In my experience, the problems highlighted here (e.g. lack of coverage, consistency, and/or accuracy) are typical of collaborative data projects such as Wikidata and Wikipedia. Using Wikidata and the likes to power entity-oriented applications automatically is always challenging. But I guess the lack of constraints is also one of the main reasons why those projects are successful :)
@Darren: can you elaborate on "I wondered if anyone else is actively working on fleshing out the company data within Wikidata?".
I guess most edits are manually made by individual editors based on personal interest.
And dataset imports are typically both small-scale and specific, like this recent project to import video games companies:
Cheers.
-N.