SFA Semiconductor +16.96%, Semiconductor Test Theme +6.12%, Why the Strength?
픽스톡AI Summary
On 2026-09-21 close, the semiconductor post-process and test theme outperformed with an average gain of +6.12%.
The clear leader was SFA Semiconductor (036540), while weaker names such as Trio-Tech International (TRT) at -2.32% indicate varying theme breadth that should be checked.
This report was generated using data that passed KOSPI reference-day and price outlier guards, and the next trading day should confirm trade volume persistence and follower spread.
Today strong theme: Semiconductor post-process, test
Theme average change: +6.12%
Representative leader: SFA Semiconductor (036540) +16.96%
Weak member within theme: Trio-Tech International (TRT) -2.32%
Why was the semiconductor post-process and test theme strong today?
The theme groups companies such as test sockets, probe cards, test handlers, and OSATs linked to post-process and test services.
Check connections to HBM and AI semiconductor capacity expansions.
The theme recorded an average gain of +6.12% today.
To distinguish single-stock news from broad theme diffusion, observe the leader and laggard moves together.
Stock movements
| Stock | Market | Change | Notes |
|---|---|---|---|
| SFA Semiconductor (036540) | KOSDAQ | +16.96% | A post-process specialist performing semiconductor packaging and testing, with core business focused on memory semiconductor assembly and inspection, directly tied to the theme keywords. |
| Hanam Micron (067310) | KOSDAQ | +15.91% | An OSAT provider offering post-wafer-cut packaging and test services, directly related to assembly/inspection processes for memory and non-memory semiconductors... |
| Doosan Testna (131970) | KOSDAQ | +10.34% | Semiconductor test specialist providing wafer and package test services, with inspection processes as core revenue sources in system semiconductors and image sensors. |
| LB Semicon (061970) | KOSDAQ | +7.18% | Engages in OSAT business including bumping, packaging, and testing, clearly connected to assembly and inspection processes that finalize chips as products. |
| ISC (095340) | KOSDAQ | +6.87% | Manufactures semiconductor test sockets, supplying essential parts for chip test equipment, producing products used directly in post-process testing stages. |
| FormFactor (FORM) | NASDAQ | +6.14% | Focuses on probe cards and wafer test solutions for semiconductor testing, supplying key equipment and consumables used in memory and logic test processes, classifying it as a test-related stock... |
Checklist for the next trading day
Confirm whether today’s strength was accompanied by rising trade volume.
Separate names that held gains through the close from those with long upper wicks.
Check whether related US-listed ETFs or peer companies continue the trend.
Find under-rotated names within the theme, while distinguishing simple low-price rotation from structural momentum.
Read more
- Semiconductor post-process, test related stocks/leaders
- Today's market close briefing: PickStock Insight
- Expand the theme yourself: Mindmap
Published: 2026-09-21 16:40 KST. Data sources: PickStock theme DB, Yahoo Finance price cache. This is auto-generated after checking price outliers and index reference day, and provided for information only, not investment advice.
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