Sigma Editions was founded in 1998 by Rosy Parlane and Dion Workman. Parlane and Workman began working together in New Zealand in 1993 as the improvising trio Thela with Dean Roberts. After moving to Melbourne, Australia in 1997 the pair decided to launch a label to release their own work and the work of new artists they admired. The name sigma refers to Scottish/Italian writer Alexander Trocchi's plan for a utopian international artistic/political community.

Since 2003, Sigma Editions has worked as a partner label with Antiopic. The currently-available items from the Sigma Editions catalog are below; for a full discography and history of the label, see www.sigmaeditions.com.