An open-end investment institution is an investment institution whose participation rights are purchased or repaid directly or indirectly at the request of the participants at the expense of the assets. Open-end investment institutions are therefore continuously obliged to continue buying and issuing participations. Ongoing means having a set regularity, such as daily, weekly, or monthly. Open investment institutions usually buys in at least once a year. Investment institutions may determine that under special circumstances they will not purchase units against their conditions. However, the conditions of open investment institutions may not prevent purchases or even make them impossible.