[2] John Darley was the sole Nick Xenophon Team member in the South Australian Parliament until he left the party to become an independent on 17 August 2017.

In late 2017, NSW-BEST, VIC-BEST, WA-BEST, QLD-BEST and NT-BEST were registered as business names, leading to speculation that the party would expand interstate.

[citation needed][6] The thirty-six House of Assembly seats contested were: Badcoe, Chaffey, Cheltenham, Colton, Croydon, Davenport, Dunstan, Elder, Elizabeth, Enfield, Finniss, Gibson, Giles, Hammond, Hartley, Heysen, Hurtle Vale, Kavel, King, Lee, Mackillop, Mawson, Morialta, Morphett, Mount Gambier, Narungga, Newland, Playford, Port Adelaide, Ramsay, Reynell, Schubert, Taylor, Unley, Waite, and Wright.

[14] Xenophon unsuccessfully contested Hartley and although he came second on the primary vote ahead of Labor's Grace Portolesi by 202 votes, the preference distribution of the eliminated fourth-placed Greens candidate turned Xenophon's 99-vote lead over Portolesi into a 357-vote deficit.

[16][17][18] In the upper house, SA-Best received 19.3% of the voted, securing two seats, with the election of Connie Bonaros and Frank Pangallo.