S3 Ventures

S3 Ventures accounts for 9 tracked companies with verified cap-table data, 9 of which disclose round sizes totalling $997M. The median disclosed raise is $137M, and the largest is Alkami Technology at $225M, ahead of Alleviant Medical ($167M) and Hydrolix ($148M).

The names that recur most often on these portfolio cap tables are S3 Ventures (9 companies), Next Coast Ventures (2 companies), General Atlantic (1 company), MissionOG (1 company), Argonaut Private Equity (1 company), Gilde Healthcare (1 company). By latest disclosed round, the market skews Series B (3), Series C (2), Series E (1), Series D (1).

• Companies tracked: 9
• Disclosed funding total: $997M across 9 companies
• Median disclosed raise: $137M
• Largest raise: Alkami Technology — $225M
• Stage mix: Series B 3 · Series C 2 · Series E 1 · Series D 1
• Most recent dated round: 2026-04-07

Best funded S3 Ventures companies

1. Alkami Technology — $225M (latest: Series E)
2. Alleviant Medical — $167M (latest: Series B)
3. Hydrolix — $148M (latest: Series C)
4. Atmosphere — $143M (latest: Series D)
5. Endovascular Engineering — $137M (latest: Series C)
6. UpEquity — $77M (latest: Series B)
7. Spectrawave — $63M (latest: Series B)
8. Interplay Learning — $24M
9. BrainCheck — $13M (latest: Series A)

S3 Ventures — related firms and companies (52)

• Alkami Technology
• Alleviant Medical
• Hydrolix
• Atmosphere
• Endovascular Engineering
• UpEquity
• Spectrawave
• Interplay Learning
• BrainCheck
• S3 Ventures co-investors 2026
• Investors like S3 Ventures
• Companies backed by S3 Ventures
• Investors like Sutter Hill Ventures
• Investors like Venrock
• Investors like SOSV
• Investors like True Ventures
• Investors like Bessemer Venture Partners
• Investors like GIC
• Investors like Maven Ventures
• Investors like Next47
• Investors like Digital Currency Group
• Investors like Betaworks
• Investors like Headline
• Investors like 500 Global
• Investors like Insight Partners
• Investors like Balderton Capital
• Investors like SoftBank Vision Fund
• Investors like boldstart ventures
• Investors like Fika Ventures
• Investors like ARCH Venture Partners
• Investors like DCVC
• Investors like Matrix
• Investors like Felicis
• Investors like General Catalyst
• Investors like Coinbase
• Investors like HSG
• Investors like Motivate Venture Capital
• Investors like Western Technology Investment
• Investors like Maveron
• Investors like Founder Collective
• Investors like Slow Ventures
• Investors like SV Angel
• Investors like Vine Ventures
• Investors like Ridge Ventures
• Investors like Alexandria Venture Investments
• Investors like Techstars Ventures
• Investors like Notable Capital
• Investors like Sapphire Ventures
• Investors like Liquid 2 Ventures
• Investors like Canaan Partners
• Investors like Andreessen Horowitz
• Investors like Altos Ventures

S3 Ventures alternatives · All research reports