Pre-market price movements and significant market activity for Steel Dynamics Inc ($STLD). Each move is flagged by Z-score statistical significance — showing when $STLD moved beyond its typical daily range. 5 significant moves detected in the last 30 days.
Current Market State
What May Be Driving STLD?
STLD shares fell 4.58% after issuing third-quarter earnings guidance that came in below Wall Street expectations.
Steel Dynamics Inc operates in the Industrials sector, specifically Steel Works, Blast Furnaces & Rolling Mills (Coke Ovens). Sector-wide movement can contribute to individual stock volatility.
Recent Unusual Moves (30 days)
| Date | Session | Price | Move | Z-Score | Rel. Vol. |
|---|---|---|---|---|---|
| Sep 18, 2026 | Regular | $236.07 | -3.78% | -2.22 | 1.0× |
| Sep 18, 2026 | After-hours | $235.26 | -4.11% | -2.39 | 1.1× |
| Sep 17, 2026 | After-hours | $234.42 | -4.45% | -2.05 | 0.7× |
| Sep 15, 2026 | Pre-market | $242.97 | +3.60% | 2.40 | — |
| Sep 11, 2026 | Pre-market | $246.00 | +3.76% | 2.51 | — |
About STLD Premarket Movers
This page tracks unusual market activity for Steel Dynamics Inc (STLD) across all trading sessions — pre-market (4:00 AM–9:30 AM ET), regular hours (9:30 AM–4:00 PM ET), and after-hours (4:00 PM–8:00 PM ET). A move is flagged as "unusual" when its Z-score reaches 2 or higher, meaning the price change is statistically significant relative to STLD's recent daily volatility.
Z-score is calculated by comparing each move to the 20-day average return and standard deviation. A Z-score of 2.0 means the move is 2 standard deviations beyond the average — occurring in roughly the top 5% of daily moves. Relative volume (RVOL) compares current volume to the 20-day average volume at the same time of day, helping distinguish genuine institutional activity from noise.