Apparently the CEO sold a lot of his stock on Nov 29th and kept the bare minimum amount.
https://www.fool.com/investing/2017/12/19/intels-ceo-just-sold-a-lot-of-stock.aspx
These stock sales need to be approved months in advance just for this purpose. It's schedule SO THAT they don't have the SEC breathing down their neck. But, the question really is, how long ago was this approved and schedule, and how long ago did Intel know about the issue? As mentioned by another, since Apple has already patched, it was known prior to it's public release.