Semiconductor & AI supply-chain companies in Ireland
As of 2026-10-09, wafergraph tracks 5 semiconductor and AI supply-chain companies headquartered in Ireland, across 3 value-chain segments, most of them in AI & Data Center (3). The largest by market cap is Seagate Technology Holdings at $176.2B; the 5 priced companies total $599.8B. 4 hold a monopoly or leader position in their segment.
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Data as of 2026-10-09 · country = headquarters, not fab location · market caps from the daily wafergraph pipeline (Yahoo × SEC shares); unpriced companies are listed but not summed
1 of 5 companies in Ireland has a nonzero supply-chain criticality score in Wafergraph's data.
Largest Ireland companies by market cap
| Company | Segment | Position | Market cap | Ticker |
|---|---|---|---|---|
| Seagate Technology Holdings | Memory Modules & Storage | leader | $176.2B | NASDAQ:STX |
| Eaton | Power & Cooling | major | $164.9B | NYSE:ETN |
| Trane Technologies plc | Power & Cooling | leader | $103.4B | NYSE:TT |
| Johnson Controls International plc | Power & Cooling | leader | $93.3B | NYSE:JCI |
| TE Connectivity | Passive Components (MLCC, resistors, inductors) | leader | $62.0B | NYSE:TEL |
All 5 companies by segment
AI & Data Center (3)
- Trane Technologies plc — Manufactures chillers and liquid cooling systems for data centers, including a thermal management reference design co-developed with NVIDIA, and acquired liquid-cooling company LiquidStack in 2026.
- Johnson Controls International plc — Manufactures YORK-brand chillers for data-center cooling and has invested in liquid-cooling technology company Accelsius.
- Eaton — Electrical power management and data-center power infrastructure.
Memory (1)
- Seagate Technology Holdings — Hard disk drive maker; one of two dominant HDD suppliers to hyperscale and enterprise data centers.
Analog, Power, RF (1)
- TE Connectivity — Maker of connectors and sensors for harsh environments, serving automotive, industrial, aerospace/defense and communications customers.
Tracked revenue
5 of the 5 companies report revenue in the dataset, totalling $101.8B (latest fiscal year per company, SEC EDGAR or Wikidata).
Frequently asked questions3
- How many semiconductor companies are in Ireland?
- wafergraph tracks 5 semiconductor and AI supply-chain companies headquartered in Ireland, across 3 segments.
- What is the largest semiconductor company in Ireland?
- Seagate Technology Holdings is the largest Ireland company in the dataset by market cap ($176.2B, as of 2026-10-09).
- How many Ireland semiconductor companies have a supply-chain criticality score?
- 1 of 5 companies in Ireland has a nonzero supply-chain criticality score in Wafergraph's data.
Cite as: wafergraph, “Semiconductor companies in Ireland — 5 tracked, ranked by market cap”, https://wafergraph.com/country/ireland/ (data as of 2026-10-09).