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Why and why would/wouldn't a company split their stock?
From Investopedia, A stock split is usually done by companies that have seen their share   price increase to levels that are either too high or are beyond the   price levels of similar companies in their sector. The primary motive   is to make shares seem more affordable to small investors even though   the underlying value of the company has not changed. From Wikipedia, It is often claimed that stock splits, in and of themselves, lead to   higher stock prices; research, however, does not bear this out. What   is true is that stock splits are usually initiated after a large run   up in share price...stock splits do increase the liquidity of a stock;   there are more buyers and sellers for 10 shares at $10 than 1 share at   $100. Some companies have the opposite strategy: by refusing to split   the stock and keeping the price high, they reduce trading volume.   Berkshire Hathaway is a notable example of this. Something more to munch on, Why Warren Buffett Is Against Stock Splits.