Atlantic Bridge
Atlantic Bridge is a Dublin-based, growth-equity technology fund founded in 2004, with around $1.6 billion under management across eight funds. It backs deep-tech companies in machine learning, digital health, semiconductors and the Internet of Things across Europe and the US. Water is a one-off here: as of 2026 it has backed a single water company, Ireland's Ambisense, across two deals.
Compiled by Antoine Walter, (don't) Waste Water, from official filings and direct intelligence in Leviathan.
The take
Atlantic Bridge is a deep-tech fund, not a water one. Founded in Dublin in 2004 by Brian Long and Elaine Coughlan, technology operators who took chip company Parthus public on Nasdaq, the firm grew into one of Europe's larger growth-equity technology investors, roughly $1.6 billion across eight funds and 23 investors spread from Dublin to London, Munich, Paris and Palo Alto. Its hunting ground is machine learning, digital health, semiconductors, Industry 4.0 and connected sensors.
Atlantic Bridge's one water bet is a tell about how a generalist fund touches the sector. The company, Ambisense, is an environmental-sensor business spun out of Dublin City University that puts internet-connected (IoT) probes on water and emissions and reads them in the cloud. It arrived through the University Bridge Fund, Atlantic Bridge's early-stage vehicle for Irish university research, not through any water mandate, which is why this page leads with Helen McBreen, the partner who founded and runs that spin-out practice.
Atlantic Bridge is a useful marker for a newcomer rather than a water specialist. (don't) Waste Water rates its water commitment One-Off: a single company, last backed in 2021, alongside Irish co-investors like Sure Valley Ventures, Enterprise Ireland and BGF. The signal here is the pattern, not a pipeline. When a water company reads as deep-tech, sensors, AI, hard engineering, a fund like this one will write the cheque, and the way in is the university-research fund rather than the growth-equity flagship.
Water Commitment Score
Compiled from official filings, third-party records, and direct intelligence from investors and founders, in Leviathan · recomputed monthly · as of Jun 2026.
Portfolio · 1 water companies
Invests alongside
Highlighted = profiled on (don't) Waste Water.
Frequently asked
- What does Atlantic Bridge invest in?
- Atlantic Bridge invests in deep-tech and growth-stage technology companies across Europe and the US: machine learning, digital health, semiconductors, computer vision, Industry 4.0 and the Internet of Things. Founded in 2004 and based in Dublin, it manages around $1.6 billion across eight funds and applies a cross-border 'Bridge Model' to help companies scale into new markets.
- Does Atlantic Bridge invest in water?
- Atlantic Bridge invests in water only rarely. As of 2026 it has backed a single water company, the Irish environmental-sensor maker Ambisense, across two deals, with its last water investment in 2021. (don't) Waste Water rates its water commitment One-Off, a by-product of its deep-tech focus rather than a dedicated thesis.
- Who runs Atlantic Bridge?
- Atlantic Bridge was co-founded in 2004 by Managing Partners Brian Long, Elaine Coughlan and Kevin Dillon, all former technology operators. Partner Helen McBreen leads its early-stage deep-tech investing and founded the University Bridge Fund, the vehicle that backed its one water company. The team runs about 23 investors across five offices.
- Where is Atlantic Bridge based?
- Atlantic Bridge is headquartered in Dublin, Ireland, at Fitzwilliam Square, with offices in London, Munich, Paris and Palo Alto. Founded in 2004, it is one of Europe's larger growth-equity technology investors, managing roughly $1.6 billion across eight funds with about 23 investment professionals.
- Is Atlantic Bridge the same as the University Bridge Fund?
- No. The University Bridge Fund is Atlantic Bridge's early-stage fund for spin-outs from Irish universities, backed by Trinity College Dublin, UCD and UCC and led by Partner Helen McBreen. Atlantic Bridge's main funds back later, growth-stage deep-tech companies. The fund's single water company, Ambisense, came through the University Bridge Fund.