LandMark Optoelectronics (3081.TW, TWSE) is a Taiwan, China company in the Optical Modules & Devices segment of the AI compute value chain. As of October 04, 2026, its market cap is $9.4 billion ($9.4B), ranking #151 of 244 companies overall and #15 of 23 in the Optical Modules & Devices segment (1.5% of the segment, 0.04% of the chain). Over the past year the stock gained 498.2% (52-week range 389.00 – 3,530.00 TWD).
| Company | LandMark Optoelectronics（联亚光电） |
|---|---|
| Ticker | 3081.TW · TWSE |
| Segment | Optical Modules & Devices |
| Headquarters | Taiwan, China |
| Market cap | $9.4B（$9.4 billion） |
| Close | 2,925.00 TWD (October 04, 2026) |
| Today | +9.96% |
| 30 days | +9.14% |
| 1 year | +498.16% |
| 52-wk high / low | 3,530.00 / 389.00 TWD |
| Share of segment | 1.5% (Optical Modules & Devices: 23 companies) |
| Share of chain | 0.04% (244 companies combined) |
| Segment leader | Zhongji Innolight ($141.8B) |
| # | Company | Market | Market cap |
|---|---|---|---|
| 1 | Zhongji Innolight 300308 | SZ | $141.8B |
| 2 | Lumentum Holdings LITE | US | $97.4B |
| 3 | Eoptolink Technology 300502 | SZ | $80.8B |
| 4 | Coherent Corp COHR | US | $66.0B |
| 5 | T&S Communications 300394 | SZ | $42.4B |
| 6 | Yuanjie Semiconductor 688498 | SH | $29.9B |
| 7 | Accelink Technologies 002281 | SZ | $20.3B |
| 8 | Fabrinet FN | US | $16.6B |
| 9 | HGTech 000988 | SZ | $13.8B |
| 15 | LandMark Optoelectronics 3081.TW | TW | $9.4B |
| 10 | Cambridge Technology 603083 | SH | $11.3B |