Last 59 trading days. "Overnight" = today's Open vs the PRIOR day's Close
(the same move plotted as the pink dotted line on the chart) — each day's own Open→Close
move is not counted here. Overnight $/% is what you'd have earned holding only from close
to next open; Cum. Index is the running compounded value shown on the chart's pink line.
Date
Prior Close
Overnight $
Overnight %
Cum. Index
Open
High
Low
Close
2026-07-17
$24.10
+0.24
+1.02%
$24.34
$24.34
$24.67
$23.66
$23.79
2026-07-21
$23.79
-0.08
-0.34%
$24.26
$23.71
$23.95
$23.58
$23.81
2026-07-22
$23.81
+0.44
+1.84%
$24.71
$24.25
$24.25
$23.49
$23.52
2026-07-23
$23.52
+0.43
+1.83%
$25.16
$23.95
$24.01
$21.91
$21.92
2026-07-24
$21.92
-0.62
-2.85%
$24.44
$21.30
$22.48
$21.28
$22.30
2026-07-27
$22.30
+0.08
+0.38%
$24.54
$22.38
$23.29
$22.36
$22.80
2026-07-28
$22.80
+0.45
+2.00%
$25.03
$23.25
$24.26
$23.23
$24.19
2026-07-29
$24.19
-0.04
-0.14%
$24.99
$24.16
$24.88
$23.84
$24.61
2026-07-30
$24.61
-0.76
-3.09%
$24.22
$23.85
$24.09
$23.36
$23.67
2026-07-31
$23.67
-0.23
-0.97%
$23.98
$23.44
$24.14
$23.28
$23.96
2026-08-03
$23.96
+0.47
+1.96%
$24.45
$24.43
$24.89
$24.39
$24.56
2026-08-04
$24.56
-0.16
-0.65%
$24.29
$24.40
$24.97
$24.33
$24.93
2026-08-05
$24.93
-0.02
-0.06%
$24.28
$24.91
$24.93
$24.34
$24.75
2026-08-06
$24.75
+0.24
+0.97%
$24.52
$24.99
$25.20
$24.76
$25.17
2026-08-07
$25.17
-0.18
-0.72%
$24.34
$24.99
$25.50
$24.94
$25.36
2026-08-10
$25.36
-0.20
-0.79%
$24.15
$25.16
$25.23
$24.77
$25.20
2026-08-11
$25.20
-0.16
-0.63%
$23.99
$25.04
$25.68
$25.04
$25.65
2026-08-12
$25.65
-0.11
-0.43%
$23.89
$25.54
$25.63
$25.07
$25.47
2026-08-13
$25.47
+0.16
+0.63%
$24.04
$25.63
$26.26
$25.62
$26.18
2026-08-14
$26.18
+0.13
+0.50%
$24.16
$26.31
$26.49
$26.13
$26.18
2026-08-17
$26.18
-0.30
-1.15%
$23.88
$25.88
$26.08
$25.50
$25.57
2026-08-18
$25.57
+0.33
+1.29%
$24.19
$25.90
$26.27
$25.70
$26.20
2026-08-19
$26.20
-0.06
-0.23%
$24.14
$26.14
$27.04
$26.14
$26.59
2026-08-20
$26.59
-0.02
-0.08%
$24.12
$26.57
$26.76
$26.25
$26.42
2026-08-21
$26.42
+0.15
+0.57%
$24.26
$26.57
$26.96
$26.43
$26.85
2026-08-24
$26.85
+0.05
+0.19%
$24.30
$26.90
$27.18
$26.84
$27.02
2026-08-25
$27.02
-0.12
-0.44%
$24.19
$26.90
$27.35
$26.69
$27.10
2026-08-26
$27.10
+0.01
+0.04%
$24.20
$27.11
$27.27
$26.97
$27.20
2026-08-27
$27.20
-0.39
-1.43%
$23.86
$26.81
$27.03
$26.36
$26.41
2026-08-28
$26.41
+0.33
+1.25%
$24.15
$26.74
$27.11
$26.53
$27.06
2026-08-31
$27.06
-0.23
-0.85%
$23.95
$26.83
$26.97
$26.59
$26.62
2026-09-01
$26.62
-0.10
-0.38%
$23.86
$26.52
$26.76
$26.27
$26.30
2026-09-02
$26.30
+0.19
+0.72%
$24.03
$26.49
$27.19
$26.46
$26.81
2026-09-03
$26.81
+0.08
+0.30%
$24.10
$26.89
$27.13
$26.50
$26.65
2026-09-04
$26.65
-0.03
-0.11%
$24.07
$26.62
$26.73
$26.38
$26.49
2026-09-08
$26.49
-0.18
-0.68%
$23.91
$26.31
$26.40
$25.96
$26.33
2026-09-09
$26.33
-0.13
-0.49%
$23.79
$26.20
$26.25
$24.19
$24.59
2026-09-10
$24.59
+0.01
+0.04%
$23.80
$24.60
$25.34
$24.51
$25.17
2026-09-11
$25.17
+0.04
+0.16%
$23.84
$25.21
$25.41
$25.00
$25.20
2026-09-14
$25.20
+0.13
+0.52%
$23.96
$25.33
$25.45
$24.82
$24.88
2026-09-15
$24.88
-0.27
-1.09%
$23.70
$24.61
$24.76
$24.37
$24.42
2026-09-16
$24.42
-0.04
-0.16%
$23.66
$24.38
$24.47
$23.59
$23.73
2026-09-17
$23.73
+0.07
+0.29%
$23.73
$23.80
$23.94
$22.84
$22.91
2026-09-18
$22.91
-0.25
-1.07%
$23.48
$22.66
$22.91
$22.36
$22.74
2026-09-21
$22.74
+0.06
+0.26%
$23.54
$22.80
$23.08
$22.49
$22.93
2026-09-22
$22.93
+0.16
+0.68%
$23.70
$23.09
$23.13
$22.35
$22.42
2026-09-23
$22.42
-0.06
-0.27%
$23.64
$22.36
$22.87
$22.04
$22.55
2026-09-24
$22.55
+0.15
+0.67%
$23.80
$22.70
$22.80
$22.02
$22.13
2026-09-25
$22.13
-0.37
-1.67%
$23.40
$21.76
$21.98
$21.41
$21.91
2026-09-28
$21.91
+0.01
+0.05%
$23.41
$21.92
$21.96
$21.50
$21.79
2026-09-29
$21.79
-0.04
-0.21%
$23.36
$21.75
$21.81
$21.46
$21.60
2026-09-30
$21.60
+0.11
+0.53%
$23.48
$21.71
$22.00
$21.69
$21.76
2026-10-01
$21.76
+0.20
+0.92%
$23.70
$21.96
$21.96
$21.55
$21.70
2026-10-02
$21.70
+0.22
+1.01%
$23.94
$21.92
$21.92
$21.39
$21.57
2026-10-05
$21.57
-0.00
-0.02%
$23.94
$21.57
$21.62
$21.31
$21.57
2026-10-06
$21.57
+0.18
+0.83%
$24.14
$21.75
$21.76
$21.32
$21.56
2026-10-07
$21.56
-0.30
-1.39%
$23.80
$21.26
$21.43
$20.88
$20.94
2026-10-08
$20.94
-0.03
-0.14%
$23.77
$20.91
$21.23
$20.75
$21.21
2026-10-09
$21.21
-0.32
-1.51%
$23.41
$20.89
$21.03
$20.48
$20.66
📈 Overnight % Gain Trend
Cumulative overnight-only return, indexed to 0% on 2026-07-16
(same window as the chart overlay and table above, just plotted as % instead of $).
🗓️ Overnight End-of-Month PnL
One checkpoint per calendar month (value at the last trading day seen that month) from the
same overnight-only cumulative series above. The first and last
month shown may be partial if the data window doesn't start/end on a month boundary.
Month
Start Value
End Value
PnL $
PnL %
2026-07
$24.10
$23.98
-0.12
-0.48%
2026-08
$23.98
$23.95
-0.04
-0.15%
2026-09
$23.95
$23.48
-0.46
-1.93%
2026-10
$23.48
$23.41
-0.08
-0.33%
📅 Seasonality — Close Price by Year
Each line is one calendar year's close price (or % change from that year's first trading
day, in "% from Jan 1" mode), aligned by month/day so the same point in the calendar lines
up across years. Most recent year is drawn thicker. Click a year in the legend to hide/show it.
🌙 Overnight vs. Intraday Return
Overnight (close→next open) Intraday (open→close)
From 2016-01-04 to 2026-10-09 (2,700 trading days), $1 invested
overnight-only would now be worth $1.23;
$1 invested intraday-only would be worth $0.83.
CMCSA's historical return has leaned mostly on the overnight session.
This reflects a statistical pattern in past prices, not a trading strategy or investment advice —
it ignores transaction costs and slippage.
🎯 Best Strategy Backtest
See which saved strategy has the best real backtested win-rate on CMCSA, with buy/sell triggers plotted right on the chart.