Shenzhen-listed RoboTechnik, which claims to be the largest silicon photonics tool maker and whose stock is up 340% over the past year, files for a HK listing (Zinnia Lee/Forbes)

Zinnia Lee / Forbes : Shenzhen-listed RoboTechnik, which claims to be the largest silicon photonics tool maker and whose stock is up 340% over the past year, files for a HK listing —  RoboTechnik Intelligent Technology's Shenzhen-listed shares soared 340% over the past year, propelling founder Dai Jun's net worth to $2.4 billion.

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