A U.S. federal court has permitted plaintiffs to amend their class-action lawsuit against Pump.fun and Solana Labs, incorporating over 5,000 internal chat logs as evidence of alleged MEV manipulation in token launches.

The plaintiffs allege that MEV, or maximal extractable value, allowed insiders to reorder transactions for profit, prioritizing their buys on new memecoins before public trading.

This story is an excerpt from the Unchained Daily newsletter.

Jito Labs was initially named in the lawsuit, but later “dropped without prejudice.” Jito developed key MEV infrastructure on Solana, including the Jito Block Engine, bundles, and open-source tools like the MEV bot and SDK for backrun arbitrage.

Chat logs described as confidential reportedly show Pump.fun staff, Solana engineers, and Jito Labs executives coordinating advantages.

Burwick Law, the firm handling the plaintiffs’ legal proceedings, shared the amended complaint on X. Industry watchers have argued that the new evidence was merely a delaying tactic. 

“I’m not a lawyer but this lawsuit against Pump.fun and Solana feels dumb and frivolous,” said Delphi Ventures Founding Partner Tommy Shaughnessy on X. 

“They are twisting standard MEV mechanics and neutral infrastructure to appear as a ‘secret inside lane’ but even Jito was dropped from the case and they built the tool.”