Why does it blow your mind? Knowing that would require a fair amount of domain specific knowledge regarding corporate finance, and trading regulations which are a niche topic for the vast majority of folks.
Not to mention, securities regulations vary significantly by legal jurisdiction, and most of the knowledge that people have about how securities are actually traded are informed by soundbites from media and dramatic representations in movies.
Hell, I worked at HSBC in various roles for several years, and took as much finance training as I could while I was there, and I don't really understand a lot of the rules and regulations in the jurisdictions I work in (mostly Canadian and US places).