Ultra-processed is a meaningless word used to get media attention. The state of nutrition science is abysmal.
I've heard people say that even bread is ultra processed... I guess we're supposed to go back to eating twigs and berries.
Things I do not include when I bake at home, which I found from the first hit I got by searching for "bread" in a local Norwegian store's web site: E 472e emulgator, E 471 emulgator, margarine, dextrose, E 300 flour treatment, amylase enzymes, xylanase enzymes.
And that's a fairly short list compared to Walmart bread: https://news.ycombinator.com/item?id=48411980