Where S&P 500 ETF SPY’s ADX sat on August 21, 2026
Educational reference. Measured from 287 recorded 1m bars of SPY on Friday, August 21, 2026.
ADX crossed above 25 6 separate times during the session, and the typical visit lasted 8 minutes.
Across the whole session it sat above 25 for 42.5% of the time, between 20 and 25 for 15.7%, and below 20 for 41.8%.
| Band | Share of session | Bars | Separate visits | Median visit | Longest visit |
|---|---|---|---|---|---|
| Above 25 | 42.5% | 122 | 6 | 8 min | 69 min |
| Between 20 and 25 | 15.7% | 45 | 12 | 4 min | 9 min |
| Below 20 | 41.8% | 120 | 6 | 18 min | 38 min |
Why the visit count matters more than the percentage
A share of the session says how much time a reading spent in a band. It does not say whether that time came as one sustained stretch or as repeated brief excursions. Here the reading entered the zone above 25 6 times and left it 6 times, with a median stay of 8 minutes and a longest stay of 69 minutes beginning at 04:02 ET. Below 20 there were 6 visits, a median of 18 minutes and a longest of 38 minutes.
Where in the session it happened
| Hour (ET) | Above 25 | Between | Below 20 | Bars |
|---|---|---|---|---|
| 04:00 | 98% | 2% | 0% | 52 |
| 05:00 | 42% | 12% | 47% | 43 |
| 06:00 | 6% | 31% | 63% | 52 |
| 07:00 | 48% | 14% | 38% | 58 |
| 08:00 | 22% | 22% | 57% | 60 |
| 09:00 | 41% | 9% | 50% | 22 |
Same reading, previous session: SPY 1m ADX, August 20, 2026
What this is and is not
This is a record of where one indicator sat during one completed session. It is not a prediction, and it makes no claim that any reading preceded a move. Whether crossing 25 tends to be followed by a larger move is a separate question, measured separately.
How this was measured
Every 1m bar recorded for SPY on Friday, August 21, 2026 — 287 bars from 04:01 to 09:21 ET — was classified by its ADX reading. A visit is an unbroken run of consecutive bars in the same band. The session was complete before this page was built.