These are the 5 reasons why Apple is having its worst month since the 2008 financial crisis - and one reason you can still be bullish

• Apple stock is on pace to have its worst month since 2008, dropping 21% and wiping out over $200 billion in value.
• In fact, it briefly lost its crown as the most valuable U.S. company to Microsoft this week.
• Here's why investors have been so negative on Apple lately.

Apple stock is having a terrible month.

Although it's still up just under 3% on the year, it's been deeply slumping since November 1, dropping 21% during this month, wiping out over $200 billion in value. That was when Apple said that it would not longer reveal how many iPhones it sells in a given quarter, leading analysts to speculate that unit sales were going to start trending downwards.

That's been a big contributor to the rout. In fact, for a short period of time during trading on Monday and Tuesday, Apple briefly lost its crown as the most valuable U.S. company - to Microsoft!

Ultimately, it's all shaping up to be Apple's worst month since 2008, during the financial crisis.

There are a lot of reasons why Apple's in a slump. Let's break them down:

Get the latest Microsoft stock price here.