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| Oakbrook Corporation | Madison |
| Obie Media | Milwaukee |
| O’Connor Enterprises | Germantown |
| Oconomowoc Manufacturing | Oconomowoc |
| Oconomowoc Utilities | Oconomowoc |
| Offer Consulting | Milwaukee |
| Office Copying Equipment, LTD | Milwaukee |
| Office Depot | Brookfield |
| Office Furniture Resources | Milwaukee |
| Office of Business | Madison |
| O’Gara Publishing | Madison |
| Oil Equipment Co, Inc. | |
| Oilgear | Milwaukee |
| Oil-Rite Corporation | Manitowoc |
| Olille Designs LLC | |
| The Olson Company | Waukesha |
| OMCO Group | Mukwonago |
| Omni Tech Corporation | Waukesha |
| O’Neil, Cannon & Hollman, S.C. | Milwaukee |
| The Onion | New York, NY |
| OnlineRecruiter | Menomonee |
| OnMilwaukee.com | Milwaukee |
| Onyx North America | Milwaukee |
| OpenFirst, Inc. | Milwaukee |
| OPI Inc. | Sheboygan |
| Optavia Corporation | Madison |
| Opus North Corporation | Madison |
| Orbis | Oconomowoc |
| Organization Development Consultants | Brookfield |
| Orion Advertising | Madison |
| Oscar Mayer | Madison |
| Oshkosh Truck | Oshkosh |
| Oriel Incorporated | Madison |
| Orion Advertising | Madison |
| OrionWorks | Madison |
| Oscar Mayer | Madison |
| OTCO Inc. | Fond du Lac |
| Otis Elevator Co. | Milwaukee |
| Outlook Group Corp | Neenah |
| Outward Focus | Menomonee |
| Overton Consulting | Mequon |
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| P.A. Staffing Service, Inc. | Milwaukee |
| P.J. Murphy & Associates, Inc. | Milwaukee |
| PackRite | Racine |
| Pacolet International Translation, Inc. | Roscoe |
| Paget Equipment Co. | Marshfield |
| Panaround.Com | Milwaukee |
| Panatrack, Inc. | Delafield |
| Panef Corporation | Milwaukee |
| Panoramic | Janesville |
| PanVera Corporation | Madison |
| Paper Converting Machine Co. | Green Bay |
| PaperChasers Process Service | Milwaukee |
| Paragon Electric Co., Inc. | Two Rivers |
| Park Bank | Madison |
| Park City Insurance Services, Inc. | Merrill |
| Park Towne Corporation | Madison |
| Patch Procucts, Inc. | Beloit |
| Pattern Technologies, Inc. | Hartland |
| The Payroll Company | Madison |
| Pen to Paper Publishing | West Bend |
| Penda Corporaton | Portage |
| The Penworthy Company | Milwaukee |
| PeopleLink Staffing Solutions | Brookfield |
| The Peoples State Bank | Mazomanie |
| Perfect Computing | Madison |
| Performance Freight Systems, Inc. | Milwaukee |
| Perkins Engineering Co. Inc. | Sussex |
| Perlick Corp. | Milwaukee |
| Perry Capital Management, Inc. (PGM) | Milwaukee |
| Perry Masonry | Madison |
| Personal Care Contract Packaging | Saukville |
| Personnel Resources, Inc. | Beaver Dam |
| Perspective Communications, Inc. | Milwaukee |
| Peter Storer & Associates | Mequon |
| Peterson Builders, Inc. | Sturgeon Bay |
| Pfizer Inc. | New York, NY |
| Philadelphia Insurance Co. | Brookfield |
| Phillips Plastics Corp. | Hudson |
| Phillips, Getschow Co. | Oconto Falls |
| Phoenix Consulting | Madison |
| Phoenix Marketing Group, Inc. | Milwaukee |
| Phoenix Products Company, Inc. | Milwaukee |
| Phoenix Technologies, Ltd. | Brookfield |
| Piaskosi & Associates, Attorneys at Law | Bayside |
| Pierce Mfg., Inc. | Appleton |
| Pierce Nucleic Acid Technologies | Milwaukee |
| Pike and Company | Madison |
| Pike Technologies | Madison |
| Pilch Barnet & Associates | Sun Prairie |
| Pillar Industries | Brookfield |
| Pirelli | Madison |
| The Pixel Farm | |
| PKWARE, Inc. | Brown Deer |
| Placement Solutions | Waukesha |
| Placon Corporation | Madison |
| Planet Propaganda | Madison |
| Planning and Design Institute, Inc. | Milwaukee |
| Plastics Engineering Company | Sheboygan |
| Platinum Direct Funding | Wauwatosa |
| Platinum Systems, Inc. | Kenosha |
| Plato Group | Menomonee |
| Plexus Corporation Inc | Neenah |
| Pointe Precision | Stevens Point |
| The Polacheck Company, Inc. | Milwaukee |
| Plato Group | Menomonee |
| Pope Scientific, Inc. | Saukville |
| Port to Print | Madison |
| Potter Lawson, Inc. | Madison |
| Powercom Company | Beaver Dam |
| PPD, Inc. | Middleton |
| Precision Color Graphics, Ltd. | Franklin |
| Precision Metalsmiths, Inc., Midwest Division | Markesan |
| Precision Screw Thread Corp. | Muskego |
| Premier Aluminum, Inc. | Racine |
| Premier Bank | Fort Atkinson |
| Prent Corp. | Janesville |
| Principal Financial | Milwaukee |
| The Printery Inc. | New Berlin |
| Print-Tech Promotional Group | Madison |
| Prism Technical Management & Marketing Services | Germantown |
| Private Industry Council of Milwaukee County | Milwaukee |
| Pro Line Studio | Plover |
| Pro Tech Systems | Allenton |
| Process Displays, Inc. | New Berlin |
| Production Plastics, Inc. | Saukville |
| Professional Communication Systems (PCS) | Menomonee |
| Professional Events | Menomonee |
| Professional Placement Services, L.L.C. (PPS) | Milwaukee |
| The Progressive Magazine | Madison |
| Promega Corp. | Madison |
| PropertyDrive, LLC | Madison |
| Proven Direct | Menomonee |
| PSJ Engineering, Inc. | Milwaukee |
| Psychology for Business | Brookfield |
| PT Publications | Milwaukee |
| Publicity Power Group | Milwaukee |
| Publisher’s Mail Service Inc. | Milwaukee |
| PyraMax Bank | Franklin |
