Telecommunications stocks were the market's best performers on Tuesday, Sept. 19, as reports of deal talks between T-Mobile US Inc. (TMUS) and Sprint Corp. (S) triggered a rally. 

The reportedly serious talks would be the latest in a years-long courtship. According to CNBC sources, T-Mobile parent company Deutsche Telecom (DTEGY) would emerge as the majority owner if the United States' third- and fourth-largest mobile carriers did complete a stock-for-stock merger. 

Sprint shares surged more than 6%, while T-Mobile added nearly 5%. 

Other telecoms were on the rise, too, including AT&T Inc. (T) , Verizon Communications Inc. (VZ) , Vodafone Group PLC (VOD) , and Telefonica S.A. (TEF) . The iShares Dow Jones U.S. Telecom ETF (IYZ) added more than 1%.

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