The market’s most explosive first-half winners of 2026 are getting hammered in the second half, and the reversal has been swift and severe.
According to new data from Bespoke Investment Group, the 25 best-performing Russell 1000 stocks in the first half of 2026 — each up at least 150%, for an average gain of 235% — have collectively lost a quarter of their value in fewer than three weeks since July began.
- SNDK stock is moving. See the chart and price action here.
A Brutal Reversal Takes Hold
Every single one of those 25 stocks has fallen at least 8% this month, even as the rest of the Russell 1000 gained an average of 0.8% over the same stretch.
It’s a textbook case of mean reversion, and the AI infrastructure trade that fueled the first-half rally is now bearing the brunt of the pullback.
Leading the retreat is SanDisk (NASDAQ:SNDK), the single best-performing stock in the first half after surging as much as 858% on explosive demand for AI-driven memory and storage. That momentum has evaporated in July, with shares down 37% as of Monday’s close.
Intel Corp. (NASDAQ:INTC), which rode a 257% first-half rally tied to renewed optimism around its chipmaking turnaround and a high-profile White House meeting between CEO Lip-Bu Tan and President Donald Trump, has dropped 28% this month.
They are not alone. Other AI-infrastructure darlings that topped the first-half leaderboard include:
- Micron Technology (NASDAQ:MU) – up 301% in H1, down 22.8% in July
- Western Digital (NASDAQ:WDC) – up 278% in H1, down 21.4% in July
- Seagate Technology Holdings (NASDAQ:STX) – up 252% in H1, down 10.98% in July
- Dell Technologies (NYSE:DELL) – up 229% in H1, down 8.2% in July
- Marvell (NASDAQ:MRVL) – up 227% in H1, down 34.3% in July
- Corning (NYSE:GLW) – up 181% in H1, down 37.7% in July
- Applied Materials (NASDAQ:AMAT) – up 170% in H1, down 24% in July
- Bloom Energy (NYSE:BE) – up 248.4% in H1, down 31.1% in July
Chips, memory, storage and servers dominated the list, reflecting just how concentrated the AI trade had become by mid-year.
Bespoke’s Data Shows a Near-Perfect Inversion
Bespoke’s broader breakdown shows the pain isn’t limited to the top 25. The 47 Russell 1,000 stocks that gained 100%+ in the first half are down an average of 21.6% in July, while the 17 stocks that had fallen 50%+ in the first half have bounced 10.6% — a near-perfect inversion.
Slicing the index into deciles by first-half performance confirms the pattern: the top decile is down 13.2% month-to-date, and returns improve steadily as you move down the ranks.
For traders who chased 2026’s biggest winners into July, the unwind has been swift, and stocks like SanDisk and Intel are now Exhibit A.
Photo: Ruslan Lytvyn / Shutterstock
