| Link | MacroGen | | | BioMicro Systems, Inc | 1 | | |
| Matsushita/Panasonic | Cupertino | California | EmWare | 1 | $430,000 | |
 | Mayfield Fund | Menlo Park | | Cemaphore Systems, Inc | 1 | | Communications Content & Media Information Services Hardware Software Storage Medical Devices |
| MBW Management, Inc. | Los Altos | California | IOMED, Inc. | | | |
| Link | Mckenna Ventures | | | LignUp | 1 | | Information Services Energy |
| Link | McKinsey & Company | New York | New York | Campus Pipeline | | | |
| Link | MDS Capital | Cambridge | | Cognetix, Inc. | 1 | | Medical Devices |
| Link | Medicus Venture Partners | Menlo Park | California | SmartTalk | | | Biotechnology |
| Link | Medtronic Sofamor Danek | | | Axial Biotech, Inc. | 1 | $1,270,000 | Biotechnology Electronics Healthcare Services |
| Link | Mercato Partners | Salt Lake City | | Cymphonix, MediConnect Global, SkullCandy | 3 | $11,000,000 | Information Services Electronics Software Internet |
| Link | Meritech Capital Partners | Palo Alto | California | Campus Pipeline | 1 | $4,510,000 | Information Services Electronics Software Storage Medical Devices Security |
| Mesa Verde Venture Partners | San Diego | California | | 1 | $2,250,000 | Biotechnology Medical Devices |
| Link | Milestone Venture Partners | New York | New York | Forum Systems | | | Information Services Healthcare Services Software Research |
| Link | Millennium Technology Ventures | New York | New York | Phobos Corporation | 1 | $2,000,000 | |
| Link | Mirant Capital Management | Atlanta | Georgia | Phonex Broadband Corporation | 1 | $3,500,000 | |
| Link | MK Global Ventures | Northbrook | Illinois | First Choice Solutions | 1 | $1,140,000 | |
| Link | Mobius Venture Capital | Superior | Colorado | | 1 | $5,390,000 | Communications Content & Media Information Services Electronics Software Services |
| Link | Mohr Davidow Ventures | Menlo Park | California | | | | Biotechnology Information Services Electronics Software Services Energy |
 | Monarch Partners | | Utah | Allegiance, Inc, Altiris Inc., Cymphonix, Logoworks, Inc, Omniture Inc, SkullCandy, The Generations Network, ZenPrint, Zonder | 10 | | |
| MorAmerica Capital | Cedar Rapids | Iowa | Phonex Broadband Corporation | | | |
| Link | Morgenthaler Ventures | Menlo Park | California | Sonic Innovations | 1 | $150,000 | Biotechnology Communications Electronics Software Services Medical Devices |
| Link | Motorola Ventures | Schaumburg | Illinois | EmWare, Lineo, Inc., Viewpoint Datalabs International Inc. | 1 | $4,800,000 | Communications Content & Media Information Services Electronics Software Energy |
| Link | MPM Capital | Boston | Massachusetts | Sonic Innovations | | | Biotechnology Medical Devices |
| Link | Munder Capital Management | Birmingham | Michigan | Mainstream Data, Inc | | | |
| MVC Capital | | | | 1 | $1,000,000 | |
|