Wikimedia, maybe, but Wikipedia itself acknowledges it in the lead paragraph:

https://en.wikipedia.org/wiki/Wikipedia

> Founded by Jimmy Wales and Larry Sanger in 2001

https://en.wikipedia.org/wiki/Jimmy_Wales

> Most notably, he co-founded Wikipedia

Wikipedia shows integrity even when its co-founder does not:

https://en.wikipedia.org/wiki/Jimmy_Wales#Co-founder_status_...

> In late 2005, Wales edited his biographical entry on the English Wikipedia. Writer Rogers Cadenhead drew attention to logs showing that in his edits to the page, Wales had removed references to Sanger as the co-founder of Wikipedia.[53][54] Sanger commented that "having seen edits like this, it does seem that Jimmy is attempting to rewrite history. But this is a futile process because, in our brave new world of transparent activity and maximum communication, the truth will out."[20][55] Wales was also observed to have modified references to Bomis in a way that was characterized as downplaying the sexual nature of some of his former company's products.[16][20] Though Wales argued that his modifications were solely intended to improve the accuracy of the content,[20] he apologized for editing his biography, a practice generally discouraged on Wikipedia.[20][55]