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Ameren Illinois Co (AILLO) stock

AILLOOTCElectric & Other Services CombinedFiscal year ends December 31Also trades as AILIH, AILIM, AILIN, AILIO, AILIP, AILLI, AILLM, AILLN, AILLP
Last filing: 10-Q on Aug 3, 2026
$65.25+0.00 (0.00%)

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

Price history

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

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Close, Oct 19, 2026
$65.25
0.00% on the day
52-week range
$65.25 – $72.00
-9.4% from the high
Change over 52 weeks
-6.3%
From $69.65 on Oct 17, 2025
Average volume
26
Shares a day, last 90 sessions
DateOpenHighLowCloseChangeVolume
Oct 19, 2026$65.25$65.25$65.25$65.250.00%0
Oct 16, 2026$65.25$65.25$65.25$65.250.00%0
Oct 15, 2026$65.25$65.25$65.25$65.250.00%0
Oct 14, 2026$65.25$65.25$65.25$65.250.00%0
Oct 13, 2026$65.25$65.25$65.25$65.25-0.00%0
Oct 12, 2026$65.25$65.25$65.25$65.25-1.95%100
Oct 9, 2026$66.55$66.55$66.55$66.550.00%0
Oct 8, 2026$66.55$66.55$66.55$66.55-1.41%405
Oct 7, 2026$67.50$67.50$67.50$67.50+1.43%100
Oct 6, 2026$66.55$66.55$66.55$66.550.00%0
Oct 5, 2026$66.55$66.55$66.55$66.550.00%0
Oct 2, 2026$66.55$66.55$66.55$66.550.00%0
Oct 1, 2026$66.55$66.55$66.55$66.550.00%0
Sep 30, 2026$67.25$67.25$66.55$66.55-1.19%506
Sep 29, 2026$67.35$67.35$67.35$67.350.00%410
Sep 28, 2026$67.35$67.35$67.35$67.350.00%0
Sep 25, 2026$67.35$67.35$67.35$67.350.00%0
Sep 24, 2026$67.35$67.35$67.35$67.350.00%0
Sep 23, 2026$67.35$67.35$67.35$67.350.00%0
Sep 22, 2026$67.35$67.35$67.35$67.350.00%0
Sep 21, 2026$67.35$67.35$67.35$67.350.00%0
Sep 18, 2026$67.35$67.35$67.35$67.350.00%0
Sep 17, 2026$67.35$67.35$67.35$67.350.00%0
Sep 16, 2026$67.35$67.35$67.35$67.350.00%0
Sep 15, 2026$67.35$67.35$67.35$67.350.00%0
Sep 14, 2026$67.35$67.35$67.35$67.350.00%0
Sep 11, 2026$67.35$67.35$67.35$67.350.00%0
Sep 10, 2026$67.35$67.35$67.35$67.350.00%175
Sep 9, 2026$67.35$67.35$67.35$67.350.00%0
Sep 8, 2026$67.35$67.35$67.35$67.350.00%0

Seasonality

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

YearJanFebMarAprMayJunJulAugSepOctNovDec
Average2.1%-1.3%-0.0%0.2%0.1%0.1%1.7%-1.1%0.8%-0.9%-0.6%0.4%
Months up7 of 102 of 101 of 105 of 105 of 102 of 109 of 101 of 103 of 106 of 104 of 92 of 9
20260.3%2.2%-0.9%0.8%-0.9%0.0%1.4%-1.1%-1.4%-0.4%
20252.6%0.4%0.0%-0.9%-2.3%1.6%1.7%-0.4%3.0%3.4%-1.4%-0.7%
20241.9%-2.1%1.6%-1.2%1.1%-1.3%7.3%-2.3%6.4%-1.7%-4.0%0.6%
202311.6%0.0%-0.3%-0.2%-1.2%0.0%1.3%-5.0%0.0%-13.1%0.8%5.7%
2022-1.0%-2.1%0.0%-2.1%-1.1%0.0%-1.0%0.0%-2.2%0.7%-13.3%0.0%
20210.0%0.0%-0.8%1.1%-0.5%0.0%1.1%1.3%-1.8%1.1%0.0%0.0%
20201.1%-2.5%0.0%1.1%1.9%0.0%1.1%0.0%0.0%1.6%1.9%-1.9%
20191.1%-8.9%0.0%5.6%1.1%0.0%1.1%0.0%4.2%1.1%0.0%0.0%
20184.2%0.0%0.0%-3.9%2.1%0.8%1.1%-3.3%0.0%1.7%5.3%0.0%
2017-0.3%0.0%0.0%2.1%1.1%-0.3%1.7%0.0%0.0%-3.1%5.1%0.0%