Regulatory antitrust hurdles to mergers and acquisitions are increasing globally, and more so for some technology companies. Companies that are considering a multijurisdictional tie-up—and their outside counsel—need to consider antitrust issues very early in the transaction now, attorneys said. Here are six big obstacles that lawyers are talking about:

1. Antitrust regulators worldwide are heavily scrutinizing tech companies.

Technology companies such as Facebook, Alphabet and Amazon have come under the microscope of antitrust regulators lately, and especially in Germany, Australia and the European Commission, in addition to the United States.