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DEEP RESEARCH · LOT VACUUM

LOT Vacuum: Samsung’s Strategic Stake, Dry Pump Localization, and the Turnaround Roadmap

A semiconductor-equipment view focused on HBM, GAA, service integration, and operating leverage after the downcycle

Date: 2025-12-28 · Semiconductor equipment/supply-chain view · Naver Blog source

Investment decisions are your responsibility. This material is research, not a recommendation to buy or sell.

0. Bottom line first

Despite the 2025 loss, I do not read LOT Vacuum as structurally impaired. The key questions are whether its domestic dry-vacuum-pump position, Samsung Electronics’ 7.12% stake, and the August 2025 merger of LOT TS translate into leverage during the 2026 upcycle.

1. Technology roots

Official fact: LOT Vacuum was founded on March 23, 2002, acquired the Pittsburgh dry-pump business of Oerlikon Leybold Vacuum in June 2002, and listed on KOSDAQ on October 5, 2005.

Interpretation: The company’s advantage is not just the slogan of localization. It began with source technology, manufacturing know-how, and proven product lines such as Dura Dry.

Dry Vacuum Pump Value ChainCritical infrastructure for front-end semiconductor processes
EtchHarsh process support
CVD/ALDByproduct removal
Ion implantClean vacuum
OverhaulService data feedback
Product sales plus service can reduce cyclicality.

2. Strategic alliance with Samsung

Official fact: In November 2020, LOT Vacuum raised about KRW 19.0bn from Samsung Electronics through a third-party allotment. As of September 30, 2025, Samsung is shown as holding 1,267,668 shares, or 7.12%.

Interpretation: This stake creates a supply-chain lock-in effect. After Japan’s export controls, localization of critical materials, parts, and equipment became strategic, and vacuum pumps are line-availability infrastructure.

LOT Vacuum ownership and business image
Founder

Oh Heung-sik

An engineer-manager with Leybold Korea experience. The source lists 24.11%, or 4,294,105 shares.

Strategic

Samsung Electronics

A 7.12% shareholder. The source estimates Samsung-related revenue at about 77% as of 2025 3Q.

Treasury

Treasury shares

The 12.33% treasury share ratio may support cancellation or strategic exchanges.

3. Business model and moat

Dry vacuum pumps evacuate gases from semiconductor chambers and remove toxic gases and process byproducts. LOT combines equipment sales with maintenance and overhaul services. Absorbing the wholly owned LOT TS on August 1, 2025 integrated manufacturing and service.

Interpretation: Field failure and wear data feeding back into R&D matters for high-end pumps. HBM TSV etch, sub-3nm GAA, and ALD raise the value of corrosion resistance, thermal control, and byproduct handling.

4. 2025 trough and balance sheet

ItemSource figureRead-through
2025 3Q cumulative revenueKRW 177.36bnDown year on year
Operating profit-KRW 4.88bnTurned to loss
Net income-KRW 5.53bnTurned to loss
R&D expenseAbout KRW 9.2bnMore than 5% of revenue
Cash-like assetsAbout KRW 88.2bnKRW 80.0bn cash plus KRW 8.2bn short-term financial assets
Debt ratioAbout 30%Liabilities KRW 74.6bn, equity KRW 246.0bn
Credit ratingA-, cash-flow grade BeCredible, September 2025
LOT Vacuum earnings and balance-sheet image

5. 2026 upturn points

  • HBM expansion: TSV processes require deep, precise etching and high-performance pumps.
  • GAA: Sub-3nm ALD and etch complexity can lift high-end pump ASP.
  • Non-semiconductor: solar TOPCon/HJT lines and battery drying/degassing are additional demand areas.
  • Merger effect: LOT TS integration can reduce cost and improve service-data-driven R&D.

Official fact: The source expects revenue could recover to the 2022-2023 range of KRW 300bn-400bn if Samsung’s Pyeongtaek P4/P5 and Taylor fab equipment move-in accelerates in 2026.

LOT Vacuum outlook and reference image

6. Risks

  • Samsung exposure above 70% is a double-edged sword.
  • Global competitors such as Edwards and Chinese local players remain threats.
  • Quarterly orders must confirm whether 2025 was a cyclical trough or demand erosion.

Sources

Naver original