Apple's global smartphone market share slipped one percentage point to 18% last year as fourth-quarter iPhone sales dropped 5%, according to Counterpoint Research.
Goldman Sachs is set to report fourth-quarter results before the market opens Wednesday, with analysts expecting revenue and net interest income growth.
Constellation Energy shares could remain in focus on Monday after surging more than 25% Friday as the energy giant announced that it will acquire rival Calpine in a deal valued at $26.6 billion.