That would be Boeing Defense, Space & Security (50,000 employees and $23.3 billion in revenue vs 12,000 employees and $2 billion revenue)

runs one of the biggest car companies.

Tesla, with it's $81 billion in revenue, doesn't even crack the the top ten.

just eliminated rare earth metals for new generation of motor

Just announced it would eliminate rare earth metals. This will be a great thing if/when it happens, but it hasn't happened yet.

runs Twitter which is undeniably more active and popular than ever.

Annual users appears to be up, but down in the US [0]. But if we use annual users as a proxy for "active and popular" then I'll give this to you.

So, 1 for 4.

[0] https://www.businessofapps.com/data/twitter-statistics/

Edit: taking chroma’s post at face value, you’re at 50%.