Satoshi was technically a miner. And as far as we know, he most probably hasn’t sold any bitcoin. :p and it’s safe to assume that there were some old school miners that hasn’t sold much of their holdings too. But if we’re talking about not selling 100%? Besides Satoshi, quite unlikely I think.
We can't be too certain that it's just that single wallet with 1 million BTC that Satoshi holds which hasn't moved till date. Recently I read somewhere of a wallet that had around 50btc moving for the first time in nine years. And there were several wallets hodling 50btc each which hadn't moved too. I'm sure (even though I have no evidence that those aren't Satoshi's, we still can't say for sure that Satoshi doesn't have wallets hodling bits of Bitcoin for him. Again, it would be surprising that someone hasn't sold any percentage of their Bitcoin hodling at all till. Not sure that's possible.