Dec 18 (Reuters) - Wall Street's main indexes opened

flat Wednesday, as investors turned cautious ahead of the

Federal Reserve's final rate decision of the year and awaited

signals on whether policymakers will take a more cautious stance

in 2025.

The Dow Jones Industrial Average rose 9.8 points, or

0.02%, at the open to 43,459.72. The S&P 500 fell 3.0

points, or 0.05%, to 6,047.65​, while the Nasdaq Composite

rose 5.9 points, or 0.03%, to 20,114.982.