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Why buy stock of a company instead of the holding company who has more than 99% of the stocks
In a situation like this, I presume you'd invest in the child company if you thought that the child company would increase in value at a higher rate than the parent. You'd invest in the parent company if you thought the parent company would perform well as a whole, but you did not want to assume the risk of an individual company underneath it. Say the child company is worth 100 million, and the parent company is worth 500 million. You've invested a sum of money in the child company. The child company performs very well, and increases in value by, say, 20 million. As the parent company owns the child, we could say it also increases in value by roughly 20 million. The difference is proportional - Your investment in the child sees a 20% gain in value, whereas your investment in the parent sees a 4% gain in total value, as in this example the parent company, which owns nearly 100% of the child company, is worth 5x more and thus proportionally sees 1/5 the increase in value, due to it being worth more as a whole. Think of it similarly to a mutual fund or ETF that invests in many different stocks on the market. As the market does well, that mutual fund or ETF does well, too.  As the mutual fund is made up of many individual stocks, one stock performing very well, say at a 10-20% increase in value, does not raise the value of the ETF or mutual fund by 10-20%. The etf / mutual fund will perform slightly better (Assuming all other components remain equal for this example), but only proportionally to the fraction of it that's made up of the stock that's performing well.