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
Open
High
Low
Close
Prior Close
Overnight $
Overnight %
Cum. Index
2026-06-09
$910.00
$911.29
$801.89
$846.01
$876.77
+33.23
+3.79%
$910.00
2026-06-16
$1,044.03
$1,097.00
$1,012.17
$1,031.34
$846.01
+198.02
+23.41%
$1,123.00
2026-06-17
$1,044.25
$1,094.00
$1,043.90
$1,066.07
$1,031.34
+12.91
+1.25%
$1,137.06
2026-06-18
$1,133.36
$1,145.00
$1,053.53
$1,070.23
$1,066.07
+67.29
+6.31%
$1,208.83
2026-06-22
$1,089.00
$1,127.99
$1,068.96
$1,094.04
$1,070.23
+18.77
+1.75%
$1,230.03
2026-06-23
$984.26
$1,044.88
$983.00
$1,038.59
$1,094.04
-109.78
-10.03%
$1,106.60
2026-06-25
$1,106.66
$1,110.00
$1,001.33
$1,025.36
$1,038.59
+68.07
+6.55%
$1,179.13
2026-06-26
$994.00
$996.48
$880.49
$899.90
$1,025.36
-31.36
-3.06%
$1,143.07
2026-06-29
$915.99
$987.57
$880.01
$968.53
$899.90
+16.09
+1.79%
$1,163.50
2026-06-30
$967.56
$998.49
$939.47
$965.00
$968.53
-0.97
-0.10%
$1,162.34
2026-07-01
$898.55
$936.65
$886.20
$915.19
$965.00
-66.45
-6.89%
$1,082.30
2026-07-02
$900.75
$923.06
$795.66
$820.16
$915.19
-14.44
-1.58%
$1,065.22
2026-07-07
$821.31
$837.75
$786.01
$827.64
$820.16
+1.15
+0.14%
$1,066.72
2026-07-08
$811.27
$862.41
$811.27
$860.02
$827.64
-16.37
-1.98%
$1,045.62
2026-07-09
$922.28
$937.54
$888.51
$890.09
$860.02
+62.26
+7.24%
$1,121.32
2026-07-10
$861.63
$927.28
$861.63
$910.34
$890.09
-28.46
-3.20%
$1,085.47
2026-07-13
$869.60
$877.73
$840.01
$860.66
$910.34
-40.74
-4.48%
$1,036.89
2026-07-14
$901.13
$906.30
$868.93
$878.31
$860.66
+40.48
+4.70%
$1,085.65
2026-07-15
$889.02
$893.00
$788.97
$828.30
$878.31
+10.71
+1.22%
$1,098.89
2026-07-16
$785.11
$798.75
$739.48
$745.49
$828.30
-43.19
-5.21%
$1,041.59
2026-07-17
$720.94
$808.65
$700.39
$787.66
$745.49
-24.55
-3.29%
$1,007.29
2026-07-21
$864.00
$899.95
$845.00
$891.83
$787.66
+76.34
+9.69%
$1,104.91
2026-07-22
$864.99
$921.38
$863.70
$908.10
$891.83
-26.84
-3.01%
$1,071.66
2026-07-23
$905.00
$936.49
$905.00
$913.36
$908.10
-3.10
-0.34%
$1,068.00
2026-07-24
$879.21
$906.00
$835.50
$851.69
$913.36
-34.15
-3.74%
$1,028.07
2026-07-27
$851.75
$870.79
$781.17
$816.99
$851.69
+0.06
+0.01%
$1,028.14
2026-07-28
$776.14
$777.10
$698.99
$747.30
$816.99
-40.85
-5.00%
$976.73
2026-07-29
$786.85
$814.97
$747.55
$764.43
$747.30
+39.55
+5.29%
$1,028.42
2026-07-30
$878.91
$901.18
$831.00
$851.68
$764.43
+114.48
+14.98%
$1,182.44
2026-07-31
$901.68
$921.78
$837.73
$856.13
$851.68
+50.00
+5.87%
$1,251.86
2026-08-03
$818.01
$839.63
$782.08
$831.06
$856.13
-38.12
-4.45%
$1,196.12
2026-08-04
$880.88
$885.00
$833.97
$845.35
$831.06
+49.83
+6.00%
$1,267.83
2026-08-05
$848.13
$884.90
$836.56
$837.66
$845.35
+2.78
+0.33%
$1,272.00
2026-08-06
$784.00
$874.97
$767.69
$852.95
$837.66
-53.65
-6.41%
$1,190.52
2026-08-07
$862.68
$862.68
$761.80
$812.76
$852.95
+9.73
+1.14%
$1,204.10
2026-08-10
$802.95
$826.89
$786.00
$800.99
$812.76
-9.81
-1.21%
$1,189.57
2026-08-11
$805.00
$826.90
$794.01
$820.52
$800.99
+4.01
+0.50%
$1,195.53
2026-08-12
$861.35
$891.98
$849.60
$878.21
$820.52
+40.83
+4.98%
$1,255.02
2026-08-13
$872.31
$934.77
$861.55
$921.37
$878.21
-5.90
-0.67%
$1,246.58
2026-08-14
$941.26
$990.61
$920.00
$973.44
$921.37
+19.89
+2.16%
$1,273.49
2026-08-17
$990.33
$1,013.99
$978.63
$994.79
$973.44
+16.89
+1.74%
$1,295.59
2026-08-18
$929.50
$961.27
$898.68
$903.68
$994.79
-65.29
-6.56%
$1,210.56
2026-08-19
$911.40
$915.16
$829.11
$832.56
$903.68
+7.72
+0.85%
$1,220.90
2026-08-20
$833.68
$869.71
$827.60
$850.24
$832.56
+1.12
+0.13%
$1,222.54
2026-08-21
$862.63
$869.99
$834.50
$850.00
$850.24
+12.39
+1.46%
$1,240.37
2026-08-24
$818.60
$822.74
$774.00
$794.65
$850.00
-31.40
-3.69%
$1,194.54
2026-08-25
$814.50
$826.00
$800.12
$821.67
$794.65
+19.85
+2.50%
$1,224.38
2026-08-26
$825.60
$851.69
$821.67
$846.37
$821.67
+3.93
+0.48%
$1,230.23
2026-08-27
$875.75
$875.75
$812.94
$847.20
$846.37
+29.38
+3.47%
$1,272.94
2026-08-28
$831.09
$855.58
$825.50
$829.76
$847.20
-16.11
-1.90%
$1,248.73
2026-08-31
$826.50
$830.68
$808.49
$828.38
$829.76
-3.26
-0.39%
$1,243.83
2026-09-01
$810.25
$832.76
$802.11
$816.64
$828.38
-18.12
-2.19%
$1,216.61
2026-09-02
$805.86
$835.40
$785.66
$808.54
$816.64
-10.78
-1.32%
$1,200.55
2026-09-03
$796.00
$807.03
$763.55
$798.61
$808.54
-12.54
-1.55%
$1,181.93
2026-09-04
$818.75
$852.98
$805.01
$849.28
$798.61
+20.14
+2.52%
$1,211.74
2026-09-08
$880.65
$925.44
$860.01
$904.38
$849.28
+31.37
+3.69%
$1,256.50
2026-09-09
$893.14
$917.38
$885.39
$885.92
$904.38
-11.24
-1.24%
$1,240.88
2026-09-10
$860.56
$880.97
$848.24
$862.33
$885.92
-25.36
-2.86%
$1,205.36
2026-09-11
$869.42
$870.68
$817.68
$830.17
$862.33
+7.09
+0.82%
$1,215.27
📈 Overnight % Gain Trend
Cumulative overnight-only return, indexed to 0% on 2026-06-08
(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 %
2026-06
$876.77
$1,162.34
+285.57
+32.57%
2026-07
$1,162.34
$1,251.86
+89.52
+7.70%
2026-08
$1,251.86
$1,243.83
-8.03
-0.64%
2026-09
$1,243.83
$1,215.27
-28.56
-2.30%
🌙 Overnight vs. Intraday Return
Overnight (close→next open) Intraday (open→close)
From 2016-01-04 to 2026-09-04 (2,676 trading days), $1 invested
overnight-only would now be worth $4.70;
$1 invested intraday-only would be worth $7.95.
STX's historical return has leaned mostly on the regular trading session (intraday).
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 STX, with buy/sell triggers plotted right on the chart.