This is a list of co-options to the Senedd (Welsh Parliament; ; formerly the National Assembly of Wales before 2020). Until 2026, co-options were used for regional members: per the provisions of the Government of Wales Act, 1998, regional members of the Senedd who resign, die or are otherwise disqualified are replaced by the next available and willing person of their original party's list, and no by-election occurs.
The Senedd electoral regions were abolished prior to the 2026 Senedd election, therefore there are no longer any regional members. From 2026, all Senedd constituencies are multi-member and any member who leaves the Senedd is replaced by co-option rather than by-election.
These are the co-options that have occurred since the first elections in 1999.
Assembly / Senedd termRegion Date (that new member took the oath) Incumbent Party Replacement Party Cause1999–2003Mid and West Wales1 May 2000Alun Michael Delyth Evans Resignation to concentrate on his post as Member of ParliamentNorth Wales22 March 2001Christine Humphreys Eleanor Burnham Resignation on health groundsNorth Wales10 Sept 2002 Rod Richards David Jones Resignation on health grounds (Alcoholism)2007–2011South Wales East30 June 2010Mike German Veronica German Resignation on appointment to House of Lords2011–2016South Wales West19 May 2015 Byron Davies Altaf Hussain Resignation on 15 May 2015 due to election as MP for GowerNorth Wales27 May 2015 Antoinette Sandbach Janet Haworth Resignation on 8 May 2015 due to election as MP for Eddisbury2016–2021North Wales28 Dec 2017Nathan Gill Mandy Jones Resignation on 27 December 2017 to concentrate on his post as Member of the European ParliamentMid and West Wales2 August 2018Simon Thomas Helen Mary Jones Resignation on 25 July 2018 due to arrest for possession of indecent imagesSouth Wales East 8 February 2019 Steffan Lewis Delyth Jewell Death from bowel cancer on 11 January 2019South Wales East 6 July 2020Mohammad Asghar Laura Anne Jones Death on 16 June 2020
No co-options occurred during the Second Assembly (2003–2007) and Sixth Senedd (2021-2026)
See also List of by-elections to the Senedd List of Welsh AMs/MSs with the shortest service Regional member changes in the Scottish Parliament
References