For three decades, New Zealand’s wealthiest business figures have treated MMP as weather: annoying, occasionally destructive, but something you plan around. That has changed. A campaign led by Zuru patriarch Harry Mowbray is no longer trying to win under proportional representation. It is spending to replace it.
The clearest picture comes from a weekend gathering at the Coatesville mansion of Zuru co-founder Nick Mowbray and Jaimee Lupton, where Newsroom reports guests signed “Split Your Vote” t-shirts left on the kitchen bench. The guest list included property developer Matthew Horncastle, private equity investor and NZME director Jim Grenon, PR consultant Neil Waka, lawyers Patrick Winkler and Samira Taghavi, and former National and Act leader Don Brash. Poolside, Mowbray made the pitch plain: “I can guarantee you a right wing government for the foreseeable future.”
From grumbling to a registered war chest
The money tells you this is not a one-off. According to The Post, the Split Your Vote website spent $17,000 on social media influencers, including Chantelle Baker. A second entity, Restore Civic Responsibility, is now a registered Electoral Commission promoter able to spend up to $424,000 during the regulated period.
Registration and a six-figure spending authority are infrastructure, not a tantrum. Add the family’s political giving, Nick Mowbray donated $250,000 to National and $225,000 to ACT in 2026, the single largest individual donation to National that year, and you have a donor operation that has decided the operating system is the problem.
The proposed replacement, RNZ reports, is a supplementary member system: 100 electorate MPs elected under FPP or STV, plus just 20 proportional list MPs. ACT and NZ First back it. National does not.
Gaming the exception to kill the rule
The campaign’s first move was tactical. In September, The Post explained the Mowbray strategy: ACT and NZ First voters give electorate votes to National candidates while some National voters hand their party vote to the minor partners, exploiting the overhang to generate 10 to 30 extra MPs without winning a single additional voter.
It partly worked. Preliminary results showed National candidates running 13 points ahead of their own party vote, up from 5.6 points, producing a seven-seat overhang. National campaign chair Simeon Brown credits strong local candidates. Mowbray calls that “a load of rubbish”.
The irony is hard to miss. Both the 2012 MMP Review and the 2023 Independent Electoral Review recommended abolishing the overhang and coat-tailing provisions to make the system more proportional. The campaign is using the loophole officials wanted closed to argue proportionality itself should go.
National is not playing ball
The most telling tension is with the party supposed to benefit. National formally complained to the Electoral Commission over Mowbray’s online advertising, which was referred to police. Mowbray conceded the breach and later obtained written sign-off from ACT and NZ First.
He has since accused National of a “self-centred” refusal to embrace the strategy, said there is “zero question” vote-splitting is the only reason it can govern, and hinted the family’s donations could dry up if the party will not cooperate. With around 400,000 special votes outstanding, he warns the right could still need The Opportunity Party.
A major donor publicly threatening to defund the main centre-right party unless it adopts his electoral engineering is not a sign of a healthy relationship between capital and politics. It is leverage, used openly.
Why business should be sceptical
The frustration underneath this is real and widely shared. Coalition bargaining slows decisions, minor parties extract concessions out of proportion to their vote, and investors pay for the uncertainty. A case for electoral reform can be made on those grounds.
But that is not the case being made. The pitch at Coatesville was a guaranteed outcome for one side. Rules sold on partisan advantage invite the next government to rewrite them back, and nothing is worse for long-horizon capital allocation than an electoral system treated as a spoil of victory. Business wants durable settings, not a constitution that flips with the donor cycle.
The history is unkind too. In the 1992 referendum, supplementary member voting attracted just 5% support against 65% for MMP. Mowbray says MMP wastes at least 870,000 National votes. Voters may see it differently once they learn who is paying for the argument.
What happens next
The special votes will decide whether the overhang gamble delivers a governing majority. Either way, the campaign now has the structure to outlast this election. The question for the wider business community is whether it wants its name attached to a project whose clearest promise is permanent advantage for one camp. A reform that cannot win on its merits, and needs the beneficiary party dragged along by its donors, is not a stable foundation for anyone’s next investment decision.
Sources
- Newsroom: In the Zuru mansion with the rich listers behind the new campaign to get rid of MMP (2026-11-08)
- RNZ: Harry Mowbray calls Coatesville mansion summit to get rid of MMP (2026-11-05)
- The Post: Final days of campaign descend into turmoil as vote-splitting advocates engineer an MMP crisis (2026-11-08)
- The Post: Harry Mowbray hints money could dry up if ‘self-centred’ Nats don’t accept overhang strategy (2026-11-07)
- The Post: Why the Mowbray plot to skew the election probably won’t work (2026-09-25)
- The Conversation: Just politics or the ‘opposite of clever’? The risks and rewards of strategic voting
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