Regular-session minutes in the last two weeks of December 2025 (SPY)
Answered against 22 years of US equities and 12 years of US options data and published with the query that produced it. This result is stored as of 2026-10-16, from Tax-Loss Harvesting Deadlines: The Real Dates.
| session_date | session_label | weekday | regular_minutes | full_session_pct |
|---|---|---|---|---|
| 2025-12-15 | Dec 15, 2025 | Mon | 390 | 100 |
| 2025-12-16 | Dec 16, 2025 | Tue | 390 | 100 |
| 2025-12-17 | Dec 17, 2025 | Wed | 390 | 100 |
| 2025-12-18 | Dec 18, 2025 | Thu | 390 | 100 |
| 2025-12-19 | Dec 19, 2025 | Fri | 390 | 100 |
| 2025-12-22 | Dec 22, 2025 | Mon | 390 | 100 |
| 2025-12-23 | Dec 23, 2025 | Tue | 390 | 100 |
| 2025-12-24 | Dec 24, 2025 | Wed | 211 | 54.1 |
| 2025-12-26 | Dec 26, 2025 | Fri | 390 | 100 |
| 2025-12-29 | Dec 29, 2025 | Mon | 390 | 100 |
| 2025-12-30 | Dec 30, 2025 | Tue | 390 | 100 |
| 2025-12-31 | Dec 31, 2025 | Wed | 390 | 100 |
- Rows × columns
- 12 × 5
- Period covered
- to
- Computed
- Completeness
- No missing values
- Source
- US exchange, SIP and OPRA market data
- Licence
- Strasmore terms · free, no signup
What each column holds
| Column | Type | Range | Notes |
|---|---|---|---|
session_date |
date | 2025-12-15 to 2025-12-31 | |
session_label |
text | 12 distinct values (Dec 15, 2025, Dec 16, 2025, Dec 17, 2025…) | |
weekday |
text | 5 distinct values (Fri, Mon, Thu…) | |
regular_minutes |
number | 211 to 390 | |
full_session_pct |
number | 54.1 to 100 | percent |
Computed from Strasmore's warehouse of US exchange, SIP and OPRA market data. Equity prices are delayed; options greeks and implied volatility are end-of-day. This result is stored, not recomputed on load — it is exactly the numbers that were returned on , and the query below is what returned them.
Run it yourself
This is the exact query behind the result above. Change a ticker, a date or a column and run it against the warehouse — no account, no key. The no-signup tier is smaller than the one this page was computed on; a query that reaches past it comes back saying which plan runs it.
SELECT
toString(d) AS session_date,
formatDateTime(d, '%b %e, %Y') AS session_label,
formatDateTime(d, '%a') AS weekday,
toUInt32(bars) AS regular_minutes,
round(toFloat64(bars) / 390 * 100, 1) AS full_session_pct
FROM
(
SELECT
toDate(toTimeZone(window_start, 'America/New_York')) AS d,
count() AS bars
FROM global_markets.delayed_stocks_minute_aggs
WHERE ticker = 'SPY'
AND window_start >= '2025-12-14 00:00:00'
AND window_start < '2026-01-01 00:00:00'
AND (toHour(toTimeZone(window_start, 'America/New_York')) * 60
+ toMinute(toTimeZone(window_start, 'America/New_York'))) >= 570
AND (toHour(toTimeZone(window_start, 'America/New_York')) * 60
+ toMinute(toTimeZone(window_start, 'America/New_York'))) < 960
GROUP BY d
)
ORDER BY d
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