Categorize the companies based on their ownership status as private or public.
Twitter, SpaceX, Tesla
Private held : Twitter, SpaceX
Public : Tesla
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Categorize the companies based on their ownership status as private or public.
Twitter, SpaceX, Tesla
### Input: 
### Response: Private held : Twitter, SpaceX
Public : Tesla