Campaigners have urged Norway’s giant state investment fund to pressure cladding firms and builders to fix fire safety issues.
Grenfell survivors and leaseholders affected by the cladding crisis called on Norges Bank to pull £5.7bn of funds from companies if they fail to do so.
Lucy Brown-Cortes of the End Our Cladding Scandal campaign said pressure from shareholders was “overdue”.
The crisis has left many people with huge bills to fix unsafe homes.
After the Grenfell fire, which killed 72 people in 2017, flammable cladding and other fire safety defects were discovered in hundreds of blocks of flats across the UK.
Removing cladding can cost millions of pounds per block. The cost has often been passed on to flat owners under the leasehold system in England and Wales.
Many leaseholders have also seen sharply increasing service charges, and some have had to pay for so-called “waking watch” fire wardens.
A letter was sent to the boss of Norges Bank Investment Management (NBIM) demanding action on Friday, as first reported by the Sunday Times.
Its signatories include End Our Cladding Scandal, UK Cladding Action Group, Grenfell United, Action for Fire Safety Justice, the National Leasehold Campaign, Leasehold Knowledge Partnership and Tory MP Sir Peter Bottomley.
“This crisis has meant that at least 3,000,000 leaseholders are trapped in flammable flats they cannot sell, they are financing interim fire safety costs that they cannot afford to pay, and facing repossession/forfeiture over life-changing bills to make homes safe,” the letter says.
Nicolai Tangen, the chief executive of NBIM, should “leverage its position as major shareholder”, it says, to push 11 firms to fix safety issues and provide compensation to victims of the Grenfell fire.
NBIM should “divest its holdings in these firms if they fail to do so”, the letter adds.
The fund is an investor in three companies that were involved in producing materials used on Grenfell Tower: Kingspan, Arconic and Saint-Gobain.
NBIM also has stakes in different housebuilders, as pointed out by the campaigners, such as Barratt, Bellway, Berkeley, Crest Nicholson, LendLease, Persimmon, Taylor Wimpey and Vistry.
Housing Secretary Michael Gove backed the campaigners’ “call to action” on Sunday.
“Developers and cladding companies who caused these problems must pay to fix them. We want these companies to do the right thing and help end this scandal,” he said.
It was confirmed on Monday that firms would be given until March to agree how to help leaseholders trapped in “unsellable homes”.
Mr Gove warned those who had mis-sold unsafe cladding or cut corners on homes that the government was “coming for you”.
Residents in blocks 11-18m high had been ineligible for government support to remove unsafe cladding, but the Housing Secretary said earlier this week that the government was scrapping “the proposal for loans and long-term debt for medium rise leaseholders”.
Mr Gove said some building companies had shown leadership and covered the costs but others “had not shouldered their responsibilities.”
Ms Brown-Cortes told the BBC that campaigners wanted to see NBIM “live up to their environmental, social and governance (ESG) credentials and leverage their position” as a major shareholder in some property developers.
The biggest sovereign wealth fund in the world promotes itself as a “responsible” investor in more than 9,000 companies globally. It has previously cut tobacco companies from its portfolio, for example.