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 $2.4B.