DEEP RESEARCH · SEC
SEC: An Industrial X-ray Inspection and e-beam Source Localization Player
A report on semiconductor, battery and defense inspection demand, vertical integration, backlog and expansion
0. Bottom line first
SEC's key point is that it is not just an equipment assembler: it internalizes the electron-beam generator, a core component that determines X-ray inspection performance. The KRW 50.8 billion backlog, second-plant expansion and removal of mezzanine risk are the main 2026 operating-leverage watch points.
Since its 2000 founding, SEC has produced industrial X-ray inspection equipment and core components for semiconductors, displays, batteries and defense. e-beam generator technology is held by only a few global companies such as Hamamatsu and Thermo Fisher, making internalization central to SEC's identity.
1. Business structure
Semiconductor X-ray inspection
A high-margin core revenue source rising with HBM demand.
Battery X-ray inspection
Customers include LG Energy Solution, Samsung SDI, SK On, Verkor and ACC.
LINAC systems
Stable demand from LIG Nex1, Hanwha Aerospace and the Agency for Defense Development.
Maintenance and consumables
Revenue grows with the installed equipment base.
The four business pillars are semiconductor AXI, battery AXI, LINAC-based inspection systems and tabletop SEM. Owning the source technology gives cost and delivery advantages versus competitors that buy core parts externally.
2. Economic moat
Official fact: SEC internalizes e-beam generator source technology. Key customers include Korea's three battery majors, European battery companies, LIG Nex1, Hanwha Aerospace and the Agency for Defense Development.
Interpretation: Making the core component internally changes cost, delivery and service response. In a tube shortage, competitors may wait six months to a year, while SEC can reduce supply-chain risk through internal sourcing.
| Moat | Content | Effect |
|---|---|---|
| Technology | Black-boxed e-beam source | Controls equipment performance and cost |
| Relationship | High switching cost in inspection equipment | Replacement is hard once embedded in customer process |
| Policy | Strategic-material localization | Aligned with defense and materials independence policy |
| Delivery | Internalized source | Immediate procurement during tube shortages |
3. Cash flow and expansion
Inventory increased by about KRW 8.9 billion from KRW 33.4 billion at end-2024 to KRW 42.3 billion in 3Q 2025. The source interprets this as raw materials and WIP prepared for the KRW 50.8 billion backlog, not bad inventory.
Investment cash flow includes land preparation and foundation work for a second plant near the Suwon headquarters. The plant is intended to more than double capacity to an annual sales scale of KRW 150.0 billion. About KRW 7.0 billion of IPO proceeds was used to repay high-interest short-term borrowings.
4. Shareholder structure and clean-up
Wonik PE, the second-largest shareholder, is the investment arm of the Wonik group, a mid-sized semiconductor/display equipment group. That suggests potential strategic value from Wonik's customer network.
Official fact: The source states that no outstanding mezzanine securities remain.
Interpretation: Potential dilution risk has been removed. The remaining supply-demand issue is possible overhang from the second-largest shareholder's exit.
5. Growth strategy
The strategy is higher semiconductor mix, battery customer diversification, defense LINAC localization, AI inspection software upgrades and high-output nano-focus tube development. SEC reinvests about 10% of revenue into R&D and recently focused on AI inspection software and a 160kV high-output nano-focus tube.
| Growth axis | Basis | Watch point |
|---|---|---|
| Semiconductor | HBM demand and high-margin products | Operating leverage as mix rises |
| Battery | Korean majors plus Verkor and ACC | Investment delays from battery chasm |
| Defense | K-defense exports and localization policy | Budget and project timing |
| New plant | Backlog conversion and KRW 100.0 billion revenue base | 2026 completion and utilization |
6. Risks
- Overhang: institutional exit by the second-largest shareholder can pressure supply-demand.
- Battery chasm: customer investment delays can delay revenue recognition and increase inventory burden.
- Expansion execution: plant delays can slow backlog conversion.
- Product mix: semiconductor equipment share needs to rise for margin expansion.
7. My conclusion
SEC can be rerated from an equipment assembler into a global inspection-solution company with core parts. Near-term losses can be read as growth inventory and expansion costs, but the real test is how quickly the KRW 50.8 billion backlog turns into revenue and operating cash flow after 4Q 2025.
Sources
- Naver Blog original: https://m.blog.naver.com/PostView.naver?blogId=star_of_self&logNo=224099588557