What would happen to UK stocks if Andy Burnham became prime minister?

While Burnham could face a difficult time in office, the appeal of UK stocks is fortunately not tied to the fate of the UK economyAndy Burnham appears destined to be the UK's next prime minister, and he could take office as early as July 17 if no Labour MP enters the race to challenge him

You may be concerned about the potential effects of a Burnham administration on your finances, particularly your investments. Since the FTSE 100 hit its all-time high of 10,935 on February 27, right before the Iran war broke out, the UK stock market has had an exciting year thus far. It fell off sharply over the following weeks, and while much of the lost ground was recovered by the end of March, it still has not regained its late February highs.

For a while now, UK stocks have been undervalued in comparison to their international counterparts. While this is advantageous for value-oriented investors, it is hoped that something will eventually trigger a revaluation so their prospects improve.

Is it more unfavorable news for the UK stock market, or could the country's seventh prime minister in ten years be that catalyst?

Watch full video here: "If Andy Burnham does get the keys to Number 10, he'll face a supremely tricky balancing act," said Susannah Streeter, chief investment strategist at wealth manager Wealth Club.

On June 29, the apparent prime minister-in-waiting gave a speech outlining his vision for the nation. The speech focused primarily on bolstering regional autonomy, but it was otherwise vague.

According to Streeter, "investors will be looking for a clearer roadmap showing how growth can be boosted sustainably without unsettling bond markets or placing further strain on already stretched public finances."

How UK stocks have reacted to the prospect of prime minister Burnham.

Burnham's ability to overcome these obstacles is widely doubted.

Equally, it is yet one more source of turbulence for a market that could probably do without it.

"I think what the markets would like to see is some stability," Jo Rands, portfolio manager on UK equity income at asset manager ClearBridge Investments, told BFIA.

However, it is noteworthy that Burnham emerged as Keir Starmer's nearly certain successor, and UK stocks have not responded significantly (in either direction) since he announced his resignation.

Rands pointed out possible nationalization issues that could affect the utilities sector as a whole, but there hasn't been much response, despite some industries feeling uneasy. On June 22, the day Starmer announced his resignation, the FTSE 100 gained 0.7 percent, and between June 22 and June 30, it increased by an additional 0.6 percent.

According to Rands, "the markets have been considering this possible change for a while." "Last year, we discussed the potential impact of local elections on the market and the risk to UK stocks. It has therefore been rumbling in the background."

In other words, uncertainty itself was already factored in. Who Burnham selects to succeed Rachel Reeves as chancellor is still up in the air and will probably have the biggest effect on the UK economy and UK stocks.

"A week ago, when you looked at the prediction markets, Wes Streeting was the favourite," said Rands. "That was a hit with the markets. However, according to Rands, Ed Miliband seems to have emerged as the more likely contender in the interim, and the markets are less interested in seeing him at number 11.

Whoever takes the role will be the primary person responsible for executing the precarious economic balancing act that Burnham will face an unenviable task.

Why UK stocks offer diversification.

The good news is that the UK economy is distinct from the UK stock market.

The large cap stocks of the FTSE 100 are predominantly global companies who derive their revenue from all over the world so they can perform strongly even if UK growth slows.

"A lot of people conflate UK equities with the UK economy," said Rands, adding that its often more the mid- and small-cap end of the UK market (accounting for around 12 percent of its total value) that are heavily exposed to the domestic economy.

UK stocks also offer rich sources of diversification. Compare the top ten holdings of the SandP 500 and the FTSE 100:

Based on weightings in the Vanguard FTSE 100 UCITS ETF (LON:VUKG) and Vanguard S&P 500 UCITS ETF (LON:VUAG), which track the corresponding indices, as of May 31.

Information technology companies make up five of the top ten holdings in the S&P 500, with two of the remaining five being represented by two distinct share classes of Alphabet. However, since all of the exceptions belong to the Magnificent 7 group of AI-relevant stocks, it's reasonable to say that, despite their official titles, they are all fundamentally tech companies.

In contrast, the top ten companies in the FTSE 100 come from six different sectors, none of which have more than two businesses.

"Global indices are predominantly US, which are predominantly tech," Rands stated. It is dispersed throughout several different sectors in the UK."