Oct 28: 8 Strong Themes — Cybersecurity, Semiconductor Equipment
8 strong themes — 4 running · 4 recurred. Top: Cybersecurity +17.4%.
Strong themes8
Top change+17.4%
LeaderGenians
Average change by strong theme
Average change of member stocks, by theme · descending
Theme leaders · recent trend
The line is the trend; the end-point colour is the last trading day's direction. Stocks without enough price history show as -
| Theme | Leader | Change | Trend |
|---|---|---|---|
| Cybersecurity | Genians | +30.00% | |
| Semiconductor Equipment | Melcon | +21.35% | |
| Semiconductor Materials & Components | Haesung DS | +19.82% | |
| Robotics (Industrial & Collaborative) | Wonik Holdings | +17.89% | |
| Optical Communications | Lightron Fiber-optic Devices | +29.88% | |
| HBM (High Bandwidth Memory) | Di | +14.55% | |
| AI & Robotics | P&S Robotics | +29.95% | |
| S7 (Samsung Electronics, SK hynix etc.) | SK Square | +11.23% |
On 2026-10-28, all eight strong themes closed with every listed stock higher. Cybersecurity led with an average change of 17.41%, and all 10 of its stocks rose.
Chip names carried the session. Semiconductor Equipment extended its streak to 2 days with an average change of 14.45%, led by Melcon at 21.35%.
After a 2-day gap, Optical Communications returned with an average change of 10.97%. Its leader, Lightron Fiber-optic Devices, gained 29.88% on volume of 38536659 shares.
Today’s Strong Themes at a Glance
| # | Theme | Status | Avg. change | Up/Total | Leader |
|---|---|---|---|---|---|
| 1 | Cybersecurity | recurred after 2 days | +17.4% | 10/10 | Genians |
| 2 | Semiconductor Equipment | 2 days running | +14.4% | 10/10 | Melcon |
| 3 | Semiconductor Materials & Components | 2 days running | +13.6% | 10/10 | Haesung DS |
| 4 | Robotics (Industrial & Collaborative) | 3 days running | +11.3% | 10/10 | Wonik Holdings |
| 5 | Optical Communications | recurred after 2 days | +11.0% | 10/10 | Lightron Fiber-optic Devices |
| 6 | HBM (High Bandwidth Memory) | 2 days running | +10.6% | 10/10 | Di |
| 7 | AI & Robotics | recurred after 2 days | +10.1% | 10/10 | P&S Robotics |
| 8 | S7 (Samsung Electronics, SK hynix etc.) | recurred after 7 days | +9.7% | 7/7 | SK Square |
Theme by Theme
1. Cybersecurity (recurred after 2 days)
- Episode: started 2026-10-28, day 1
| Stock | Change | Close | Leader |
|---|---|---|---|
Genians 263860 | +30.0% | 27,300 | ★ |
SPSoft 443670 | +29.9% | 4,840 | |
Gabia 079940 | +25.9% | 50,500 | |
Ahnlab 053800 | +19.6% | 110,900 | |
Ictk 456010 | +16.8% | 20,200 | |
Axgate 356680 | +12.7% | 17,110 | |
Monitorapp 434480 | +10.4% | 3,445 | |
Initech 053350 | +10.3% | 5,580 | |
Piolink 170790 | +9.3% | 8,960 | |
Dream Security 203650 | +9.2% | 2,445 |
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2. Semiconductor Equipment (2 days running)
- Episode: started 2026-10-27, day 2
| Stock | Change | Close | Leader |
|---|---|---|---|
Melcon 179880 | +21.4% | 19,210 | ★ |
Wonik Holdings 030530 | +17.9% | 28,000 | |
The Codi 224060 | +16.2% | 3,225 | |
Exicon 092870 | +15.5% | 67,000 | |
Di 003160 | +14.6% | 43,300 | |
PSK Holdings 031980 | +14.1% | 193,000 | |
Systems Technology 039440 | +12.6% | 28,550 | |
Tfe 425420 | +11.2% | 84,700 | |
Cymechs 160980 | +10.7% | 22,000 | |
Intekplus 064290 | +10.4% | 63,700 |
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3. Semiconductor Materials & Components (2 days running)
- Episode: started 2026-10-27, day 2
| Stock | Change | Close | Leader |
|---|---|---|---|
LTC 170920 | +21.6% | 40,850 | |
Haesung DS 195870 | +19.8% | 53,500 | ★ |
Mi 059090 | +16.6% | 25,600 | |
Micro Contact Solution 098120 | +14.4% | 54,000 | |
Semcns 252990 | +11.7% | 17,820 | |
Samt 031330 | +11.5% | 7,640 | |
Hansol Technics 004710 | +11.1% | 9,220 | |
OKins Electronics 080580 | +10.4% | 29,700 | |
ISC 095340 | +9.7% | 165,900 | |
Hanyang Digitech 078350 | +9.5% | 41,000 |
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4. Robotics (Industrial & Collaborative) (3 days running)
- Episode: started 2026-10-26, day 3
| Stock | Change | Close | Leader |
|---|---|---|---|
Wonik Holdings 030530 | +17.9% | 28,000 | ★ |
Hallacast 125490 | +16.6% | 11,440 | |
Rainbow Robotics 277810 | +15.1% | 404,500 | |
Cymechs 160980 | +10.7% | 22,000 | |
SPG 058610 | +10.0% | 88,900 | |
Robotis 108490 | +9.8% | 275,500 | |
Pim Korea 448900 | +9.2% | 51,400 | |
ITM Semiconductor 084850 | +8.6% | 6,290 | |
Robostar 090360 | +8.3% | 63,900 | |
Namuga 190510 | +7.1% | 18,310 |
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- [장중수급포착] 원익홀딩스, 기관 8일 연속 순매수행진… 주가 +23.37% — 뉴스핌 (Korean)
- [장중수급포착] 원익홀딩스, 기관 7일 연속 순매수행진… 주가 +4.67% — 뉴스핌 (Korean)
5. Optical Communications (recurred after 2 days)
- Episode: started 2026-10-28, day 2
| Stock | Change | Close | Leader |
|---|---|---|---|
Lightron Fiber-optic Devices 069540 | +29.9% | 4,195 | ★ |
VISSEM Electronics 072950 | +19.1% | 15,650 | |
Korea Advanced Materials 062970 | +10.3% | 2,295 | |
RFHIC 218410 | +9.8% | 51,500 | |
Mercury 100590 | +9.4% | 4,465 | |
TAIHAN Fiberoptics 010170 | +9.3% | 14,980 | |
Woori-Net 115440 | +6.3% | 8,950 | |
Sungho Electronics 043260 | +5.5% | 28,700 | |
LiComm 388790 | +5.4% | 4,500 | |
Zaram Technology 389020 | +4.6% | 11,450 |
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6. HBM (High Bandwidth Memory) (2 days running)
- Episode: started 2026-10-27, day 2
| Stock | Change | Close | Leader |
|---|---|---|---|
Di 003160 | +14.6% | 43,300 | ★ |
PSK Holdings 031980 | +14.1% | 193,000 | |
Systems Technology 039440 | +12.6% | 28,550 | |
SK hynix 000660 | +10.9% | 1,487,000 | |
YC 232140 | +9.9% | 14,040 | |
ISC 095340 | +9.7% | 165,900 | |
Pemtron 168360 | +9.1% | 10,600 | |
Samsung Electronics 005930 | +9.0% | 242,000 | |
Genesem 217190 | +8.2% | 8,810 | |
Dit 110990 | +7.8% | 15,200 |
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7. AI & Robotics (recurred after 2 days)
- Episode: started 2026-10-28, day 1
| Stock | Change | Close | Leader |
|---|---|---|---|
P&S Robotics 460940 | +29.9% | 5,120 | ★ |
Hallacast 125490 | +16.6% | 11,440 | |
Robotis 108490 | +9.8% | 275,500 | |
Robostar 090360 | +8.3% | 63,900 | |
Hyulim ROBOT 090710 | +6.6% | 5,340 | |
Clobot 466100 | +6.2% | 20,050 | |
CMES Robotics 475400 | +6.2% | 15,150 | |
Angel Robotics 455900 | +6.1% | 18,680 | |
Yujin Robot 056080 | +6.0% | 10,180 | |
S2W 488280 | +5.7% | 11,510 |
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8. S7 (Samsung Electronics, SK hynix etc.) (recurred after 7 days)
- Episode: started 2026-10-28, day 1
| Stock | Change | Close | Leader |
|---|---|---|---|
SK Square 402340 | +11.2% | 921,000 | ★ |
Samsung Electronics (Pref.) 005935 | +11.1% | 190,100 | |
SK hynix 000660 | +10.9% | 1,487,000 | |
Samsung Electronics 005930 | +9.0% | 242,000 | |
Samsung Life Insurance 032830 | +8.8% | 277,500 | |
Samsung Electro-mechanics 009150 | +8.7% | 1,306,000 | |
Samsung C&T 028260 | +7.8% | 324,500 |
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Closing Thoughts
Robotics (Industrial & Collaborative) has the longest run in the data, a 3-day streak, with Wonik Holdings leading at 17.89%. The next marker is whether that streak extends.
Semiconductor Materials & Components and HBM (High Bandwidth Memory) are both on 2-day streaks. S7 (Samsung Electronics, SK hynix etc.) came back after a 7-day gap.