{"slug":"why-stock-quotes-are-delayed-15-minutes","qid":"gap_by_ticker","label":"The 15 minute gap across six household tickers (June 2026)","post_title":"Why Stock Quotes Are Delayed 15 Minutes","post_url":"/blog/why-stock-quotes-are-delayed-15-minutes#q-gap_by_ticker","columns":["ticker","median_gap_pct","p99_gap_pct"],"rows":[{"ticker":"AMD","median_gap_pct":0.361,"p99_gap_pct":2.532},{"ticker":"NVDA","median_gap_pct":0.198,"p99_gap_pct":1.254},{"ticker":"MSFT","median_gap_pct":0.157,"p99_gap_pct":1.008},{"ticker":"AAPL","median_gap_pct":0.147,"p99_gap_pct":0.982},{"ticker":"KO","median_gap_pct":0.108,"p99_gap_pct":0.669},{"ticker":"SPY","median_gap_pct":0.071,"p99_gap_pct":0.593}],"shape":"ranking","sql":"WITH regular_bars AS\n(\n    SELECT\n        ticker,\n        toTimeZone(window_start, 'America/New_York')                      AS et,\n        toTimeZone(window_start, 'America/New_York') + INTERVAL 15 MINUTE AS et_later,\n        toFloat64(close)                                                  AS px\n    FROM global_markets.delayed_stocks_minute_aggs\n    WHERE ticker IN ('SPY', 'KO', 'AAPL', 'MSFT', 'NVDA', 'AMD')\n      AND close > 0\n      AND window_start >= '2026-06-01 00:00:00'\n      AND window_start <  '2026-07-01 00:00:00'\n      AND (toHour(toTimeZone(window_start, 'America/New_York')) * 60\n           + toMinute(toTimeZone(window_start, 'America/New_York'))) >= 570\n      AND (toHour(toTimeZone(window_start, 'America/New_York')) * 60\n           + toMinute(toTimeZone(window_start, 'America/New_York'))) < 960\n)\nSELECT\n    a.ticker                                                                                           AS ticker,\n    round(quantileDeterministic(0.5)(abs(b.px / a.px - 1) * 100, toUInt64(toUnixTimestamp(a.et))), 3)   AS median_gap_pct,\n    round(quantileDeterministic(0.99)(abs(b.px / a.px - 1) * 100, toUInt64(toUnixTimestamp(a.et))), 3)  AS p99_gap_pct\nFROM regular_bars AS a\nINNER JOIN regular_bars AS b ON b.ticker = a.ticker AND b.et = a.et_later\nGROUP BY ticker\nORDER BY median_gap_pct DESC","computed_at":"2026-08-06T15:16:28.114063+00:00","elapsed":0.003442481}