Top Stock Losers Today — July 16, 2026 —>> Thursday delivered a session that looked healthy on the surface — solid bank earnings, a UnitedHealth Group surge, even a decent ManpowerGroup beat. But beneath the waterline, the Nasdaq was getting gutted. A tsunami that started with Taiwan Semiconductor’s spending guidance hike swept through every name connected to AI infrastructure — and when it was over, the Nasdaq had shed 1.47% and the S&P 500 fell 0.51% to 7,533.77.

The Dow held better (-0.20%, 52,552.97), propped up by defensive rotation. But the day’s losers list was deep, varied, and told a story about where the market’s fault lines are right now.

Thursday’s Market Close at a Glance

The VIX jumping 6% to 16.73 is the number that matters most. It signals that options traders are pricing in meaningfully more volatility in the near term — consistent with a market that’s processing the intersection of semiconductor sector doubt, geopolitical Iran war escalation risk, and rate concerns from a still-elevated Treasury yield.

The Root Cause: TSM’s Capex Shock

Almost everything on today’s loser list traces back to one moment: Taiwan Semiconductor Manufacturing Company (TSM) reported Q2 2026 earnings that beat Wall Street on revenue and earnings per share — and then raised its 2026 capital expenditure guidance to $60–$64 billion, up from the prior range of $52–$56 billion.

Investors’ reaction was counterintuitive but rational: spending more on capex can compress margins and raise questions about capacity discipline. The VanEck Semiconductor ETF (SMH) slid nearly 4% — and the shockwave rippled into every company in the semiconductor ecosystem.

#1 — WDC (Western Digital Corporation) | Down 7.2% — Thursday’s Largest Percentage Loser

Western Digital was the hardest single-session hit among larger-cap names Thursday, declining 7.2% with no company-specific negative news.

What drove it:

• Pure semiconductor sector contagion from TSM’s capex guidance raise
• Western Digital operates in NAND flash storage and HDDs — both are dependent on the same capital spending cycles that TSM’s announcement called into question
• WDC has been a beneficiary of the AI data center storage demand thesis; Thursday’s selloff reflects a “pause and reassess” moment for the entire AI infrastructure trade

The contrast: Just 24 hours earlier, WDC was considered a direct beneficiary of the same AI spending boom. TSM’s capex raise changes the calculus — if chip manufacturers are spending more than expected, it implies lead times are longer and near-term supply-demand balance is less certain.

Technical damage: A 7.2% single-day decline puts WDC back below key moving averages. Watch for whether institutional buyers step in at a meaningful support zone on Friday, or whether the breakdown accelerates.

#2 — GLW (Corning Incorporated) | Down 6.7% — Two-Day Crash of 14%+

Corning’s session Thursday marked the continuation of one of the most dramatic reversals of any large-cap this month. After surging 14% on June 29 from Russell Growth index inclusion, GLW has now plunged in two consecutive sessions — down 7.81% on Wednesday and 6.7% on Thursday.

The catalyst: An unscheduled mid-quarter update in which management cut full-year guidance, citing:

• Carrier network segment deceleration: Major telecom providers deferring capital expenditures on fiber deployments, directly reducing near-term demand for Corning’s optical communications products
• Display tech inventory buildup: Panel oversupply in the supply chain is suppressing orders for Corning’s glass components
• Solar wafer facility issues: Production bottlenecks at a new facility are adding an unexpected $30 million in Q2 expenses

The valuation concern: Corning had reached what analysts called a “valuation premium” driven by AI fiber enthusiasm — a premium that is now being rapidly unwound. At the recent high, the implied multiple was stretched for a company that still derives significant revenue from display glass (a slower-growth segment).

Key technical levels:

• Analyst average 12-month price target: $204.30 (high: $230)
• Current MACD: -0.522 (bearish signal)
• RSI: 48.12 (neutral but deteriorating)
• Analyst warning: support failure could mean 25%+ further downside from here

#3 — MTG (MGIC Investment Corporation) | Down 5.7% — Rate-Driven Mortgage Insurer Pain

MGIC Investment dropped 5.7% Thursday as the 30-year mortgage rate hit 6.55% — the highest level in approximately one year per Freddie Mac.

The direct connection:

• MGIC provides private mortgage insurance (PMI) — required when homebuyers put less than 20% down
• Higher mortgage rates suppress home purchase volumes, reducing MGIC’s new policy originations
• Credit quality concerns: at 6.55% mortgage rates, more homeowners who bought at peak prices in 2023–2024 face potential stress
• The 10Y Treasury at 4.557% (rising 1.2 bps Thursday) adds upward pressure on mortgage rates

The broader housing picture: June Housing Starts data releases Friday morning at 8:30 AM ET — a weak print would compound Thursday’s MGIC selloff. A surprise recovery would offer some relief.

#4 — COHR (Coherent Corporation) | Down 5% — AI Fiber Caught in the Blast Radius

Coherent, which produces optical components and semiconductor lasers for AI data center connectivity, dropped 5% Thursday — despite having nothing wrong with its business fundamentals.

What happened:

• Coherent is in the same AI fiber/optical infrastructure bucket as Corning — the GLW guidance cut raised doubts about the near-term pace of optical component orders
• TSM’s capex guidance raise added to concern that AI infrastructure builds may have longer lead times than previously assumed
• Coherent was already trading at elevated multiples after a strong 2026 YTD run — any catalyst for de-risking hits harder when starting from an elevated valuation

The distinction: Coherent’s exposure is more semiconductor-linked than Corning’s (which has a legacy display business). As data center fiber demand remains structurally intact, Thursday’s 5% drop looks more like a valuation correction than a fundamental breakdown.

Watch: Coherent earnings later in July will be the real test of whether Thursday’s selloff was warranted.

#5 — ARM (Arm Holdings) | Down More Than 5% — Chip Architecture Giant Hammered

Arm Holdings’ 5%+ decline made it the biggest single-name contributor to the SMH’s -4% session, given its large weighting in the chip ecosystem.

The ARM-specific angle:

• Arm’s business model is licensing intellectual property for chip designs — every AI chip that uses ARM architecture generates royalty income
• The TSM capex revelation raised fears about the cadence of AI chip production: if capacity takes longer than expected to come online, near-term ARM royalty streams could be affected
• Arm had been one of 2026’s strongest performers — Thursday’s drop reflects profit-taking at elevated levels

Technically: ARM had been running above key moving average support. A break below these levels on high volume is a deterioration signal that bulls need to recapture quickly.

#6 — NOW (ServiceNow) | Down 4.7% — AI Software Hit by Rotation

ServiceNow fell 4.7% Thursday in one of the more surprising declines of the session. ServiceNow is one of the most consistently profitable enterprise AI software companies — but Thursday’s market rotation away from high-growth tech names was indiscriminate.

The NOW narrative:

• ServiceNow has been aggressively expanding its AI-powered enterprise workflow automation capabilities
• The stock trades at a premium multiple — which makes it vulnerable when the market rotates toward defensive or value names
• No company-specific negative catalyst — this is sector rotation, not fundamental deterioration

ServiceNow is due to report Q2 2026 earnings in the coming days — which means Thursday’s 4.7% move represents pre-earnings de-risking by institutional investors who don’t want to hold an elevated-multiple name into a binary event. Post-earnings, if NOW delivers its characteristic beat-and-raise, this move will reverse sharply.

#7 — SNDK (SanDisk Corporation) | Down 5.4% — Memory Carnage Continues

SanDisk has been living a memory chip nightmare for multiple consecutive sessions. The -5.4% Thursday decline comes after previous double-digit drops earlier this month.

The SNDK spiral:

• SanDisk remains one of the most volatile names in the memory chip space — high beta, low fundamental defensibility in a downturn
• The AI memory demand thesis remains valid, but Micron’s aggressive forward guidance last month already pulled forward a lot of buying — now the market is digesting
• SNDK is down sharply from its June highs, when it surged 21%+ on Micron’s blowout earnings; the reversal has been almost as dramatic as the initial spike

Key data point: On July 13, SNDK fell 12.48% in a single session. Adding 5.4% Thursday means the two-week drawdown is significant. At some point, a value investor will see this as an entry, but sentiment remains definitively negative.

#8 — SPCX (SpaceX) | Below IPO Price — Musk Loses Trillionaire Status

SpaceX (SPCX) hit a milestone Thursday that nobody wanted to see: shares fell to $133.93 in pre-market trading — dropping below the $135 IPO price from just weeks ago. Elon Musk, whose trillionaire status was tied to his SpaceX stake’s paper value, is no longer the first trillionaire.

Why SPCX is getting crushed:

The short-seller story is the most important: Short interest at nearly one-third of the public float is extraordinary for a company this size. It creates a dual-edged dynamic — severe downward pressure when the bears are right, but an explosive short-squeeze potential if any positive catalyst emerges (a Starship milestone, a large contract win, or a ceasefire in the Iran conflict).

Historical parallel: SPCX’s IPO attracted $86 billion in June 2026 at a $1.77 trillion valuation. At $133.93, the market is no longer willing to pay that valuation — a chastening correction after the euphoria of the world’s largest-ever IPO.

#9 — GS (Goldman Sachs) | Down 3.76% — Dragging the Dow

Goldman Sachs and Caterpillar were specifically called out as “the two largest holdings in the price-weighted Dow index” dragging Thursday’s index decline, with GS falling 3.76%.

What hit Goldman specifically:

• Goldman had its strongest Q2 in several years earlier this week — the drop Thursday is profit-taking after a multi-day post-earnings rally
• The broader rotation away from financials into defensives accelerated through the afternoon
• The Alphabet (GOOG) Gemini delay headline rattled Goldman, which has significant exposure to AI-related advisory mandates and technology banking

The Goldman context: Q2 2026 results were genuinely strong — investment banking fees recovery, strong equity trading, and wealth management growth. Thursday’s 3.76% pullback is not a reversal of the fundamental story; it’s a valuation reset on a stock that moved significantly post-earnings.

#10 — GOOG (Alphabet Inc.) | Afternoon Collapse — Gemini 3.5 Pro Months Behind

Alphabet’s Thursday decline had a specific, identifiable catalyst: Bloomberg News reported, citing sources familiar with the matter, that Alphabet’s Gemini 3.5 Pro AI model is months behind schedule as the company works to improve its performance.

Why this matters:

• Alphabet had announced Gemini 3.5 Pro in May as part of Google I/O developer conference — a flagship model for Google’s AI positioning
• A months-long delay in its rollout signals internal technical difficulties in a race where every month of delay cedes ground to OpenAI (GPT-5.6), Anthropic (Claude), and Microsoft (Copilot)
• “Declines in Alphabet weighed on the major averages, pulling them to their session lows on Thursday afternoon,” per CNBC
• TheStreet Pro contributor James “Rev Shark” DePorre captured the mood: “Despite positive inflation news and a rotation out of semiconductors and into the Mag7 names, the market is struggling to build positive momentum”

The Alphabet position: GOOG is in an increasingly difficult spot — the company that defined AI-adjacent investing is now repeatedly in the news for AI execution challenges. With OpenAI reportedly delaying its IPO and Anthropic’s Claude gaining enterprise market share, the competitive moat Alphabet long took for granted is being actively contested.

🔗 Alphabet investor relations at abc.xyz/investor

What Thursday’s Losers Are Telling Us

The day’s selloffs cohere into a single narrative: the market is rotating out of AI infrastructure and high-multiple growth, and into defensives and select financials. The winners Thursday — UnitedHealth (+5.6%), Abbott (+10%+), ManpowerGroup (+13%), J.B. Hunt (+6.9%), Cincinnati Financial (+6.8%) — are all defensive, value, or labor market recovery plays.

The key signal from today’s session:

• The VIX at 16.73 (+6%) is not yet at panic levels (20+ would signal genuine fear) — but it is trending in the wrong direction
• Goldman Sachs and Caterpillar are Dow components — their Thursday pullback after strong earnings is a classic “buy the rumor, sell the news” dynamic that should exhaust quickly
• The SPCX below-IPO-price story and Corning’s guidance cut are the only genuine fundamental negatives; the rest are sector rotation moves

Watch Friday: June Housing Starts, Building Permits, and the University of Michigan Consumer Sentiment reading. If consumer sentiment stays resilient — particularly inflation expectations — Friday could see a relief bounce in several of Thursday’s beaten-down names.

Follow TNN for daily stock market news and financial news today.

Disclaimer: This publication is entirely for informational and journalistic purposes and does not constitute formal financial, investment, or legal advice. All market data reflects conditions as of Thursday, July 16, 2026 close. All market investments carry inherent risks of capital loss. Always complete independent due diligence prior to executing equity trades.

Track today’s losers in real-time at Yahoo Finance Losers | Technical charts and analysis at StockCharts.com

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Kasia Davis

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