The Swedish Financial Supervisory Authority has opened, with the European Securities and Markets Authority, a survey to assess how firms are preparing for the European Union's move to one-day securities settlement on 11 October 2027. For firms under the Swedish Financial Supervisory Authority's supervision that handle securities, responding to the survey is mandatory. The exercise is intended to show how far preparations have progressed for the shift from T+2 to T+1 settlement and to identify areas where firms are not yet ready. The authority describes the transition as a major change affecting companies across almost all parts of the financial sector, with some changes needing to be completed by December 2026. As part of its supervisory work, it needs firm-level information to monitor readiness for the new legislation and to act if specific risks emerge for the Swedish market. To simplify reporting, the authority has added its own information requests to ESMA's questionnaire, so one submission covers both surveys. In parallel, the EU T+1 Industry Committee is running its own anonymous survey, with results to be presented only at an aggregate level. Both surveys are open at the same time and close on 9 June 2026.