A profitable company has no need to be excessively concerned about its stock price. Of course, at some point, shareholders might consider putting on pressure, but that doesn't really seem to have happened even with Tesla. And in closely held companies, that kind of pressure is much stronger — it's not like Musk has $70B of spare change in his couch pillows, so he'll always have to deal with co-owners.

Most importantly, the co-owners are less likely to ask why a particular step to maximize profits in this quarter hasn't been done. To say nothing of activist shareholders who theoretically could sue; such things killed a few still-profitable companies, and Tesla isn't one yet.

Boeing is publicly traded under the ticker BA...

I meant the SpaceX stock doesn't swing wildly every time news like this comes out:

https://www.investopedia.com/news/spacex-will-fly-astronauts...

Or this:

https://arstechnica.com/science/2018/07/nasa-commercial-crew...

(I clarified my original comment)

SpaceX is privately held, unlike Tesla.

Yes, that's the point.