Marmot is actually owned by Jarden, but that's somewhat hidden. At first glance, K2 owns Marmot, but Jarden owns K2. Jarden is a big company.
Columbia is now a publicly traded parent company of various outdoor brands.
You're right about Patagonia's footwear. I found a link http://www.wolverineworldwide.com/main_history.asp
You're also right about Big Agnes, but they're a very small company. Only 3 full time and 20 part time employees.