There's no hard-and-fast rule for when stocks split. Some companies split their stock at relatively low prices, while others split after the price passes the $100 mark. Some rarely split, trading well into the triple digits, including shares of Washington Post (NYSE:WPO). Superinvestor Warren Buffett's Berkshire Hathaway (NYSE:BRK-A) (NYSE:BRK-B) sports A-class shares that recently topped $110,000 each. (B-class shares are merely in the $3,500 range.) Stocks might be split simply to increase the number of shares outstanding, or perhaps to meet a stock exchange requirement.

Where can you find out about a company's recent stock splits?

One good source is the horse's mouth. Call the company's investor relations department and ask. Here in cyberspace, drop by our Quotes area, where you can look up a stock's price chart, historical prices, and split information.

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Longtime Fool contributor Selena Maranjian owns shares of Berkshire Hathaway, a Motley Fool Inside Value pick. The Fool has a disclosure policy.