The following witnesses gave evidence. Transcripts can be viewed on the inquiry publications page of the Committee's website.
| Tuesday 27 February 2018 | Question number |
| Keith Cochrane, Chief Executive, Carillion, (Non-executive Director July 2015-July 2017), Philip Green, Chair, Carillion, Richard Howson, former Chief Executive, Carillion, 2012-July 2017, Emma Mercer, Finance Director, Carillion, from April 2017 | |
| Tuesday 13 March 2018 |
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| Michael King, Local Government Ombudsman, Nigel Kletz, Chair, National Advisory Group for Local Government Procurement, and David Simmonds, Conservative leader, Local Government Association | |
| Kerry Hallard, President, Global Sourcing Association; and George McFarlane, Confederation of British Industry | |
| Tuesday 27 March 2018 |
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| Professor Gary Sturgess, Nick Davies, Institute for Government, and Professor Colin Haslam, Queen Mary University of London | |
| Tuesday 24 April 2018 |
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| Sir Amyas Morse KCB, Comptroller and Auditor General, National Audit Office | |
| Margaret Stephens, former Partner on Private Finance Initiative at KPMG, and Paul Davies | |
| Tuesday 8 May 2018 |
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| Rupert Soames, Chief Executive, Serco, and Phil Bentley, Chief Executive, Mitie | |
| David Walker, The Guardian, Matt Dykes, Senior Policy Office for Public Services, TUC, and Karl Wilding, Director of Public Policy and Volunteering, NCVO | |
| Wednesday 9 May 2018 |
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| Right Hon David Lidington MP, Minister for the Cabinet Office and Chancellor of the Duchy of Lancaster, John Manzoni, Permanent Secretary for the Cabinet Office and Chief Executive of the Civil Service, and Gareth Rhys Williams, Government Chief Commercial Officer |