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Ameren Illinois Co (AILLN) stock

AILLNOTCElectric & Other Services CombinedFiscal year ends December 31Also trades as AILIH, AILIM, AILIN, AILIO, AILIP, AILLI, AILLM, AILLO, AILLP
Last filing: 10-Q on Aug 3, 2026
$75.00+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
$75.00
0.00% on the day
52-week range
$75.00 – $81.21
-7.6% from the high
Change over 52 weeks
-4.8%
From $78.77 on Oct 17, 2025
Average volume
83
Shares a day, last 90 sessions
Week ofOpenHighLowCloseChangeVolume
Oct 19, 2026$75.00$75.00$75.00$75.000.00%0
Oct 12, 2026$76.49$76.49$75.00$75.00-1.95%105
Oct 5, 2026$77.05$77.05$76.49$76.49-0.73%100
Sep 28, 2026$77.05$77.05$77.05$77.050.00%250
Sep 21, 2026$77.07$77.07$77.05$77.05-0.03%700
Sep 14, 2026$77.07$77.07$77.07$77.070.00%0
Sep 8, 2026$77.07$77.07$77.07$77.070.00%0
Aug 31, 2026$77.04$77.07$77.04$77.07+0.04%100
Aug 24, 2026$77.66$77.66$77.04$77.04-0.80%100
Aug 17, 2026$77.66$77.66$77.66$77.660.00%0
Aug 10, 2026$77.81$77.81$77.66$77.66-0.46%451
Aug 3, 2026$77.96$78.02$77.96$78.02+0.08%240
Jul 27, 2026$77.96$77.96$77.96$77.960.00%0
Jul 20, 2026$78.04$78.04$77.86$77.96-0.11%450
Jul 13, 2026$78.25$78.30$78.04$78.04-0.26%352
Jul 6, 2026$78.99$78.99$77.95$78.25-0.24%3,430
Jun 29, 2026$78.44$78.44$78.44$78.440.00%0
Jun 22, 2026$78.44$78.44$78.44$78.440.00%225
Jun 15, 2026$79.75$79.75$78.44$78.44-0.01%770
Jun 8, 2026$78.45$79.65$78.45$78.450.00%220
Jun 1, 2026$78.45$78.45$78.45$78.450.00%0
May 26, 2026$79.01$79.65$78.25$78.45-0.70%2,448
May 18, 2026$79.00$79.00$79.00$79.000.00%0
May 11, 2026$79.00$79.00$79.00$79.000.00%0
May 4, 2026$79.10$79.10$79.00$79.00-0.13%897
Apr 27, 2026$79.10$79.10$79.10$79.10+0.13%501
Apr 20, 2026$79.00$79.00$79.00$79.000.00%100
Apr 13, 2026$79.60$79.60$79.00$79.00-0.75%290
Apr 6, 2026$79.60$79.60$79.60$79.600.00%0
Mar 30, 2026$79.60$79.60$79.60$79.60+0.05%205
Mar 23, 2026$80.00$80.10$79.56$79.56-0.55%310
Mar 16, 2026$79.60$80.00$79.60$80.00+0.50%400
Mar 9, 2026$79.60$79.60$79.60$79.600.00%0
Mar 2, 2026$79.60$79.60$79.60$79.600.00%0
Feb 23, 2026$79.43$79.60$79.43$79.60+0.21%310
Feb 17, 2026$79.22$79.43$79.22$79.43+0.27%300
Feb 9, 2026$79.22$79.22$79.22$79.220.00%0
Feb 2, 2026$78.85$79.22$78.85$79.22+0.47%100
Jan 26, 2026$78.75$78.85$78.75$78.85-1.44%285
Jan 20, 2026$80.00$80.00$80.00$80.000.00%0
Jan 12, 2026$80.00$80.00$80.00$80.000.00%0
Jan 5, 2026$78.90$80.00$78.90$80.00+1.46%200
Dec 29, 2025$78.85$78.85$78.85$78.850.00%0
Dec 22, 2025$78.85$78.85$78.85$78.85-2.91%132
Dec 15, 2025$81.21$81.21$81.21$81.210.00%0
Dec 8, 2025$81.21$81.21$81.21$81.210.00%0
Dec 1, 2025$79.25$81.21$79.25$81.21+2.80%260
Nov 24, 2025$79.00$79.00$79.00$79.000.00%0
Nov 17, 2025$81.00$81.00$79.00$79.00-2.47%100
Nov 10, 2025$80.99$81.00$80.99$81.00+0.01%200
Nov 3, 2025$79.00$80.99$79.00$80.99+2.52%200
Oct 27, 2025$78.55$79.00$78.55$79.00+0.57%300

Seasonality

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

YearJanFebMarAprMayJunJulAugSepOctNovDec
Average1.8%0.1%-0.8%0.8%2.2%-1.7%1.6%-0.8%0.9%0.1%0.1%-1.2%
Months up9 of 104 of 102 of 107 of 103 of 103 of 108 of 104 of 107 of 106 of 101 of 93 of 9
20261.6%1.0%0.0%0.9%-0.8%-0.0%1.0%-1.2%0.0%-1.1%
20254.9%0.9%-0.3%-1.0%-1.7%-0.2%3.9%0.8%-0.1%1.7%0.0%-0.2%
20240.6%3.4%-2.7%-0.1%-0.6%1.3%5.7%-2.4%2.8%1.1%-0.1%-6.0%
2023-0.8%-3.3%2.2%1.4%-3.7%1.0%1.4%-7.9%-0.8%-4.5%-0.7%5.7%
20221.2%-1.8%-1.3%0.2%-3.3%6.0%-0.3%0.0%0.0%1.2%0.0%-6.0%
20211.2%0.0%-1.7%1.8%29.0%-21.4%-0.9%1.0%0.0%3.6%0.0%-2.5%
20202.7%0.0%-5.0%2.5%1.8%-0.9%1.2%0.0%2.1%1.2%0.0%0.2%
20191.2%0.0%0.4%1.2%0.0%-0.5%1.2%0.0%3.4%-2.7%2.5%0.0%
20184.3%0.7%-0.2%-0.0%1.7%-1.3%2.0%0.5%0.5%1.2%-1.1%0.1%
20171.2%0.0%0.0%1.2%0.0%-0.5%0.2%1.5%1.0%-0.3%0.0%-1.9%