The S&P/TSX Composite Index closed at 36,270.48 on Monday, down 283.44 points or 0.78 percent — the index's steepest single-session drop in nearly a month. Escalating Middle East tensions drove selling across technology and financial shares, two of the TSX's heaviest-weighted sectors, while overall risk appetite deteriorated through the entire session.
The selloff extended the TSX's losing streak to two consecutive sessions. Only three of the ten major sectors finished higher on the day, leaving the remaining seven in the red.
Decliners swamped advancers: 1,440 issues fell against 780 that rose, a decliner-to-advancer ratio of 1.84-to-1. That ratio confirms Monday's damage was not concentrated in a handful of large-caps — it was distributed across the market.
The 52-week statistics delivered the sharpest warning. The TSX recorded 99 new 52-week lows on Monday against just 39 new highs. On Friday, the picture was the inverse: 67 new highs versus 31 new lows. In one session, new 52-week highs fell approximately 42 percent while new 52-week lows more than tripled. The new-high-to-new-low ratio collapsed from 2-to-1 on Friday to 2-to-5 on Monday — a deterioration that signals selling pressure reached stocks well beyond the headline index components.
Volume confirmed the intensity of the move. TSX turnover reached 519.6 million shares, up roughly 30 percent from Friday's 398.6 million shares. Heavy volume on a down day with surging new lows is the internal signature of distribution — institutions reducing exposure rather than retail panic selling.
Geopolitical pressure came from an escalation in the Middle East. Fresh Houthi attacks and renewed concerns about a broader U.S.-Iran conflict drove a risk-off tone across global markets. The S&P 500 fell 0.7 percent to 7,631, the Nasdaq dropped 1.0 percent to 26,100 and the Russell 2000 declined 1.2 percent. The Dow Jones closed at 52,767, down 0.8 percent.
Technology and financials absorbed the heaviest selling on the TSX — the two sectors that led the index's gains over the prior several months and therefore carried the most concentrated institutional positioning to unwind. Materials stocks also fell sharply, hit by a combination of risk-off commodity sentiment and inflation concerns that complicate the Bank of Canada's rate path.
Inflation anxiety compounded the geopolitical pressure. Middle East escalation historically pushes energy prices higher, which feeds directly into headline inflation prints. For a central bank already facing sticky services inflation, an oil-driven price spike narrows the window for rate relief and keeps duration risk elevated across the curve. Longer-dated Canadian government bond yields faced upward pressure as the market repriced the rate outlook.
Despite Monday's damage, the TSX's longer-term technical structure has not broken down. The index has declined in only two of the past seven sessions, meaning the recent weakness remains contained within a broader uptrend. The index sits near its 25-day moving average — a near-term reference traders watch for signs of stabilization or further deterioration — while holding comfortably above both its 50-day and 200-day moving averages. Those longer-term levels define the structural bull trend; the index has not violated either.
The 25-day moving average is the level that matters most in the near term. A close below it on rising volume, paired with continued expansion in new 52-week lows, would shift the internal picture from a short-term pullback to something more serious. Monday's internals — surging lows, heavy volume, negative breadth — make that test more likely than it appeared a week ago.
