Sep 2026 Theme Wrap — The Monthly Theme Map
20 trading days · 100 recurring themes · top 15 themes — most persistent is Semiconductor Equipment at 12 days (monthly avg. +10.4%). Best single day this month: Sep 15, +17.3%.
Average change over the period
Chip themes led September. Semiconductor Equipment had 12 strong days and an average change of 10.4%, with its best day of 13.55% on Sep 21.
Semiconductor Materials & Components also had 12 strong days, averaging 8.19%. HBM (High Bandwidth Memory) followed with 11 days and an average change of 6.14%.
Outside chips, Robotics (Industrial & Collaborative) posted the month’s largest single-day move, 17.26% on Sep 15. System Semiconductors averaged 12.44% across 5 strong days.
100 themes recurred this month.
Monthly Theme Ranking
| Theme | Days strong | Monthly avg. | Best day | Leader |
|---|---|---|---|---|
| Semiconductor Equipment | 12d | +10.4% | 2026-09-21 (+13.6%) | Gigalane, Dawon Nexview, The Codi |
| Semiconductor Materials & Components | 12d | +8.2% | 2026-09-21 (+12.9%) | Micro2nano, Megatouch, Mi |
| HBM (High Bandwidth Memory) | 11d | +6.1% | 2026-09-21 (+9.4%) | Nextin, Rayence, Laserssel |
| Semiconductor Majors (Fabrication) | 10d | +4.0% | 2026-09-07 (+8.7%) | DB HiTek, SK hynix, Samsung Electronics |
| Semiconductor Substrates (FC-BGA, MLB) | 9d | +5.1% | 2026-09-22 (+12.4%) | LG Innotek, GigaVis, Dawon Nexview |
| AI & Robotics | 7d | +7.8% | 2026-09-04 (+11.1%) | Nota, Robotis, Madup |
| Construction Majors | 7d | +3.0% | 2026-09-07 (+5.8%) | GS Engineering & Construction, Daewoo Engineering & Construction, Hyundai Engineering & Construction |
| Optical Communications | 6d | +8.5% | 2026-09-09 (+12.7%) | Mercury, VISSEM Electronics, Sungho Electronics |
| System Semiconductors | 5d | +12.4% | 2026-09-29 (+16.6%) | Global Technologies, Signetics, Alphachips |
| Robotics (Industrial & Collaborative) | 5d | +11.4% | 2026-09-15 (+17.3%) | TPC Robotics, Keyang Electric Machinery, Namuga |
| 5G | 5d | +11.0% | 2026-09-16 (+15.9%) | Sensorview, Ace Technologies, Wooriro |
| Nuclear | 5d | +9.6% | 2026-09-08 (+13.5%) | Taihan Cable & Solution, Sammi Metal Products, Enertork |
| Telecom Equipment | 5d | +9.6% | 2026-09-09 (+15.3%) | Mercury, VISSEM Electronics, Sensorview |
| Battery | 5d | +8.9% | 2026-09-09 (+12.0%) | TCC Steel, Global SM Tech, Samkee Energy Solutions |
| Steel (Small & Mid Cap) | 5d | +8.2% | 2026-09-30 (+16.2%) | Keum Kang Steel, Dongkuk Industries Company, Dongil Steelux |
What to Watch Next Month
Four chip themes ended September on a continuing (running) streak. Steel (Small & Mid Cap) had its best day of 16.21% on Sep 30, the final session.
5G also carried a running tag, averaging 10.98%. System Semiconductors had its best day on Sep 29, so the next data will show whether these late-month moves continue.
Theme heatmap
| 09-01 | 09-02 | 09-03 | 09-04 | 09-07 | 09-08 | 09-09 | 09-10 | 09-11 | 09-14 | 09-15 | 09-16 | 09-17 | 09-18 | 09-21 | 09-22 | 09-23 | 09-28 | 09-29 | 09-30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Semiconductor Equipment | +12.8 | +10.0 | +11.2 | +11.0 | +11.6 | +8.5 | +6.7 | +13.6 | +8.8 | +11.7 | +11.2 | +7.9 | ||||||||
| Semiconductor Materials & Components | +8.0 | +7.6 | +6.3 | +7.5 | +9.7 | +9.2 | +6.4 | +12.9 | +5.7 | +10.2 | +7.3 | +7.4 | ||||||||
| HBM (High Bandwidth Memory) | +6.8 | +5.4 | +4.7 | +6.2 | +4.5 | +6.4 | +9.4 | +3.4 | +6.1 | +6.3 | +8.4 | |||||||||
| Semiconductor Majors (Fabrication) | +2.5 | +8.7 | +5.7 | +3.3 | +4.4 | +3.7 | +3.4 | +0.9 | +1.8 | +5.5 | ||||||||||
| Semiconductor Substrates (FC-BGA, MLB) | +4.7 | +3.0 | +5.8 | +2.1 | +3.7 | +12.4 | +3.6 | +4.4 | +6.0 | |||||||||||
| AI & Robotics | +11.0 | +7.0 | +6.1 | +9.4 | +6.6 | +5.2 | +9.2 | |||||||||||||
| Construction Majors | +3.7 | +5.8 | +2.6 | +1.8 | +1.7 | +2.1 | +2.9 | |||||||||||||
| Optical Communications | +12.7 | +10.6 | +10.7 | +4.1 | +9.8 | +3.3 | ||||||||||||||
| System Semiconductors | +9.3 | +12.2 | +10.3 | +13.9 | +16.6 | |||||||||||||||
| Robotics (Industrial & Collaborative) | +16.9 | +8.9 | +6.0 | +17.3 | +8.0 | |||||||||||||||
| 5G | +11.5 | +9.5 | +15.9 | +6.8 | +11.2 | |||||||||||||||
| Nuclear | +11.5 | +13.5 | +10.1 | +5.7 | +7.4 | |||||||||||||||
| Telecom Equipment | +15.3 | +12.4 | +6.7 | +9.9 | +3.8 | |||||||||||||||
| Battery | +5.8 | +12.0 | +9.0 | +6.6 | +11.2 | |||||||||||||||
| Steel (Small & Mid Cap) | +10.2 | +3.5 | +7.5 | +3.5 | +16.2 |