By Samantha Delouya, CNN

(CNN) — A long-held stake by a handful of hedge funds may finally yield returns under the Trump administration, but it risks sending shockwaves through America’s $12 trillion mortgage market.

Last month, President Donald Trump said he had plans to take mortgage financing giants Fannie Mae and Freddie Mac public. Such a move would end 17 years of federal government conservatorship over the two companies, which have played a central role in America’s housing finance system by providing liquidity to the mortgage market.

Some experts warn that severing Fannie and Freddie from government control could raise mortgage rates and restrict access to popular mortgage products — like the 30-year fixed loan — at a time when housing affordability remains out of reach for many Americans. Last week, Senate Democrats sent a letter to William Pulte, who leads the Federal Housing Finance Agency, asking him to pause efforts to take the two public, citing the risk that it could increase costs for homebuyers.

A group of investors has been anxiously awaiting the day Fannie and Freddie return to the public markets. None has been more vocal than billionaire investor Bill Ackman, whose hedge fund, Pershing Square Capital, is one of the largest holders of common shares in Fannie and Freddie.

“We have been leading the charge on behalf of all (Fannie and Freddie) shareholders to help them to exit from conservatorship,” Ackman posted on social media on Tuesday. A representative for Ackman pointed to his commentary on social media when asked about Pershing Square’s current stake.

Ackman isn’t the only hedge fund investor who bet on Fannie and Freddie after the government seized them during the 2008 financial crisis, when both were on the brink of collapse.

Other investors, including billionaire hedge fund managers Carl Icahn and John Paulson, have previously disclosed stakes in Fannie and Freddie, though neither responded to CNN’s request for information about the current size of their stakes.

Taking the two mortgage giants public may be challenging, said Lori Goodman, a fellow at the Urban Institute, who has studied the history of Fannie Mae and Freddie Mac.

Together, Fannie and Freddie’s total net worth is more than $150 billion. Goodman estimates any public offering of Fannie and Freddie shares would likely eclipse the largest IPO in history: state-owned oil company Saudi Aramco, which raised $26 billion when it went public in 2019.

“This is an enormously complicated undertaking,” she said.

Fannie and Freddie were never meant to permanently remain in a conservatorship arrangement, but Trump failed in an initial attempt to spin them off during his first administration.

Investors are wagering that his next try will be successful. Shares of Fannie (FNMA) and Freddie (FMCC), which trade over the counter, surged after Trump was elected in November. In the last year, shares of Fannie’s stock are up nearly 500% and Freddie’s gained nearly 400%.

Homebuyers could pay more

Fannie and Freddie essentially grease the wheels of America’s home lending market, one of the world’s largest, by buying mortgages from lenders and repackaging them for investors. This helps enable a reliable flow of money to mortgage lenders, allowing them to offer more affordable rates to would-be homebuyers. Today, the mortgage giants guarantee more than half of America’s mortgages, according to the FHFA.

Goodman said she expects that any plan to take the companies public would lead to higher borrowing costs for homebuyers.

The risk is that spinning off Fannie and Freddie could unsettle investors without the assurance of a government backstop, like the one provided during the 2008 crisis. In response, lenders might demand higher rates, especially from lower-income borrowers.

“You’ve got a trillion-dollar mortgage-backed securities market, both single-family and multi-family, that they’re a critical part of,” Goodman said of Fannie and Freddie. “You can’t tamper with the government guarantee without upsetting that huge market.”

Last month, Trump addressed the issue of the government’s guarantee, writing on social media: “I am working on TAKING THESE AMAZING COMPANIES PUBLIC, but I want to be clear, the U.S. Government will keep its implicit GUARANTEES, and I will stay strong in my position on overseeing them as President.”

But a social media post might not be enough to assure investors in the multitrillion-dollar mortgage-backed securities market, Goodman said. It is possible that Fannie and Freddie could pay a fee to assure the government’s guarantee long-term, but that cost would also likely be passed on to homebuyers, she added.

Any rise in mortgage rates would likely be unwelcome news to prospective homebuyers, who have been grappling with elevated borrowing costs since the Federal Reserve hiked its benchmark interest rate in 2022 to combat inflation. Mortgage rates, which track the 10-year Treasury yield, have recently been climbing again as growing concerns about the national debt and Trump’s tariff policy have fueled fears of an economic slowdown.

Democrats have criticized the Trump administration’s plans to overhaul Fannie and Freddie. Last week’s letter to Pulte, the Federal Housing Finance Agency director, accused the Trump administration of being primarily motivated by “rewarding President Trump’s billionaire campaign contributors.”

“We have serious concerns that you plan to make significant changes to the Enterprises in a way that would put investor profits over the homes of millions of Americans,” Senate Democrats wrote in the letter.

There is also the question of whether it makes sense to release Fannie and Freddie into the public market in their current form, said Norbert Michel, a director at the Cato Institute, a libertarian think tank.

“This system of privatized profit and socialized loss is what led to the 2008 crisis in the first place,” Michel said. “Under no circumstances should they be released as they were prior.”

“That was a bad system. We should not have that system,” he added.

A risky trade

It remains unclear what exactly the Trump administration plans to do with Fannie and Freddie, which means it’s also unclear whether hedge fund stakes, such as Ackman’s, are worth anything at all.

That’s because, as part of the conservatorship agreement, the US Treasury owns a preferential stake in Fannie and Freddie that takes priority over all other shareholders: Fannie and Freddie must pay back a $190 billion debt to the government for its bailout assistance before it can exit its conservatorship, which would prevent other shareholders from making a profit.

Ackman has advocated for the removal of the government’s preferred shares, arguing that Fannie and Freddie have already paid back more money than it cost to bail them out. Since entering conservatorship, the two companies have paid $301 billion in dividends to the Treasury.

“(Fannie and Freddie) shareholders don’t have their hands out. The opposite is the case,” Ackman wrote last week on social media. “(Fannie and Freddie) shareholders are simply seeking credit for payments that have already been made to the government so that a release from conservatorship can occur.”

But financial analysts say investing in Fannie and Freddie is risky.

“At the moment, on an economic basis, the private shareholders’ equity is about negative $200 billion, because that is what Fannie and Freddie owe the government,” said Bose George, a managing director at Keefe, Bruyette & Woods, a boutique investment banking company. “Owning the shares is speculative because you’re making an assumption that the government is going to forgive this debt.”

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