Very interesting. Often I only perceive the stock market as existing equity changing hands and the stock value of the company not being immediately relevant for its success (it's just third parties trading ownership around, after all), but I rarely heard of cash raises for the company after the initial IPO - of course only because I didn't pay attention and mostly IPOs make the news.
It's insightful to put such documents into Claude and see how they use many different financial mechanisms to raise the money. $15B sold directly to the big banks, $40B sold to the market (but also facilitated by these banks), a direct investment (PIPE) from Berkshire. Pretty cool how financial markets do these things.
excluding IPO proceeds, existing public companies in the US raise about $200B a year through selling shares on stock markets. This DOES NOT include stock-based comp, which is simply another form of funding operations post-IPO using public markets.
Stock based comp is another $350B a year in US markets alone. So if you think about public markets as an avenue for companies to raise capital, post-IPO firms are doing it to the tune of more than half a trillion a year.