I don't know if you ever worked on big tech? Everyone knows this through gossips, referrals, friends of friends etc. The hard part is to figure out how actionable this information is.
> information that can move markets.
That's the hardest part to figure out. Stocks aren't very correlated with anything. Slight changes in this quarter's iPhone sales in China doesn't move the share price very much if it is within range of expectation.