P.E.S.T. is a hardcore punk project from Missoula, Montana led by Pearl Jam bassist Jeff Ament, who performs under the name Jeff Diction. The band formed in 2021 and includes Dave Parsons on vocals, Charlie Beaton on guitar, and John Wicks on drums. Its releases include a run of EPs issued since 2022, with material that reflects Ament’s longtime interest in punk and hardcore. The project has played live in the United States and Canada, including festival appearances and support dates. The group’s recorded output is short-form and fast-paced, with titles and themes rooted in Montana references, skate-punk humor, and anti-authoritarian lyrics. P.E.S.T. is distinct from Ament’s work with Pearl Jam and functions as a separate hardcore act rather than a tribute or one-off side project.