The Dow Jones Industrial Average (DJINDICES:^DJI) is moving lower today. As of 12:30 p.m. EDT, the index is down 17.70 points, or 0.13%, to 13,560. After last week ended with a four-day winning streak, this week has been mixed -- up for half the day and down the next, or vice versa, with no major market moving news. Of the 30 components that form the Dow, 16 are currently trading lower. Three of the biggest movers are Bank of America (NYSE:BAC), Alcoa (NYSE:AA), and Caterpillar (NYSE:CAT)

So why are they down?
First, the largest banking employer in the U.S. will change hands by the end of the year. Bank of America is planning to reduce its workforce by 16,000 employees in an attempt to make up for lost revenue. The economy, market conditions, and new regulations have been cited as reasons for the bank's declining income. Bank of America is currently down by 0.81%, and fellow Dow banking stock JPMorgan is lower by 0.87%.

Aluminum producer Alcoa is down by 2.22%. The Italian government has been notified that two more groups are interested in Alcoa's Sardinian plant. The plant, which has threatened to close and put 500 workers out of a job, has now attracted six potential buyers. The number of buyers could be indicating that Alcoa is making a mistake in selling the plant or that the price is way to low. While investors are beating up the stock today, the number of interested parties in the plant could help bring a higher price if a bidding war begins.

Finally, Caterpillar is inching downward, now 1.46% lower for the session. New fears of a global slowdown are again the cause for the slide. Data from China, Japan, and Europe all point to the world economy contracting. A Chinese manufacturing survey shows the industry has now shrunk 11 straight months, and European services and manufacturing are now at a 39-month low. Furthermore, exports from Japan have also seen declines in August.

Fool Contributor Matt Thalman owns shares of Bank of America. The Motley Fool owns shares of Bank of America. The Motley Fool has a disclosure policy. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. Try any of our Foolish newsletter services free for 30 days.