Of the total amount they had, they first sold 10%, and then another 75%, which leaves them with only 15%, which roughly leaves them with around 6000 BTC. It would be good if they sell that too and end the story about how Mr. Mars wishes good for anyone, except for himself and his company.
Those 10% and 75% are numbers of the initial purchase or the amount they had held at the mentioned date because if they sold 105 of the initial and and then 75% of the leftover they still might have 22.5 of the original sum, I've seen his quoted in different ways from 75% of their holdings (which would mean current state) to 75% of their purchases so it would mean initial stock.
But if you think Musk is done with or plans on giving up, there is no way, he loves what he's doing with those tweets, with his small announcements on purchases and sales, with his tweets about war, peace, and even lately trolling Medvedev on Twitter, he loves the attention and people, even if they dislike him still are giving him some, this will go on forever.
Saudi Aramco is the largest. In fact the family behind Aramco is the richest on earth than Elon, they are just not showy.
There would have to be a massive adoption of EVs to which gas and oil are not needed for Tesla to rise up. It will need the company to go bankrupt for Tesla to be richer than Saudi Aramco.
Saudi Aramco is owned by the state, despite Saudi Arabia being a quasi-dictatorship it doesn't make that company totally theirs, they can't just pack all of it up and move it to some other country nor can they sell it, if the shares get sold the owner is the government and they need that money if Musk sells then those are his money and he can do whatever the wants with it.
And about them not being showy...lol. Are you serious?