A thrash metal act from the São Paulo coastline, Maniac Force have been grinding out aggressive, no-frills thrash since 2007 with a consistent focus on anti-religious and violent themes. Their discography spans from the 2008 full-length 'Metal Invasion' through to 'Dead Planet' (2012) and the later releases 'Collective Illusion' and 'Psychological Horror,' both from 2019.

Manso Jeremías is a death/thrash metal band from Buenos Aires whose sound draws on Swedish death metal forebears such as At the Gates, Dismember, and Entombed. The band — comprising Claudio Filadoro, Martin Furia, Mariano Miranda, and Gabriel Raimondo — has released two records: DOBLEHACHA (2016) and the five-track MARABUNTA.

Manthra was a thrash/death metal band from Antofagasta, Chile, active from 2001 until their split in 2015. During their run they released two promo CD-Rs — El final (2003) and Inquisición (2004) — and later continued under the name Dark Manthra to distinguish themselves from an older Colombian band named Mantra.

Manto Negro is a groove/thrash/metalcore band from Clorinda, Formosa, formed in 2015 with a lineup of Luis Zamprogna (guitar), Ati Démön Fer (vocals), Alexis Torres (drums), and Hernán Garay (bass). The band released the EP Rockopolis Presenta a Manto Negro in 2020 and their full-length Oveja Negra in 2023.

A one-person DIY project blending thrash, hardcore, and grindcore with a deliberately absurdist sensibility, Marafo de Exú debuted in 2016 with the 16-track album "Diabólico Alcoólico," a chaotic slab of short, fast songs delivered with raw, lo-fi ferocity. The project also released a live recording from Destroy Music Now Fest 3, capturing the same unfiltered intensity in a live setting.

Marthiria were a thrash metal band from São Luís, Maranhão, active from 2006 until their split in 2010, with a lineup anchored by vocalist/guitarist Andre Nadler and guitarist Rodrigo Lages. They released the EP Sobrevivendo ao Caos (2008), a direct, riff-driven effort in the tradition of Brazilian thrash that earned them a foothold in the local underground before the band disbanded.

Marthirio is a two-piece thrash/crossover band from Santa Fe, Argentina, formed in April 2018 by Matias Echauri (guitars, bass, and vocals) and drummer Lucas Engler. Their debut album Mosh Till Death, recorded at Superyeah Studios and mixed by Anibal Rodriguez at Blazing Hatred Records, was released on August 25, 2021, and includes a cover of Sepultura's "Troops of Doom."

Martirio was a thrash metal band from Federación, Entre Ríos, Argentina, whose documented lineup included vocalist Gustavo Ferreyra, guitarists Daron Sánchez and Adrián Padin, bassist Nicolás Iglesias, and drummer Juan Pablo Casco. The band released the demo "Decadencia" in 2009 before eventually splitting up. They are catalogued on Metal Archives under the Argentine thrash metal scene.

Massakre is a pioneering thrash and death metal band from Santiago, Chile, founded in 1985 by Yanko Tólic, who built the project out of earlier garage bands Sepulcro and Embrión. Influenced by Celtic Frost, Slayer, and Hellhammer, they were among the first speed and thrash metal acts in Chile and Latin America, releasing their debut album Massacre in 1989 and continuing through Psychotic Redemption (2001) and Crematorium (2005). The band is also noted for their early adoption of corpse paint in a thrash metal context, a practice later imitated widely across the scene.