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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 week, 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
Week ofOpenHighLowCloseChangeVolume
Oct 19, 2026$66.00$66.00$66.00$66.000.00%0
Oct 12, 2026$65.90$66.00$65.40$66.00+0.15%500
Oct 5, 2026$65.90$65.90$65.90$65.900.00%0
Sep 28, 2026$72.00$72.00$65.90$65.90-8.47%210
Sep 21, 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 8, 2026$72.00$72.00$72.00$72.000.00%0
Aug 31, 2026$72.00$72.00$72.00$72.000.00%0
Aug 24, 2026$70.89$72.00$70.89$72.00+1.57%100
Aug 17, 2026$70.89$70.89$70.89$70.890.00%0
Aug 10, 2026$70.89$70.89$70.89$70.890.00%0
Aug 3, 2026$70.89$70.89$70.89$70.890.00%0
Jul 27, 2026$70.89$70.89$70.89$70.890.00%0
Jul 20, 2026$70.89$70.89$70.89$70.890.00%0
Jul 13, 2026$70.89$70.89$70.89$70.890.00%0
Jul 6, 2026$70.89$70.89$70.89$70.890.00%0
Jun 29, 2026$70.89$70.89$70.89$70.890.00%0
Jun 22, 2026$70.89$70.89$70.89$70.890.00%100
Jun 15, 2026$70.89$70.89$70.89$70.890.00%0
Jun 8, 2026$70.89$70.89$70.89$70.890.00%0
Jun 1, 2026$70.89$70.89$70.89$70.890.00%0
May 26, 2026$70.89$70.89$70.89$70.890.00%0
May 18, 2026$70.89$70.89$70.89$70.890.00%0
May 11, 2026$70.89$70.89$70.89$70.89+0.55%100
May 4, 2026$66.03$70.50$66.03$70.50-0.56%351
Apr 27, 2026$71.69$72.00$70.90$70.90-1.10%201
Apr 20, 2026$71.69$71.69$71.69$71.690.00%0
Apr 13, 2026$71.69$71.69$71.69$71.690.00%0
Apr 6, 2026$71.69$71.69$71.69$71.690.00%0
Mar 30, 2026$71.69$71.69$71.69$71.690.00%0
Mar 23, 2026$71.69$71.69$71.69$71.690.00%0
Mar 16, 2026$69.90$71.69$69.90$71.69+2.57%120
Mar 9, 2026$69.90$69.90$69.90$69.900.00%0
Mar 2, 2026$69.90$69.90$69.90$69.900.00%0
Feb 23, 2026$69.90$69.90$69.90$69.900.00%0
Feb 17, 2026$71.00$71.00$69.10$69.90-1.56%500
Feb 9, 2026$71.00$71.00$71.00$71.000.00%200
Feb 2, 2026$69.10$71.00$69.10$71.00+2.75%200
Jan 26, 2026$68.30$69.10$68.30$69.10+1.17%150
Jan 20, 2026$68.30$68.30$68.30$68.300.00%0
Jan 12, 2026$68.30$68.30$68.30$68.300.00%0
Jan 5, 2026$70.00$70.00$68.30$68.30-2.43%108
Dec 29, 2025$70.00$70.00$70.00$70.000.00%0
Dec 22, 2025$70.00$70.00$70.00$70.000.00%200
Dec 15, 2025$70.00$70.00$70.00$70.000.00%0
Dec 8, 2025$71.75$71.75$70.00$70.00-2.44%100
Dec 1, 2025$73.00$73.00$71.75$71.75-1.71%135
Nov 24, 2025$73.00$73.00$73.00$73.000.00%0
Nov 17, 2025$73.00$73.00$73.00$73.000.00%0
Nov 10, 2025$73.00$73.00$73.00$73.000.00%0
Nov 3, 2025$73.00$73.00$73.00$73.000.00%0
Oct 27, 2025$68.00$73.00$68.00$73.00+5.80%515

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%