If you had to choose a stock for the investing hall of shame over the last decade, AT (NYSE: T) would be a good candidate.

It's made two of the worst acquisitions of this century, spending more than $100 billion combined for DirecTV and Time Warner and paying a peak price for two vestiges of the traditional pay-TV ecosystem that were already showing signs of decline.

As for its core phone business, the company struggled to grow revenues and has lost market share to more nimble competitors like T-Mobile. As a result, the stock hit a 30-year low earlier this year. 

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Source Fool.com