The financial markets has not functioned in the way you think it functions for a long time.
Institutional investors (banks, mutual funds, hedge funds, etc.) control 80% of the market, while retail investors (people like you and me) controls 20%. You guys wanna take a guess as to who the institutional investors favor, by a long shot? Also, to get deeper into this, a lot of institutional investors are passive investors (ETFs), which means they just passively buy stocks, regardless of expected performance.
The takeaway from this is that if you think retail investors (you and me) can still have an impact on stock prices, you are being too idealistic.
Not to say that their stock prices won't drop a bit on Monday, but if you are expecting actual significant impact (drops of -10% or worse) on these companies, I wouldn't hold my breathe.
Edit: I do agree that longer term, we may be able to make a difference. But in the short-term, I wouldn't expect anything drastic so don't be disappointed. Hold steadfast and we may be able to see results in 1-2 years!
Price fixing and stock manipulation to start. Shareholders have been hurt. Lawsuits will fly.
I have very little faith in the government left...
As for shareholders, there was a roundtable of 100 CEOs (huge companies like JPM, GE, etc.), where they signed a document saying that shareholder value will not be their primary goal anymore, and instead there are social and environmental goals that will now be as important as shareholder value. This was in response to BLM this summer, and guess how many shareholders cared or even knew about it...