Real estate agent Ralph Babet became the first and only UAP candidate to gain a seat in parliament after claiming the final Victorian spot available.
Babet took the spot from Liberal candidate Greg Mirabella, who was only sworn into the Senate in February.
UAP founder and backer Clive Palmer reportedly spent in excess of $100 million in advertising for the 2022 federal election, of which Babet was the only successful candidate.
The party said on Facebook Babet would “take the fight to the mainstream parties to deliver a better economic future for all Australian families”.
Meanwhile, Labor won three of the six available seats up for grabs in Western Australia.
Fatima Payman snared the sixth and last position for the ALP, while the Liberals won two seats and the Greens one.
The former refugee is the first hijab-wearing Muslim woman elected to parliament in Australia.
She said she was “proud” to win the seat.
The results mean the Albanese government will have 26 seats in the upper house this term, compared to the Coalition’s 32 and Greens’ 12.
The Jacquie Lambie Network and One Nation both have two senators, while the United Australia Party has one.
Independent David Pocock is in the remaining seat.
That makeup of the senate means that if Labor gains the support of the Greens plus one other senator, it will be able to pass legislation through the upper house regardless of how the opposition and remainder of the Senate votes.