NY Court Certifies USDT Market-Manipulation Class Action Against Tether & Bitfinex
A U.S. federal judge in the Southern District of New York has granted class-action certification to investors suing Tether and Bitfinex over alleged USDT-driven manipulation of Bitcoin and Ether prices. Judge Katherine Polk Failla’s sealed Feb. 23, 2026 opinion splits the certified class into two groups — U.S. purchasers of spot crypto and U.S. purchasers of crypto futures from March 2017 to February 2019 — while narrowing and modifying class definitions and allowing key expert testimony. Plaintiffs allege Tether issued insufficiently backed USDT during 2017–2019 to buy large quantities of BTC and ETH, creating artificial demand and inflating prices; some legal theories (including portions of earlier RICO claims) were narrowed by the court. No monetary judgment was issued; the ruling moves the long-running 2019 case into coordinated collective proceedings, likely triggering expanded discovery, expert disputes and protracted litigation. Defendants deny wrongdoing; Tether and Bitfinex previously settled a separate New York Attorney General probe in 2021 for $18.5 million without admitting liability. Potential collective damages have been estimated by plaintiffs in the billions to over $100 billion, raising regulatory and market scrutiny of USDT, Bitfinex and stablecoin issuance practices. Traders should monitor discovery developments, expert reports and any market or regulatory responses that could increase volatility for BTC and ETH and affect liquidity tied to USDT.
Bearish
The class-certification ruling increases legal risk and regulatory scrutiny for Tether and Bitfinex and raises the prospect of large collective damages, which can undermine confidence in USDT as a stablecoin and reduce market liquidity. For traders, that typically translates into increased near-term volatility and downside pressure on the cited cryptocurrencies (BTC and ETH) because USDT is a major on‑ and off‑ramp and liquidity source. Expanded discovery and protracted litigation can surface adverse evidence or regulatory actions that further stress stablecoin markets and exchange operations, potentially harming short-term price stability and trading volumes. Over the longer term, outcomes depend on discovery findings and any regulatory or market reforms: a conclusive exoneration would limit sustained damage, while findings of misconduct or stricter regulation on stablecoins could have prolonged negative effects on liquidity and risk premia for BTC and ETH.