Jonah Kumalae started his Ukulele manufacturing company in Hawaii in 1911 and was the first person to mass produce Ukuleles - making 300 a month at the start, (He may also have been employing other local luthiers to do piece work at this time?) 

In 1915 they were the manufacturer who sponsored the Ukulele exhibit at the Panama Pacific International Exhibition. This was the show that really launched the Ukuleles initial popularity, (and earned the P.P.I.E. Gold Award that was proudly put on the headstocks of all Kumalaes after this - I'm sure it wasn't a fix). Kumalae also signed an exclusive deal for distribution on the Mainland with Sherman Clay & Co. which ran for a while. 

For most of the time Kumalae was in business they had a standard catalogue of 6 levels of decoration from style O with a crown headstock and a single ring around the soundhole for a rosette, through A, (3 rings) to E with "fancy inlay around soundhole and down center of fingerboard; fingerboard and top edge bound with fancy rope pattern inlay; fancy scrolled head". Outside of this they did make some with other decorative features as special models for distributors like Ditson.

Kumalae is also credited with inventing the Sopranino Ukulele, and calling it "the Mini", (as he invented it and called it Mini then so do I, rather than Sopranino). This might have come about as a result of the small 5 fret sales samples they made which are reputedly perfectly playable and I have seen a couple come up for sale. Unusually for Hawaiian manufacturers Kumalae also included early "California style" Banjoleles in their range, (though these could have been brought in and re-branded?) There is an unanswered question as to whether Kumalae made other brands of Ukulele or even made unbranded Ukuleles for others to brand? The official answer is no given the number of Ukuleles sold by others, (like Sherman Clay and Bergstrom), that still prominently carried the Kumalae logo and often had "Made by Jonah Kumalae for..." on the soundhole label, however there are a number of more obscure brands from Hawaii at the time that look almost, (and given the handmade nature of production at the time not even every example of the same model is identical), identical to ones branded by Kumalae. This is where the suspicions lie but there is no firm evidence of other brands and it is not a long stretch of imagination for people who learned luthiery working for Kumalae to then make very similar Ukuleles, or like Bergstrom, have other small outfits do piece work for them, outfits who would then have very similar models as they own brands. It is also the case that most Hawaiian makers of the time copied his 0-5 levels of decoration

Production continued until 1940 when Jonah Kumalae died and the factory closed, though some dating is possible as the original factory burned down in 1922 and its address 1719 Lilika St. was included on the sound hole label.

There is now a Japanese firm selling new Kumalae Ukuleles but I don't think these have anything to do with Jonah, his family or the original brand.