S&P Closes H1 Up 18.6%, PCE Re-accelerates & UK Flirts With Recession
The best first half for US stocks since 2019 — but driven by five companies. US inflation ticked back up. And the UK economy just contracted for the second time in four quarters.
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Finance Explained Simply The Brief 3 things that moved markets this week · 4 min read |
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01 Markets ↑ H1 Close S&P 500 Closes H1 Up 18.6% — The Best First Half Since 2019, Driven Almost Entirely by AI The first half of 2026 officially closed with the S&P 500 up 18.6% for the year. The Nasdaq gained 24%. But the story beneath the headline is one of extreme concentration: the equal-weighted S&P 500 (which gives every stock the same weight) rose only 8% — less than half as much. Nvidia, Microsoft, Alphabet, Meta, and Amazon drove almost all the gains. The average S&P 500 stock had a perfectly ordinary half-year. What this means for index investors: If you own an S&P 500 index fund, your H1 returns were excellent — but heavily dependent on 5 stocks. If any of those five stumble in H2, the index will feel it disproportionately. | |
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02 Inflation ↑ Re-accelerates PCE Ticks Up to 3.9% — Core Inflation Has Not Fallen in Six Consecutive Months May’s PCE inflation came in at 3.9% year-on-year — up from 3.8% in April, and the highest reading since November 2025. Core PCE (which strips out food and energy) also ticked up. The six-month trend is now unambiguous: inflation stalled in early 2026 and has since begun to slowly re-accelerate. The Fed’s premature rate cuts in 2024–25 are partly to blame, as lower borrowing costs reignited spending in rate-sensitive sectors. The Fed’s problem: With the S&P at all-time highs and unemployment at 3.9%, tightening further has real economic costs. Not tightening risks entrenching inflation at 4%.
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03 UK Economy ↓ Recession Risk UK GDP Contracts 0.1% in Q1 — Two Quarters of Near-Zero Growth Deepens Recession Fears Revised Q1 GDP data confirmed the UK economy shrank by 0.1%, following 0.1% growth in Q4 2025. Business investment fell 2.3%. Consumer confidence is at its lowest since early 2023. The UK is not technically in recession (two consecutive quarters of negative growth) — but it is uncomfortably close. The contrast with the US, which grew at 2.3% annualised in Q1, is stark and worsening. The structural issue: The UK’s variable-rate mortgage market means higher rates immediately reduce household cash flow, squeezing spending harder and faster than in fixed-rate markets like the US.
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