The party is set to go from one MP to ten, after winning Epsom and soaking up eight percent of the party vote.
Leader David Seymour says the defeat of the right overall is disappointing.
But he told Kerre McIvor Act have proven they can still influence government policy from the opposition.
"Labour said they were going to introduce hate speech laws, Act really led a campaign against that.
"We played an honourably role of protecting freedom of speech."
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