T&S Communications (300394, SZSE) is a China company in the Optical Modules & Devices segment of the AI compute value chain — Chinese optical engine and passive component supplier for high-speed transceivers. As of October 04, 2026, its market cap is $42.4 billion ($42.4B), ranking #71 of 244 companies overall and #5 of 23 in the Optical Modules & Devices segment (7.0% of the segment, 0.17% of the chain). Over the past year the stock gained 107.0% (52-week range 102.01 – 354.27 CNY).
| Company | T&S Communications（天孚通信） |
|---|---|
| Ticker | 300394 · SZSE |
| Segment | Optical Modules & Devices |
| Headquarters | China |
| Market cap | $42.4B（$42.4 billion） |
| Close | 260.77 CNY (October 04, 2026) |
| Today | +1.87% |
| 30 days | -10.37% |
| 1 year | +106.96% |
| 52-wk high / low | 354.27 / 102.01 CNY |
| Share of segment | 7.0% (Optical Modules & Devices: 23 companies) |
| Share of chain | 0.17% (244 companies combined) |
| Segment leader | Zhongji Innolight ($141.8B) |
| Net income (TTM) | $345.9 million |
|---|---|
| P/E ratio (TTM) | 122.5 |
| P/B ratio | 49.88 |
| 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 |
| 10 | Cambridge Technology 603083 | SH | $11.3B |