Berkshire Hathaway continued its purchases of Verisign in recent days, buying about $4 million of the company that provides Internet domain registry and other services. The small recent buys, approximately 20,

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This was the stock's third consecutive day of gains.

For decades, Berkshire Hathaway's stock was only available through over-the-counter markets. But on Nov. 29, 1988, it listed what are now known as its Class A shares on the New York Stock Exchange. In his shareholder letter that year, Buffett said his main motivation was minimizing investors' transaction costs.