UK PMI stagflation signal limits scope for clean rates rally

Why this is not a simple growth scare

A conventional weak-PMI trade would be to buy duration, mark down the currency and support rate-sensitive equities on expectations of earlier easing. September’s survey complicates that template. S&P Global said the PMI implied about 0.1% quarterly GDP growth at September’s pace and a still-subdued 0.2% expansion for the third quarter as a whole.³ Reuters reported the same 0.1% signal, contrasting it with 0.4% growth in the second quarter.⁴

But the price data point the other way. S&P Global said supply-chain constraints, wage pressure and higher energy prices pushed average selling prices higher, with overall inflation gauges at their highest since June and services price pressure especially troubling for the BoE.³ Reuters added that services companies, the backbone of the UK economy, raised prices at the fastest pace in four months as energy-related cost pressure accelerated.⁴

For rates investors, the front end cannot simply price weaker activity in isolation. Markets were already assigning roughly a 60% probability to a BoE rate increase on 5 November, according to Reuters and Investing.com coverage of the PMI reaction.⁴¹ The survey therefore reinforces a policy bind: growth is not strong enough to protect earnings, but inflation is firm enough to limit the relief that gilts and rate-sensitive equities would normally expect.

Equity risk: index resilience, domestic fragility

The UK equity read-through is uneven. The FTSE 100 can absorb a soft domestic PMI better than the FTSE 250 because its earnings base is global and commodity-heavy. On 23 September, oil strength lifted BP and Shell, while defence names also advanced, helping the blue-chip index look resilient despite the weak domestic signal.⁹ Trading Economics also identified BP and Babcock among the leading gainers on the day.²

That does not mean UK equities are ignoring the macro risk. It means the benchmark may be a poor expression of it. The bigger vulnerability sits in retailers, leisure, housing, banks, real estate, small caps and mid-caps that depend on domestic volume growth, consumer confidence and refinancing conditions.

S&P Global’s survey commentary cited high energy prices, elevated business costs, geopolitical worries, higher borrowing costs and uncertainty ahead of the autumn Budget as drags on growth.³ Those are the inputs that pressure margins and reduce companies’ willingness to hire, invest or guide aggressively.

The hiring signal is particularly relevant for domestically exposed earnings. S&P Global said subdued confidence and high costs continued to discourage hiring, with the employment index still indicating falling employment.³ If labour demand remains weak, household income momentum may soften. If wage and input costs stay elevated, margins get little offset. That is a difficult backdrop for sectors priced for a consumer recovery.

Gilts: sticky costs blunt the duration case

Gilts face a different but related problem. Slower activity would usually favour lower yields, especially if investors believe the next policy move is down. Yet September’s PMI price indicators argue against declaring victory on inflation. S&P Global said the renewed intensification of price pressures, especially in services, would add to calls for higher rates, while lacklustre output would increase concern about the damage from higher borrowing costs.³

That is a classic bear-flattener or volatility setup, not a clean bull-steepener. If investors focus on inflation and BoE reaction risk, short-dated gilt yields remain vulnerable. If they focus on growth damage, longer maturities may eventually find support, but only if inflation expectations stay contained. The market cannot confidently price either side while the data point to both weaker activity and sticky services inflation.

The day’s market action underlined that discomfort. Investing.com’s snapshot showed UK government yields higher across the 2-year, 5-year and 10-year tenors, even as the PMI signalled slower growth.¹ That is the key market message: investors treated the release less as an easing trigger than as evidence of an awkward inflation-growth trade-off.

Sterling and imported inflation

Sterling weakness adds another complication. Alliance News reported the pound down at USD1.3254 from USD1.3342 a day earlier, while Investing.com also noted GBP/USD weakness after the PMI release and broader market stress.⁹¹ A weaker currency can help overseas earners in the FTSE 100, but it can also raise import-price pressure and complicate the BoE’s inflation task.

For domestic sectors, sterling depreciation is not an unambiguous positive. Retailers, leisure operators and consumer-goods distributors with imported inputs may face another cost channel just as demand momentum slows. That supports the core point: the PMI is not giving markets a clean disinflationary slowdown. It is pointing to weaker real activity with cost pressures still alive.

The market risk: underpricing a low-growth, high-cost regime

The biggest risk is that investors continue to separate the two halves of the PMI message. Equity investors may treat the above-50 reading as evidence that the expansion remains intact. Rates investors may treat weaker activity as an eventual easing signal. Both interpretations are incomplete.

A composite PMI of 51.7 is not recessionary, but it is soft enough to restrain earnings upgrades, especially for businesses tied to UK volumes. At the same time, rising services prices and persistent wage, energy and supply-chain pressure reduce the probability of swift monetary relief.³⁴ That mix argues for selectivity: favour globally diversified earners and firms with pricing power, be cautious on leveraged domestic cyclicals, and avoid assuming gilts will rally simply because growth is cooling.

The September PMI therefore looks less like a turning point toward easing and more like a warning that the UK is drifting into a sticky-cost slowdown. Until inflation pressure eases more convincingly, weak growth alone may not be enough to deliver the policy support UK risk assets want.