(Nantong) Sinomusic Enterprise started out in the late 1980's making Violins and related instruments and have expanded into Woodwind, Drums, Accordions, Instrument Cases as well as all manner of fretted chordophones. At some point they took over or murged with Taixing Aiersi Guitar Musical Instrument Co., (founded in 2001), who make a very full range of instruments including Guitars, Banjos, Weissenborn Guitars, Mandolins plus a full range of all scales of Ukulele from Sopranino to Bass, and some Banjoleles, Resonator, semi-acoustic and electric Ukuleles; in fact they claim to be China's Largest Guitar and Ukulele manufacturer.
Aiersi Guitars is the main house brand name but they are also the OEM for Koa Pili Koko, (and they also sell them direct, having dropped the Koa so as just Pili Koko, they may even own the name now?), Kamoa, (another brand they may even own, I'm not sure?) and a lot of others I won't list here unless I see some firm evidence; (plus they make some ukulele kits that I suspect are purchased by third parties outside China, assembled and branded as locally produced instruments - again though I can't prove it).
I have also seen their output branded as Berkeley, Laiersi, Bali Hai, Rainie, Headway, (nothing to do with the Japanese firm Headway Guitars), and there may be others. Whether they own the brand or its more OEM I don't know. Even without official acknowledgement though, it looks like they are OEM for a number of more famous and prestigious Ukulele brands too.