I believe that NorthStar, Powerhorse, Iron and Oak, Dosko, and GNE brands are all owned by Northern Tool (or a parent/captive company), even if several of these are not sold in their retail stores or catalogs. That does not mean that they are all the same quality - they are designed for different market segments, sales channels, and price points. As a privately held company, it is harder to find information on all of NT's holdings, than, say for Huysqvarna, but there are some news clippings and profiles. They recently purchased The Sportsmans Guide, The Golf Warehouse, and K&M Manufacturing according to news reports. I have heard them say that they are the largest single purchaser of small Honda engines in the US.
Philbert