Simon Anderson has been a supporter of the Green Party for the past 10 years.

The Green Party has fronted up two of its secret campaign donors as pressure mounts on the bigger parties to do the same.

New analysis by Stuff shows more than 80 per cent of donations to the two big parties are from donors whose identities are undisclosed.

Stuff is calling for transparency in political funding so the identity of all donors be promptly disclosed to the Electoral Commission.

HANNAH PETERS/GETTY IMAGES Green Party leader James Shaw said the $15,000 threshold for disclosure was too high.

Wellington-based IT consultant Simon Anderson had been supporting the Greens for the past 10 years.

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SUPPLIED Chris Gadd thinks there should be transparency in political donations.

He supports increased transparency in regards to political donations. "For the past three to four years I've made more sizeable donations," he revealed.

Are you a political donor who wishes to endorse transparency by speaking out? Email newstips@stuff.co.nz

Anderson makes a monthly donation and larger one annually. "It's probably around $2500 all up yearly, but this year I gave $5000 due to it being an election year," Anderson said. "I certainly think people shouldn't be hiding behind donations."

Auckland-based Chris Gadd works at Vodafone in their technology department and had been making donations to the Green Party since the last general election in 2014.

He wouldn't disclosed the set amount he donates but it was less than $5000, he said.

He also called for increased transparency in regards to political donations. "80 per cent of the big party funding is anonymous – I think it should be the other way round."

He started donating as he was "fed up" with the current Governments stance on climate change.

Both Gadd and Anderson also volunteer for the Green Party, whether door-knocking or passing out leaflets.

"It's important to me to support the party in both ways," Anderson said.

The Greens supported a greater transparency in political donations.

Green Party leader James Shaw said the $15,000 threshold for disclosure was too high and the public should be consulted on a new, lower threshold.

The party has previously put that number at $1000.

"We'd like to see more transparency around political donations. That needs to happen for all political parties at the same time, so none are disadvantaged."

"I can't see any good reason why disclosure of big donations can't happen faster too, like week-to-week."

The Greens publicly disclose where most of their money comes from, but the big parties keep it under wraps. 83 per cent ($8.7 million over six years) of the money donated to National is from anonymous donors, and 80 per cent ($2.8m) of that donated to Labour.

In the past the Green party turned down donations from the oil and gas industry as they didn't fit with the party's values, Shaw said.