Cool, thanks for the example. Again, apologies as a layperson/everyday investor -- Can you explain what 'D - Disposition to the issuer of issuer equity securities' means, and how that is different from something like 'S - Open Market Sale'?

If the Waltons dumped $120m in common stock, is that significant to the market? How so?

Just trying to tie that in with how a retail investor would go about this.