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Is it possible to influence a company's actions by buying stock?
To quote Adam Smith, 'Everything is worth what its purchaser will pay for it'. In this case, that means, the value of a stock is equal to the price that someone will pay for it. If you buy shares in a company, the number of people who want shares in that company has just gone up by 1. If you buy shares in companies profiting from the DAPL, you are increasing demand for those shares. You are actually making those shares more valuable, not less. If you bought all those shares, then you could simply shut the pipeline down. But that means you'd be spending billions of dollars to do so - and that money would go to the people who own the company now. The concept of 'Shareholder Activism' that you refer to, is actually more that an individual who owns a substantial number of shares (usually in the 10% ballpark) will become outspoken on the direction of the company, and attempt to elect board members who will take action to suit their liking. This is done to increase the profits of the company, so that the shareholder can make more money off of their investment. It is very expensive, and not generally done for reasons of 'ethics', unless those ethics align with a view to long-term profit (in this case, you'd need at least $1Billion to buy enough of a stake in the DAPL to make a difference). What you may instead want to consider is 'ethical investing'. This refers to the concept that you should only put your investments in companies which act ethically. For example, you could buy shares in a solar company, if you felt that was an ethical industry. In this way, you drive up demand for those types of companies, and reward the business owners who act in that fashion.