In this particular case, the stock sales before collapse were 'scheduled' just weeks before the sale, as opposed to many normal circumstances when it's scheduled months or even years in advance:

"The sale of 12,451 shares on Feb. 27 was the first time in more than a year that Becker had sold shares in parent company SVB Financial Group, according to regulatory filings. He filed the plan that allowed him to sell the shares on Jan. 26." [1]

[1] https://fortune.com/2023/03/10/silicon-valley-bank-ceo-greg-...