Keir Starmer stepping down: What investors should know
LONDON, ENGLAND – JUNE 22: Makerfield Labor MP Andy Burnham takes a “Selfie” with the Parliamentary Labor Party after being sworn in at the Houses of Parliament on June 22, 2026 in London, England. Last week Andy Burnham won 54% of the vote in the Makerfield by-election, paving the way for his return to Westminster as an MP and challenger to Prime Minister Keir Starmer’s leadership. (Photo: Dan Kitwood/Getty Images)
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British Prime Minister Keir Starmer announced on Monday that he would resign, opening the door to Britain’s seventh leader in 10 years.
In the process of replacing him as leader and prime minister of the Labor Party, a successor is expected to take office no later than September 1, and with a new administration comes a new set of economic and financial policies that markets will digest.
Here’s what investors need to know as Britain searches for its next leader.
First, the frontrunner.
Who is Andy Burnham?
Andy Burnham is the favorite to succeed Starmer. The mayor of Greater Manchester is running for leadership, winning a seat in the UK parliament in a special election last week.
On Monday morning, former health minister Wes Streeting, a potential rival for the prime minister, backed Burnham, boosting her chances of running unopposed, which would significantly shorten the process.
Burnham left parliament in 2017 to become mayor of Manchester, after serving in previous Labor governments and campaigning for the party leadership in 2015.
ASHTON-UNDER-LYNE, MANCHESTER – APRIL 13: British Prime Minister Keir Starmer meets with schoolchildren at a breakfast club with Manchester Mayor Andy Burnham during a visit to a primary school in Ashton-under-Lyne, Greater Manchester, northwest England, on April 13, 2026. During a visit to the breakfast club, the Prime Minister talks about the government’s policies to support families. (Photo: Paul Ellis – WPA Pool/Getty Images)
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The importance given to him by the mayoralty and his distance from the machinations of parliament earned Burnham the nickname “king of the north”.
Viewers see him as to the left of Starmer and previous comments about fiscal spending have unsettled investors.
“We have to move beyond the problem of being hostage to the bond market,” he said in an interview last September; This led to a sell-off in UK government bonds, and even then traders saw him as a potential future prime minister.
He later retracted the statement. “I never said you could ignore bond markets,” he told ITV News in May.
Why are gilt markets watching the transition?
Freeing government spending from the constraints of the bond market may be more difficult than Burnham anticipated, especially as Britain’s financial picture continues to deteriorate.
Yields on UK bonds, known as gilts, rose on signs the government could spend more. If Burnham becomes prime minister, she will inherit the same cash-strapped administration, limiting her ability to make big expenditures.
Yield movements may focus on the manner in which Starmer leaves rather than his successor’s policies, April LaRusse, head of investment specialists Insight Investment, wrote in a note.
“Recently the gilt market seems to be expecting a more pragmatic approach to changes in government policy,” he said.
“We expect the market’s focus will now be on who might be chosen for key cabinet positions, with the gold market likely to be most interested in the Chancellor and the potential timing of the next Budget.”
What could Starmer’s exit mean for sterling?
Here’s how GBP/USD has fared over 5 years.
The British pound is unlikely to move on from Burnham’s move to No. 10 Downing Street because it was “well predicted and heavily priced in”, according to Convera.
“A clearly defined crossover will likely be seen regularly,” Convera FX strategist Antonio Ruggiero wrote in a note.
“The downside risk lies on a more chaotic path. If no timeline emerges and attention shifts to a leadership fight that could force him to leave, heavier pressure on sterling could re-emerge.”
Monetary policy is sterling’s primary concern, with markets predicting the Bank of England will keep interest rates steady for the rest of the year.
Who will be the next chancellor?
Part of the reaction of bond markets and sterling to the new prime minister will be the choice of the finance minister, known in Britain as the chancellor. Current Chancellor Rachel Reeves may represent a low-risk option, signaling continuity, but she will reportedly be replaced.
Recent media reports indicate that former health minister Streeting and energy minister Ed Miliband, who led the party from 2010 to 2015, are potential candidates.
LONDON, ENGLAND – MARCH 26, 2025: (LR) Steve Reed, Secretary of State for Environment, Food and Rural Affairs, Ed Miliband, Secretary of State for Energy Security and Net Zero, and Wes Streeting, Secretary of State for Health and Social Care, depart from 10 Downing Street after attending the weekly cabinet meeting in London, England. (Photo: Peter Nicholls/Getty Images)
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“Fixed income investors will be quick to evaluate a new chancellor on whether he is cautious or adventurous,” Dan Coatsworth, head of markets at AJ Bell, said in a note.
“The bond markets want someone who is cautious and determined to balance the books. They don’t want someone to increase spending without giving enough thought to whether the country can afford it.”
“Equity investors will be hoping for a more pro-business chancellor than Reeves, who has presided over significant cost pressures on UK industries over the last two years.”
Why does UK growth remain a challenge?
A change in leadership does not automatically mean a change in the country’s economic fortunes.
Janus Henderson Smaller Companies fund manager Indriatti van Hien wrote after Starmer announced his departure: “The Prime Minister may be changing, but the problems facing the UK economy remain the same.”
“The next Prime Minister faces the inevitable challenge of stimulating economic growth while walking a tight fiscal tightrope. Energy policy and welfare reform need to be addressed to reduce the UK’s gilt yield premium, unlock funds for growth and ultimately attract capital flows back to the UK.”
