aventron Ltd is 46.2% owned by the EBM group (cooperative Elektra Birseck Münchenstein). The Energie Wasser Bern group (ewb), the Bern city utility, owns 15.1% and Stadtwerk Winterthur, the Winterthur utility, a further 10%.  The only other investors with more than a 3% shareholding in aventron are the UBS CEIS II Fund, with 8.1% and Reichmuth Infrastruktur Schweiz with 4.7%.

aventron Ltd shares are listed on the Bern stock-exchange with 20.6% of the equity in free float (shareholders with stakes below 5%).

There exists 34’105’382 shares.