{"slug":"pcap-market-data-and-replay","qid":"session_pace","label":"Trade prints per second across the electronic day, June 10 2026","post_title":"PCAP Market Data: How Market Replay Works","post_url":"/blog/pcap-market-data-and-replay#q-session_pace","columns":["et_time","aapl_prints_per_sec","spy_prints_per_sec"],"rows":[{"et_time":"04:00","aapl_prints_per_sec":10.45,"spy_prints_per_sec":3.12},{"et_time":"04:15","aapl_prints_per_sec":0.25,"spy_prints_per_sec":0.42},{"et_time":"04:30","aapl_prints_per_sec":0.6,"spy_prints_per_sec":0.36},{"et_time":"04:45","aapl_prints_per_sec":0.71,"spy_prints_per_sec":0.55},{"et_time":"05:00","aapl_prints_per_sec":0.38,"spy_prints_per_sec":0.62},{"et_time":"05:15","aapl_prints_per_sec":0.5,"spy_prints_per_sec":0.6},{"et_time":"05:30","aapl_prints_per_sec":0.44,"spy_prints_per_sec":0.31},{"et_time":"05:45","aapl_prints_per_sec":0.24,"spy_prints_per_sec":0.64},{"et_time":"06:00","aapl_prints_per_sec":0.3,"spy_prints_per_sec":0.26},{"et_time":"06:15","aapl_prints_per_sec":0.34,"spy_prints_per_sec":0.49},{"et_time":"06:30","aapl_prints_per_sec":0.27,"spy_prints_per_sec":0.34},{"et_time":"06:45","aapl_prints_per_sec":0.39,"spy_prints_per_sec":0.42},{"et_time":"07:00","aapl_prints_per_sec":1.06,"spy_prints_per_sec":9.08},{"et_time":"07:15","aapl_prints_per_sec":0.75,"spy_prints_per_sec":3.54},{"et_time":"07:30","aapl_prints_per_sec":0.86,"spy_prints_per_sec":1.96},{"et_time":"07:45","aapl_prints_per_sec":1.06,"spy_prints_per_sec":1.5},{"et_time":"08:00","aapl_prints_per_sec":0.69,"spy_prints_per_sec":1.06},{"et_time":"08:15","aapl_prints_per_sec":0.67,"spy_prints_per_sec":2.25},{"et_time":"08:30","aapl_prints_per_sec":2.09,"spy_prints_per_sec":10.79},{"et_time":"08:45","aapl_prints_per_sec":1.26,"spy_prints_per_sec":2.38},{"et_time":"09:00","aapl_prints_per_sec":1.4,"spy_prints_per_sec":1.92},{"et_time":"09:15","aapl_prints_per_sec":1.39,"spy_prints_per_sec":2.06},{"et_time":"09:30","aapl_prints_per_sec":98.64,"spy_prints_per_sec":53.71},{"et_time":"09:45","aapl_prints_per_sec":55.67,"spy_prints_per_sec":47.92},{"et_time":"10:00","aapl_prints_per_sec":52.91,"spy_prints_per_sec":35.23},{"et_time":"10:15","aapl_prints_per_sec":53.22,"spy_prints_per_sec":40.4},{"et_time":"10:30","aapl_prints_per_sec":62.84,"spy_prints_per_sec":41.78},{"et_time":"10:45","aapl_prints_per_sec":48,"spy_prints_per_sec":45.44},{"et_time":"11:00","aapl_prints_per_sec":44.97,"spy_prints_per_sec":46.03},{"et_time":"11:15","aapl_prints_per_sec":43.48,"spy_prints_per_sec":40.91},{"et_time":"11:30","aapl_prints_per_sec":41.58,"spy_prints_per_sec":32.51},{"et_time":"11:45","aapl_prints_per_sec":50.39,"spy_prints_per_sec":64.01},{"et_time":"12:00","aapl_prints_per_sec":41.24,"spy_prints_per_sec":30.28},{"et_time":"12:15","aapl_prints_per_sec":29.88,"spy_prints_per_sec":20.18},{"et_time":"12:30","aapl_prints_per_sec":26.92,"spy_prints_per_sec":18.41},{"et_time":"12:45","aapl_prints_per_sec":26.55,"spy_prints_per_sec":19.42},{"et_time":"13:00","aapl_prints_per_sec":22.35,"spy_prints_per_sec":25.52},{"et_time":"13:15","aapl_prints_per_sec":23.87,"spy_prints_per_sec":23.73},{"et_time":"13:30","aapl_prints_per_sec":24.86,"spy_prints_per_sec":24.06},{"et_time":"13:45","aapl_prints_per_sec":35.12,"spy_prints_per_sec":33.37},{"et_time":"14:00","aapl_prints_per_sec":29.86,"spy_prints_per_sec":29.61},{"et_time":"14:15","aapl_prints_per_sec":25.77,"spy_prints_per_sec":24.93},{"et_time":"14:30","aapl_prints_per_sec":24.38,"spy_prints_per_sec":27.96},{"et_time":"14:45","aapl_prints_per_sec":25.9,"spy_prints_per_sec":36.23},{"et_time":"15:00","aapl_prints_per_sec":26.93,"spy_prints_per_sec":29.06},{"et_time":"15:15","aapl_prints_per_sec":33.72,"spy_prints_per_sec":46.13},{"et_time":"15:30","aapl_prints_per_sec":29.7,"spy_prints_per_sec":48.94},{"et_time":"15:45","aapl_prints_per_sec":75.53,"spy_prints_per_sec":100.76},{"et_time":"16:00","aapl_prints_per_sec":2.29,"spy_prints_per_sec":8.43},{"et_time":"16:15","aapl_prints_per_sec":1.14,"spy_prints_per_sec":2.59},{"et_time":"16:30","aapl_prints_per_sec":1.06,"spy_prints_per_sec":1.5},{"et_time":"16:45","aapl_prints_per_sec":1.23,"spy_prints_per_sec":1.69},{"et_time":"17:00","aapl_prints_per_sec":1.6,"spy_prints_per_sec":0.87},{"et_time":"17:15","aapl_prints_per_sec":0.9,"spy_prints_per_sec":0.52},{"et_time":"17:30","aapl_prints_per_sec":0.85,"spy_prints_per_sec":1.19},{"et_time":"17:45","aapl_prints_per_sec":0.89,"spy_prints_per_sec":1.04},{"et_time":"18:00","aapl_prints_per_sec":1.52,"spy_prints_per_sec":2.49},{"et_time":"18:15","aapl_prints_per_sec":1.09,"spy_prints_per_sec":0.56},{"et_time":"18:30","aapl_prints_per_sec":1.02,"spy_prints_per_sec":0.92},{"et_time":"18:45","aapl_prints_per_sec":1.01,"spy_prints_per_sec":0.98},{"et_time":"19:00","aapl_prints_per_sec":0.89,"spy_prints_per_sec":1.37},{"et_time":"19:15","aapl_prints_per_sec":1.21,"spy_prints_per_sec":2.18},{"et_time":"19:30","aapl_prints_per_sec":1.45,"spy_prints_per_sec":0.89},{"et_time":"19:45","aapl_prints_per_sec":1.23,"spy_prints_per_sec":0.79}],"shape":"series","sql":"SELECT\n    formatDateTime(toStartOfInterval(toTimeZone(window_start, 'America/New_York'), INTERVAL 15 MINUTE), '%H:%i') AS et_time,\n    round(sumIf(transactions, ticker = 'AAPL') / 900, 2) AS aapl_prints_per_sec,\n    round(sumIf(transactions, ticker = 'SPY') / 900, 2)  AS spy_prints_per_sec\nFROM global_markets.delayed_stocks_minute_aggs\nWHERE ticker IN ('AAPL', 'SPY')\n  AND window_start >= '2026-06-10 08:00:00'\n  AND window_start <  '2026-06-11 00:00:00'\nGROUP BY et_time\nORDER BY et_time","computed_at":"2026-08-12T15:31:28.193526+00:00","elapsed":0.001715514}