A changing investment landscape
In recent years, the conversation around early-stage investing has shifted. Higher interest rates, greater scrutiny on valuations, and a more cautious funding environment have led investors to reassess where risk should sit within a portfolio. Against this backdrop, the UK’s Seed Enterprise Investment Scheme (SEIS) has flourished, becoming one of the more distinctive tools available to private investors.
What is the role of SEIS?
SEIS was introduced in 2012 with a clear objective: to encourage capital into the earliest stages of company formation, where risk is highest, but where innovation begins. Investors can benefit from some of the most generous tax reliefs available, including 50% income tax relief, capital gains reinvestment relief, and loss relief, with losses able to be offset against income tax liabilities. More than a decade on, SEIS is central to the UK’s entrepreneurial ecosystem. Yet discussion tends to focus narrowly on tax relief, rather than its broader investment characteristics.
For a more detailed breakdown of how SEIS tax relief works in practice, see our guide: How SEIS tax relief works.
A growing entrepreneurial base
The context for early-stage investing is evolving. In both the UK and the United States, traditional employment pathways are becoming less predictable, particularly for younger cohorts. At the same time, entrepreneurial intent is rising.
The result is an expanding pool of capable founders entering the market at an earlier stage. Many of these businesses are being built with relatively modest capital requirements, enabled by technology and lower barriers to entry.
Why diversification matters in SEIS investing
SEIS is not simply a tax-efficient structure, but a mechanism designed to channel capital into the most capital-constrained part of the market.
Early-stage investing is inherently asymmetric. A small number of successful companies tend to generate the majority of returns, while others may fail entirely. Diversification is therefore essential.
Guinness Ventures’ experience across EIS, VCT and SEIS
Guinness Ventures was established in 2010 to invest in EIS-qualifying businesses. We launched a VCT in 2023 and a dedicated SEIS strategy in 2025.
Our SEIS strategy focuses on investing at the earliest stage, supporting founders at the point of initial commercialisation. If you are a founder considering raising SEIS funding, learn more about where we look for here: Seeking SEIS.
For investors looking to access SEIS opportunities, further information is available here: Guinness Founders SEIS.
SEIS within an investor portfolio
SEIS provides exposure to a segment of the market with a distinct risk and return profile, complementing more liquid and lower-risk assets.
As the investment landscape continues to evolve, the relevance of SEIS becomes clearer. A growing entrepreneurial base reinforces its position within the UK’s investment ecosystem.
Guinness Ventures is an active SEIS investor, backing early-stage companies across sectors including technology, consumer, business services and healthcare. Our approach focuses on disciplined portfolio construction, supporting founders at the point of initial commercialisation and building diversified exposure for investors.
Investors can learn more about our SEIS strategy here: Guinness Founders SEIS, while founders seeking SEIS investment can find further information here: Seeking SEIS.
Frequently asked questions
What is SEIS and how does it work?
The Seed Enterprise Investment Scheme (SEIS) is a UK government-backed initiative designed to encourage investment into early-stage companies. It offers generous tax reliefs to investors, including income tax relief, capital gains reinvestment relief and loss relief, reflecting the higher risk associated with investing in very early-stage businesses.
SEIS plays a critical role in the UK startup ecosystem by helping founders access capital at the earliest stage, often before traditional venture capital is available.
How can I invest in SEIS opportunities?
Investors typically access SEIS opportunities through specialist investment managers who build diversified portfolios of early-stage companies. This helps manage risk while maintaining exposure to high-growth potential businesses.
Guinness Ventures offers a dedicated SEIS strategy focused on backing high-quality founders at the point of initial commercialisation. You can learn more here: Guinness Ventures SEIS.
Does Guinness Ventures invest in SEIS companies?
Yes. Guinness Ventures launched its SEIS strategy in 2025 and is actively investing in early-stage companies across sectors including technology, consumer, business services and healthcare.
The strategy focuses on identifying disciplined founders building capital-efficient businesses in today’s funding environment. More detail can be found here: Seeking SEIS.
What are the benefits and risks of SEIS investing?
SEIS investing offers exposure to high-growth early-stage companies, with potential for significant upside if a small number of investments perform strongly. Tax reliefs can enhance returns, but they do not remove investment risk.
Most early-stage companies do not succeed, which is why diversification, a long-term outlook and careful manager selection are essential for investors.
What other investment products does Guinness Ventures offer?
In addition to SEIS, Guinness Ventures provides access to EIS investments and the Guinness VCT, covering a broader range of the venture capital lifecycle.
Where can I learn more about SEIS and early-stage investing?
You can explore further insights, guides and commentary on SEIS, venture capital and early-stage investing here: Guinness Ventures resources.
How can founders raise SEIS funding?
Founders raising SEIS funding typically do so at the earliest stage of building their business, often around initial product development or early commercial traction. Capital is usually raised from angel investors or specialist SEIS funds.
To be eligible, companies must meet HMRC SEIS criteria, including limits on company size, age and amount raised. Founders should also prepare a clear investment proposition, including a strong team, credible route to market and capital-efficient growth plan.
Guinness Ventures actively backs early-stage companies through its SEIS strategy. Founders looking to raise capital can learn more here: Seeking SEIS.
What is the difference between SEIS, EIS and VCT?
SEIS, EIS and VCT are all UK government-backed investment schemes designed to encourage investment into growing businesses, but they operate at different stages of the company lifecycle.
SEIS focuses on the earliest stage companies, typically at or near formation. EIS applies to slightly more mature businesses that have begun scaling, while VCTs invest in portfolios of established growth companies through a listed structure.
Each offers different tax advantages and risk profiles. Investors often use a combination of SEIS, EIS and VCT investments to build a diversified exposure across stages.
How should investors evaluate SEIS investment managers?
When considering SEIS investment managers, investors typically assess factors such as investment strategy, sector focus, sourcing capability, team experience and approach to portfolio construction.
Given the early-stage nature of SEIS, track record can be limited or still developing, so qualitative factors such as discipline in selecting companies, support provided to founders and alignment with investors become particularly important.
Guinness Ventures applies a structured and diversified approach to SEIS investing, building on its broader experience across EIS and VCT strategies.
Is Guinness Ventures related to Guinness Global Investors?
Yes. Guinness Ventures is the venture capital arm of Guinness Global Investors, an established investment manager with a long track record across public markets.
Guinness Ventures focuses specifically on early-stage private companies, investing through SEIS, EIS and VCT strategies, while benefiting from the broader investment heritage and infrastructure of the Guinness Global Investors group.
