Shares of telecommunications specialist AT (NYSE: T) popped on Tuesday, climbing as much as 3.3%. As of 1:30 p.m. ET, the stock was still up 2.6%.

The catalyst that sent the telecom stock higher was an upgrade and some positive commentary from a Wall Street analyst.

Wolfe Research analyst Peter Supino upgraded AT stock to outperform (buy) from peer perform (hold) while simultaneously boosting his price target to $21. For those playing along AT home, that suggests potential upside of 25% compared to Monday's closing price.

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Source Fool.com