The following companies are involved with the 2009 U.S. Senior Open. Companies are listed in alphabetical order.

ACES Power Marketing

American Express

Anthem Blue Cross and Blue Shield

Baker & Daniels

Barnes & Thornburg

Brightpoint

Browning Investments

Centaur Inc.

Clarian Health Partners

Comcast

Conseco

Cripe Architects + Engineers

CSO Architects

Duke Energy

Duke Realty Corporation

Eli Lilly and Company

French Lick Casino-Resort

Hamilton County CVB

HP Products

Indiana Golf Foundation

Katz Sapper & Miller

Kroger

Lexus

Merrill Lynch

Mi-Tech Metals

Monarch Beverage

National City Bank Private Client Group

National Wine & Spirits

Old National Bank

OneAmerica

SM&P Utility Resources

St. Vincent Health

WTHR

Zachary Confections