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Ameren Illinois Co (AILLM) stock

AILLMOTCElectric & Other Services CombinedFiscal year ends December 31Also trades as AILIH, AILIM, AILIN, AILIO, AILIP, AILLI, AILLN, AILLO, AILLP
Last filing: 10-Q on Aug 3, 2026
$76.00+0.00 (0.00%)

Close on Oct 19, 2026Market cap –P/E –Yield –

Price history

Ameren Illinois share prices for every week, newest first. Adjusted for stock splits, not for dividends.

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Close, Oct 19, 2026
$76.00
0.00% on the day
52-week range
$76.00 – $82.74
-8.1% from the high
Change over 52 weeks
-4.1%
From $79.27 on Oct 17, 2025
Average volume
9
Shares a day, last 90 sessions
Week ofOpenHighLowCloseChangeVolume
Oct 19, 2026$76.00$76.00$76.00$76.000.00%0
Oct 12, 2026$78.60$78.60$76.00$76.00-3.31%200
Oct 5, 2026$78.60$78.60$78.60$78.600.00%0
Sep 28, 2026$78.60$78.60$78.60$78.600.00%0
Sep 21, 2026$78.60$78.60$78.60$78.600.00%0
Sep 14, 2026$78.60$78.60$78.60$78.600.00%0
Sep 8, 2026$78.60$78.60$78.60$78.600.00%0
Aug 31, 2026$78.60$78.60$78.60$78.600.00%0
Aug 24, 2026$78.60$78.60$78.60$78.600.00%0
Aug 17, 2026$78.60$78.60$78.60$78.600.00%0
Aug 10, 2026$78.60$78.60$78.60$78.60-0.82%210
Aug 3, 2026$79.25$79.25$79.25$79.250.00%0
Jul 27, 2026$79.25$79.25$79.25$79.250.00%0
Jul 20, 2026$79.25$79.25$79.25$79.250.00%0
Jul 13, 2026$78.72$79.25$78.72$79.25+0.67%100
Jul 6, 2026$78.75$78.85$78.72$78.72-0.04%326
Jun 29, 2026$78.75$78.75$78.75$78.750.00%0
Jun 22, 2026$78.75$78.75$78.75$78.750.00%0
Jun 15, 2026$78.75$78.75$78.75$78.750.00%0
Jun 8, 2026$78.75$78.75$78.75$78.750.00%0
Jun 1, 2026$78.75$78.75$78.75$78.750.00%0
May 26, 2026$79.75$79.76$78.75$78.75-1.25%685
May 18, 2026$79.75$79.75$79.75$79.750.00%0
May 11, 2026$79.75$79.75$79.75$79.750.00%0
May 4, 2026$79.75$79.75$79.75$79.750.00%0
Apr 27, 2026$79.75$79.75$79.75$79.750.00%0
Apr 20, 2026$79.75$79.75$79.75$79.75+0.80%214
Apr 13, 2026$79.12$79.50$79.12$79.120.00%522
Apr 6, 2026$82.74$82.74$79.12$79.12-4.10%700
Mar 30, 2026$82.50$82.50$82.50$82.500.00%0
Mar 23, 2026$82.50$82.50$82.50$82.500.00%0
Mar 16, 2026$80.75$82.50$80.75$82.50+2.17%500
Mar 9, 2026$79.35$80.75$79.35$80.75+1.76%527
Mar 2, 2026$79.75$79.75$79.35$79.35-0.50%1,080
Feb 23, 2026$80.00$81.52$79.75$79.75-0.31%659
Feb 17, 2026$80.00$80.00$80.00$80.000.00%0
Feb 9, 2026$80.00$80.00$80.00$80.000.00%0
Feb 2, 2026$80.00$80.00$80.00$80.00+0.92%123
Jan 26, 2026$79.27$79.27$79.27$79.270.00%0
Jan 20, 2026$79.27$79.27$79.27$79.270.00%0
Jan 12, 2026$79.27$79.27$79.27$79.270.00%100
Jan 5, 2026$79.27$79.27$79.27$79.270.00%0
Dec 29, 2025$79.27$79.27$79.27$79.270.00%0
Dec 22, 2025$81.00$81.02$79.27$79.27-2.14%250
Dec 15, 2025$81.00$81.00$81.00$81.000.00%0
Dec 8, 2025$81.00$81.00$81.00$81.000.00%0
Dec 1, 2025$79.35$81.00$79.35$81.00+2.08%305
Nov 24, 2025$79.35$79.35$79.35$79.350.00%0
Nov 17, 2025$82.00$82.00$79.35$79.35-3.23%300
Nov 10, 2025$82.00$82.00$81.75$82.000.00%712
Nov 3, 2025$79.50$82.00$79.50$82.00+3.14%591
Oct 27, 2025$79.27$79.50$79.27$79.50+0.29%100

Seasonality

AILLM return in each calendar month over the last 10 years, including dividends. The current month runs to the latest close.

YearJanFebMarAprMayJunJulAugSepOctNovDec
Average1.9%-0.5%0.1%1.4%-0.5%0.0%2.0%-0.4%0.3%0.3%-0.4%-1.9%
Months up10 of 104 of 103 of 107 of 105 of 102 of 109 of 105 of 102 of 106 of 101 of 92 of 9
20261.6%0.6%3.4%-1.9%-1.3%0.0%2.2%-0.8%0.0%-1.8%
20254.1%1.3%0.0%-2.2%1.0%-1.0%1.6%3.3%-1.9%2.2%-0.2%-0.1%
20241.6%4.3%0.0%1.6%0.6%-1.6%3.2%-1.2%6.3%3.8%-1.7%-7.7%
20234.9%3.4%-2.7%4.2%0.0%0.0%1.4%-4.7%-2.0%-4.4%-2.5%-2.2%
20221.1%-4.2%1.5%0.1%-6.9%0.2%7.6%-6.4%0.0%1.4%0.0%-7.5%
20211.1%-4.5%0.0%1.2%-1.0%0.0%1.2%0.2%0.0%1.2%0.0%0.3%
20201.2%0.0%-3.9%5.3%0.5%0.0%0.0%0.0%1.2%5.2%0.0%0.0%
20191.3%0.0%0.0%5.7%5.9%-1.7%1.2%2.5%-0.2%1.2%-0.7%0.5%
20181.2%0.0%0.0%-1.0%2.8%-3.4%0.2%1.0%0.0%-4.9%0.0%0.0%
20171.2%-5.4%3.1%1.2%-7.0%7.5%1.2%2.0%0.0%-0.8%2.0%0.0%