| Website | sigmapartners.com |
| Phone | (617) 330-7872 |
| Employees | |
| Founded | 1984 |
| Eighth Fund, 9/07 | $500M |
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 |
| RecycleBank | 11/09 | Unattributed | $28M | 4 |
| Soladigm | 10/09 | Unattributed | $20.7M | 2 |
| Blackwave | 9/09 | Series C | $7M | 3 |
| TradeBeam Holdings | 9/09 | Unattributed | $7M | 6 |
| Oversight Systems | 9/09 | Unattributed | $14.5M | 4 |
| Acquia | 7/09 | Series B | $8M | 2 |
| DocuSign | 5/09 | Series D | $5M | 4 |
| Azuki Systems | 5/09 | Series B | $6M | 2 |
| Virtual Goods Market | 4/09 | Unattributed | $5M | 2 |
| Quantenna | 4/09 | Series C | $14M | 5 |
| Viximo | 4/09 | Unattributed | $5M | 2 |
| R2 Semiconductor | 2/09 | Series A | $2M | 2 |
| WordStream | 1/09 | Series A | $4M | 1 |
| Sharpcast | 1/09 | Series B | $10M | 3 |
| ExaGrid Systems, Inc. | 12/08 | Series D | $12M | 3 |
| AutoVirt | 11/08 | Series B | $4M | 2 |
| Rave Wireless | 11/08 | Series D | $7M | 3 |
| Dexterra | 10/08 | Unattributed | $21.5M | 6 |
| Applied Identity | 10/08 | Series C | $10M | 5 |
| Zetta | 9/08 | Series A | $10.7M | 2 |
| Demandbase | 8/08 | Unattributed | $8M | 3 |
| Replay Solutions | 8/08 | Series B | $11M | 2 |
| ScanCafe | 8/08 | Series B | $4M | 1 |
| Vericept | 7/08 | Unattributed | $8M | 1 |
| YouSendIt | 7/08 | Series C | $14M | 5 |
| OpenSpan | 7/08 | Series C | $13M | 5 |
| iWatt | 7/08 | Series E | $12.4M | 3 |
| Oversight Systems | 7/08 | Series B | $10.2M | 3 |
| Initiate Systems | 6/08 | Unattributed | $26M | 7 |
| Hanger Network In-Home Media | 6/08 | Series B | $10M | 3 |
| oDesk | 6/08 | Series C | $15M | 4 |
| CrownPeak | 6/08 | Series B | $6M | 3 |
| MarketLive | 5/08 | Series E | $20M | 5 |
| Intacct | 4/08 | Unattributed | $15M | 3 |
| EverSpin Technologies | 4/08 | Series A | $20M | 5 |
| Attributor | 4/08 | Series C | $12M | 2 |
| Vlingo | 4/08 | Series B | $20M | 3 |
| RecycleBank | 3/08 | Series B | $30M | 4 |
| Voxify | 2/08 | Series D | $15M | 4 |
| Enkata Technologies | 2/08 | Unattributed | $8M | 2 |
| AutoVirt | 1/08 | Series A | $4.5M | 2 |
| Jellyvision | 1/08 | Series B | $5M | 1 |
| GainSpan | 12/07 | Series B | $7.25M | 6 |
| Acquia | 12/07 | Series A | $7M | 3 |
| Quantenna | 11/07 | Series B | $12.7M | 4 |
| Blackwave | 10/07 | Series B | $16M | 3 |
| DocuSign | 9/07 | Series C | $12.4M | 4 |
| Azuki Systems | 9/07 | Series A | $6M | 2 |
| TradeBeam Holdings | 8/07 | Series C | $29M | 6 |
| Mobius Power | 6/07 | Seed | $4.5M | 3 |
| Intacct | 6/07 | Unattributed | $14M | 3 |
| RecycleBank | 5/07 | Series A | $13.1M | 2 |
| YouSendIt | 4/07 | Series B | $10M | 4 |
| Digital Fuel | 3/07 | Series E | $5M | 4 |
| Dexterra | 2/07 | Unattributed | $36M | 6 |
| Hanger Network In-Home Media | 2/07 | Series A | $8M | 2 |
| Vlingo | 2007 | Series A | $6.5M | 2 |
| Attributor | 12/06 | Series B | $8M | 5 |
| Enkata Technologies | 9/06 | Series D | $4.88M | 3 |
| GainSpan | 9/06 | Series A | $13.4M | 4 |
| oDesk | 9/06 | Series B | $8M | 3 |
| Topio | 6/06 | Series D | $8M | 3 |
| oDesk | 4/06 | Series A | $6M | 2 |
| DocuSign | 4/06 | Series B | $10M | 3 |
| Sharpcast | 3/06 | Series A | $13.5M | 3 |
| Dexterra | 2/06 | Unattributed | $12M | 5 |
| Attributor | 1/06 | Series A | $2M | 5 |
| ExaGrid Systems, Inc. | 3/05 | Series B | $13.5M | 2 |
| Responsys | 4/03 | Unattributed | $9.4M | 6 |
| Responsys | 4/01 | Unattributed | $20M | 4 |
| Zayante | 5/99 | Series B | $1.5M | 1 |
| Zayante | 10/98 | Series A | $3M | 1 |
| Rave Wireless | Series A | 2 | ||
| Rave Wireless | Series B | 3 | ||
| Entellium | Unattributed | $50M | 2 | |
| HiWired | Unattributed | $5M | 2 |
