Sleepy Corner of U.K.’s Pension Industry Forced the Bank of England’s Hand

Sleepy Corner of U.K.’s Pension Industry Forced the Bank of England’s Hand

Plans by Britain’s new prime minister, Liz Truss, to cut taxes and freeze energy bills landed like a bomb in a niche corner of financial markets, hitting government bond prices so hard that the Bank of England was compelled to intervene, and highlighting how obscure derivatives can still shake up the global financial system more than a decade after the 2008 financial crisis.

On Wednesday, 30-year British government bonds swung more in a day than they had in a full year for the past five years — the biggest one-day move on record. In currency markets, the pound slumped to its lowest level on record against the U.S. dollar, coming close to parity, with moves of a magnitude comparable to the onset of the coronavirus pandemic.

“It is the most extreme market event that I have been involved in,” said Simon Bentley, head of U.K. client portfolio management at the asset manager Columbia Threadneedle, who started working in finance just before the dot-com bubble burst in 2000.

It all started last Friday when Kwasi Kwarteng, the chancellor of the Exchequer, announced Britain’s biggest tax cuts since the 1970s, predominantly for high earners. The package also included a new cap on energy prices to help households facing a winter fuel crisis. Investors had been bracing for the moves, but the announcement was unexpectedly thin on details about how the government would finance its plan. Fears that the government would have to increase its borrowing pushed down the price on its existing debt, and sank the value of the pound.

Prices move inversely to bond yields. Within 30 minutes of the British government’s announcement, the yield on 30-year government bonds, also known as gilts, soared, moving more than it typically does in a full day. The market reaction ricocheted around the world. U.S. government bond yields also rose, and stocks fell.

As turmoil increased, it exposed vulnerabilities in the financial system. Although investors initially sold off bonds because of the uncertainty, those moves caused upheavals among pension plans, amplifying the sell-off like a pileup.

The pension fund business is seen as a stolid part of the financial world. But because these funds manage so much money, their distress can affect wider markets. In particular, it was the $1.5 trillion defined-benefit pension plan industry that came into focus this week. These pensions, popular in Britain, pay a fixed sum, linked to inflation, to retirees in the future.

Over the long term, interest rate swings can change the picture for pension funds. When interest rates rise, bond prices fall and pensions’ liabilities — essentially the money they owe retirees in the future — decrease in value. But when rates drop, the opposite happens, so the funds have to generate more cash going forward to cover their liabilities.

To guard against that risk, pension funds have increasingly turned to what’s called a liability-driven investment strategy, a way of using derivatives and other products linked to gilts that hedge against a drop in interest rates.

Derivatives work by tying their value to that of an underlying asset, in this case gilts. And they are cheaper to purchase than the underlying bonds, so pensions can own more of them. That’s what the British pension funds did, building large positions that also made them more sensitive to changes in bond yields.

The strategy emerged in the late 1990s and grew in popularity as interest rates tumbled after the 2008 financial crisis. These complex financial instruments are structured so that the party on the other side of the trade would pay the pension fund when bond prices rose, but the pension fund would have to pay the counterparty when bond prices fell.

Last Friday, after the U.K. government announced its plan to cut taxes, yields on gilts shot up as prices fell. The asset managers who oversee the holdings of pension funds began asking them for more cash to cover the change in value. By the end of Monday, the yield on 30-year gilts had risen another 0.5 percentage points — a huge move for an asset that usually moves in the low hundredths of a percentage point. Asset managers began to press pension funds to post collateral so that they could cover the losses on the derivative contracts.

The moves were so sharp that Mr. Bentley of Columbia Threadneedle, one of the largest asset managers that facilitates these trades for pension funds, alerted the Bank of England, he said.

“We wanted to make sure it was crystal clear what we were seeing in markets,” he said.

But pension funds, especially smaller ones, don’t always move quickly. It can take them a couple of weeks to sell assets — including stocks, corporate and government bonds — to raise the money for collateral.

“Managers were asking for more collateral, but they couldn’t wait two weeks,” said Dan Mikulskis, a partner at LCP, which advises pension funds. “They wanted it in two days, or even sooner. That puts a lot of strain on the system.”

Then on Tuesday, asset managers still waiting for collateral and running out of time began to close out their trades, putting further pressure on the market because exiting such trades replicates the effect of selling more gilts, amplifying the sell-off.

Columbia Threadneedle said it had to unwind a “small amount” of trades when clients were unable to come up with the cash needed to cover losses. BlackRock, another large asset manager for these pension funds, sent a memo to its clients on Wednesday morning, saying that for funds close to seeing their assets exhausted, they would close out the trades.

“That is what led to concern from folks like ourselves,” said David Fogarty, a director at Dalriada Trustees, which operates pension funds on behalf of its members. “If a position is closed out, we no longer have the protection” from a fall in bond yields.

Asset managers pleaded with the Bank of England to intervene. By 11 a.m. on Wednesday, they got their wish.

The central bank pledged to buy government bonds at a rate of up to $5 billion a day for the next 13 weekdays, in an attempt to restore proper market functioning. The decision scuppered plans to sell bonds that the bank had previously purchased as part of pandemic-era support for financial markets. It didn’t take long for the markets to return to normal. The yield on the 30-year gilt fell more than a percentage point on Wednesday.

As markets calmed, pension funds began to assess the damage.

While the scale of the fallout is still being calculated, the drastic rise in yields initially benefited pensions because it reduced the value of their future liabilities. But the moves were so sharp and fast that pension funds didn’t have time to adjust and post more collateral on their derivatives positions, according to industry players.

“Until the dust settles and the L.D.I. managers start to disclose all the activities taken on behalf of their clients, it will not be quite clear what the impacts have been at a plan level,” Mr. Fogarty said.

The industry had been warned of such risks more than a decade ago as regulators introduced rules requiring more collateral to cover derivatives trades, prompting concern that some sleepier parts of financial markets weren’t set up to meet the new rules.

Now, as interest rates rise, these vulnerabilities are being tested. While this past week’s market moves were extreme, they came in a year of soaring government bond yields worldwide. The wild swings have raised worries about the fragility of the financial system, as well as questions over central banks’ ability to pull back from bond-buying programs that helped to soothe market turmoil during the pandemic.

“It’s a huge event for the U.K., but it’s also a huge event for central banks around the world,” said Sam Lynton-Brown, head of global macro strategy at BNP Paribas.

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