Pump.fun MEV Scandal Explodes as Whistleblower Leaks 5,000+ Secret Chats

A federal judge has greenlit an amended class-action lawsuit against Solana-based memecoin platform Pump.fun, allowing plaintiffs to introduce over 5,000 internal chat logs as evidence of alleged maximal extractable value (MEV) manipulation.

On December 9, 2025, Judge Colleen McMahon of the Southern District of New York approved the motion to refile, citing new material from a confidential informant who resurfaced in September with the messages. Plaintiffs claim the chats reveal coordination among Pump.fun personnel, Solana Labs engineers, and third parties on transaction ordering, liquidity timing, and front-running retail users during token launches.

The suit, originally filed in July, accuses Pump.fun of marketing “fair” launches while enabling insiders preferential access via MEV—reordering transactions for profit. Retail traders allegedly served as exit liquidity, suffering billions in losses while the platform earned hundreds of millions in fees.

MEV, inherent to blockchains, becomes controversial when undisclosed in retail products. Plaintiffs argue it created an uneven field, potentially violating securities and RICO laws.

Defendants, including Pump.fun, Solana Labs, the Solana Foundation, and executives, deny allegations, stressing decentralized, permissionless operations and user risk awareness. Jito Labs was dropped earlier.

The amended complaint is due December 19, 2025, with dismissal motions in January 2026. No public release of chats; details emerge via filings.

The case could precedent-set MEV accountability in DeFi, amid debates on transparency and platform duties. As regulators eye blockchain mechanics, outcomes may influence fairness standards in high-speculation ecosystems like memecoin trading. Allegations remain unproven pending trial.