispute that any unbacked issuance actually moved prices.

On 6 March 2026, after six years of pleadings battles, Judge Failla certified two classes, U.S. purchasers of crypto-commodities and a subclass of crypto-commodity futures purchasers, while narrowing them to purchases made with fiat currency or stablecoins and reserving the contested causation question for summary judgment. Tether and Bitfinex sought interlocutory review under Rule 23(f), but on 2 July 2026 the Second Circuit denied leave to appeal, leaving certification intact and pushing the case toward expert discovery, summary judgment and a possible trial.

TIMELINE

JUL 2, 2026APPEAL

Second Circuit denies interlocutory appeal of certification

The Second Circuit refused Tether and Bitfinex leave to appeal under Rule 23(f), leaving the certified classes intact.

Tether, Bitfinex denied appeal of class cert order
MAR 6, 2026PROCEDURAL

Judge Failla certifies two classes (with modifications)

The court certified spot and futures purchaser classes limited to fiat- and stablecoin-funded purchases, reserving causation for summary judgment.

New York Federal Court Certifies Crypto Class Action With Modifications
JUL 2024PROCEDURAL

Plaintiffs file slimmed-down consolidated complaint

After partial dismissals, plaintiffs narrowed their claims to Commodity Exchange Act manipulation and Sherman Act theories.
OCT 2019FILING

Market-manipulation class action filed in S.D.N.Y.

Crypto traders sued Tether and Bitfinex alleging that unbacked USDT issuance manipulated Bitcoin and other crypto-commodity prices.