Top Losers: The Biggest Stock Declines in North America and Why

October 28, 2026 | ATN Trade & Finance

Earnings misses, a cash-flow guidance gap, a sector-wide refining sell-off, and a post-close stumble by one of the world's most-watched ad businesses made this a painful week for investors on the wrong side of the trade. The S&P 500's top losers this week were concentrated in industrials, energy, consumer durables, and — after hours on Wednesday — technology. Here is what drove the largest individual declines and what each one signals.

Xylem (XYL) — Down 14.2% on October 27

Xylem was the S&P 500's single worst performer on Tuesday, falling 14.2% after the water technology company guided full-year results below analyst expectations. Xylem forecast full-year adjusted EPS of $5.35 to $5.60, with a midpoint that fell short of the $5.56 FactSet consensus. Revenue guidance of $9.1 billion to $9.2 billion came in below the $9.32 billion estimate. CFO Bill Grogan framed the shortfall as an intentional reset — the company is reviewing underperforming products, regions, and low-margin business lines as part of a portfolio simplification — but investors didn't reward that explanation. The latest quarter itself showed higher profit and revenues, but the forward guide was the story. Xylem closed at $131.35, and has been roughly flat over the past twelve months, so there was limited tolerance for a guidance cut at current levels.

Boeing (BA) — Down 9.6% to 10.7% on October 27

Boeing reported Q3 2026 results on October 27 to a skeptical market. The headline numbers were actually not bad: revenue of $24.19 billion beat the $23.84 billion LSEG consensus; the GAAP net loss narrowed sharply to $116 million ($0.26 per share) from a $5.3 billion loss ($7.14 per share) a year earlier; free cash flow of $464 million beat the $330 million FactSet estimate. But the adjusted loss of $0.34 per share missed the $0.21 consensus, and — more importantly — Boeing's 2027 free cash flow outlook of approximately $3 billion came in well below Wall Street projections of $5.5 billion to $5.7 billion. The 737 production rate target of 47 aircraft per month has slipped from 2026 into early 2027. Shares fell 9.6% to $170.23 and are now down more than 15% year to date. CEO Kelly Ortberg's message on safety and quality discipline was credible as a cultural fix, but the financial recovery timeline has stretched again, and the market repriced accordingly.

Alphabet (GOOG/GOOGL) — Down 8.7% After Hours on October 28

Alphabet's Q3 2026 report, released after Wednesday's close, was one of the clearest illustrations of a company where one business is firing and the rest are not. Google Cloud revenue of $30.71 billion nearly doubled from $15.16 billion a year earlier and beat the $29.1 billion consensus by more than $1.6 billion. But that was where the good news ended. Google Search revenue of $63.35 billion missed the $64.85 billion estimate. YouTube ad revenue of $11.21 billion came in below $11.43 billion expected. Total revenue of $127.58 billion missed the $127.93 billion consensus. EPS of $2.12 came in well below the approximately $3.00 analyst estimate. Operating income of $40.58 billion missed $43.16 billion expected. Alphabet closed the regular Wednesday session up 1.60% at $321.89, then fell 8.66% to $294.01 in after-hours trading. For trade professionals, the Search shortfall matters beyond finance: Alphabet's ad business is one of the world's most sensitive real-time indicators of global commerce activity. A miss at this scale, in a quarter where the economic data was broadly strong, suggests either AI-driven search disruption is accelerating or ad budgets are being reallocated faster than expected.

Refining Sector: Valero (VLO) -9.2%, Marathon Petroleum (MPC) -7.4%, Phillips 66 (PSX) -7.0% on October 27

Three of the S&P 500's largest refiners fell sharply on Tuesday despite what had been a strong earnings season for the sector. Valero had beaten Q3 2026 estimates handily on October 22 — adjusted EPS of $23.90 versus the $20.30 consensus, revenue of $46.1 billion against a $40.29 billion estimate, with refining margins per barrel roughly tripling year over year to $39.24 from $13.14 in Q3 2025. Marathon and Phillips 66 similarly operated in a strong margin environment through the summer. What turned the sector Tuesday was crude oil: WTI crude settled at $99.90, falling 1.83%, after reports emerged that Iranian leadership was weighing steps toward ending the conflict with US-Israel forces. A potential easing of Middle East supply risk deflates the crude price premium and is typically bad for refiner margins, which depend on the spread between crude input costs and refined product prices. The sell-off reflected a repricing of Q4 2026 crack spread expectations, not any fundamental reversal in Q3 — but energy stocks move fast on geopolitical signals, and the sector-wide drop on a single day illustrates how exposed refining stocks are to a peace development the rest of the market would welcome.

Whirlpool (WHR) — Down 8% on October 27

Whirlpool delivered a double miss in its Q3 2026 earnings, missing both revenue and EPS estimates, and issued guidance that fell short of consensus, sending the stock down approximately 8% on the day. Whirlpool has been one of the year's worst-performing large-cap industrials, having entered Q3 already down sharply after a disastrous Q1 that sent shares to a 17-year low. The challenge has not changed: consumer demand for major appliances in North America has weakened to levels that analysts have compared to recessionary periods. The company operates largely on US-based revenues, making it more exposed than competitors to domestic demand softness and shifts in housing market activity — and with the 10-year Treasury yield now above 5%, housing affordability continues to suppress new home formation in the segments that drive appliance replacement cycles. The week's 6% decline in Sherwin-Williams, also on a narrow Q3 miss, tells the same story from the paint aisle: the residential construction and renovation market is under pressure across multiple categories.

Robinhood (HOOD) — Down 8% Premarket on October 28

Robinhood fell approximately 8% in premarket trading Wednesday after reporting Q3 2026 results that missed analyst expectations on both revenue and earnings. Monthly active users declined from Q2 levels, and the company's Q4 guidance came in well below consensus — a double signal that the retail trading environment is cooling after the activity spike driven by earlier AI stock momentum and crypto volatility. The result landed the same week that Anthropic filed for its IPO, a moment that might have been expected to revive retail engagement — but Robinhood's numbers suggest that high interest rates and equity market sideways action through parts of the fall are compressing the trading volumes its revenue depends on. Robinhood remained the week's notable premarket loser going into Wednesday's session.

Other Notable Decliners

HSBC's US-listed ADR fell 5.7% on October 27 to a six-month low after the bank's Q3 results missed expectations by a significant margin. The miss reflected legal charges weighing on profit alongside softer revenue growth — a pattern that echoed HSBC's earlier 2026 quarters and reflects the bank's exposure to UK and Hong Kong rate environments that are not tracking US rate dynamics. Alexandria Real Estate Equities (ARE) fell 5.9% and Welltower (WELL) fell 5.8% on Tuesday, both reflecting continued pressure on healthcare REITs in a high-rate environment where cap rate compression has reversed. TransUnion (TRU) fell 5.3% in a sell-the-news reaction despite solid Q3 results, as CoStar Group extended its own three-day losing streak — down 5% — amid investor concern about the company's planned Vexcel acquisition.

What this means: This week's losers break into three distinct categories, each with a different signal for trade and supply chain professionals. The first is earnings guidance disappointment — Xylem, Whirlpool, and Robinhood all fell because forward estimates were cut, not because the business has suddenly collapsed. The second is macroeconomic sensitivity — the refiner sell-off on Iran peace news shows how quickly commodity-linked stocks reprice on geopolitical signals that haven't yet affected physical markets. The third is Big Tech ad risk — Alphabet's after-hours drop, if sustained at Thursday's open, removes one of this quarter's most reliable earnings pillars. Importers and exporters should watch the Alphabet miss particularly closely: a meaningful deceleration in digital advertising often precedes pullbacks in marketing and promotional spend, which affects demand signals across retail and consumer goods supply chains.

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Top Losers: The Biggest Stock Declines in North America and Why

Top Losers: The Biggest Stock Declines in North America and Why

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