What events can cause a MegaCap to drop 10%> in a single 30 days period?

I'm trying to have a general idea of what events can cause this so I'd appreciate your input.

As far as I can tell there are internal causes, such as “underwhelming” ER like with FB, changes in top management like CEOs, and overvalued stocks, although this seems to be a mostly sector/market issue with mega caps.

Then there are external causes, such as legislation changes/possibilities of, major global issues that put stress in the market, such as COVID and War, and general sell-offs which are also sector/market dependant since most mega caps seem to behave similarly most of the time.

Anything else I should keep in mind that could cause a 10%>, especially ones that you can anticipate such ER?


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