diff --git a/Collectively-owned-instances.md b/Collectively-owned-instances.md
index b3c3813..1152b3e 100644
--- a/Collectively-owned-instances.md
+++ b/Collectively-owned-instances.md
@@ -42,6 +42,9 @@ These may or may not be technically controlled by the non-profit yet, for exampl
 * [en.osm.town](https://en.osm.town) - for the OpenStreetMap Community *(Mastodon)*
 * [swiss-chaos.social](https://swiss-chaos.social) - Chaos Computer Club Switzerland *(Mastodon)*
 
+Formerly affiliated with a non-profit:
+* [sigmoid.social](https://sigmoid.social) - The Gradient Inc ([dissolved in 2021](https://opencorporates.com/companies/us_ca/4199176)), CA, USA *(Mastodon)*
+
 There are also multiple instances connected to hackerspaces, anarchic groups and other unincorporated collectives. Because it's hard to draw a line to describe such situations, they're not included here.
 
 ## Resources on running an instance