Aversus formed in 2012 in Centenario, Neuquén, blending metalcore aggression with thrash metal riffing in a corner of Patagonia that has produced only a handful of extreme acts. The band is signed to Marfus' Records, a Neuquén-based label dedicated to thrash, death, and metalcore from the region.

Axecuter is a speed/thrash metal band from Curitiba, Paraná, Brazil, formed around 2010–2013 and signed to Sangue Frio Produções. Devoted to early 1980s metal worship with zero concession to modern trends, they deal in grinding buzzsaw riffs and breakneck tempos, releasing albums such as Metal Is Invincible, Headbangers Afterlife, and A Night of Axecution, and have appeared on Brazilian tribute compilations including a Sabbat tribute.

Azoth is a thrash metal band from Brasília, Brazil, active since 2015. Named after the alchemical term for mercury and the philosophical universal solvent, the band delivers aggressive, riff-driven thrash rooted in the classic Bay Area and Brazilian traditions. They remain an active presence in the Brasília metal underground and maintain a Bandcamp profile through Azoth Recordings.

Ação Libertária is an antifascist crossover thrash band from Natal, Rio Grande do Norte, Brazil, blending hardcore punk aggression with thrash metal riffing and sharp socio-political commentary. Their 2016 full-length "Cidadão de Bem" — a sardonic swipe at Brazilian conservative culture — captures the band's confrontational energy and reflects the turbulent political climate of mid-2010s Brazil.

B on Reason is a heavy/thrash metal band from Pernambuco, Brazil, formed in 2021. The project spans multiple releases including albums titled The Mission, Endless Siege, and The Empire of Lost Souls, carving out a self-described universe of metal, game, and multimedia content. Their sound sits in the classic heavy metal and thrash tradition rooted in the Northeast Brazilian underground.

Baba de Sheeva is a thrash/crossover band from Goiânia, Goiás, Brazil, bringing the fast and irreverent spirit of the genre to the Central-West metal scene. Formed with themes revolving around life, religion, drinking, and weed, the band released the CD-R É Triste O Destino Da Maioria Dos Homens in 2011 and has remained an active presence in the Goiânia underground. Their sound blends the aggression of old-school thrash with the punk energy of crossover.

Backstroke is a thrash metal band from Brasília, Brazil, formed in 2019. Operating out of the capital's underground scene, the band channels straightforward, aggressive thrash in the Bay Area and Brazilian tradition. They remain active as an independent act in the Brasília metal community.

Bacteria is a heavy/thrash metal band from San José, Entre Ríos, Argentina, active since 1999. The band appeared on the 2009 compilation "2dos. Puro Metal" released by Kodigo Rojo Records out of Concordia, Entre Ríos, one of the few regional metal labels documenting the underground scene in that province.

Bad Taste is a death/thrash metal band from Porto Alegre, Rio Grande do Sul, Brazil, formed in 2017. They operate out of the South Brazilian underground, a region with a strong tradition of extreme metal, playing aggressive thrash rooted in the death metal aesthetic. The band remains active as an independent act.