The market narrative is loud. Your controls need to be louder.
Megacap tech now drives much of the index return. By early 2025, the top 10 S&P 500 companies made up nearly 40% of the index-matching or even exceeding the dot-com era [1].
Meanwhile, the July U.S. jobs report added just 73k payrolls. More importantly, it cut 258k jobs off the May-June total via revisions. That was enough to change both the rate-cut debate and the discount rate in portfolio models [2].
At the same time, AI has turned data-centre build-outs into one of the fastest-growing power loads in the world. In 2024, these sites used around 415 TWh of electricity, and demand is still rising fast [3]. Hyperscale facilities often need 100 MW+ connections. Therefore, power-not GPUs-is becoming the real limit [4]. Multiple forecasts now expect a doubling of global data-centre power demand by 2030 [5].
Trade policy is adding extra strain. In 2024, the U.S. expanded Section 301 tariffs to cover semiconductors, batteries, and more [6]. Then, in August 2025, Washington broadened these measures across several partners. As a result, tech supply chains face higher costs and more uncertainty [7].
The capex wave is real-and lumpy
- Alphabet lifted 2025 capex guidance to ~$85bn, citing servers and new data centres [8].
- Meta projected $66-72bn in 2025, including finance leases for AI infrastructure [9].
- Microsoft is keeping to its ~$80bn AI-focused plan, although the pace will slow [10].
- Amazon has a ~$100bn capex target, mostly for AWS and custom chips [11].
Capex this large becomes a macro force. It shapes utility demand, industrial output, semiconductor orders, and even land use for data centres. It also creates single-name risk. If one hyperscaler delays spending, the effect can ripple through several supply chains at once.
Why “pattern matching” still meets physics – and P&L
Large language models are powerful pattern matchers. However, they scale only until they hit limits in data, compute, and energy.
This is not just theory. In 2021, Bender and colleagues warned about the declining returns from ever-larger models [13]. In contrast, the 2020 “scaling laws” convinced many that bigger always meant better [14]. Now, even leaders like Yann LeCun say new architectures will be needed for the next leap forward [13].
For investors, the lesson is clear: do not price perpetual high returns only on model size. Instead, demand proof of unit economics, a data advantage, and stable access to power.
A practical playbook for CIOs and PMs
1) Position sizing for concentration risk
Set clear limits on megacap exposure within your mandate.
Scenario test a 20-30% drop in AI leaders if capex slows or power delays appear.
Include tariff shocks in these tests to model higher import costs.
Balance exposure by combining cap-weighted holdings with equal-weight or mid-cap names [1].
2) Make power a diligence item-not an ESG box-tick
Ask partners for interconnect dates, power purchase terms, and backup plans.
Model project delays based on grid access, cooling needs, and water supply [3][4][5].
3) Translate tariff risk into real numbers
Map your costs to tariff lines.
Quantify landed-cost changes and how much you can pass to customers.
Plan re-sourcing timelines before policy changes hit [6][7].
4) Watch for capex discipline signals
Track: revenue per capex dollar, accelerator use, cash conversion, and AI monetisation speed.
Listen to guidance language-Alphabet’s $10bn increase, Meta’s $66-72bn range, Microsoft’s slowing pace, Amazon’s ~$100bn plan all carry signals [8][9][10][11].
5) Keep a contracyclical asset sleeve
Central banks stayed net gold buyers in Q2 2025 despite a slower pace [12].
Size allocations according to your liquidity needs and mandate.
Signals that matter
- Grid updates: approvals or deferrals near data-centre sites [3][5].
- Tariff calendars: USTR notices and partner responses [6][7].
- Capex cadence: quarterly raises or cuts in spend plans [8][9][10][11].
- Labour data: payrolls and revisions like July’s +73k/−258k [2].
Bottom line for 2H25
AI capex is a powerful tide. However, energy limits and trade policy form the shoreline that will define its reach.
Therefore, reward firms that convert spending into cash returns-not just model launches. In addition, diversify away from any single narrative by blending exposure across market caps and regions.
Volity
Volity gives investors the tools to act on this playbook with institutional-grade execution and access to global markets-where any volume finds agility. The platform offers professional and reliable trading with effortless, affordable, and transparent access across asset classes.
References
[1] By early 2025, the top 10 S&P 500 companies made up nearly 40% of the index.
[2] BLS: July 2025 payrolls +73k; May-June net revisions −258k.
[3] IEA estimate: data-centre electricity ≈ 415 TWh in 2024.
[4] IEA: large hyperscale DCs often require 100 MW+ connections.
[5] IEA: global DC demand could double by 2030.
[6] USTR: 2024 expansions to EVs, batteries, semiconductors.
[7] 1 Aug 2025: U.S. tariff actions widened to more partners.
[8] Alphabet Q2 2025: capex guidance ≈ $85bn.
[9] Meta Q2 2025: $66-72bn capex (incl. finance leases).
[10] Microsoft FY25: ~ $80bn AI capex, slower growth.
[11] Amazon 2025: ~$100bn capex.
[12] WGC: central banks net gold buyers, Q2 2025.
[13] Bender et al. (2021): “Stochastic Parrots” critique.
[14] Kaplan et al. (2020): Scaling laws for neural models.
