Advanced Fiber Resources (300620, SZSE) is a China company in the Optical Modules & Devices segment of the AI compute value chain. As of October 04, 2026, its market cap is $10.0 billion ($10.0B), ranking #145 of 244 companies overall and #12 of 23 in the Optical Modules & Devices segment (1.6% of the segment, 0.04% of the chain). Over the past year the stock gained 169.8% (52-week range 96.00 – 406.00 CNY).
| Company | Advanced Fiber Resources（光库科技） |
|---|---|
| Ticker | 300620 · SZSE |
| Segment | Optical Modules & Devices |
| Headquarters | China |
| Market cap | $10.0B（$10.0 billion） |
| Close | 270.48 CNY (October 04, 2026) |
| Today | +3.62% |
| 30 days | -16.49% |
| 1 year | +169.83% |
| 52-wk high / low | 406.00 / 96.00 CNY |
| Share of segment | 1.6% (Optical Modules & Devices: 23 companies) |
| Share of chain | 0.04% (244 companies combined) |
| Segment leader | Zhongji Innolight ($141.8B) |
| Net income (TTM) | $40.7 million |
|---|---|
| P/E ratio (TTM) | 246.7 |
| P/B ratio | 29.86 |
| Basis | PE/PB 腾讯行情；净利润=总市值÷PE 推算（TTM） (source: tencent, 2026-10-05 08:05) |
| # | 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 |
| 12 | Advanced Fiber Resources 300620 | SZ | $10.0B |
| 10 | Cambridge Technology 603083 | SH | $11.3B |