| Website | sigmapartners.com |
| Phone | (617) 330-7872 |
| Employees | |
| Founded | 1984 |
Sigma Partners is a venture capital firm, founded in 1984, that has invested in over a hundred early stage companies and has over $2 billion under management.
In 2007, it raised $500 million for its most recent fund, named Sigma Partners 8.
| Company | Date | Round | Size | Participants |
| YouSendIt | 7/08 | Series C | $14M | 5 |
| oDesk | 6/08 | Series C | $15M | 4 |
| MarketLive | 5/08 | Series E | $20M | 5 |
| Attributor | 4/08 | Series C | $12M | 2 |
| Vlingo | 4/08 | Series B | $20M | 3 |
| Jellyvision | 1/08 | Series B | $5M | 1 |
| Acquia | 12/07 | Series A | $7M | 3 |
| Quantenna | 11/07 | Series B | $12.7M | 4 |
| Acinion | 10/07 | Series B | $16M | 3 |
| DocuSign | 9/07 | Series C | $12.4M | 4 |
| Azuki Systems | 9/07 | Series A | $6M | 2 |
| Intacct | 6/07 | Unattributed | $14M | 3 |
| YouSendIt | 4/07 | Series B | $10M | 5 |
| Attributor | 12/06 | Series B | $10M | 5 |
| oDesk | 9/06 | Series B | $8M | 3 |
| DocuSign | 4/06 | Series B | $10M | 3 |
| oDesk | 4/06 | Series A | $6M | 2 |
| Sharpcast | 3/06 | Series A | $13.5M | 3 |
| Vlingo | Series A | $6.5M | 2 | |
| Attributor | Series A | $10M | 5 |
