Jean-Claude Perrottet, the younger brother of former NSW premier Dominic Perrottet, fronted the NSW Independent Commission Against Corruption (ICAC) on 5 August 2026 as part of Operation Rosny — the watchdog's public inquiry into alleged electoral-funding offences and branch stacking inside the NSW Liberal Party's Reformers faction.

For the uninitiated, branch stacking is the practice of recruiting large numbers of party members — sometimes by paying their membership fees — to stack votes in favour of a particular faction or candidate. It is illegal under NSW electoral law when it involves prohibited donations. ICAC is the state body that investigates corruption in the public sector, including politicians and their staff.

The public hearings began on 27 July 2026 and are set to run for eight weeks. ICAC has published official transcripts for 31 July, 4 August and 5 August, with Perrottet appearing across multiple days, including the 5 August session (ICAC transcript, 5 August 2026). He gave evidence that he would, on occasion, pay for party memberships during his time with the Reformers (SMH, 5 August 2026).

The Reformers first surfaced publicly in 2019, when the Sydney Morning Herald reported on an alleged concerted effort by elements of the NSW Liberal Party's hard right to undermine sitting members in several safe state and federal seats across Sydney's north-west. The reports named Jean-Claude Perrottet and fellow staffer Christian Ellis, both then employed in the electorate office of Damien Tudehope, the minister for small business. The articles were the first public mention of the Reformers, described as a conservative group of Catholics alleged to be behind a branch-stacking operation financed by illegal donations (The Guardian, 5 August 2026).

Both Perrottet and Ellis left Tudehope's office within months of the 2019 article's publication. By that stage, Perrottet had already built a career inside the conservative Catholic wing of the parliamentary Liberal Party. In 2018, while studying commerce at the University of NSW, he had secured employment with upper house MP David Clarke, a figure long associated with the party's right faction. He returned to Tudehope's office in 2019, this time in the ministerial wing.

The path to ICAC ran through parliament. In 2022, NSW Liberal state MP Ray Williams, one of the MPs the Reformers were alleged to have targeted, used a late-night speech in the Legislative Assembly to raise allegations about the faction's activities. Two days later, Dominic Perrottet, by then premier, referred the Reformers matter to ICAC. The allegations encompassed attempts to dislodge the Hills Shire Council and claims that developer Jean Nassif had provided the Reformers with "significant funds". A parliamentary inquiry into Hills Shire Council followed, sitting in the months before the 2023 NSW election.

Operation Rosny has also heard evidence that NSW Liberal powerbrokers left their mobile phones in their cars before discussing factional matters, apparently to avoid tracing (The Guardian, 3 August 2026). The practice speaks to the level of operational discipline within the faction under scrutiny.

Jean-Claude Perrottet's personal history carries its own political weight. In 2015, following an end-of-year formal at St John's College, Sydney University, an alcohol-charged incident with a 19-year-old woman led to rape charges. In 2017, a NSW District Court jury took less than two hours to find him not guilty. He was 20 at the time. The Perrottet family is large: Dominic is one of 12 siblings, and Jean-Claude's appearance at ICAC places the former premier's family squarely inside the commission's frame, albeit as a witness rather than a person of interest.

The inquiry's scope, as outlined by ICAC, covers possible offences under the Electoral Funding Act alongside other matters. The commission has not indicated whether findings will be referred for prosecution; that determination typically follows the conclusion of public hearings and the assistant commissioner's report.

The broader context here matters. For the NSW Liberals, Operation Rosny lands amid ongoing organisational instability. The party lost government at the March 2023 election and has since cycled through opposition leadership. An eight-week public hearing into internal factional operations, with witnesses detailing paid memberships and phone-avoidance protocols, will test whatever institutional resilience the party has left.

The commission's timetable means evidence will continue well into September. More witnesses are expected as Operation Rosny works through the network of staffers, MPs and donors connected to the Reformers' activities in Sydney's north-west and the Hills District.