Wood shadow cabinet
Leanne Wood became Leader of the Opposition in the National Assembly for Wales after Plaid Cymru became the largest party not in government after the 2016 National Assembly for Wales election. 12 Plaid Cymru AMs were elected, as opposed to 11 Welsh Conservative AMs.
Plaid Cymru had not formed the official opposition since the Shadow Cabinet of Ieuan Wyn Jones, ending in 2007, having been in government from 2007-2011 and the third largest party from 2011-2016. Wood had served as leader of Plaid Cymru since 2012, and appointed her Shadow Cabinet in May 2016.
In October 2016, Dafydd Elis-Thomas left Plaid Cymru, moving to sit as an independent AM. This tied Plaid Cymru and the Welsh Conservatives on 11 seats, meaning no official opposition was formed. In April 2017, Mark Reckless joined the Welsh Conservative group in the Senedd, meaning the Welsh Conservatives now formed the official opposition, leading Andrew RT Davies to form his Second Shadow Cabinet.