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- M. Arthur Gensler Jr. and Associates
- M. W. Kellogg Co.
- M.A. Hanna Co.
- M/A/R/C Group
- MacLean-Fogg Co.
- Madison Mutual Insurance Co.
- Maguire Oil Co.
- Mallinckrodt Inc.
- Marathon Oil Co.
- March & McLennan Cos. Inc.
- Maritz Inc.
- Marley Co.
- Massachusetts Financial Services Investment
- Massachusetts Mutual Life Insurance Co.
- Massachusetts Port Authority
- MasterCard International Inc.
- Mattel Foundation
- Mattel Inc.
- Maxus Energy Corp.
- May Department Stores Co.
- May Department Stores Co. Foundation
- Maytag Corp.
- Mazda (North America) Inc.
- McCormick & Co. Inc.
- McDonald's Corp.
- McGraw-Hill Cos.
- McKesson HBOC Inc.
- McKnight Foundation
- McQuay Inc.
- Mead Corp.
- Mebane Packaging Corp.
- Medical Consultants Network Inc.
- Medtronic Inc.
- Mellon Financial Corp.
- Menasha Corp.
- Merck & Co. Inc.
- Meredith Corp.
- Meridian Insurance Co.
- Merit Oil Corp.
- Merrill Lynch & Co. Inc.
- Merrill Lynch and Co Foundation Inc
- Metropolitan Life Insurance Co.
- Mettler-Toledo Inc.
- Microsoft Corp.
- Midland Life Insurance Co.
- Miehle-Goss-Dexter Inc.
- Milliken & Co.
- Millipore Corp.
- Milton Bradley Co.
- Milwaukee Electric Tool Corp.
- Minerals Technologies Inc.
- Minnesota Life Insurance Co.
- Mississippi Power Co.
- Mitsubishi International Corp.
- Mobil Corp. Retirees
- Mobil Foundation, Inc.
- Moen Inc.
- Monroe Auto Equipment Co.
- Monsanto Co.
- Montana Power Co.
- MONY Life Insurance Co.
- Moody Corp.
- MOOG Inc.
- Morgan Construction Co.
- Morgan Stanley Dean Witter
- Morgan Stanley Dean Witter & Co.
- Morrison & Foerster, LLP
- Mortgage Guaranty Insurance Corp.
- Morton International Inc.
- Motorola Foundation
- Motorola Inc.
- MSI Insurance
- MTS Systems Corp.
- Murphy Oil Corp.
- Mutual of America
- Mutual of Omaha Cos.
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