US markets have spent 2026 setting records at a pace that's easy to skim past in a headline and hard to actually parse. The S&P 500 is up 9.6% through the first half of the year, the Nasdaq 12.8%, and — the more surprising number — the small-cap Russell 2000 surged nearly 22%, its best first-half performance since 1991. The Dow Jones Industrial Average crossed 53,000 for the first time in early July, and Apple hit a fresh all-time high on July 15. None of that means the ride has been smooth: mid-July saw a sharp rotation out of semiconductor stocks and into other Big Tech names, a reminder that "the market is up" and "every part of the market is up together" are different claims.
The short version: S&P 500 +9.6% and Nasdaq +12.8% through H1 2026; Russell 2000 +22%, its best first half since 1991. Dow crossed 53,000 for the first time in early July. Nvidia briefly hit a record ~$5.3 trillion valuation in April 2026, the highest market cap any public company has reached, and is now essentially tied with Apple for the world's-most-valuable-company title after underperforming the broader market since that peak. Mid-July saw investors rotate out of semiconductor names — up over 80% in H1 — and into Amazon, Alphabet, and Microsoft instead.
The rally is broader than "AI stocks are up"
The single most telling number from the first half of 2026 isn't a tech-index headline — it's the Russell 2000's near-22% gain, its best first half since 1991 and well ahead of the S&P 500's 9.6%. Small-cap strength alongside large-cap tech records suggests the rally has genuine breadth, not just a handful of mega-cap AI names carrying the index. That said, AI infrastructure — chips, data centers, power, and cooling — remains the dominant narrative investors are trading around, so sentiment about that theme still sets the tone even in weeks where the actual gains show up in unrelated sectors.
The mid-July semiconductor rotation, explained
Semiconductor stocks surged more than 80% in the first half of 2026 — an extraordinary run by any measure — and mid-July brought a sharp reversal as investors took profits and rotated into Amazon, Alphabet, and Microsoft instead, each moving up around 3% in the process. This is a rotation within the AI theme, not a rejection of it: capital moved from the chip-makers to companies seen as benefiting from AI adoption more broadly, which is a normal pattern after a run that steep, not necessarily a signal the underlying trend has turned.
Nvidia: from record valuation to a two-way race
Nvidia's 2026 has been a study in how fast "obviously the most valuable company" can become "arguably." The chipmaker hit a record near-$5.3 trillion valuation on April 27, 2026 — the highest market capitalization any publicly traded company has ever reached, comfortably ahead of Google (~$4.2 trillion) and Apple (~$3.9 trillion) at the time. By mid-July, though, Nvidia's market cap had settled to about $4.92 trillion, and Apple — buoyed by its own July 15 all-time high — has been vying with Nvidia for the top spot. Part of the story is a genuine long-term risk to watch: custom AI silicon, built in-house by major cloud players rather than bought from Nvidia, represented 20.9% of the AI chip market in 2025 and is projected to reach 27.8% in 2026 — a real, growing alternative to Nvidia's chips, not just a headline risk.
| Metric | 2026 figure |
|---|---|
| S&P 500 (H1 2026) | +9.6% |
| Nasdaq (H1 2026) | +12.8% |
| Russell 2000 (H1 2026) | +22% (best H1 since 1991) |
| Dow Jones | Crossed 53,000 for the first time (July) |
| Nvidia peak market cap | ~$5.3 trillion (Apr 27, 2026) |
| Nvidia market cap (mid-July) | ~$4.92 trillion |
What this means if you're investing through it
- Broad index exposure captured more of 2026's gains than a narrow AI bet — the Russell 2000's outperformance is a useful reminder that concentration in one theme can miss where the actual returns show up.
- Sharp single-stock or single-sector swings (like the July semiconductor rotation) are a normal feature of a strong run, not automatically evidence the trend has reversed — context (how much a sector had already gained) matters more than the size of any one week's move.
- "Most valuable company" is a moving target in 2026 — Nvidia and Apple have traded the lead, which is worth knowing before treating any single snapshot as a permanent ranking.