Blistering Groove / Thrash Metal / Crossover (early); Alternative Metal / Rock (later) from Houston.

Sonoros is a death/thrash metal band from Tucson, Arizona, formed in 2020, bringing hard-hitting aggression and technical riff work to the Sonoran Desert underground metal scene.

Sonoroum is a thrash metal band from McAllen, Texas, formed in 2021, representing the thrash underground along the Rio Grande Valley with driving, aggressive riff-based attack.

Soothsayer are a thrash metal band from Phoenix, Arizona, formed in 2021, playing aggressive, riff-driven metal in the classic tradition of the genre within the Southwest's active thrash underground.

Soraya are a heavy, speed, and thrash metal band from Palmdale, California, formed in 2021, channeling the raw energy of classic 80s metal into a modern context with an emphasis on speed and traditional song structures.

Sorcerer are a Tampa, Florida death/thrash metal band formed in 2011, emerging from the city's storied extreme metal tradition with a sound that combines the aggression of thrash with the brutality of death metal.

SoreLoser are a Tacoma, Washington thrash metal and metalcore band formed in 2015, merging the aggressive riffing of thrash with the rhythmic intensity and breakdowns of metalcore in the Pacific Northwest underground.

Sosra is a thrash and heavy metal band from Bellingham, Washington, formed in 2015, drawing from classic American thrash traditions while incorporating traditional heavy metal influences.

Sosterik is a Pittsburgh heavy/thrash metal band formed in 2018, channeling the blue-collar intensity of Pennsylvania's industrial heritage into a hard-hitting blend of classic heavy metal and thrash.

Souflikar is a thrash/death metal band from Elmhurst, Illinois, formed in 2015, driving aggressive, riff-forward metal from the suburban Chicago underground.

Soul Divided is a Louisville, Kentucky crossover thrash band formed in 2017, blending the aggression of hardcore punk with thrash metal riffing in the tradition of classic crossover acts.

Soul Grinder is a Portland, Oregon heavy and thrash metal band formed in 2022, channeling classic metal aggression into a city known for cultivating independent and underground heavy music.

Soul Release is a Buffalo, New York act that fuses neoclassical and thrash metal, incorporating shred-oriented guitar work into an aggressive thrash framework. Formed in 2012, they draw on the technical tradition of guitar-driven metal rooted in both classical composition and speed.

Soul Terror is a Maryland band formed in 2013 that melds death metal, doom, and sludge into a slow-grinding, punishing sound. Their genre crossover places crushing heaviness at the center, drawing from both the morbidity of death metal and the oppressive weight of sludge and doom.

Soul Trap is a groove and thrash metal band from Blackstone, Massachusetts, formed in 2018. They combine thrash's forward momentum with groove metal's rhythmic punch, rooted in New England's active heavy music scene.