Arthur Ventures is an early growth capital firm that primarily invests in B2B software companies located across the U.S. and Canada, outside of Silicon Valley. The firm's strategy involves leading investments and partnering closely with portfolio companies to provide strategic guidance and operational support for scaling their businesses.
36% of their portfolio is in Cybersecurity. Deal activity increased 300% year-over-year (4 deals in the last 12 months). Average disclosed round size is $25.4M (across 20 rounds with reported amounts).
Portfolio
22
Fund Size
$1.5B
Top Stage
Series A
Last 12 Mo
4
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
22 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Handl Health | Series A | $14M | Feb 2026 |
 Circadian Risk | Series A | $6M | Feb 2026 |
 Nucleus Security | Series C | $20M | Feb 2026 |
 PKI Solutions | Unknown | — | Dec 2025 |
| Nucleus Security | Unknown | — | Aug 2024 |
| Nucleus Security | Series B | $43M | Feb 2024 |
| PPayroll Integrations | Series A | $20M | Nov 2023 |
 CertifID | Series B | $20M | Sep 2023 |
 Zartico | Series A | $20M | Sep 2022 |
 Athennian | Series B | $33M | Mar 2022 |
| Nucleus Security | Series B | $20M | Mar 2022 |
 DNSFilter | Series A | $30M | Jul 2021 |
 Protenus | Series D | $21M | Jun 2021 |
| Athennian | Series A | $8M | Sep 2020 |
| Protenus | Series C | $17M | Aug 2019 |
 Total Expert | Series B | $20M | Oct 2018 |
 Stensul | Series A | $7M | Jun 2018 |
 Avalara | Growth | $96M | Sep 2016 |
| IInfusionsoft | Series D | $55M | Oct 2014 |
| DDrifty | Seed | $1M | Mar 2014 |
 Corporate Finance Institute (CFI) | Unknown | $48M | — |
| TTJM Labs | Series A | $10M | — |
Top Co-Investors
Lead Edge Capital3 shared
Providence Ventures2 shared
F-Prime Capital2 shared
Kaiser Permanente Ventures2 shared
LionBird Ventures2 shared
In-Q-Tel2 shared
Insight Partners1 shared
Mucker Capital1 shared
Elephant1 shared
MemorialCare Innovation Fund1 shared
Transformation Capital1 shared
Gaingels1 shared
Centana Growth Partners1 shared
Touchdown Ventures1 shared
Bain Capital Ventures1 shared
Signal Peak Ventures1 shared
Goldman Sachs1 shared
Battery Ventures1 shared
Warburg Pincus1 shared
Sageview Capital1 shared
Last updated: 12 April 2026