Tags top 30 listed companies HNX to honour 30 firms for corporate governance Tuesday, Sep 05, 2017 The Ha Noi Stock Exchange (HNX) will assess and honour the top 30 listed companies for best corporate governance in November during its annual convention for listed businesses. HN Exchange honours transparency Monday, Nov 14, 2016 The Ha Noi Stock Exchange has honoured the top 30 listed companies recognised as being most transparent in the 2015-16 period.