Equity markets have extended their advance into June, with US benchmarks holding near record levels even as leadership has narrowed further. The S&P 500 is up around 11% YTD, the Nasdaq Composite roughly 16%, and the Dow Jones Industrial Average around 7%, leaving the dispersion across indices broadly unchanged from end‑May. The concentration story has only intensified: Nvidia now carries the single largest individual weight in the S&P 500 on record at close to 8%, a level that exceeds the entire weighting of several GICS sectors. As shown in Graph 1, the gap between the technology‑heavy Nasdaq and the broader Dow continues to underscore how dependent index‑level gains remain on a small cohort of mega‑cap, AI‑linked names.
The defining event of the period was the long‑anticipated SpaceX IPO. The shares priced at $135, raising around $75 billion in what is the largest IPO in history, and the company debuted on the Nasdaq on 12 June. The stock then rose roughly 20% in its first full session, lifting the implied market capitalisation above $2 trillion. The reception is notable not only for its scale but for its structure: an unusually large retail allocation, and the simultaneous launch of a tokenised version of the stock on a blockchain platform, point to growing convergence between public equity and digital‑asset markets. For investors, the more durable significance is that the listing converts a privately‑held AI and space asset into a public benchmark, against which the next wave of listings will be priced.

​Equity markets have continued to grind higher through the second quarter, with all three major US benchmarks closing at record levels at the end of May despite an unresolved geopolitical backdrop and a meaningful repricing of interest rate expectations. The S&P 500 finished the month at a new high, up around 11% YTD, while the Nasdaq Composite has gained roughly 16% and the Dow Jones Industrial Average around 7%. The dispersion across these indices is itself instructive. The market’s leadership remains heavily concentrated in large-cap technology, where enthusiasm around artificial intelligence and a resilient earnings season have offset the drag from higher energy costs and a more cautious rates outlook. As shown in Figure 1, the gap between the technology-heavy Nasdaq and the broader Dow underscores how narrow the rally has been, with a small cohort of mega-cap names accounting for a disproportionate share of index-level gains. It is worth mentioning a notable statistic at this juncture. Nvidia now has the biggest individual weight in S&P 500 ever, at 8%.