The Dow Jones Industrial Average (^DJI -0.98%) may not be repeating its historic 23% drop today, but the index is rapidly moving lower today. As of 12:30 p.m. EDT the index is at 13,384, down 164 points, or 1.22%. Only one Dow component is higher for the day: Bank of America, which is also the best-performing stock for the year in the Dow 30, up more than 70%.

Needless to say, it's not hard to find a few Dow stocks moving lower today, but the most important question is why they're dropping.

So what's the story?
The easy answer is that these companies are down because of lackluster earnings. General Electric (GE 1.30%) and McDonald's (MCD -0.42%) are seeing their shares drop by 3.11% and 3.8%, respectively, after missing analyst estimates. General Electric met analyst expectations of $0.36 per share earnings but missed on revenue, only bringing in $36.35 billion where Wall Street wanted to see $36.95 billion.

McDonald's, on the other hand, saw income fall to $1.43 per share, while analysts were expecting $1.47 per share. While McDonald's saw same-store sales rise by 1.9%, it was the first time since 2003 in which that number grew less than 2%. The company is facing strong year-over-year comparisons, which can be blamed for part of the slowdown. But regardless, investors were not happy, and the company's share price has taken a hit.

Finally, Caterpillar (CAT -7.02%) reported a 6% increase in worldwide equipment sales, but that increase slowed dramatically in all markets. Asia-Pacific sales posted the best numbers, rising 14% in September, but that's down from a 27% increase in August and a 28% rise in July. In North America, sales grew 16% in September, versus 24% in August and 25% in July. Europe, Africa, the Middle East, and Latin America were all either flat or down for the month. Shares of the company are moving lower by 3.01%.