Also, it seems that Navitas is, in fact, manufacturing their own cells now. Maybe a new add to the list.
Maybe, but I think I am maybe not being clear enough that the bar for inclusion in this list is high, the original purpose of the post was specifically to try to separate the actual manufacturers from the rebrands and such, as such the bar of evidence is high, because the original intent is to separate the actual manufacturers from the dozens of companies that misleadingly call themselves manufacturers. My learned skepticism with this market leads me to give very little weight to whether a brand says they manufacture their own cells or not, without corroborating evidence, that on its own is barely more meaningful than whether they say they are Grade A or not.
As your inquiry into Topband, Navitas illustrates, its sometimes a little like a russian nesting doll when trying to figure out who manufactures what, who is a brand or rebrand, a seller, etc. In many cases they are truly manufacturers, in many cases they stretch the word manufacture (ie they assemble packs, or they wrap cells and drill or weld the terminals, and in a few cases they just outright lie. If you look at Alibaba sellers, one commonality between many of the resellers, the actual manufacturers, and the companies that fall somewhere in between is they all will have a bunch pictures of big business and manufacturing campuses, lots of shots of workers in bunny suits in labs and factories, half these companies are using the same bank of stock photos as eachother. Not saying this is true of topband or navitas, but I'm also not saying that its not. From what I recall, even Amy (Shenzhen Luyuan) had language on her website at the beginning implying they were a manufacturer.
I look forward to seeing what you unearth, and what the company says, and if you can find enough info on one or both companies, I will include them. One possibility is that these (Navitas, Topband) could be two names for the same thing (one brand name and one company name, or the strangely common practice of Chinese companies having 2 or more company names for the same company (for instance, best I can tell, the company that makes the JBD BMS goes by 3 different names ('JBD Battery PCB store' on Aliexpress, 'Dongguan Jiabaida Electronic Technology Co.' Co on Alibaba, and 'Shenzhen LLT Electronic Technology Co.' on the web..))