I believe that Bernina is the only one of the major sewing machine manufacturers that is still owned by the original family. I don't know if they make machines for other companies or contract out any of their machines, though, or where their factories are located.
I'm actually glad that some modern Singers are being made by Janome - I have a lot more faith in Janome than I do in Singer these days. (Although vintage Singers are some of my favorites.)