…are no longer made by Ball Corporation.
The jars still carry the “Ball” logo (exactly the same as that used by the Ball Corporation), but they are now apparently made by “Jarden Home Brands”. More info at the URL “freshpreserving.com“[1]
This might be the most confusing branding issue I’ve ever seen.
[1] This site looks pretty thorough and useful, despite the Flash-into-with-music.