Cartoonists published by Sparkplug included Austin English, Jason Shiga, Renée French, Julia Gfrörer, Katie Skelly, Juliacks, Yumi Sakugawa, Whit Taylor, Elijah Brubaker, and Jeff LeVine.

Sparkplug eschewed traditional distributors and comic book retailers; instead focusing on festivals, conventions, and direct sales through the company website.

[1] One of Sparkplug's first projects, Jason Shiga's Fleep, was the 2003 Eisner Award winner for Talent Deserving of Wider Recognition.

From 2008 to 2015 Sparkplug co-published annual mini-comic anthologies in commemoration of Free Comic Book Day; they were always produced in partnership with Tim Goodyear's company Teenage Dinosaur as well as other Portland-area small-press publishers.

Sparkplug founder Dylan Williams died of leukemia in September 2011;[1] three projects were published posthumously via the crowdfunding site IndieGoGo.