Here is the rundown of the top 10 advertising agencies that made significant mark in the advertising business and has pioneered the known best practices in the advertising industry.

1. BBDO Worldwide, United States
BBDO Worldwide is one of the major three networks under the umbrella of Omnicom. BBDO Worldwide has long been recognized as the most prestigious advertising network globally. Its estimated total revenues for 2008 amount to $2.0B.

2. McCann Erickson, United States
McCann Erickson is the largest agency with global coverage. Its main business focuses on traditional advertising operations. It also offers a range of innovative marketing services under the umbrella company known internationally as McCann Worldgroup. Its estimated total revenues for 2008 amount to $1.7 B.

3. DDB Worldwide, United States
DDB is one of the triumvirate networks under the portfolio of Omnicom. It maintains a lower profile compared to the other two networks that form the triumvirate network of Omnicom. Its estimated revenues for 2008 are at $1.5 B.

4. TBWA Worldwide, United States
TBWA Worldwide completes the triumvirate of networks under the Omnicom advertising group. It is more on the non-traditional lines and usually dabbles on the “quirky” side of the business. Its total revenues for 2008 are estimated to have reached $1.4 B.

5. Euro RSCG Worldwide, France
Euro RSCG Worldwide is one of the two major advertising agencies in France. Its global reach covers about 75 countries. After growing through some organizational challenges, Euro RSCG Worldwide returned to the global scene under a new management group and immediately earned recognition in major publication in the UK and the US. Its estimated 2008 revenues are placed at $1.2 B.