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Ameren Illinois Co (AILIO) stock

AILIOOTCElectric & Other Services CombinedFiscal year ends December 31Also trades as AILIH, AILIM, AILIN, AILIP, AILLI, AILLM, AILLN, AILLO, AILLP
Last filing: 10-Q on Aug 3, 2026
$66.00+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
$66.00
0.00% on the day
52-week range
$65.40 – $73.00
-9.6% from the high
Change over 52 weeks
-2.9%
From $68.00 on Oct 17, 2025
Average volume
10
Shares a day, last 90 sessions
DateOpenHighLowCloseChangeVolume
Oct 19, 2026$66.00$66.00$66.00$66.000.00%0
Oct 16, 2026$66.00$66.00$66.00$66.000.00%0
Oct 15, 2026$66.00$66.00$66.00$66.000.00%0
Oct 14, 2026$66.00$66.00$66.00$66.000.00%100
Oct 13, 2026$66.00$66.00$65.40$66.00+0.15%400
Oct 12, 2026$65.90$65.90$65.90$65.900.00%0
Oct 9, 2026$65.90$65.90$65.90$65.900.00%0
Oct 8, 2026$65.90$65.90$65.90$65.900.00%0
Oct 7, 2026$65.90$65.90$65.90$65.900.00%0
Oct 6, 2026$65.90$65.90$65.90$65.900.00%0
Oct 5, 2026$65.90$65.90$65.90$65.900.00%0
Oct 2, 2026$65.90$65.90$65.90$65.900.00%0
Oct 1, 2026$65.90$65.90$65.90$65.900.00%0
Sep 30, 2026$65.90$65.90$65.90$65.900.00%0
Sep 29, 2026$65.90$65.90$65.90$65.90-8.47%210
Sep 28, 2026$72.00$72.00$72.00$72.000.00%0
Sep 25, 2026$72.00$72.00$72.00$72.000.00%0
Sep 24, 2026$72.00$72.00$72.00$72.000.00%0
Sep 23, 2026$72.00$72.00$72.00$72.000.00%0
Sep 22, 2026$72.00$72.00$72.00$72.000.00%0
Sep 21, 2026$72.00$72.00$72.00$72.000.00%0
Sep 18, 2026$72.00$72.00$72.00$72.000.00%0
Sep 17, 2026$72.00$72.00$72.00$72.000.00%0
Sep 16, 2026$72.00$72.00$72.00$72.000.00%0
Sep 15, 2026$72.00$72.00$72.00$72.000.00%0
Sep 14, 2026$72.00$72.00$72.00$72.000.00%0
Sep 11, 2026$72.00$72.00$72.00$72.000.00%0
Sep 10, 2026$72.00$72.00$72.00$72.000.00%0
Sep 9, 2026$72.00$72.00$72.00$72.000.00%0
Sep 8, 2026$72.00$72.00$72.00$72.000.00%0

Seasonality

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

YearJanFebMarAprMayJunJulAugSepOctNovDec
Average2.2%-0.1%1.1%-2.3%1.7%-0.6%1.4%-0.5%0.4%0.2%-0.2%-1.6%
Months up9 of 102 of 102 of 105 of 105 of 102 of 109 of 102 of 104 of 109 of 102 of 92 of 9
20260.3%1.2%2.6%0.4%-0.0%0.0%1.5%1.6%-8.5%1.8%
20251.5%-2.1%-0.1%-1.0%4.5%-1.4%1.5%-4.3%1.5%9.1%0.0%-4.1%
20248.4%0.0%0.0%1.5%0.0%-4.2%3.4%0.7%2.4%4.8%-3.7%0.4%
20231.4%0.0%10.4%-9.8%4.6%1.9%1.3%0.0%0.0%-20.4%4.4%1.2%
20221.1%-2.1%-1.0%-8.4%1.2%0.0%1.2%0.0%0.0%1.2%0.0%-11.5%
20212.6%0.0%0.0%-7.4%5.4%-2.2%5.9%-3.4%0.5%1.1%0.6%0.0%
20203.2%0.0%-0.3%1.1%-0.5%0.2%1.1%0.0%0.0%1.1%0.0%0.0%
20191.1%2.1%0.0%1.1%0.0%0.0%-5.5%0.0%9.9%1.1%-1.5%0.0%
2018-1.1%0.0%-0.6%4.8%0.0%0.0%1.1%0.0%-2.1%1.1%-2.0%0.0%
20173.6%0.0%0.0%-5.8%1.7%0.0%2.6%0.0%0.0%1.1%0.0%0.0%