International stocks trading in New York were mixed Monday. The BNY Mellon index of American depositary receipts edged up 0.85% to 142.56. The European index increased 1.1% to 139.99, the Asian index improved 0.6% to 147.33, the Latin American index fell 0.6% to 232.32 and the emerging markets index edged down 0.07% to 274.56. Among the companies with shares that actively traded was America Movil SAB (AMOV, AMX, AMX.MX).

America Movil shares declined as AT&T (T) agreed to buy Nextel Mexico for $1.88 billion, potentially putting the U.S. giant out of the race for AMX wireless assets that America Movil plans to sell there after AT&T's recent deal for Iusacell. AMX is seeking to sell assets to cut its market share to less than 50%, thereby avoiding stiff regulations as the dominant carrier. America Movil shares fell 2.8% to $22.86.

BP PLC (BP, BP.LN) Chief Executive Bob Dudley told staff in a Monday memo that the oil major would freeze 2015 base pay, part of a larger round of cost savings the company has undertaken as oil prices remain at less-than-half the level of mid-2014, a BP spokesman said. Shares rose 2.6% to $39.92.

Write to Tess Stynes at tess.stynes@wsj.com

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