Because SEC filings matter....
...development is overseen by a core group of developers including those employed by MIT Media Labs Digital Currency Initiative and the Bitcoin Foundation (the Core Developers)...
For those that have problems keeping up...
...paid by a single employer to do a very specific job...
of the Bitcoin Core developers work at the MIT Media Lab. The Bitcoin Foundation don't employ any bitcoin developers at the moment, afaik. If they do, it must be a very cheap one. The rest are employed elsewhere, by various companies, own startups etc. Bitcoin Core is certainly not a company. It is a very loosely connected group of people who do various amounts of work on bitcoin.