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."

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.

Masterhead are a three-piece thrash metal outfit from the Fortaleza metropolitan area whose sound draws heavily from the Bay Area tradition, with Francisco "Mustaine" Alves handling both guitar and vocals alongside Denilson Andrade and John Nascimento. They built their catalog through the 2008 demo Enemy of Time and the 2017 EP Waiting Terror, later releasing the single Metal Warrior in 2021.

Matarte is a three-piece metal band from Punta Alta, Buenos Aires, Argentina, formed around 2013, consisting of vocalist Ulises Kaliléc, guitarist/bassist Jonathan Bazan, and drummer Agnatne Ajeivut. The band released their album "Sangra Maldad Eterna" on June 6, 2020, a ten-track record recorded, mixed, and mastered at Tumumu Untungu Home Studio in Punta Alta. Their sound blends melodic death and thrash metal with occult lyrical themes, as heard on tracks like "Dioses Muertos" and "Sacrificio Infernal".

Matricidium plays straight-ahead thrash metal rooted in the aggressive tradition of early Brazilian and US thrash, releasing their debut album 'Rise the Army' in 2012 through MS Metal Records and following it with an expanded European edition in 2014. In October 2015 the band completed their first European tour across nine countries, playing 15 shows in 23 days and establishing themselves beyond the domestic circuit.

Maverick channel groove-heavy riffing through a thrash and metalcore lens, with socially charged lyrics that address dehumanization and internal conflict. The band built a steady catalog including "Quid Pro Quo" (2014), "Cold Star Dancer" (2018), "Ethereality" (2021), and "Silver Tongue" (2024), demonstrating consistent growth in both production and songwriting since their founding by vocalist/guitarist Gabriel Sernaglia and drummer Gustavo Polississo.

Maze of Madness play straightforward heavy and thrash metal with a raw, stripped-back energy, releasing their debut album "Mass Hatred" in July 2022 shortly after forming. The eight-track record plants the band firmly in the tradition of classic thrash aggression without straying far from the genre's foundational template.

Mazemath is a thrash and death metal band from Santiago, Chile, formed in 2015. Their debut album The Illusion of Freedom, released in 2016 and recorded at AudioCustom Studios in Santiago, introduced the band's aggressive approach to politically and cosmically charged lyrical themes including environmental destruction and political corruption.