S3 Ventures
S3 Ventures is an Austin, Texas-based venture capital firm founded in 2005 that invests Seed through Series B in U.S. business technology and healthcare technology startups, managing over $1B in AUM across eight funds with a single philanthropic limited partner.
- Company typePrivate
- Founded2005
- HeadquartersAustin, United States
- Headcount11–50
- GTM typeB2B
- OfferingServices
What S3 Ventures does
S3 Ventures is a venture capital firm headquartered in Austin, Texas, founded in 2005 by Brian Smith. The firm is backed by a single philanthropic limited partner, a structure the firm explicitly cites as enabling patient capital without the fundraising and LP-pressure constraints typical of multi-LP funds. S3 Ventures leads Seed, Series A, and Series B rounds with initial checks of $500,000 to $15 million-plus and reserves the right to invest $25 million-plus over time, operating a single primary office in Austin with a stated geographic reach across 13 U.S. states.
The firm concentrates its portfolio across two verticals: Business Technology (software applications, IT infrastructure, developer tools and platforms, hardware) and Healthcare Technology (medical devices and software across diagnosis, treatment, and wellness). Beyond capital, S3 Ventures supplements portfolio companies with operational resources, including the "Startup Toolbox" of templates and calculators (SaaS Operating Model, Term Loan Calculator, Stagger Charts, Cap Table Template, Unit Economics Workbook) and a founder-facing newsletter. The firm does not operate technology products of its own; its "platform" is the investment and value-add program surrounding its portfolio.
S3 Ventures manages over $1 billion in assets across eight funds, with Fund VIII at $250 million announced in December 2025 coinciding with the firm's 20th anniversary. The firm reports 75-plus startup investments to date, 40-plus currently active portfolio companies, and 35-plus exits collectively valued at over $3 billion. Notable exits include Acessa Health (acquired by Hologic), Briggo (Coca-Cola), Complex (Verizon and Hearst), Favor (HEB), Levelset (Procore), and Gravitant (IBM). The team of 11-50 employees is led by founder and Managing Director Brian Smith alongside Principal Joe Curry and associates.
S3 Ventures firmographics
Firmographics- Name
- S3 Ventures
- Legal name
- S3 Ventures
- Website
- https://S3vc.com
- Company type
- Private
- Founded year
- 2005
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- S3 Ventures is an Austin, Texas-based venture capital firm founded in 2005 that invests Seed through Series B in U.S. business technology and healthcare technology startups, managing over $1B in AUM across eight funds with a single philanthropic limited partner.
- Ownership category
- akta.pro rank
S3 Ventures industry classification
Industry- Product category
- Venture Capital
- akta.pro primary industry
- Early-Stage Venture Capital (Series A/B) (FSANAAAB)
- akta.pro secondary industry
- Sector-Focused Venture Capital (Vertical Specialists) (FSANAAAD)
Keywords
Where S3 Ventures is headquartered
LocationHeadquarters
- HQ city
- Austin
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
S3 Ventures business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Marketing or Sales, Infrastructure
Distribution channels1 record
Marketing channels4 records
S3 Ventures product offering
Product offeringCore offering
S3 Ventures is a venture capital firm that invests patient equity capital in early- to growth-stage technology and healthcare companies, leading Seed, Series A, and Series B rounds with check sizes of $500K to $15M+ initially and $25M+ over time. The firm provides portfolio companies with operational resources, mentorship, and network access, organized around two verticals: Business Technology and Healthcare Technology.
Product overview
S3 Ventures is a venture capital firm headquartered in Austin, Texas, that provides patient capital and strategic resources to early-stage software and healthcare technology companies. Founded in 2005 and backed by a single limited partner, the firm leads Seed, Series A, and Series B rounds with initial investments of $500,000 to $15 million+, with the ability to invest $25 million+ over time. S3 Ventures manages over $1 billion in assets across more than 75 startup investments, with 40+ active portfolio companies and 35+ exits. The firm's investment strategy spans two primary verticals: Business Technology (software applications, IT infrastructure, developer tools, platforms, hardware) and Healthcare Technology (medical devices and software for diagnosis, treatment, and wellness). The firm offers portfolio companies access to a Startup Toolbox containing operational templates, calculators, and frameworks including SaaS Operating Model, Term Loan Calculator, Stagger Charts, Cash Management best practices, Sales Quota Workbook, Sales Forecast Workbook, Cap Table template, Option Grants Workbook, Unit Economics Workbook, and a Starter Kit for Texas Founders.
Differentiator
Problem solved
Functional benefit
Products and services
- S3 Ventures Seed Funding Early-stage equity investment in startup companies, typically the first institutional round of funding, designed to help entrepreneurs build initial product and market traction. S3 Ventures leads Seed rounds with initial investments within its $500K to $15M+ range, targeting Business Technology and Healthcare Technology startups across the U.S.
- S3 Ventures Series A Funding Growth-stage equity investment for startups that have achieved product-market fit and seek capital to scale operations and revenue. S3 Ventures leads Series A rounds with initial investments up to $15M+, supporting Business Technology and Healthcare Technology companies across the U.S.
- S3 Ventures Series B Funding Later-stage growth equity investment for scaling startups, providing larger capital injections to accelerate market expansion, team building, and revenue growth. S3 Ventures leads Series B rounds with initial investments up to $15M+ and the ability to invest $25M+ over time across its portfolio companies.
- S3 Ventures Fund VIII The eighth vintage of S3 Ventures' flagship venture capital fund, capitalized at $250 million and backed by a single philanthropic limited partner. Fund VIII will deploy patient capital into software and healthcare technology startups across the U.S.
- S3 Ventures Startup Toolbox A free resource library offered by S3 Ventures to founders and entrepreneurs, containing operational templates, calculators, and frameworks including the SaaS Operating Model, Term Loan Calculator, Stagger Charts, Cash Management best practices, Sales Quota Workbook, Sales Forecast Workbook, Cap Table template, Option Grants Workbook, Unit Economics Workbook, and a Starter Kit for Texas Founders.
Quantifiable outcome
- Portfolio companies have raised over $3.5B in total
- +1 more outcomes
Companies that use S3 Ventures
Customer profileSegments2 records
Ideal customer profiles2 records
S3 Ventures technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
S3 Ventures partnerships and signals
Strategic signalScale indicators7 records
Recent moves6 records
Expansion highlights5 records
S3 Ventures competitors and assessment
Company assessmentDirect peers
- Foundry Group: Boulder-based early-stage VC investing in B2B software and healthcare with comparable fund size and Seed-to-Series B stage focus. Highly comparable strategy and check-size philosophy.
- LiveOak Venture Partners: Austin-based early-stage VC focused on Texas-based technology startups with similar check sizes and Seed/Series A leadership approach. Highly comparable as a same-geography, same-stage Texas tech investor.
- Next Coast Ventures: Austin-based venture firm investing in Seed and Series A rounds across Texas and the broader US, with comparable fund size and stage focus. Frequently co-invests with S3 Ventures (e.g., BrainCheck, LeanDNA).
- Mercury Fund: Houston-based early-stage VC investing in B2B software and healthcare-adjacent startups across Texas. Same regional orientation and stage focus as S3 Ventures.
- Elsewhere Partners: Austin-based growth-stage VC focused on B2B software companies, with similar check sizes and Texas roots. Overlaps with S3 Ventures on later-stage business-technology opportunities.
- Santé Ventures: Austin-based healthcare-focused VC investing in medical devices and digital health. Highly comparable healthcare vertical focus; co-invested with S3 in Endovascular Engineering.
Broad incumbents
- Norwest Venture Partners: Large multi-stage VC with healthcare and B2B technology focus that co-leads rounds S3 participates in (e.g., Endovascular Engineering). A scaled incumbent operating in the same categories.
- Gilde Healthcare: European-anchored healthcare VC active in US medical device markets; co-led Endovascular Engineering Series C with S3 Ventures. A larger, sector-specialized comparable on the healthcare vertical.
Regional players
- ATX Seed Ventures: Austin-focused pre-seed and seed fund backing local Texas founders. Operates in an adjacent stage to S3's Seed and Series A activity and shares its Austin deal-flow ecosystem.
- Capital Factory: Texas-centered accelerator and seed investor operating in the same Austin startup ecosystem, often funneling Seed-stage companies toward S3 for Series A follow-on.
Market position
Strengths1 record
Weaknesses1 record
Competitive moat5 records
Key risks6 records
Key highlights6 records
Customer concentration
S3 Ventures social profiles
Digital presenceS3 Ventures financial estimates
Financial estimateRevenue estimate
Valuation estimate
S3 Ventures leadership team
Management profileNumber of profiles
Profiles4 records
S3 Ventures funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
S3 Ventures M&A and investment
M&A and investmentM&A
Investments142 records
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about S3 Ventures
What does S3 Ventures do?
S3 Ventures is a venture capital firm that invests patient equity capital in early- to growth-stage technology and healthcare companies, leading Seed, Series A, and Series B rounds with check sizes of $500K to $15M+ initially and $25M+ over time. The firm provides portfolio companies with operational resources, mentorship, and network access, organized around two verticals: Business Technology and Healthcare Technology.
Is S3 Ventures a public or private company?
S3 Ventures is a private company. It is classified as venture growth investor backed and is currently operating.
When was S3 Ventures founded?
S3 Ventures was founded in 2005. It employs 11 to 50 people.
Where is S3 Ventures based?
S3 Ventures is headquartered in Austin, United States, in the North America region.
Who are S3 Ventures's main competitors?
Direct peers on record are Foundry Group, LiveOak Venture Partners, Next Coast Ventures, Mercury Fund, Elsewhere Partners and Santé Ventures. Broad incumbents are Norwest Venture Partners and Gilde Healthcare. Regional players are ATX Seed Ventures and Capital Factory.
Does S3 Ventures have an API?
No public API is recorded for S3 Ventures.
What industry is S3 Ventures in?
S3 Ventures's product category is Venture Capital. Its primary akta.pro industry code is FSANAAAB, Early-Stage Venture Capital (Series A/B), with a secondary code of FSANAAAD, Sector-Focused Venture Capital (Vertical Specialists).