How much did STX move each index today?
S&P 500: STX moved −3.80% and contributed −0.5 points of the index's −4.3-point move (12% of it), ranking #20 of 490 members by contribution to the move.
NASDAQ 100: STX moved −3.80% and contributed −10.5 points of the index's −218.5-point move (5% of it), ranking #19 of 98 members by contribution to the move.
XLK: STX moved −3.80% and contributed −0.08 points of the index's −2.46-point move (3% of it), ranking #18 of 72 members by contribution to the move.
STX closed the 2026-10-12 session at 753.25; that day's move sits in the 16th percentile of its own past year. The stock is 31.1% below its 52-week closing high and +174.2% for the year so far.
STX in the S&P 500 beyond today
| window | STX return | points contributed | index move | rank |
|---|---|---|---|---|
| 1 week | −15.09% | −3.3 pts | +33.3 pts | #497 of 503 |
| 1 month | −9.19% | −1.8 pts | +150.3 pts | #487 of 503 |
| quarter to date | −18.33% | −4.2 pts | +155.7 pts | #501 of 503 |
| year to date | +174.22% | +15.4 pts | +961.7 pts | #18 of 503 |
Who moved with and against STX today?
On STX's side of the S&P 500 tape: NVDA (−5.2 pts), MU (−3.4 pts), AVGO (−2.4 pts). Pulling the other way: AAPL (+4.5 pts), META (+3.7 pts), MSFT (+3.2 pts).
Every member's contribution, top to bottom, is on the index dashboards; the day's story is in the market-close note. Machine-readable figures for this stock: /api/stock/STX, free to cite with attribution.