These are the top stock movers for the past week through June 26, 2026, broken down by market-cap tier. CHPT -33.0% was the single biggest move across all four tiers. For each tier, the top 3 gainers and top 3 decliners are listed with a plain-English catalyst note and a pattern-recognition read — whether the move looks like a clean breakout, momentum continuation, mean-reversion bounce, or extended run with reset risk.

Universe: ~145 curated US common stocks (NYSE + Nasdaq, ≥$300M market cap, ≥$1M average daily dollar volume). Cap tier reflects current market cap, not historical.

Mega-cap leaders (above $200B market cap)

Top gainers — past week

1. ↑ ABBV +17.03%

$253.35 · avg $4,307M/day · Mega-cap

Why: AbbVie hit new highs alongside Lilly and J&J as money rotated hard into large-cap pharma. The move looks like a defensive bid: traders parked cash in steady-cash-flow drug names while AI and semiconductor leaders sold off. No single company catalyst — this is sector rotation showing up on the tape.

Pattern: Clean breakout to new highs on rising volume — classic base-and-breakout after months of sideways chop. The week’s gain is sharp for a mega-cap pharma name, so a short-term cooling pause would be normal, but the trend structure looks healthy.

2. ↑ MRK +12.99%

$128.66 · avg $1,574M/day · Mega-cap

Why: Merck rode the same pharma rotation that lifted AbbVie and J&J — no specific catalyst, just steady buying as investors rebalanced away from stretched tech into cheaper healthcare names. Headlines flagged mixed valuation signals but the tape voted with its feet, marking one of Merck’s strongest weeks of the year.

Pattern: Mean-reversion bounce off a long downtrend rather than a fresh breakout. Merck had been a laggard for months, so this week’s pop is more about closing the underperformance gap than starting a new uptrend. Watch how it behaves at prior resistance.

3. ↑ JNJ +11.50%

$254.66 · avg $2,674M/day · Mega-cap

Why: J&J unveiled IMAAVY data that could expand its use in early generalised myasthenia gravis treatment — a real clinical catalyst layered on top of the broader healthcare rotation. The new-high print confirmed buyers were treating the data as a meaningful pipeline expansion, not just incremental news.

Pattern: Breakout to fresh highs on catalyst — the cleanest setup of the three pharma leaders this week. Move is extended short-term but the base behind it was long and tight, which usually means follow-through rather than immediate exhaustion.

Top decliners — past week

1. ↓ ORCL -19.40%

$148.53 · avg $5,046M/day · Mega-cap

Why: Oracle cratered on a report that key partner OpenAI may delay its IPO. Traders had been pricing Oracle as a backdoor OpenAI play given the multi-billion dollar Stargate compute deal, so any delay in OpenAI’s public listing pulls forward valuation risk on Oracle’s AI cloud bookings.

Pattern: Sharp distribution top after a long uptrend — the kind of single-week drop that snaps a momentum trade. Likely needs weeks of basing before a clean re-entry. Reset potential exists but only once volatility cools.

2. ↓ AVGO -11.12%

$365.02 · avg $11,135M/day · Mega-cap

Why: Broadcom got caught in a broad semiconductor selloff driven by memory cost worries — Sandisk’s tumble was the visible tell. Investors started questioning whether AI capex margins hold up if memory pricing pressures compress the rest of the chip stack. No company-specific bad news, just sector-wide derisking.

Pattern: Sharp pullback from an extended uptrend — the chart looks like profit-taking inside a still-intact trend rather than a top. The 11% drop in a week is steep but volume suggests rotation, not panic. Watch the 50-day for buyers.

3. ↓ NVDA -8.62%

$192.53 · avg $29,975M/day · Mega-cap

Why: Nvidia sold off with the broader semi complex on memory cost worries and growing chatter about AI compute being financialised as an asset class — which raises questions about future capex digestion. No bad earnings or guidance, just the highest-multiple AI leader giving back some of its run as the cohort cooled.

Pattern: Garden-variety pullback inside a strong uptrend — extended momentum names typically take 8-12% breathers without breaking structure. This looks like one of those. Not yet showing distribution; reset potential modest unless it loses the prior breakout level.

Large-cap leaders ($10B to $200B market cap)

Top gainers — past week

1. ↑ IBM +9.04%

$271.63 · avg $2,705M/day · Large-cap

Why: IBM benefited from the rotation out of high-multiple AI darlings into reasonably-priced enterprise software with real AI revenue. No big company news this week — the move reads as money finding a safer perch in a value-flavoured tech name while Oracle and the chip leaders unwound.

Pattern: Clean continuation move within an established uptrend — IBM has been quietly compounding for months. The structure looks like a tight flag breaking out, not an exhaustion spike. Trend follow-through more likely than reversal.

2. ↑ DDOG +7.52%

$239.77 · avg $1,017M/day · Large-cap

Why: Datadog caught a bid as analysts highlighted strong fundamentals and cash position in a week when investors went hunting for SaaS names with proven AI monetisation. No specific catalyst — the move reads as part of the rotation from extended semis into mid-tier enterprise software that hadn’t yet rerun.

Pattern: Mean-reversion bounce off a multi-month base — not yet a confirmed breakout. The move is constructive but Datadog needs a clean break of recent highs on volume to call it more than dip-buying.

3. ↑ SHOP +7.36%

$116.86 · avg $1,273M/day · Large-cap

Why: Shopify gained on chatter around its agentic commerce push — the AI-driven merchant tools angle gave traders a fresh growth story. The ‘buy on dip’ framing in headlines suggests this was technical positioning by funds rotating into reasonably-priced platform names rather than a fundamental upgrade.

Pattern: Bounce off recent support — looks more like dip-buying inside a sideways range than a fresh breakout. Needs to clear overhead before pattern turns from mean-reversion to trending. Move is moderate, not extended.

Top decliners — past week

1. ↓ IREN -21.26%

$47.21 · avg $1,962M/day · Large-cap

Why: IREN cratered as bitcoin tumbled and the entire crypto-mining cohort entered free fall. Crypto miners with AI data-center pivots like IREN trade with a high beta to bitcoin price, so when BTC broke down the leveraged exposure cut both ways. AI capacity story didn’t matter once the underlying token rolled.

Pattern: Sharp trending decline breaking recent support — distribution pattern. Move is extended on the downside but crypto-correlated names rarely bottom until bitcoin stabilises. Reset potential high, but timing depends on the token, not the chart.

2. ↓ QCOM -16.24%

$189.39 · avg $5,477M/day · Large-cap

Why: Qualcomm got hit by the same memory-cost worries that took down Broadcom and the chip complex, plus growing scepticism about its AI data centre pivot delivering near-term revenue. The combination of sector derisking and a still-unproven new growth leg made it a top funding source for the week’s rotation.

Pattern: Sharp breakdown from a multi-month range — looks like distribution rather than a clean pullback. 16% in a week without earnings is severe; chart structure suggests further downside likely before basing begins.

3. ↓ PLTR -12.10%

$112.93 · avg $6,140M/day · Large-cap

Why: Palantir sold off as the highest-multiple AI software name in the cohort, caught in the same rotation that hit Oracle and the chip leaders. Headlines noted late-week dip-buying by big investors, but the week ended down sharply — momentum unwound faster than buyers stepped in.

Pattern: Sharp pullback inside an extended uptrend — Palantir had been one of the year’s biggest gainers, so a double-digit weekly retracement is healthy, not structurally broken. Possible reset potential as ‘most oversold mega-cap tech’ headlines suggested capitulation.

Mid-cap leaders ($2B to $10B market cap)

Top gainers — past week

1. ↑ KSS +11.65%

$19.26 · avg $111M/day · Mid-cap

Why: Kohl’s added veteran operator Elliott Rodgers as COO in a key leadership shift, fuelling renewed turnaround optimism. The stock has been a perennial short-squeeze candidate at depressed levels, so any positive operational news triggers outsized moves on a thin float of believers.

Pattern: Bounce off multi-year lows — looks like short-covering plus turnaround bid rather than a fundamentally-driven trend change. Needs durable execution news to extend; otherwise mean-reversion bounces in deep-value retail fade quickly.

2. ↑ LCID +10.45%

$5.92 · avg $75M/day · Mid-cap

Why: Lucid bounced from near all-time lows, with headlines mixing ‘why it’s up’ positive coverage against ‘capital destruction trap’ warnings. The move reads as a low-priced EV name catching a relief bounce — not a fundamental shift. Balance sheet concerns remain the dominant overhang.

Pattern: Bounce off a deeply oversold all-time-low base — classic mean-reversion in a downtrend rather than a base-and-breakout. Move likely fades unless backed by financing news or production milestones. Low-quality bounce.

3. ↑ GTLB +9.45%

$29.07 · avg $151M/day · Mid-cap

Why: GitLab caught a bid on an AI accountability report and favourable comparisons to bigger software names like Snowflake. The move reflects rotation into reasonably-priced DevOps software with credible AI governance positioning — a niche but real angle as enterprise AI adoption hits the compliance wall.

Pattern: Mid-cap mean-reversion bounce off recent support — constructive but needs higher volume to confirm a base-and-breakout. The structure is improving rather than confirmed; risk is a fade if broader software softens.

Top decliners — past week

1. ↓ AMC -23.67%

$2.16 · avg $147M/day · Mid-cap

Why: AMC raised $200 million to tackle debt and fund corporate plans — dilution headline that crushed an already-fragile equity. Adding shares to a structurally weak balance sheet at low prices is a textbook setup for a sharp drop, and the tape responded accordingly.

Pattern: Sharp breakdown to new lows on dilution catalyst — classic capital-raise distribution. No reset until shares overhang clears. Pattern is trending decline, not bottoming.

2. ↓ PLUG -10.88%

$2.54 · avg $136M/day · Mid-cap

Why: Plug Power slid on broad profit-taking in the fuel-cell and hydrogen cohort — FuelCell down 10%, Bloom down 7% the same week. No specific Plug catalyst; just the speculative clean-energy basket giving back recent gains as risk appetite rotated to safer names.

Pattern: Pullback inside a still-volatile range — Plug trades on cohort momentum more than chart structure. The move is moderate, not yet distribution, but the name remains tied to clean-energy sentiment rather than its own fundamentals.

3. ↓ AKAM -9.30%

$113.29 · avg $526M/day · Mid-cap

Why: Akamai drifted lower on no specific catalyst — the headlines flagged underperformance without a clear company trigger. Most plausibly a continuation of the broader rotation out of legacy edge/CDN names as investors prefer modern security and observability plays like Datadog this week.

Pattern: Continued trending decline within an established downtrend — no sign of basing yet. The structure suggests sellers still in control. Pattern is constructive bearish, not yet at reset levels.

Small-cap leaders ($300M to $2B market cap)

Top gainers — past week

1. ↑ STUB +6.16%

$12.40 · avg $182M/day · Small-cap

Why: StubHub gained on no clear headline catalyst — most plausibly a low-float small-cap consumer name catching residual momentum from prior coverage. With no fresh news, the move is more about supply/demand on a thin tape than any fundamental shift in the live-events thesis.

Pattern: Modest grind higher with no volume signature — looks like sideways accumulation rather than a true breakout. Need a fundamental hook or volume surge to call this a real pattern. Currently neutral.

2. ↑ MARA +2.25%

$14.54 · avg $760M/day · Small-cap

Why: Marathon Digital edged up despite bitcoin’s weekly slide — the modest gain reflects analyst bullishness on miner consolidation and AI compute pivots offsetting some of the BTC weakness. Note that another crypto firm cut staff for an AI push, the cohort’s emerging template for survival in cheaper BTC regimes.

Pattern: Sideways consolidation with a slight upward bias while peers like IREN crashed — relative strength is the notable feature. Not a clean pattern, but the divergence from BTC weakness is worth flagging if it persists.

3. ↑ RIOT +1.67%

$28.57 · avg $468M/day · Small-cap

Why: Riot Platforms eked out a small gain on analyst optimism and broader interest in crypto miners pivoting to AI data centres — same playbook lifting peers despite a weak bitcoin tape. The move is modest but notable for holding green against a falling BTC.

Pattern: Tight consolidation against a weak crypto backdrop — relative strength is the standout. No breakout yet, but staying flat while bitcoin falls is constructive. Pattern is range-bound, watch for BTC stabilisation as the trigger.

Top decliners — past week

1. ↓ CHPT -32.97%

$5.57 · avg $7M/day · Small-cap

Why: ChargePoint cratered with no fresh catalyst beyond reflections on weak Q1 renewable-energy earnings. Sub-$10 EV-infrastructure names trade on speculative flow and any uptick in sector pessimism gets amplified. The 33% drop reads as capitulation on a name with structural cash-burn concerns.

Pattern: Sharp trending decline to new lows — capitulation move, but in a name with deteriorating fundamentals these often extend. Reset potential exists technically but quality of bounce would be poor without a real catalyst.

2. ↓ MVIS -22.25%

$0.28 · avg $4M/day · Small-cap

Why: MicroVision dropped over 22% on no recent headlines — sub-dollar lidar names trade almost purely on flow, dilution risk, and sentiment toward speculative auto-tech. Most plausibly continued retail rotation out of penny-stock tech themes as the broader tape rewarded quality.

Pattern: Trending decline at sub-dollar levels — chart structure barely matters at this scale; the name trades on micro-catalysts and dilution headlines. Pattern is broken, no clean reset signal.

3. ↓ BLDP -17.16%

$3.62 · avg $26M/day · Small-cap

Why: Ballard Power fell with the broader hydrogen and fuel-cell cohort — the same profit-taking that hit Plug Power, FuelCell, and Bloom. No company-specific news; just the speculative clean-energy basket unwinding as risk appetite shifted toward earnings-backed names this week.

Pattern: Continuation of an extended downtrend — no basing signature yet. Move is part of cohort weakness, so the bottom likely arrives only when the full hydrogen complex stabilises. Pattern is trending decline.

What the past week cohort tells us

The week’s leadership tells a clear story: defensive rotation. Mega-cap pharma — ABBV, MRK, JNJ — produced the strongest, highest-quality winners, all hitting new highs together on no shared catalyst beyond money looking for safer cash flow. Meanwhile mega-cap AI and semi leaders (ORCL, AVGO, NVDA, QCOM, PLTR) made up most of the top decliners. That’s a textbook risk-off rotation: investors paid up for predictable earnings and sold extended growth multiples. Large-caps split — IBM and SHOP found bids as reasonably-priced tech alternatives, while crypto-correlated IREN crashed with bitcoin. Mid and small-cap winners were lower-quality bounces (KSS turnaround chatter, LCID near-low rebound) while the cohort’s worst losses concentrated in speculative clean-energy and crypto (CHPT, MVIS, BLDP, AMC). Return dispersion is wide and skewed negative below the large-cap line, which signals risk appetite drying up at the small end. The forward observation: when defensive pharma leads on no catalyst and AI mega-caps fund the rotation, it usually marks the start of a multi-week digestion phase for the AI trade rather than a one-week wobble — watch whether next week’s tape confirms with continued semi weakness or snaps back.

Bottom line

The top stock movers recap covers every US market-cap tier from mega ($200B+) to small ($300M-$2B). The Past Week view shows sustained leadership and sector rotation — complementary to the daily session recap (single-session moves, Tue-Sat morning Melbourne time).