It's single percentage share by operating system, not by manufacturer. Apple is top OEM by marketshare. (If you believe comscore is accurate enough)
https://www.comscore.com/Insights/R...ry-2016-US-Smartphone-Subscriber-Market-Share
The fact that Apple has a single digit percentage isn't affected by the possibility that the other 90+% can be owned by a single company or split among 20 companies with Apple as number 1.
The numbers you cite are US sales. And if Apple is 43.6% US and sub 10 globally it just shows the US market is becoming less important and 43.6% in the US means Apple must be utterly failing outside the US to get their total under 10% while selling that many in the US.
Also interesting news today, Mac sales are down another 15% to a 6.1% market share. The lowest in 5 years. Which is hardly surprising since the machines from 5 years ago were better than they are today. I'm sure someone with the username "I7guy" will both care about that fact and agree. http://www.infoworld.com/article/3155128/macs/macs-share-falls-to-five-year-low.html
Without a computer to anchor it, the ecosystem simply doesn't exist for me.