In the Market: Regulators look to pry open the dark corners of Treasury markets

By Paritosh Bansal

(Reuters) -In recent weeks top U.S. officials have raised concerns over a hedge fund trade that profits from tiny price differences in Treasuries, worried it could present a risk to financial stability. No one knows, though, how big that trade really is.

Researchers from the U.S. Federal Reserve and the Office of Financial Research (OFR) in late August wrote there were signs that the so-called basis trade had increased this year amid rising interest rates, approaching levels last seen in 2019.

The trade, inherently risky because hedge funds borrow heavily to juice their profits from it, is believed to have worsened market stress at the height of the pandemic in March 2020.

To arrive at the conclusion that the basis trade had ballooned once again, the researchers had to rely on a series of imperfect proxies, rather than data that could directly provide them information about it. That data doesn't exist.

Two market sources, one at a major bank and one at a hedge fund, said they didn't see the trade to be as big in their own books.

Therein lies a problem that has plagued the bedrock of global finance: Some important segments of the $26 trillion Treasuries market operate in the shadows. The lack of visibility makes policymaking harder and more contentious, leaving regulators sometimes with imperfect understanding and blunt tools that many in the industry argue can create new problems.

The problem is not lost on officials, who launched an extensive review of the market in 2021 to improve its resilience and transparency. Their efforts to collect more data are now starting to come together.

The next major milestone is expected early next year, with the OFR planning to finalize a rule to collect data on the largest segment of the short-term financing markets that underpin Treasuries. They currently don't have data about such trading, which happens bilaterally, between brokers and their customers, like hedge funds, through repurchase agreements, or repos.

Taken together with other steps, it will be a major advance in improving regulators' visibility into the market, but it will still leave some gaps.

"It's an issue of degree of transparency," said Darrell Duffie, a Stanford University finance professor who has studied the market in depth.

Duffie said more could be done, but added that the "official sector Treasury market datasets are far more comprehensive now than they were a few years ago."

An industry executive who is familiar with these issues described the work as foundational, but added that "it doesn't solve all the problems." Officials would have more information about transactions, but won't have the motivations behind all the different types of trades.