Iwan and Manuela Wirth, the co-presidents of the commercial gallery Hauser & Wirth – which last year opened a new space in Somerset – are number one in this year’s edition of the ArtReview Power 100, announced today.

Last year’s list was topped by Nicolas Serota, director of Tate, who this year drops to fifth, one behind Hans Ulrich Obrist and Julia Peyton-Jones, directors of Serpentine Galleries.

Artists who feature on the list, now in its 14th year, include Ai Weiwei (2), Marina Abramovic (8), Wolfgang Tillmans (11), Hito Steyerl (18), Theaster Gates (38), William Kentridge (81) and Rick Lowe (89).

Compiled by a 16-member international jury, the list claims to be ‘the most established ranking within the art world’, providing a ‘a unique snapshot of the contemporary art scene as it stands today’ and an ‘up-to-date analysis of the true meaning of power in the contemporary art world’.

Entrants are judged on their international influence over the production of art and their contribution to the art world during the past 12 months.

Other notable UK entrants include White Cube founder Jay Jopling (35), Sadie Coles (36), frieze founders Matthew Slotover and Amanda Sharp (49), and Toby Webster and Andrew Hamilton (50) from Glasgow’s The Modern Institute.

More on a-n.co.uk: 

A Q&A with… William Kentridge – Dany Louise speaks to the South African artist

2014 – How was it for you? #4 Alice Workman – The director of Hauser & Wirth Somerset looks back on a busy year