Generally, insiders rarely sell back into the market. Instead, they receive their investment on the backend...if/when they sell the company, or if the company has considerable value, their credit rating and/or financial leverage is improved in proportion to the value of their position.
It would have been an extremely smart investment, and one that a person 'with millions' would not pass up. 434M for approx. $300K one year ago would be worth approx. $1.64M today.
There's a difference between being 'worth' millions, and 'having' millions. One is not liquid.
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