Lazaro is a thrash metal band from Rafael Castillo, Buenos Aires, founded by guitarist Jorge Moreno following his departure from the long-running Argentine thrash act Serpentor. The band carries on the tradition of socially and politically charged thrash metal from the Greater Buenos Aires underground scene.

M-19 is a thrash metal band from Porto Alegre, Rio Grande do Sul, Brazil, originally formed in 1989, drawing influence from Slayer, Destruction, Kreator, and Sepultura. After releasing demo tapes "Manifest of Insanity" (1989) and "When a Promise Is Broken" (1994) and a decade-long hiatus, the band returned to release the full-length "Mission: Destroy" in 2013 and "Sic Semper Tyrannis" in 2019, the latter celebrating thirty years of their founding.

Machinaria were a heavy/thrash metal band from Bagé, Rio Grande do Sul, Brazil. Their 2014 debut full-length Sacred Revolutions, Profane Revelations drew comparisons to second-wave American thrash acts such as Sacred Reich and Vio-Lence, and was built around a conceptual examination of the Catholic Inquisition. The album earned the band recognition as a standout name in the new generation of Brazilian thrash.

Madkill is an old-school thrash metal band from São Paulo, Brazil, formed in 2014 and rooted in the aggressive speed and thrash traditions of the Brazilian scene. The band released their debut album "Mass Destruction" in 2014 and followed it with "Intense Violence" in 2019, a ten-track record described as old school thrash/speed metal with tracks such as "Thrash City" and "Saint Death". They have remained active into the mid-2020s, releasing the politically charged "Protesto" in 2024.

Malaria is a thrash metal and crossover band from Merlo, Buenos Aires, operating in the tradition of aggressive street-level metal with lyrical themes spanning war, social commentary, and the mosh pit. The band has self-released multiple recordings on Bandcamp, including a three-track demo (2016), the eight-track "Future Decimation EP" (2017), and the two-track "Piss Tape" (2018).

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.