{"slug":"how-after-market-orders-work","qid":"phase_split","label":"Share of monthly volume by session phase, September 2026","post_title":"How After-Market Orders Work: AMO vs Live","post_url":"/blog/how-after-market-orders-work#q-phase_split","columns":["ticker","premarket_share_pct","regular_share_pct","after_hours_share_pct"],"rows":[{"ticker":"SPY","premarket_share_pct":2.57,"regular_share_pct":82.44,"after_hours_share_pct":14.99},{"ticker":"KO","premarket_share_pct":0.79,"regular_share_pct":92.71,"after_hours_share_pct":6.51},{"ticker":"NVDA","premarket_share_pct":4.35,"regular_share_pct":89.96,"after_hours_share_pct":5.69},{"ticker":"MSFT","premarket_share_pct":2.68,"regular_share_pct":92.06,"after_hours_share_pct":5.26},{"ticker":"AAPL","premarket_share_pct":1.89,"regular_share_pct":93.62,"after_hours_share_pct":4.49}],"shape":"ranking","sql":"WITH bars AS\n(\n    SELECT\n        ticker,\n        toHour(toTimeZone(window_start, 'America/New_York')) * 60\n            + toMinute(toTimeZone(window_start, 'America/New_York')) AS et_min,\n        volume\n    FROM global_markets.delayed_stocks_minute_aggs\n    WHERE ticker IN ('AAPL', 'MSFT', 'NVDA', 'SPY', 'KO')\n      AND window_start >= '2026-09-01 04:00:00'\n      AND window_start <  '2026-10-01 04:00:00'\n)\nSELECT\n    ticker,\n    round(100 * sumIf(volume, et_min >= 240 AND et_min < 570) / sum(volume), 2) AS premarket_share_pct,\n    round(100 * sumIf(volume, et_min >= 570 AND et_min < 960) / sum(volume), 2) AS regular_share_pct,\n    round(100 * sumIf(volume, et_min >= 960 AND et_min < 1200) / sum(volume), 2) AS after_hours_share_pct\nFROM bars\nGROUP BY ticker\nORDER BY after_hours_share_pct DESC","computed_at":"2026-10-06T15:19:29.714743+00:00","elapsed":0.003886293}