Germany Looking for a list of the world's largest private firms

[quente1307]

I'm writing my bachelor thesis about disclosure transparency of private firms. Therefore I'm looking for a list of the world's largest private firms. A good criteria for ranking the companies would be the number of employees. However, I haven't found a list so far that I could use. Does anyone here have any ideas where I could find a good list?

Thanks a lot in advance for any ideas/ suggestions on how/ where to find a list...