
Oak Investment Partners is a multi-stage venture capital firm founded in 1978, headquartered in Wilton, Connecticut. The firm invests across the entire venture capital spectrum—from early-stage through growth equity and PIPE investments—in sectors including Information Technology, Internet & Consumer, Financial Services Technology, Healthcare Information & Services, and Clean Energy.
Average disclosed round size is $43.1M (across 118 rounds with reported amounts).
Portfolio
78
Fund Size
—
Top Stage
Unknown
Last 12 Mo
0
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
127 investments
| Company | Round | Amount | Date |
|---|---|---|---|
| Series C | $36M | Jul 2022 | |
| Growth | $230M | Oct 2021 | |
| Series E | $80.8M | Aug 2021 | |
| Growth | $50M | Jul 2021 | |
| Unknown | $90M | Sep 2019 | |
| Growth | $50M | Jul 2019 | |
| Series B | $43M | Jul 2017 | |
| Series C | $15M | May 2017 | |
| Growth | $21M | Feb 2017 | |
| PPrecision Medicine Group | Growth | $275M | Jan 2017 |
| Growth | $21M | Jan 2017 | |
| Series G | $40M | Nov 2016 | |
| Series E | $40M | Jan 2016 | |
| Series E | $31M | Jan 2016 | |
| NNowThis | Series D | $16.2M | Dec 2015 |
| GGiosis | Series A | $82.1M | Jul 2015 |
| Series A | $82.1M | Jul 2015 | |
| Series B | $3.5M | Jun 2015 | |
| Series B | $20M | Jun 2015 | |
| Series D | $14M | Apr 2015 | |
| Seed | $3.6M | Mar 2015 | |
| Unknown | $3.6M | Jan 2015 | |
| Series C | $50M | Jan 2015 | |
| GGiosis | Series A | $82.1M | Jan 2015 |
| Series C | $20M | May 2014 |
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Top Co-Investors
Venrock8 shared
Accel7 shared
New Enterprise Associates6 shared
Intel Capital5 shared
Hercules Capital, Inc.5 shared
SoftBank Vision Fund4 shared
Ebay4 shared
SoftBank Group Corp.4 shared
Redpoint Ventures4 shared
The Goldman Sachs Group, Inc.4 shared
General Catalyst3 shared
Accomplice3 shared
Gaingels3 shared
Bain Capital Public Equity3 shared
Saban Capital Group3 shared
Notion Capital3 shared
Passion Capital3 shared
Benchmark3 shared
Maverick Ventures3 shared
Last updated: 20 October 2026