The Stock Market's Wild First Half of 2026: AI Winners, War Jitters, and a Crypto Crash

Six months into 2026, Wall Street has a paradox on its hands: stocks near record highs, a raging Middle East conflict, and a crypto market that's been cut nearly in half. Here's how it all played out.

S&P500 index heat map for 2026

The Big Picture: S&P 500 and Nasdaq 100

Despite a genuinely turbulent geopolitical backdrop, U.S. equities had a strong first half. The S&P 500 rose 9.5% to 9.8% in H1 2026 depending on the exact measurement date (price return), with total-return figures running a bit higher near 10.1%. The index crossed 7,600 for the first time during the period, and by early July it was trading around the 7,500 level.

The Nasdaq 100 did even better, up roughly 19% for the half (on a total-return/QQQ basis), powered almost entirely by the AI infrastructure trade , memory chips, semiconductors, and data-center hardware. Notably, one analysis found that almost all of the Nasdaq-100's H1 gains came from just 10 stocks, underscoring how narrow the rally was at the very top, even as breadth improved elsewhere in the market (62% of S&P 500 constituents were in positive territory for the year).

The Dow Jones Industrial Average lagged both, up roughly 6-7% YTD, crossing 50,000 for the first time in February before a 10% correction tied to the Iran conflict, then recovering to a fresh record close near 51,032 by late May.

It wasn't a straight line, though. The second quarter saw a sharp pullback: since June 5 alone, the S&P 500 fell about 2.7% and the Nasdaq 100 dropped more than 3.78%, as some of the year's biggest AI winners took a breather and money rotated toward more defensive corners of the market ,Consumer Staples, Real Estate, and Healthcare all outperformed during that stretch.

Best-Performing S&P 500 Stocks: The AI Hardware Sweep

The list of H1 2026's biggest winners reads like a semiconductor and data-storage roll call. AI infrastructure spending , chips, memory, servers , was the dominant theme, and companies feeding that buildout saw explosive gains:

Company	H1 2026 Gain (Approx.)
SanDisk (SNDK)	+858%
Micron Technology (MU)	+304%
Intel (INTC)	+278%
Western Digital (WDC)	+271%
Marvell Technology (MRVL)	+251%
Seagate Technology (STX)	+250%
Dell Technologies (DELL)	+243%
Corning (GLW)	+192%
Applied Materials (AMAT)	+181%
Advanced Micro Devices (AMD)	+171%

SanDisk was, by a wide margin, the standout , its stock rose nearly 9x on surging demand for NAND flash memory and enterprise SSDs used in AI data centers, with analysts noting the company's earnings estimates actually grew faster than its share price (its forward P/E fell even as the stock soared 858%). Memory and storage names (SanDisk, Micron, Western Digital, Seagate) dominated the top of the list as a global memory-chip shortage sent prices , and profits, sharply higher. Of the 20 best-performing S&P 500 stocks in H1, all but three were technology names; the exceptions were Moderna, Generac, and Comfort Systems USA.

Worst-Performing S&P 500 Stocks: The "AI Will Replace Us" Trade

On the flip side, software and services companies where investors fear AI could erode the business model got hammered , even when their actual financial results were solid. The poster child was Intuit (INTU), maker of TurboTax and QuickBooks, which fell roughly 58-61% in H1 despite revenue growing 10% year-over-year. The stock's collapse was driven almost entirely by investor anxiety that generative AI tools could substitute for tax-prep and accounting software , its forward P/E dropped from 26.8 to under 10, less than half the S&P 500's multiple.

Other notable decliners on the "AI disruption fear" list included major software and consulting names such as Adobe and Salesforce, alongside consumer names like Lululemon, which saw one of the steepest earnings-estimate cuts in the index after a 31% drop in quarterly EPS. The common thread across nearly all of the year's 20 worst S&P 500 performers: businesses that sell software, services, or expertise that traders worry an AI agent could eventually replace.

What Moved Markets: Geopolitics Took the Wheel

Three geopolitical and macro forces defined H1 2026's volatility:

1. The U.S.–Israel–Iran conflict. This was the single biggest story of the half. Following a joint U.S.–Israeli military operation against Iran that began in late February, oil markets went haywire , Brent crude spiked above $113 per barrel at various points in March, April, and May as traffic through the Strait of Hormuz (which normally carries roughly 20% of global oil flows) collapsed to a fraction of pre-conflict levels. The S&P 500 fell about 9% below its January peak at the depths of the scare, and the Dow and Nasdaq briefly approached correction territory (a 10%+ decline). A tenuous ceasefire announced on April 7 helped markets stabilize, though tensions flared intermittently afterward. Remarkably, U.S. stocks kept grinding to new records even as the war continued , a reminder that markets tend to price in where the world will be in 6-12 months, not the headlines of today.

2. Tariffs and trade policy. Lingering effects from the prior year's tariff escalation ("Liberation Day" tariffs and their aftermath) continued to feed into input costs and inflation expectations, adding a second layer of uncertainty on top of the war.

3. The Federal Reserve and inflation. A change in Fed leadership, sticky inflation readings (April CPI near 3.8%, May CPI at 4.2% year-over-year), and uncertainty about the rate-cut path kept bond yields elevated and periodically spooked risk assets , this was a major factor behind the early-June pullback in both stocks and crypto.

Energy was the direct market beneficiary of the Iran conflict, finishing as one of the S&P 500's top three sectors for the half on the back of supply-disruption fears, even as it created headwinds for energy-importing regions like Europe and Asia.

Crypto Corner: Bitcoin and Ethereum's Brutal Half

If equities had a good six months, crypto had almost the opposite experience , this was one of the worst first halves for digital assets in years.

Bitcoin (BTC) closed 2025 at about $87,500, itself already down roughly 30% from its October 2025 all-time high of $126,198. From there, it kept sliding through H1 2026, touching lows near $60,000-$61,500 in February and again in early June. As of early July 2026, BTC was trading around $61,500-$62,000, putting it down roughly 29-30% year-to-date , and nearly 50% below its October 2025 peak. Analysts point to a convergence of factors behind the slide: a hawkish Fed holding rates higher for longer, U.S.-Iran geopolitical tension pushing investors toward safety, a record 13-day streak of Bitcoin ETF outflows totaling roughly $4.4 billion, and a sentiment shock after Strategy (formerly MicroStrategy) disclosed its first BTC sale in years. U.S. spot Bitcoin ETFs alone saw about $4.5 billion in net outflows in June, their worst month since the ETFs launched in January 2024.

Ethereum (ETH) fared even worse in percentage terms. It closed 2025 near $2,970-$3,024 and spent H1 2026 grinding lower, falling toward the mid-$1,500s at its worst points before recovering modestly to around $1,650-$1,715 by early July. That's a decline of roughly 43-45% year-to-date , a much steeper drop than Bitcoin's, extending Ethereum's long stretch of underperformance relative to BTC. The total crypto market capitalization is estimated to be down roughly $2 trillion from its highs, with Solana among the other major tokens down more than 70% from its peak.

The silver lining for crypto bulls: several on-chain indicators (Fear & Greed Index near historic lows, MVRV Z-Score around 0.4) sit at levels that have historically marked cycle bottoms in the past , though as analysts are quick to caution, those same signals have flashed before prices fell further in prior bear markets, so there's no guarantee the bottom is in.

The Bottom Line

H1 2026 was a market of extremes hiding under a calm-looking headline number. The S&P 500's ~9.5% gain and the Nasdaq 100's ~19% surge mask a market that fell nearly 10% and rebounded within the same six months, powered almost entirely by a handful of AI infrastructure stocks while software names seen as AI's victims got crushed. Meanwhile, crypto , often pitched as a hedge against exactly the kind of macro and geopolitical uncertainty that defined the half , instead became one of its biggest casualties, with Bitcoin and Ethereum both posting double-digit percentage losses even as equities notched fresh records.

Note: Price and percentage figures reflect data available as of early July 2026 and are approximate given ongoing market volatility. Some of the numbers or percentage might be not exact. This article is for informational purposes only and is not investment advice.