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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 month, 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
MonthOpenHighLowCloseChangeVolume
Oct 2026$77.05$77.05$75.00$75.00-2.66%205
Sep 2026$77.04$77.07$77.04$77.05+0.01%1,050
Aug 2026$77.96$78.02$77.04$77.04-1.18%791
Jul 2026$78.44$78.99$77.86$77.96-0.61%4,232
Jun 2026$78.45$79.75$78.44$78.44-0.01%1,215
May 2026$79.10$79.65$78.25$78.45-0.82%3,345
Apr 2026$79.60$79.60$79.00$79.10-0.63%891
Mar 2026$79.60$80.10$79.56$79.600.00%915
Feb 2026$78.85$79.60$78.85$79.60+0.95%710
Jan 2026$78.85$80.00$78.75$78.850.00%485
Dec 2025$79.25$81.21$78.85$78.85-0.19%392
Nov 2025$79.00$81.00$79.00$79.000.00%500
Oct 2025$78.87$82.00$78.55$79.00+0.16%2,413
Sep 2025$78.93$81.75$76.90$78.87-0.07%2,843
Aug 2025$78.30$78.93$76.65$78.93+0.80%1,527
Jul 2025$76.55$78.30$76.55$78.30+2.29%1,143
Jun 2025$76.70$77.00$76.50$76.55-0.20%2,012
May 2025$78.00$78.01$65.00$76.70-1.67%5,029
Apr 2025$80.05$80.05$69.51$78.00-2.56%5,868
Mar 2025$80.26$80.26$78.97$80.05-0.26%6,437
Feb 2025$79.52$80.59$79.50$80.26+0.93%1,677
Jan 2025$77.00$79.78$77.00$79.52+3.27%1,226
Dec 2024$81.95$82.00$77.00$77.00-6.04%2,678
Nov 2024$83.25$83.25$81.27$81.95-0.06%1,617
Oct 2024$83.91$90.04$82.00$82.00-0.30%3,949
Sep 2024$80.50$82.30$80.50$82.25+2.81%1,557
Aug 2024$82.00$82.00$80.00$80.00-2.44%552
Jul 2024$78.80$82.00$78.80$82.00+4.06%605
Jun 2024$77.75$79.75$77.75$78.80+1.32%3,069
May 2024$78.25$78.25$77.77$77.77-0.61%1,331
Apr 2024$79.52$81.24$77.50$78.25-1.60%760
Mar 2024$81.75$81.75$79.52$79.52-2.73%225
Feb 2024$79.05$81.75$79.05$81.75+3.42%307
Jan 2024$79.75$81.70$78.50$79.05-0.88%8,005
Dec 2023$75.44$81.00$75.26$79.75+5.71%4,968
Nov 2023$76.00$76.00$73.00$75.44-0.73%6,249
Oct 2023$80.66$81.00$71.00$76.00-6.00%1,240
Sep 2023$81.50$84.00$80.85$80.85-0.80%1,357
Aug 2023$88.50$88.50$81.50$81.50-7.91%415
Jul 2023$88.50$88.50$88.50$88.500.00%0
Jun 2023$87.65$88.50$87.00$88.50+0.97%318
May 2023$91.00$91.00$87.65$87.65-3.68%2,970
Apr 2023$91.00$91.00$91.00$91.000.00%0
Mar 2023$89.00$91.00$87.00$91.00+2.25%650
Feb 2023$92.00$92.00$88.25$89.00-3.26%364
Jan 2023$94.00$94.00$90.00$92.00-2.13%918
Dec 2022$99.95$99.95$94.00$94.00-5.95%132
Nov 2022$99.95$99.95$99.95$99.950.00%0
Oct 2022$99.95$99.95$99.95$99.950.00%0
Sep 2022$99.95$99.95$99.95$99.950.00%0
Aug 2022$99.95$99.95$99.95$99.950.00%0
Jul 2022$101.45$101.45$98.25$99.95-1.48%982
Jun 2022$92.76$101.65$92.75$101.45+5.95%3,252
May 2022$99.00$99.00$94.00$95.75-3.28%947
Apr 2022$100.07$101.00$97.01$99.00-1.07%2,239
Mar 2022$101.37$101.37$100.07$100.07-1.28%100
Feb 2022$103.25$103.25$100.70$101.37-1.82%1,166
Jan 2022$103.25$103.25$103.25$103.250.00%110
Dec 2021$105.95$105.95$101.98$103.25-2.55%400
Nov 2021$105.95$105.95$105.95$105.950.00%0

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%