Less than 2% of global venture funding reaches female-led businesses. That number has barely moved in years. Triin Linamagi built Sie Ventures in late 2020 to directly address that gap. The firm does more than invest. It builds the pipeline: access to education, investor networks, and capital, all structured around diverse founding teams. For founders and investors tracking where capital for female co-founded startups is actually moving, Sie Ventures is a firm worth knowing.
Triin based in London. Before co-founding Sie Ventures, she was a VP and investor at The Venture Collective, Founders Factory, and Startupbootcamp. She was also in the founding teams of three companies across fintech and HRTech. That blend of operator and investor experience shapes how Sie Ventures is structured and how it selects founders.
The Funding Gap is Still Real:
The numbers are well documented. Female-led businesses deliver 250% greater returns per dollar invested compared to all-male teams. And yet venture capital has not shifted proportionally in their direction. Part of the structural problem, as Triin has explained publicly, is that deal flow in VC runs largely through referral networks. Those networks tend to replicate existing demographics. Sie Ventures works on fixing both the supply and demand side of that equation.
The commercial case Triin makes is concrete. Backing female entrepreneurs could increase global GDP by up to $2 trillion, roughly 2 to 3% of global GDP, and generate up to 400 million jobs globally. Women also control approximately 80% of household spending decisions. Sie Ventures uses these figures as part of its core investment thesis, not as a side argument.
What Sie Ventures Has Built:
Since launching, Sie Ventures has supported 175 companies, and those companies have collectively raised £250 million. The Sie investor community has made 175 checks into early-stage companies. In 2025, Sie Ventures won the Accelerator of the Year Award from UKBAA. The year before, it won Angel Group of the Year, also from UKBAA.
The firm runs two programs for founders. Sie Foundations supports teams at the earliest stages of fundraising preparation. Sie Catalyst is a three-month program for founders actively preparing to raise a round. Both programs include VC mentorship, investor introductions, workshops, and peer learning. Past Catalyst partners have included Citi Ventures, HSBC Innovation Banking, British Business Bank, Cooper Parry, and Marriott Harrison.
The Portfolio and Investors:
Sie Ventures has backed companies across healthtech, fintech, sustainability, and deep tech. Portfolio companies include By Rotation, Jude, Shellworks, SpaceDOTS, Okko Health, Fifth Dimension AI, Cino, Emm, Biographica, Fit Collective, and Fides Technology, which was later acquired by LegalOn Technologies. Sie also invested in Grünfin, the Estonian sustainable investing platform, and Rosaly, an employee financial wellbeing platform. Portfolio companies are backed by investors including Balderton Capital, Sequoia, General Catalyst, Localglobe, Seedcamp, and Octopus Ventures.
The British Business Bank has committed £7 million to co-invest alongside five UK angel syndicates, with Sie Ventures selected as one of only two female-led groups in that initiative.
Recognition and Ecosystem Role:
Triin was named one of the UK’s top 50 most inspirational women in technology by AccelerateHer, with the recognition announced in the Financial Times. She serves as the Female Founders and UK VC Channel Lead for Global Women in VC, the world’s largest community for women in venture capital.
Sie Ventures has also run programs in partnership with the Mayor of London and the UK Shared Prosperity Fund, delivered through Funding London. That public-sector backing reflects the firm’s standing within the broader UK startup ecosystem.
What Founders and Investors Can Do:
If you are a female or minority founder at pre-seed or seed stage in Europe, both the Sie Foundations and Sie Catalyst programs offer structured fundraising support and direct VC access. Applications open each year, and the programs are built around active investor participation rather than passive mentorship.
For investors, Sie Ventures offers co-investment access through its SPV and syndicate model. The Sie Syndicate connects angel investors and family offices to rounds in the firm’s portfolio. The Araya Sie Fund provides another route for institutional investors looking to back diverse founding teams through a single vehicle.
Triin and the team at Sie Ventures have made increasing capital for female co-founded startups into a clear investment strategy backed by data and supported by a growing ecosystem. The infrastructure is live, the track record is building, and the programs are open.
