Foundations that GrantsWire editors track closely for grant opportunities:

3M Foundation
A.L. Mailman Family Foundation
Abbott Laboratories Fund
Abell-Hanger Foundation
Ahmanson Foundation
Alabama Power Foundation, Inc.
Alcoa Foundation
Alfred P. Sloan Foundation
American Dental Association Foundation
American Express Foundation
American Legion Child Welfare Foundation
AmerUs Group Charitable Foundation
Amgen Foundation, Inc.
Andrew W. Mellon Foundation
Angelica Foundation
Annenberg Foundation
Annie E. Casey Foundation
Arcus Foundation
Arizona Community Foundation
Arthur B. Schultz Foundation
Arthur M. Blank Family Foundation
ASCAP Foundation
AT&T Foundation
Ave Maria Foundation
Aventis Pharmaceuticals Health Care Foundation
AVI CHAI Foundation
AVON Foundation
Baltimore Community Foundation 
Bank of America Charitable Foundation, Inc.
Barr Foundation 
Bayer Foundation 
Beaumont Foundation of America 
Beim Foundation 
Ben & Jerry's Foundation, Inc. 
Bernice Barbour Foundation, Inc. 
Bill and Melinda Gates Foundation 
Blandin Foundation
Blue Mountain Community Foundation 
Boehringer Ingelheim Cares Foundation, Inc. 
Boeing Company Charitable Trust 
Boston Foundation, Inc. 
BP Foundation, Inc. 
Bristol-Myers Squibb Patient Assistance Foundation, Inc. 
Broad Foundation 
Brown Foundation, Inc. 
Burroughs Wellcome Fund
Bush Foundation
California Community Foundation
California Endowment
California Wellness Foundation
Cargill Foundation
Carnegie Corporation of New York
Caterpillar Foundation
Central Indiana Community Foundation, Inc.
Charles Stewart Mott Foundation
Chattanooga Christian Community Foundation 
Chicago Community Trust
Cisco Systems Foundation
Citigroup Foundation
Cleveland Foundation
Clorox Company Foundation
Coca-Cola Foundation, Inc.
Columbus Foundation and Affiliated Organizations
Communities Foundation of Texas, Inc.
Community Foundation for Greater Atlanta, Inc.
Community Foundation for the National Capital Region
Community Foundation of Greater Birmingham
Community Foundation of Greater Greensboro
Community Foundation of Middle Tennessee, Inc.
Community Foundation of Tampa Bay
Community Foundation Silicon Valley
Conrad N. Hilton Foundation
CVS/pharmacy Charitable Trust, Inc.
eBay Foundation 
Edna McConnell Clark Foundation
Educational Foundation of America
Eli Lilly and Company Foundation
Enterprise Foundation
Enterprise Rent-A-Car Foundation
Entertainment Industry Foundation 
Evelyn and Walter Haas, Jr. Fund
Ewing Marion Kauffman Foundation
ExxonMobil Foundation
Fannie Mae Foundation
Federated Department Stores Foundation 
Fidelity Foundation
Fieldstone Foundation
Fleishhacker Foundation 
Ford Foundation
Ford Motor Company Fund
Foundation for the Carolinas
Frank Stanley Beveridge Foundation 
Freddie Mac Foundation
Freedom Forum, Inc.
Fund for Wild Nature
Gannett Foundation
Gap, Inc. 
GE Foundation
Genentech Access To Care Foundation
General Mills Foundation
General Motors Foundation, Inc.
George Gund Foundation
Georgia Power Foundation, Inc.
Geraldine R. Dodge Foundation
Gladys Krieble Delmas Foundation
Glaser Progress Foundation 
Goldman Sachs Foundation
Gordon and Betty Moore Foundation
Grand Victoria Foundation
Greater Houston Community Foundation
Greater Kansas City Community Foundation
Hall Family Foundation
Harry and Jeanette Weinberg Foundation, Inc.
Hartford Foundation for Public Giving
HCA Foundation
Heinz Family Foundation
Henry Luce Foundation, Inc.
Highmark Healthy High 5
Home Depot Foundation
Houston Endowment Inc.
Howard Heinz Endowment
HRK Foundation
Humana Foundation, Inc.
IBM International Foundation
Independence Community Foundation
Intel Foundation
Iris & B. Gerald Cantor Foundation 
J. Bulow Campbell Foundation
J. E. and L. E. Mabee Foundation, Inc.
Jack Kent Cooke Foundation
James Irvine Foundation
Jay and Rose Phillips Family Foundation
John A. Hartford Foundation, Inc.
John D. and Catherine T. MacArthur Foundation
John Deere Foundation 
John S. and James L. Knight Foundation
John Templeton Foundation
Johnson & Johnson Family of Companies Contribution Fund
Joyce Foundation
JPMorgan Chase Foundation
Kenneth T. and Eileen L. Norris Foundation
Kresge Foundation
Lance Armstrong Foundation
Lannan Foundation 
Lenfest Foundation, Inc.
Levi Strauss Foundation
Lilly Cares Foundation, Inc.
Lilly Endowment Inc.
Lucille Lortel Foundation, Inc.
Lumina Foundation for Education, Inc.
Lynde and Harry Bradley Foundation, Inc.
M. J. Murdock Charitable Trust
Maddie's Fund 
Make-a-Wish Foundation of America
Manatee Community Foundation, Inc.
Mardag Foundation
Marguerite Casey Foundation
Marin Community Foundation
Mattel Children’s Foundation
MBNA Foundation
McCune Foundation
McKnight Foundation
Meadows Foundation, Inc.
Medtronic Foundation
Merck Company Foundation
Merck Patient Assistance Program, Inc.
MetLife Foundation
Michael and Susan Dell Foundation
Micron Technology Foundation, Inc.
Minneapolis Foundation
Moody Foundation
Motorola Foundation
Natinal Fish and Wildlife Foundation
National Dairy Council
National Film Preservation Foundation
National Fish and Wildlife Foundation
National Foundation for Advancement in the Arts 
Nationwide Foundation
NCC Charitable Foundation
NEC Foundation of America
Nevada Community Foundation, Inc.
New York Community Trust
New York Life Foundation
Northwest Area Foundation 
Omaha Community Foundation
Open Meadows Foundation
Open Society Institute
Oregon Community Foundation
Oshkosh Area Community Foundation
Packard Humanities Institute
Pay It Forward Foundation
Peninsula Community Foundation
PepsiCo Foundation, Inc.
PetSmart Charities, Inc. 
Pew Charitable Trusts 
Pfizer Foundation, Inc.
Pittsburgh Foundation
Planet Dog Foundation
Princess Grace Foundation – U.S.A.
Procter & Gamble Fund
Prudential Foundation
Richard King Mellon Foundation
Robert A. Welch Foundation
Robert R. McCormick Tribune Foundation 
Robert Sterling Clark Foundation, Inc.
Robert W. Woodruff Foundation, Inc.
Robert Wood Johnson Foundation
Roche Patient Assistance Program
Rockefeller Brothers Fund, Inc.
Rockefeller Foundation
Ronald McDonald House Charities 
Royal Caribbean Cruises’ Ocean Fund
Saint Paul Foundation, Inc.
Samuel Roberts Noble Foundation, Inc.
San Diego Foundation
San Francisco Foundation
Sara Lee Foundation 
Saucony Run for Good Foundation
Save Our History
Scripps Howard Foundation
Seattle Foundation
Share Our Strength
Shell Oil Company Foundation
Sprint Foundation
Staples Foundation for Learning
Starlight Starbright Children's Foundation
Starr Foundation
State Farm Companies Foundation
Steelcase Foundation
Stockton Rush Bartol Foundation
Summerlee Foundation
Surdna Foundation, Inc.
Target Foundation
Texas Instruments Foundation
Textron Charitable Trust
Thrivent Financial for Lutherans Foundation
Time Warner Foundation
Tulsa Community Foundation
U.S. Bancorp Foundation, Inc.
U.S. Soccer Foundation
Union Pacific Foundation
UPS Foundation
Verizon Foundation
W. M. Keck Foundation
W.K. Kellogg Foundation
Wachovia Foundation,Inc.
Wallace Foundation
Wal-Mart Foundation
Walton Family Foundation, Inc.
Wayne & Gladys Valley Foundation
Weingart Foundation
WellPoint Foundation
Wells Fargo Foundation
Whirlpool Foundation
William and Flora Hewlett Foundation
William Penn Foundation
William Randolph Hearst Foundation