Welcome to this week’s Market Pulse, your 5-minute update on key market news and events, with takeaways and insights from the Sidekick Investment Team.
Today, we’re looking at AI bottlenecks pushing memory chipmakers into the trillion-dollar club, what low UK birth rates mean for government borrowing costs, and the ECB’s warning about structural shifts in the global financial system.
But first, our number of the week…
€10 billion
That’s how much French AI startup Mistral plans to spend on data centre capacity over the next few years, a staggering sum for a company most recently valued at €11.7 billion.
Sidekick Takeaway: Mistral is betting that Europe’s AI future runs through its industrial base, recently signing deals with Airbus and BMW to bring AI into manufacturing. The company’s substantial capex commitment shows that AI infrastructure demand is increasingly going global.
Only have a minute to read? Here’s the TL;DR:
- Memory chipmakers SK Hynix and Micron both crossed a $1 trillion market cap this week as AI bottlenecks hit memory chips, which GPUs rely on. With three companies controlling the memory market and shortages expected through 2027, the industry is becoming a structural AI chokepoint.
- England and Wales recorded roughly 585,000 live births in 2025 – the fewest since 1977 – with the fertility rate falling to a record low of 1.39. The data underscores a growing fiscal challenge: a shrinking workforce resulting in weaker tax receipts and higher welfare spending, putting long-term pressure on government bond yields.
- The ECB’s latest financial stability review warned that the global financial system is becoming more fragile. With geopolitical shocks arriving more frequently, hedge funds playing a bigger role in sovereign bond markets, and lending migrating into private credit, the report suggests that systemic vulnerabilities are growing.
It’s important to note that the content of this Market Pulse is based on current public information which we consider to be reliable and accurate. It represents Sidekick’s view only and does not represent investment advice - investors should not take decisions to trade based on this information.
Memory Lane: AI Bottleneck Pushes Memorymakers Into Trillion-Dollar Club
This week, memory chipmakers SK Hynix and Micron both eclipsed a $1 trillion market cap for the first time.
SK Hynix is up more than 1,000% in twelve months. On Tuesday, Micron posted its biggest single-day gain in 15 years.
The companies were pushed into the trillion-dollar club thanks to structural bottlenecks in AI development.
Just as models rely on GPUs, GPUs rely on memory chips. And with three companies dominating the memory market, they’re reaping huge rewards from AI growth.
Three companies, one chokepoint
SK Hynix, Samsung, and Micron now control the critical supply chain feeding the global AI buildout:
- SK Hynix accounted for 57% of high-bandwidth memory revenue in 2025, with Samsung and Micron splitting the remainder. Analysts expect memory shortages to persist through 2027.
- Samsung hit a $1 trillion valuation earlier this month. With SK Hynix and Micron now joining the club, the list of companies worth over a trillion dollars has stretched to 14.
- Memorymakers are increasingly navigating labour and resource challenges to keep production moving. Samsung’s chip workers just ratified a landmark pay deal averaging roughly $340,000 in bonuses, narrowly averting a strike.
In the past, the memory industry was largely seen as a cyclical commodity play.
Now, it’s becoming a structural AI chokepoint, generating enormous wealth in the process.
Sidekick Takeaway: Each phase of the AI buildout has revealed a new bottleneck: first the models, then the processors, and now memory. The question is what bottleneck might emerge next – whether fabrication, lithography, or the raw materials that go into chip production itself.
Baby Bust: UK Births Hit Lowest Level Since 1977
England and Wales recorded about 585,000 live births in 2025 – the lowest level since 1977.
That’s more than 100,000 fewer babies than a decade ago. As a result, the UK fertility rate has fallen below the replacement level needed to sustain population growth.
Investors tend to think of government borrowing costs in terms of monetary policy and fiscal discipline.
But demographics can also be a powerful driver – and this week’s data shows why.
Fewer workers, bigger bills
A shrinking working-age population has direct consequences for the UK’s fiscal outlook:
The fertility rate in England and Wales fell to a record low of 1.39 last year, converging with an EU average of 1.34. That’s well below the replacement fertility level of 2.1.
Fewer future workers means direct pressure on tax revenues, pension funding, and NHS capacity. School closures are already underway in some parts of the country.
The data also showed that the share of births to mothers born outside the UK rose to 34.6% in 2025, highlighting demographic dependence on immigration.
The UK’s fiscal model assumes a working-age population large enough to fund the services an ageing one requires.
That assumption is now eroding in real time, and the policy solutions (higher immigration, higher taxes, or lower spending) all carry political costs.
Sidekick Takeaway: Gilt analysts typically focus on inflation prints and growth forecasts, but the demographic picture also matters over longer horizons. A structurally smaller workforce means weaker tax receipts and higher welfare spending – a combination that puts sustained upward pressure on government borrowing costs.
Between the Lines: ECB Warns of Deeper Shifts Behind Trump-Era Risks
On the surface, the ECB’s latest financial stability review warns about Donald Trump.
In the report, the ECB argues that the Iran war, tariff volatility, and Washington’s retreat from multilateral cooperation risk triggering a financial crisis.
But read more carefully, the review describes a fundamental shift in the global financial system.
Beyond Trump, the ECB outlines a world where geopolitical shocks are more frequent, policy is less predictable, and the system’s shock absorbers are weaker.
The result: a world that’s structurally more vulnerable to crisis.
New risks, old plumbing
The structural shifts the ECB identifies go well beyond the current US administration:
- The review describes tariff announcements, pauses, and reversals as a ‘structural feature’ of the global environment – a persistent source of uncertainty, not one-off disruptions.
- The ECB also sees hedge funds and other price-sensitive investors playing a growing role in sovereign bond markets. Their presence may contribute to rapid repricing of government debt.
- Moreover, lending is migrating from regulated banks into certain corners of private credit. That means more borrowers (and more risk) sit outside traditional oversight.
Altogether, the ECB paints a picture of a financial system dealing with more shocks, faster transmission, and less transparency.
While Trump may be contributing to systemic risks, the system itself has become more fragile.
Sidekick Takeaway: The global financial system was largely built for a rules-based international order, a world that arguably no longer exists today. The question is whether regulators are moving quickly enough to shore up the system’s resilience before the next crisis hits.
Notices
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