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

October 27, 2026 | ATN Trade & Finance

Even on a day when the S&P 500 closed up 0.60% and the Nasdaq gained more than 1%, a cluster of North American stocks had a rough session. Boeing's Q3 earnings triggered the worst single-day drop for the stock since April 2025. A water infrastructure company cut its full-year outlook and announced divestitures. An energy-sector repricing hit the entire refining industry. And the Federal Trade Commission handed one corporate deal a serious threat. Here is the full breakdown of October 27's biggest decliners and what drove each move.

Boeing (BA): −10.7% — The Worst Day Since April 2025

Boeing was the session's most significant story. Shares fell approximately 10.7% to around $168–$170, the worst single-day move for the stock since April 3, 2025, and close to the company's 52-week low of $168.42. The catalyst was a Q3 earnings report that missed on the bottom line and delivered unwelcome news on the production timeline investors had been counting on.

Adjusted EPS came in at −$0.34, worse than the −$0.25 consensus estimate. Revenue of $24.19 billion narrowly beat the $23.95 billion estimate and rose 3.9% year over year, but that was not the number the market was watching. Boeing confirmed it will miss its 500-aircraft delivery target for 2026 — a number management had repeatedly cited as the year's defining operational commitment. The 737 MAX production rate of 47 jets per month, previously guided to be reached by summer 2026, is now not expected until early 2027; the ramp to 52 jets per month has been pushed to the second half of 2027, a significant delay that pushes the company's cash generation timeline further into the future.

Free cash flow for the quarter was $464 million, and the company guided full-year 2026 FCF at approximately $3 billion — roughly $2.5 billion below the $5.5 billion analyst consensus. Wing production remains the key manufacturing constraint, and net debt ended the quarter at $25.2 billion. The quarterly FCF figure was also affected by roughly $700 million in Department of Justice settlement payments. Management did note that the 777-9 program remains on track for certification by mid-2027, but that was not enough to offset the headline delivery miss.

Xylem (XYL): −11.6% to −14% — Revenue Miss and a Guidance Cut

Xylem, the global water technology and infrastructure company, fell between 11.6% and 14% depending on the closing measure used, hitting a new 52-week low. The company reported Q3 revenue of $2.20 billion, down 3% year over year and roughly 3.5% below the $2.28 billion consensus estimate. Adjusted EPS of $1.44 narrowly missed the $1.45 estimate.

The bigger problem was the guidance revision. Xylem cut its full-year 2026 revenue midpoint to $8.95 billion (from $9.2 billion), and reduced its adjusted EPS midpoint to $5.43 (from $5.63). Alongside the results, the company announced it would divest two businesses — Applied Water International and Specialty Flow Control — and reorganize its four operating segments into three beginning in 2027. The combination of a revenue miss, guidance cut, and unexpected structural change is the kind of multi-factor surprise that typically produces a sharp single-day reaction, and it did here.

Watsco (WSO): −8.3% — Record Sales, Earnings Miss

Watsco, the HVAC equipment distributor, fell approximately 8.3% after posting Q3 results that showed the headline paradox investors dislike most: record sales accompanied by a significant earnings miss. Revenue of $2.22 billion set a company record for the quarter, narrowly beating the $2.2 billion consensus. But adjusted EPS of $3.77 missed the $4.12 estimate by $0.35 — a miss of nearly 9% on the bottom line. The gap between volume and profitability is the story here, and with 10 of 12 analyst EPS revisions running negative in the prior 90 days, the sell-side had already been flagging concerns about Watsco's margins going into the print.

Valero Energy (VLO): −7.9% — Refiner Selloff on Iran and Crack Spreads

Valero led a broader energy and refining sector decline that analysts called the worst single day for refiner stocks since the April 2025 tariff shock. Shares fell 7.93%, with Marathon Petroleum (MPC) and Phillips 66 (PSX) down alongside it. The driver was a combination of factors that hit refining economics simultaneously: easing US-Iran diplomatic signals reduced the geopolitical risk premium embedded in crude oil prices, compressing the spread between input costs and product revenue that refiners depend on. An analyst at Freedom Broker downgraded Valero to Sell with a $358 price target, citing forward crack spread forecasts falling toward $30 per barrel. The energy sector (XLE) fell approximately 2.1% on the day, making it the worst-performing sector in the S&P 500.

Cintas (CTAS): −7.1% — FTC Moves Against UniFirst Deal

Cintas dropped 7.1% after Semafor reported that the Federal Trade Commission intends to sue to block the company's proposed $5.5 billion acquisition of UniFirst, the workwear and facility services company. The FTC's concern centers on antitrust risk — Cintas and UniFirst are two of the largest uniform rental and facility services companies in North America, and their combination would substantially concentrate the market. UniFirst (UNF) fell approximately 9% on the same news; deal arbitrage spreads widened sharply as traders priced in the probability that the transaction does not close on its original terms. The outcome will turn on whether the FTC proceeds to litigation or whether the companies agree to divestitures as a condition of approval.

Hilton Worldwide (HLT): −4.5% — Revenue Miss, Q4 Caution

Hilton fell 4.5% to $336.16 despite reporting adjusted EPS of $2.45, which beat the $2.37 consensus. The problem was revenue: Q3 came in at $3.33 billion, up 6.6% year over year but roughly $50 million below the $3.38 billion estimate. Management raised full-year adjusted EPS guidance to $9.10 at the midpoint, but the market focused on forward commentary: Hilton's leadership flagged that the November 3 midterm elections and continued Middle East conflict could weigh on Q4 travel bookings, particularly for group and business travel. When a hospitality company issues election and geopolitical warnings alongside a revenue miss, the market tends to reprice the forward multiple.

Others Worth Noting

Euronet Worldwide (EEFT) fell 6.57% after missing both revenue and profit estimates — the payments and digital currency company does not have the same name recognition as the stocks above, but it was one of the day's larger percentage declines in the S&P 500. Sherwin-Williams (SHW) continued to digest its earnings miss from yesterday, falling a further 3.4%. The broader energy complex was the sector theme of the session, with declining refinery margins pulling down a range of names beyond Valero alone.

What this means: The day's losers largely fall into two categories: companies that failed to deliver on operational commitments they had made — Boeing and Xylem most clearly — and companies caught in external repricing events they had no control over, like Valero in the refiner selloff and Cintas in a regulatory action. The Boeing story is the one with the longest-running consequences: a miss on delivery targets delayed the company's cash generation recovery timeline, and each such delay has compounding effects on an already debt-heavy balance sheet. The Xylem and Watsco patterns — a combination of margin pressure and guidance cuts — suggest that the industrial sector's Q3 earnings season is producing more mixed results than the headline S&P 500 gain implies. For the broader market, today's winners and losers together illustrate the earnings season dynamic: a rising index can coexist with very painful individual-stock outcomes for anyone positioned in the wrong names.

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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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