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Top Gainers: The Best-Performing North American Stocks and What Drove Them

Top Gainers: The Best-Performing North American Stocks and What Drove Them

ATN BREAKING NEWS |

Top Gainers: The Best-Performing North American Stocks and What Drove Them

October 28, 2026 | ATN Trade & Finance

The 2026 US equity market has split into two distinct tiers: an AI infrastructure trade that has driven a handful of stocks to gains that would be extraordinary in any other year, and a broader market that has struggled with elevated rates, sticky inflation, and slowing consumer demand. Understanding which stocks are winning, and specifically why, is useful not just as market commentary but as a map of where capital is flowing and where operational demand is being concentrated — which is directly relevant to supply chains, procurement, and trade finance.

The Year-to-Date Leaderboard: AI Storage Dominates

The single best-performing S&P 500 stock of 2026 is SanDisk (SNDK), with a year-to-date gain approaching 500-530% through late September and continuing higher into October. SanDisk — which spun out of Western Digital in early 2025 — is a pure-play on enterprise flash storage for AI data centers. The core dynamic: AI model training and inference require not just GPUs and high-bandwidth memory but enormous quantities of high-speed storage to handle the data lakes those models consume. Hyperscalers building out AI infrastructure have been ordering at a pace that has sold out SanDisk's production capacity and driven NAND pricing to record levels. The company reported fiscal fourth-quarter revenue of approximately $8.97 billion, up 372% year over year, with roughly two-thirds of that sequential growth coming from higher pricing rather than volume — a margin profile that has been dramatically stronger than most technology companies achieve in a single product cycle. Market capitalization has crossed $200 billion, an extraordinary achievement for a company that was a division of Western Digital less than two years ago.

Second on the S&P 500's year-to-date list is Moderna (MRNA), up more than 587% as of mid-October and the clearest illustration that 2026's stock market is not entirely an AI story. Moderna's gain traces to a single major catalyst: in August, Moderna and Merck published Phase 3 results from their personalized mRNA cancer vaccine trial in melanoma patients, showing a statistically significant reduction in cancer recurrence. The stock more than doubled in a single session on that data. Additional momentum came in September from reports that the National Institutes of Health is preparing a public-private initiative to accelerate cancer vaccine development, and from Moderna's addition to the Nasdaq-100 index — which created forced buying from index-tracking funds. The full melanoma trial data is expected to be released later in the fall, with regulatory approval filing anticipated in 2027. Moderna still carries large operating losses — roughly $800 million in net losses for Q2 2026 on a GAAP basis — so the stock's move is a bet on future revenue from an oncology pipeline, not current profitability.

Dell Technologies (DELL) rounds out the top three, up more than 300% year-to-date through September. The thesis is straightforward: Dell has positioned itself as a primary AI server integrator for enterprise customers who are not buying direct from cloud hyperscalers. The company has booked more than $130 billion in AI server orders in the past 12 months and raised its annual revenue forecast to approximately $192 billion. Dell's gain is also notable because it comes from a traditional technology hardware company, not a semiconductor pure-play, demonstrating that the AI capital spending cycle is broad enough to lift the full server infrastructure supply chain.

Micron Technology (MU, +224% YTD through September) and Seagate Technology (STX, +183% YTD through September) round out the top five. Micron's gain is driven by high-bandwidth memory (HBM) chips, which AI processors require for fast data access and which remain in tight supply. Fiscal third-quarter revenue came in at $41.46 billion. Seagate's is driven by AI-generated data creation and cloud data center demand for mass-capacity hard drives — a less glamorous but equally essential part of the AI infrastructure stack. Seagate's fiscal 2026 revenue rose 34% to approximately $12.2 billion.

October's Standout Movers: A Defense Contract and a Takeover

The top monthly gainer in the broader US market for October is not an AI stock. Ultralife Corporation (ULBI), a small-cap defense electronics manufacturer, surged more than 140% after winning a firm-fixed price, indefinite-delivery/indefinite-quantity contract from the US Army for Conformal Wearable Batteries — a specialized power technology used by soldiers in the field. The contract carries a potential value of up to $520 million: approximately $168 million over a three-year base period and up to an additional $350 million across six one-year option periods. For a company Ultralife's size, a contract that could total more than $520 million represents a transformative revenue opportunity. The stock rose approximately 35% in after-hours trading on the initial announcement and continued climbing through the month as investors priced in the scope of the contract's option periods.

Bumble (BMBL) surged approximately 127% in October — not because of improving fundamentals, but because it agreed to be acquired. On October 12, The Wall Street Journal reported that Bumble was in advanced talks with Ithaca Holdings, a technology holding company founded by Ravi Gupta and John Hegeman. Bumble confirmed the deal the following day: Ithaca is acquiring the company for $6.05 per share in cash, valuing it at approximately $1.3 billion — a 138% premium over Bumble's October 9 closing price of $2.54. Bumble's revenue fell from $1.072 billion in 2024 to $965.7 million in 2025, and continued declining in 2026 (down 15.2% year over year in the second quarter), with average paying users also shrinking. The deal represents a private-equity-style takeout of a cash-generating but shrinking consumer platform; Bumble generated approximately $124.9 million in free cash flow in the first half of 2026 despite its revenue headwinds. The stock trades near the $6.05 offer price; the remaining spread of roughly $0.10 per share compensates investors for deal execution risk.

This Week's Gainers: The Alphabet Effect on Semiconductors

The single most significant stock move of the week came from an indirect beneficiary of Alphabet's earnings. SK Hynix's US-listed ADR (SKHY) surged more than 13% on October 28 after Alphabet disclosed that its 2026 capital spending plan had been raised to $195 to 205 billion, up from the prior $180 to 190 billion range. SK Hynix is the world's dominant supplier of HBM chips — the specialized memory that powers AI accelerators, including those used in Google's data centers. A $15-25 billion upward revision to Alphabet's annual capex is a direct demand signal for the components those data centers require. AMD rose approximately 5.5% in the same session for the same reason, as did Broadcom at 4.0% — both companies sell silicon that goes into AI infrastructure buildouts.

Microsoft provided its own week-ending gain, rising approximately 3.5% in after-hours trading on Tuesday after reporting fiscal first-quarter 2027 revenue of $92.28 billion (up 18.8% year over year, beating consensus by roughly 1.8%) and Azure cloud growth of 48% — well above expectations. SoFi Technologies (SOFI) was the most dramatic gainer among earnings-reporting companies during the week's regular sessions, rising approximately 11% after beating on both revenue ($1.39 billion versus $1.26 billion consensus) and earnings ($0.18 adjusted EPS versus $0.17 estimate), raising full-year 2026 guidance, and issuing 2027 EPS guidance of $0.90 against a Street estimate of $0.82.

What this means: The breadth and scale of the AI infrastructure trade is the defining feature of 2026 North American equity performance. It is not, as some earlier commentary suggested, narrowly concentrated in a handful of GPU makers; it has spread to storage (SanDisk), server integrators (Dell), HBM suppliers (Micron, SK Hynix), networking silicon (Broadcom), and cloud platforms (Microsoft, Alphabet's Cloud segment). The secondary theme is defense and government-contract spending, where Ultralife's Army battery contract illustrates that elevated defense budgets are reaching the deep supply chain, not just the prime contractors. And Moderna's cancer vaccine story is a reminder that pharmaceutical breakthroughs can produce stock moves that rival the AI infrastructure trade in absolute percentage terms, even if the total capital involved is smaller. For supply chain professionals, the practical implication of the SanDisk, Micron, and Seagate gains is that AI data center build-out is consuming storage and memory capacity at a pace that is structurally tightening those supply chains — the same pricing dynamics driving stock gains are also affecting what enterprises pay for components and what lead times look like through 2027.

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