International stocks trading in New York were mixed on Monday.

The BNY Mellon index of American depositary receipts rose 0.34% to 151.81. The European index increased 0.31% to 147.18, the Asian index improved 0.52% to 163.56, the Latin American index fell 0.26% to 237.07 and the emerging markets index increased 0.65% to 285.23. Teva Pharmaceutical Industries Ltd. (TEVA, TEVA.TV) was among the companies with ADRs that traded actively.

Teva's ADRs fell 4.3% to $61.63 after Mylan NV said its board unanimously rejected Teva's unsolicited bid, the latest move in a three-way tussle as the generic-drug industry faces challenges from slowing growth. Separately, Teva reiterated its commitment to its Mylan offer, valued at $82 a share, and said it was prepared to "devote all necessary resources" to complete the proposed deal. Mylan also said it remains committed to its offer for Perrigo Co., which some have seen as an effort to prevent a potential purchase by Teva.

ADRs of BP PLC (BP, BP.LN) fell nearly 1% to $43.04 following a report in the Financial Times that said the U.K. government had told BP that it wants the oil giant to remain a British company with global clout and that it would be against a takeover by a foreign entity. The U.K. government's pre-emptive opposition to any potential foreign takeover of BP is just the latest sign that Britain is becoming more hostile to foreign takeovers.

ADRs of HSBC Holdings PLC (HSBC, HSBA.LN, 0005.HK) rose 3.7% to $49.48 on Monday following reports in the Sunday Times over the weekend that HSBC is mulling a spinoff of its U.K. retail banking operations. Separately HSBC on Friday said it was reviewing whether to move its headquarters outside the U.K., a high-stakes decision that comes as the bank faces tighter regulatory scrutiny and higher taxes in the country. The lender has large Asian operations but is based in London.

ADRs of Deutsche Bank AG (DB, DBK.XE) fell 4.9% to $32.61 after the German lender released details of its long-awaited strategic overhaul that aims to close the gap with rivals for profitability and capital adequacy. Deutsche Bank said it would scale back at its investment banking and retail operations while strengthening transaction banking as well as asset and wealth management services. The bank also cut a profitability target after reporting over the weekend that its first-quarter profit fell about 50%. Separately, U.S. securities regulators said they need another two weeks to decide whether Deutsche Bank should be able to continue issuing stocks and bonds without regulatory review, the latest hiccup for a firm seeking a Securities and Exchange Commission "waiver" after settling an enforcement case.

ADRs of PetroChina Co. (PTR, 0857.HK, 601857.SH, K3OD.SG) rose 3.3% to $134.30 after the listed unit of China National Petroleum Corp. said its hasn't received any information from the government about a possible planned merger with Sinopec Group after market chatter of consolidation of the big state-owned enterprises. PetroChina also reported that its first-quarter profit slumped 82%, largely because of the sharp decline in oil prices. Petrochina, one of the world's largest oil companies by market value, said its oil and gas output rose 4.9% year-on-year, while pointing out it had continued to reduce costs. ADRs of Sinopec's subsidiary, China Petroleum & Chemical Corp. (SNP, 0386.HK, 600028.SH) rose 3.5% to $94.98.

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

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