Sukkubys is a depressive black metal project from Los Angeles, California, formed in 2023, channeling the introspective anguish and lo-fi bleakness central to the DSBM tradition.

Sumeria is a black metal band from Downey, California, active since 2017 and drawing thematic and sonic inspiration from ancient civilizations within a raw and aggressive black metal framework.

Summation is a black metal band from Salinas, California, formed in 2020, operating in the raw and atmospheric traditions of underground American black metal.

Summoned is a death metal and grindcore band from Whittier, California, formed in 2007, combining the brutality of death metal with the speed and aggression of grind.

San Jose's Sunami have become the undisputed champions of modern beatdown hardcore, delivering anvil-heavy riffs and earth-shaking breakdowns that have made their live shows some of the most physically intense experiences in the entire hardcore world. Their self-titled 2022 EP and Flatspot Records releases distill hardcore down to its most primal, pit-destroying essence, with vocalist Julian Corrales's ferocious delivery driving songs built for maximum crowd violence. Sunami's no-frills, caveman-riff approach has resonated far beyond the hardcore scene, earning them crossover appeal and massive festival bookings.

Sungrinder is a stoner metal and rock band from Orange County, California, formed in 2015, rooted in the Southern California tradition of sun-scorched fuzz riffs and hazy, groove-driven heavy rock.

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Suntorn are a brutal death metal and deathcore band from San Diego, California, formed in 2016, unleashing punishing down-tuned brutality that combines the hyper-technical slaughter of brutal death metal with the breakdowns and heaviness of deathcore.

Supernaut is a stoner metal band from Santa Cruz, California, whose name is a nod to the Black Sabbath classic, channeling sun-baked, riff-heavy grooves rooted in the California coastal underground scene since 2017.