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The “AI cooling trade” has a clean answer in the US — you buy Vertiv and you’re done. Try to do the same in Korea and you hit a wall: there is no single ticker that owns this. And that absence is the most Korean thing about it. This is not financial advice.
This is Episode 6 — the finale — of our series on the AI data center power supply chain. We’ve walked generation, transformers, cables, storage and the nuclear chain; this is the last mile, where electricity is distributed to the rack and the heat is pulled back out. See the full map in our intro: Korea’s AI power supply chain (Ep.0).
The short answer: there is no Korean Vertiv
The fastest-rising cost line in an AI data center is cooling. As Nvidia-class racks pack more power into less space, air cooling runs out of room and operators move to liquid and immersion cooling. In the US, the theme has a face: Vertiv (NYSE: VRT), a pure-play that sells cooling and power together — its stock rose roughly 90% in 2026 and its backlog passed $15 billion.[verify] Korea has no equivalent single stock. Instead, “cooling and distribution exposure” is scattered across three very different buckets: a big-cap division (LG’s chillers), refiners’ cooling fluid (SK Enmove, GS Caltex), and small-cap immersion names (K-Ens, GST). So the first decision isn’t which stock — it’s which kind of exposure.
Why now — the last mile became the bottleneck
This series runs on one line: AI eats electricity. But the last stretch — getting clean power to the chip and pulling heat off it — is where the spending now concentrates. Liquid cooling moves from option to default as rack density climbs, and the cooling-fluid and distribution layers grow with it. Vertiv is the name US investors reach for: Q1 2026 revenue of about $2.65 billion (up ~30% year on year) and a backlog above $15 billion.[verify]
🎩 Under the Gat — Here’s what readers outside Korea keep missing. America has Vertiv; Korea has no one sitting in that seat. That sounds like a flaw — but it’s actually the key to how Korean industry is built. You don’t buy a Korean cooling stock. You buy a structure.
The part outsiders miss — why Korea has no cooling pure-play
The answer is one phrase: chaebol vertical integration. In Korea, data center cooling doesn’t live in a standalone company — it lives inside a conglomerate.
- Cooling hardware sits inside LG Electronics, which has run an HVAC and chiller business for decades; data center chillers are a new line bolted onto that base.
- Cooling fluid is made by refiners: SK Innovation, through its SK Enmove arm, developed a dielectric coolant and invested in US-based GRC; GS Caltex launched Kixx Immersion Fluid S.[verify]
So where the US buys “cooling” as one stock, Korea splits it into a conglomerate’s division, a refiner’s product line, and a handful of small caps.
The three buckets — both sides, fairly
Korean cooling exposure isn’t one company. It’s three seats, each with a real bull and a real bear.
1) Big-cap division — LG Electronics (KRX: 066570).
Bull: data center chiller orders are running at roughly three times the prior year. Management has pulled forward a ₩1 trillion (~$725M) chiller-revenue target (originally 2027), and its coolant distribution unit (CDU) for liquid cooling is in the late stages of Big Tech certification. The company sizes the chiller addressable market at about $1.6B in 2026 rising to ~$12.7B by 2030.[verify] Bear: LG Electronics is still an appliance-and-TV company at its core. Even a great cooling year is diluted across the whole P&L, so the “cooling win” barely registers in the share price. This is not a pure bet.
2) Refiners’ cooling fluid — SK Innovation (KRX: 096770) / GS Holdings (KRX: 078930).
Bull: if immersion cooling becomes standard, the fluid is a consumable — recurring revenue that rides on existing base-oil expertise. Bear: here too the coolant is a footnote to a giant refining business; the stock still moves on refining margins and oil, not on data centers.
3) Pure small caps — K-Ens, GST and peers.
Bull: the purest immersion-cooling exposure. K-Ens has a single-phase immersion partnership with Spain’s Submer; GST is often grouped with the semiconductor- and data-center-cooling small caps.[verify] Bear: small and volatile. These swing with theme sentiment, carry single-contract and single-customer concentration risk, and trade with thinner liquidity than the large caps.
Plus distribution (the last-mile power) — LS Electric (KRX: 010120), Jeryong Electric (KRX: 033100).
The switchgear and distribution boards that split power down to the rack are led by LS Electric: a record 2025 (revenue ₩4.97 trillion (~$3.6B), operating profit ₩426.4 billion (~$309M)) with 2026 operating profit seen near ₩654.1 billion (~$474M) — though the stock re-rated to a high multiple after its split, which is now the debate.[verify] Jeryong Electric is a small-cap distribution-gear name. (Transformer Big 3 — Hyosung, HD Hyundai Electric, LS Electric — are in Ep.1.)
🎩 Under the Gat — Two seats, then. The option value inside a big cap (LG: if cooling flops the core business still carries you; if it works, it’s a bonus) or the high-volatility pure bet in a small cap (K-Ens, GST: right or wrong, you feel it hard). The number that actually matters isn’t the theme label — it’s what percentage of total revenue that cooling line really is.
The comparison — one ticker vs. a structure
For readers meeting this for the first time: in the US you can buy the data center cooling theme in a single name — Vertiv. In Korea, no single listed company represents cooling and distribution as a whole.
| Korea (scattered) | Vertiv (US anchor) | |
|---|---|---|
| Form | No pure-play — split across divisions and small caps | Data center cooling + power pure-play |
| Main exposure | LG (chillers), SK Enmove / GS Caltex (fluid), K-Ens / GST (immersion) | One ticker, the whole theme |
| Strength | Deep appliance and refining manufacturing, fast lead times (6–9 months) | Integrated solution, global references, backlog $15B+[verify] |
| Weakness | Signal diluted (big caps), volatility (small caps) | Valuation after rising ~90% in 2026[verify] |
| Decisive difference | You have to buy a structure | You can buy a stock |
Not a perfect parallel — for Vertiv, one stock is the theme; in Korea no single name represents cooling and distribution as a whole. That asymmetry is the whole point.
🎩 Under the Gat — Don’t be the late one chasing a “cooling stock” label in Korea. There’s no clean vehicle to ride this theme — only a big-cap option or a small-cap gamble, and they’re opposite risks. To track this properly, watch the revenue mix, not the theme.
So how do you frame it — seats by risk appetite
Not a recommendation — a distinction. The same cooling-and-distribution theme wears different faces.
- Stable core (option): LG Electronics — cooling as upside on top of a real business; the trade-off is a diluted signal.
- Consumable angle: SK Innovation / GS Holdings — recurring fluid revenue, but driven by refining first.
- Pure but volatile: K-Ens / GST — the cleanest immersion exposure, with the sharpest swings and concentration risk.
- Last-mile distribution: LS Electric (with Jeryong as a small cap) — already re-rated, so valuation is the live debate.
Which seat fits is a question of risk tolerance, not of the ticker — and the headline number to keep in view is always the same: how big the cooling line actually is inside each company.
Disclaimer: This article is for information only and is not financial advice. Figures marked for verification, market caps and small- and mid-cap prices and tickers should be re-checked at publish time against the KRX and DART. FX conversions use roughly ₩1,380 per US dollar as of June 2026.
Frequently Asked Questions
Which Korean stock is the “Vertiv of Korea” for data center cooling?
There isn’t a clean single one. The largest exposure is LG Electronics (KRX: 066570) through its chiller and liquid-cooling business, while the purest exposure sits in small-cap names like K-Ens and GST. None is a true pure-play. This is not financial advice.
Who makes immersion cooling in Korea?
Two layers. The cooling fluid comes from refiners — SK Innovation via SK Enmove (which invested in US-based GRC) and GS Caltex (its Kixx Immersion Fluid S). The systems come from small caps such as K-Ens (partnered with Spain’s Submer) and GST. Figures and tickers should be re-checked at publish time. Not financial advice.
What about power distribution inside the data center?
LS Electric (KRX: 010120) is the headline name in switchgear and distribution boards, with Jeryong Electric (KRX: 033100) as a small-cap. The transformer names — Hyosung Heavy, HD Hyundai Electric, LS Electric — were covered in Ep.1.
Big-cap or small-cap — which should I look at?
It is a question of risk appetite, not the ticker. A large cap like LG gives you a stable core business with cooling as an option on top; a small cap gives you pure exposure with much higher volatility and single-customer risk. This is not a recommendation to buy any security.
Can foreigners buy these stocks?
The large and mid caps (LG Electronics, SK Innovation, GS Holdings, LS Electric) are reachable through brokers with Korean market access. The small-cap immersion names trade on KOSDAQ with thinner liquidity. Account and tax steps are covered in a separate guide.
This article is for informational purposes only and is not financial advice. TheGatBull may earn a commission from some links at no cost to you — see our disclosure and full disclaimer.