Another AI-Led Ugly Reversal Day as Indexes’ Early Gains Turned to Losses

The Canadian Vanguard Stock Market Report – Thursday November 20, 2025 Edition

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The Toronto Market

The S&P/TSX Composite fell 371.86 points, or 1.23%, to close at 29,906.55. It was a difficult session across the markets, with all major indexes finishing in the red. Although markets opened above yesterday’s close, momentum faded by mid-day, and the decline continued steadily until the closing bell.

                                                                                                                                                                                     

Today’s Market Statistics

Toronto’s market breadth skewed sharply negative today. On the TSX, declining issues outnumbered advancing issues by roughly three to one, with 1,564 decliners versus 564 advancers, resulting in a decliner-to-advancer ratio of 2.77 to 1. An additional 113 issues finished unchanged.

The exchange recorded 73 new 52-week highs and 58 new 52-week lows, compared with 44 highs and 51 lows yesterday.

Total trading volume rose to 467,441,123 shares, a 1% increase from the 423,997,062 shares traded in the previous session.

Toronto Market Wrap-Up Report

The Toronto market endured another sharp reversal today as early strength evaporated and broad selling took hold. Nearly every sector finished lower, with Basic Materials plunging 4.48% to lead the decline. Durable Consumer Goods & Services was the only sector to close in positive territory.

Breadth deteriorated throughout the session, and elevated volume confirmed that the selling pressure was decisive. Despite the weakness, a rise in new highs shows that select pockets of strength remain, underscoring widening divergence between market leaders and laggards.

Celestica (TSX: CLS) slid 9.5% to $398.02, while Aritzia (TSX: ATZ) managed a slight gain, rising 0.24% to $101.74.

With the TSX falling back below the 30,000 level—last breached on November 7—investors should remain cautious. This is a time to refine watchlists, focus on emerging strength, and avoid aggressive dip-buying until stability returns.

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The US Markets

All major North American indexes posted steep losses today, reflecting a broad retreat from risk assets. The Dow Jones Industrial Average fell 386.51 points (-0.84%) to close at 45,752.26, while the S&P 500 dropped 103.40 points (-1.56%) to 6,538.76. The Nasdaq Composite experienced the sharpest decline among the large-cap benchmarks, sliding 486.18 points (-2.15%) to finish at 22,078.05.

The Russell 2000, a key gauge of small-cap performance and broader market risk appetite, fell 42.78 points (-1.82%) to 2,305.11. A decline approaching—or exceeding—2% in an index with hundreds or thousands of constituents is notable, as it typically signals widespread selling pressure rather than weakness confined to a few influential names.

     

New York Stock Exchange (NYSE): Market breadth on the NYSE was decisively negative, with 3,381 decliners overwhelming 1,041 advancers, along with 333 unchanged issues. This produced a decliner-to-advancer ratio of 3.25 to 1, signaling broad-based selling pressure across the exchange.

New lows expanded sharply even as new highs increased:

• 93 new 52-week highs (up from 33 yesterday)
• 269 new 52-week lows (up from 139 yesterday)

The pickup in both highs and lows suggests heightened dispersion and rising volatility.
Total NYSE volume reached 5.69 billion shares, about 12% higher than yesterday’s 5.09 billion, confirming stronger participation behind the day’s decline.

NASDAQ: Breadth was similarly weak on the NASDAQ, where 3,585 decliners outnumbered 1,168 advancers, with 254 unchanged, resulting in a 3.07 to 1 decliner-to-advancer ratio—nearly identical to the NYSE’s imbalance.

New 52-week levels also reflected increased stress in growth-oriented names:

• 119 new highs (up from 80 yesterday)
• 473 new lows (up from 379 yesterday)

Trading activity surged, with total NASDAQ volume rising to 10.90 billion shares, a 23% increase from yesterday’s 8.83 billion. The volume spike reinforces the view that today’s sell-off was driven by strong conviction rather than light or mechanical trading.

The indexes are down while the volume is up and that further emphasizes our call for caution when trading.

U.S. Market Wrap-Up Report

The U.S. market endured another difficult session today as broad selling took hold across nearly all sectors. Durable Consumer Goods & Services was the only sector to finish in positive territory, while Technology and Basic Materials led the decline and were the day’s laggards. With the exception of the Dow Jones Industrial Average, major indexes fell into the 2% decline range, signaling widespread weakness.

Trading activity surged, with share volume rising 23% on the NASDAQ and 12% on the NYSE, confirming that the sell-off was driven by strong conviction rather than thin trading.

Market Drivers

The session began with optimism following Nvidia Corp.’s strong earnings report, released after hours yesterday. Early gains across the major indexes were fueled by enthusiasm around AI and semiconductor strength. However, that momentum faded by midday.

Two major concerns resurfaced and ultimately triggered the afternoon sell-off:

1. Fed Rate-Cut Expectations Reduced – Analysts lowered the probability of a near-term Federal Reserve rate cut to around 40%, pressuring growth and technology-oriented stocks.
2. Concerns Over Lofty AI Valuations – Renewed skepticism about high valuations in AI-driven names weighed heavily on the sector, overwhelming the morning’s Nvidia-induced optimism.

The market also largely ignored the long-delayed U.S. labor market report, despite its relatively positive tone—demonstrating how dominant macro concerns and valuation pressures have become.

Key Decliners

The steepest losses were concentrated in the semiconductor and storage industries:

•    Micron Technology (MU) fell 10.87% (-$24.55) to close at $206.02, with 47.4M shares traded.
•    SanDisk Corporation (SNDK) plunged 20.33% (-$50.00) to finish at $195.96.
•    Competitors Western Digital (WDC) and Seagate Technology (STX)—both strong performers over the past two weeks—also dropped 7% or more.

Nvidia (NVDA) slipped 3.15% to $180.64, with 343.5M shares traded. The stock once again tested the $180 level, which has acted as a support zone over the past two months.

Notable Performers

Despite the heavy selling—75% of NYSE stocks declined today—a few names stood out on the upside in the small-caps category today:

•    Rigel Pharmaceuticals (RIGL) gained 5.18% (+$2.16) to close at $43.84, with 695.5k shares  traded.
•    AnaptysBio (ANAB) added 1.76% (+$0.65) to end at $37.66, on 497.2k shares traded.

Outlook

Given today’s reversal and sector-wide weakness, traders should approach the market cautiously. The mix of shifting rate expectations, stretched valuations in high-growth areas, and elevated trading volume suggests that volatility may remain elevated until the broader outlook becomes clearer.

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NOTICE TO READERS 

Our readers are strongly advised to conduct their research into individual stocks before making a purchase decision. In addition, investors are advised that past stock performance is no guarantee of future price appreciation. Any recommendation is not a guarantee of any particular stock’s future prices, and The Canadian Vanguard accepts no responsibility or liability for investors’ or readers’ purchases.

The Canadian Vanguard’s Stock Market Reports, https://www.thecanadianvanguard.com/category/stock-markets/ , are composed by senior Financial Industry and Information Technology professionals. We deliberately neither engage nor deploy AI tools to produce data for these reports.

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(c) This article is published by The Canadian Vanguard on November 20, 2025.