Emil Eifrem
About Emil Eifrem
Emil Eifrem is the co-founder and CEO of Neo4j, a graph database and analytics company. He sketched the property graph model on a flight to Mumbai in 2000. He is a co-author of the O'Reilly book Graph Databases. Crunchbase lists him as Neo4j's founder and CEO since January 2007 and as a Neo4j board member. It places him in Menlo Park, California.
Before Neo4j he was CTO at Windh Technologies, a Swedish company. He studied at Linköping University. Crunchbase also lists him as an advisor to Shapelets since 2019.
Neo4j describes itself as the graph database behind enterprise AI and agentic systems. A HumanX speaker bio says 84 of the Fortune 100 use it. He has spoken about graph-based context for AI at events including HumanX 2026 and AI Engineer.
Public data trackers show a small, mostly European angel portfolio. Tracxn lists three investments: Validio (seed, June 2022), deepset (Series A, April 2022) and Better Stack (Series A, July 2022). In each he was one of several investors, alongside funds such as Lakestar, Google Ventures and Creandum.
He has kept investing in 2026. Validio's March 2026 Series A announcement names him among its returning angels. He is also named in the Qontext and Oplane rounds below.
Qontext, a Berlin startup building an independent context layer for AI, announced a pre-seed round in February 2026, reported as $2.7M. HV Capital led it, with Zero Prime Ventures participating. Eifrem was named among the angels, alongside founders from n8n, Celonis, Cognigy and make.com.
Oplane, a Malmö AI security startup, raised a seed round of $5.2M (EUR 4.5M) in 2026. Seed Capital led it, with existing investor Icebreaker.vc participating. Eifrem is named among the angels. Oplane automates security architecture and threat modeling for teams that build software with AI coding tools.
Validio, a Stockholm enterprise data quality platform, raised a $30M Series A in March 2026. Plural led it, and Eifrem participated as a previous angel investor.
The public record shows investments in data, AI infrastructure, AI security and enterprise software. Tracxn lists Sweden and Germany as his top investment locations. His known deals run from pre-seed (Qontext) and seed (Oplane) to Series A (deepset, Better Stack, Validio). He tends to join rounds led by institutional funds rather than lead them. Check size and any stated investment criteria are not public.
- Oplane: Malmö AI security startup that automates threat modeling for AI coding teams. Joined its 2026 seed round.
- Qontext: Berlin startup building a context layer for AI agents and workflows. Joined its February 2026 pre-seed.
- Validio: Stockholm enterprise data quality platform. Tracxn lists a June 2022 seed, and he joined the March 2026 Series A.
- deepset: AI company that Tracxn lists as a 2022 Series A investment.
- Better Stack: Monitoring software company that Tracxn lists as a July 2022 Series A investment.
- crunchbase.com/person/emil-eifrem
- tracxn.com/d/people/emil-eifrem/__bYZbUumZvLyjExYqKoFcRlgp5cDZA5HLLzBj
- arcticstartup.com/oplane-raises-e4-5m-seed
- pulse2.com/qontext-2-7-million-pre-seed-funding
- validio.io/blog/validio-raises-30m-series-a
- ai.engineer/speakers/emil-eifrem
- humanx.co/speaker/emil-eifrem
- inovia.vc/founders/company-founders/emil-eifrem
Investing activity
Emil Eifrem appears in 2 AI deals tracked by the Lounge deals desk. The rounds are mostly Seed and Pre-seed, with a median round size of $5M. The most recent are Oplane (Seed, $5.2M (EUR 4.5M), Jun 2026) and Qontext (Pre-seed, €2.7M, Feb 2026).
Emil Eifrem most often invests alongside Seed Capital, Joakim Nydren, Icebreaker.vc and Robert Lagerstrom, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Emil Eifrem
Who is Emil Eifrem?
Emil Eifrem is the co-founder and CEO of Neo4j, the graph database company. He also invests as an angel in AI and data startups.
Does Emil Eifrem invest in AI startups?
Yes. He was named as an angel in Qontext's February 2026 pre-seed and in Oplane's 2026 seed round. He also joined Validio's March 2026 Series A.
What check size does Emil Eifrem write?
His check size is not public. Round announcements list him as an angel participant without amounts.
What stage does Emil Eifrem back?
His public deals span pre-seed, seed and Series A. In the rounds above, institutional funds led and he joined as an angel.
Which sectors and regions does Emil Eifrem focus on?
His known investments are in AI infrastructure, data quality, AI security and developer or monitoring software. Tracxn lists Sweden and Germany as top locations.
How can founders reach Emil Eifrem?
His LinkedIn profile is linkedin.com/in/emileifrem. He has no public pitch process that we could find, so a warm introduction through a shared investor or founder is the most likely route.
Is Emil Eifrem an angel investor?
Yes. Emil Eifrem invests personally as an angel.
What AI companies has Emil Eifrem invested in?
Emil Eifrem's AI investments include Oplane and Qontext. The 2 rounds on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Emil Eifrem invest at?
In the rounds tracked on Lounge, Emil Eifrem has invested at Seed and Pre-seed, with a median round of $5M.
Who does Emil Eifrem co-invest with?
Emil Eifrem's most frequent co-investors on Lounge are Seed Capital (1 deal), Joakim Nydren (1 deal), Icebreaker.vc (1 deal), Robert Lagerstrom (1 deal) and HV Capital (1 deal).