corporate activity

I notice the ASIC register has some developments for each of Synergy's 100% owned sub companies just in the pass week.

Synergy Exploration NL
Australian Gold Mines NL
Mt Wills Gold Mines NL
Glen Wills Goldfields NL

205 Notification of Resolution
205B Converting to a Proprietary Company
205F Converting to Limited By Shares
205J Altering The Constitution
484O Change to Company Details Changes to Share Structure
206 Application For Change of Company Status
206B Conversion of Company From Public to Pty
206F Change Type (No Liability Coy to Coy Limited By Shares)


Just a guess they are going to Proprietary Limited. Is there costs savings in this or is there any other reasons for doing so?