The overall aim of this study was to aggregate the conclusions of all investigations conducted after suicides reported to the supervisory authority in Sweden in 2015, and to identify deficiencies in healthcare found in these investigations; the actions proposed to deal with the deficiencies; the level of the organisational hierarchy (micro-meso-macro) in which the deficiencies and actions were situated; and outcomes of the supervisory authority's decisions.This is a retrospective study of all reports from Swedish primary and secondary healthcare after suicide to the regulatory authority in Sweden in 2015.In 55% (n=240) of cases, healthcare providers reported healthcare deficiencies that contributed to suicide; these deficiencies were primarily in 'suicide risk assessment' and 'treatment'. Actions aimed at preventing new suicides were proposed in 80% of cases (n=347). By far, the most frequent actions were 'education and competence', present in 52% of cases (n=227) and did not much correspond with identified deficiencies. Sixty-five per cent of the deficiencies and actions were at microlevel, while the remainders were at mesolevel. In 65% (n=284) of cases, the supervisory authority approved the investigation without further requirements.The most common identified deficiencies were related to care in the immediate interface between patient and staff. Actions proposed to prevent new suicides were centred on single educational interventions without distinctive sustainable effects in the organisations and usually did not correspond with the identified deficiencies. Future research should examine if application of a framework based on knowledge of the suicide process, suicide prevention strategies and patient safety would enable more sophisticated investigations that could facilitate progress on suicide prevention.