Tim Cook:

Today we are revising our guidance for Apple’s fiscal 2019 first quarter, which ended on December 29. We now expect the following:

• Revenue of approximately $84 billion
• Gross margin of approximately 38 percent
• Operating expenses of approximately $8.7 billion
• Other income/(expense) of approximately $550 million
• Tax rate of approximately 16.5 percent before discrete items

We expect the number of shares used in computing diluted EPS to be approximately 4.77 billion.

Based on these estimates, our revenue will be lower than our original guidance for the quarter, with other items remaining broadly in line with our guidance.

Share trading was halted today. Follow the headline link to read the rest of the letter. This seems pretty significant news.