OBS_VALUE: There are no turnover or market share thresholds, but the Commerce Commission sets out a voluntary pre-notification regime for clearance (when there is no substantive lessening of competition) and authorisation (when the proposed acquisition is found to be of benefit to the public). The Commerce Commission has outlined concentration indicators,  the non-observance of which does not necessarily result in the transaction being prohibited, but may lead to closer scrutiny. Since February 2018, it also maintains a public register of investigations into unnotified mergers.