StockData
Ameren Illinois Co logo

Ameren Illinois Co (AILLI) stock

AILLIOTCElectric & Other Services CombinedFiscal year ends December 31Also trades as AILIH, AILIM, AILIN, AILIO, AILIP, AILLM, AILLN, AILLO, AILLP
Last filing: 10-Q on Aug 3, 2026
$79.51+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.

Download all as CSV
Close, Oct 19, 2026
$79.51
0.00% on the day
52-week range
$79.51 – $92.00
-13.6% from the high
Change over 52 weeks
-7.5%
From $86.00 on Oct 17, 2025
Average volume
15
Shares a day, last 90 sessions
Week ofOpenHighLowCloseChangeVolume
Oct 19, 2026$79.51$79.51$79.51$79.510.00%0
Oct 12, 2026$81.00$81.00$79.51$79.51-1.84%100
Oct 5, 2026$81.00$81.00$81.00$81.000.00%0
Sep 28, 2026$81.00$81.00$81.00$81.000.00%0
Sep 21, 2026$81.00$81.00$81.00$81.000.00%0
Sep 14, 2026$81.00$81.00$81.00$81.000.00%0
Sep 8, 2026$81.00$81.00$81.00$81.000.00%244
Aug 31, 2026$81.00$81.00$81.00$81.000.00%0
Aug 24, 2026$81.00$81.00$81.00$81.000.00%0
Aug 17, 2026$81.76$81.76$81.00$81.00-3.57%245
Aug 10, 2026$84.00$84.00$84.00$84.000.00%0
Aug 3, 2026$84.00$84.00$84.00$84.000.00%0
Jul 27, 2026$84.00$84.00$84.00$84.000.00%0
Jul 20, 2026$84.00$84.00$84.00$84.000.00%0
Jul 13, 2026$83.40$84.00$83.40$84.00+0.72%100
Jul 6, 2026$83.40$83.40$83.40$83.400.00%0
Jun 29, 2026$83.50$83.50$83.40$83.40-0.12%100
Jun 22, 2026$83.00$83.50$83.00$83.50+0.60%400
Jun 15, 2026$83.00$83.00$83.00$83.000.00%120
Jun 8, 2026$83.00$83.00$83.00$83.000.00%0
Jun 1, 2026$83.50$83.50$82.80$83.00-0.60%650
May 26, 2026$85.60$85.60$83.50$83.50-2.45%487
May 18, 2026$85.60$85.60$85.60$85.60-0.47%100
May 11, 2026$86.00$86.00$86.00$86.000.00%0
May 4, 2026$85.00$86.00$85.00$86.00+2.99%263
Apr 27, 2026$84.75$84.75$83.50$83.50-2.91%570
Apr 20, 2026$87.00$87.00$86.00$86.00-1.15%100
Apr 13, 2026$87.00$87.00$87.00$87.000.00%0
Apr 6, 2026$87.00$87.00$87.00$87.000.00%0
Mar 30, 2026$87.00$87.00$87.00$87.000.00%0
Mar 23, 2026$87.00$87.00$87.00$87.000.00%0
Mar 16, 2026$87.00$87.00$87.00$87.000.00%0
Mar 9, 2026$87.00$87.00$87.00$87.000.00%0
Mar 2, 2026$87.00$87.00$87.00$87.000.00%0
Feb 23, 2026$87.00$87.00$87.00$87.000.00%121
Feb 17, 2026$87.00$87.00$87.00$87.000.00%0
Feb 9, 2026$87.00$87.00$87.00$87.000.00%100
Feb 2, 2026$87.00$87.00$86.00$87.000.00%200
Jan 26, 2026$84.00$87.00$84.00$87.00+3.57%100
Jan 20, 2026$84.00$84.00$84.00$84.000.00%0
Jan 12, 2026$92.00$92.00$84.00$84.00-8.70%145
Jan 5, 2026$92.00$92.00$92.00$92.000.00%0
Dec 29, 2025$92.00$92.00$92.00$92.000.00%0
Dec 22, 2025$92.00$92.00$92.00$92.000.00%0
Dec 15, 2025$85.00$92.00$85.00$92.00+8.24%200
Dec 8, 2025$85.00$85.00$85.00$85.000.00%0
Dec 1, 2025$84.00$85.00$84.00$85.00+1.19%100
Nov 24, 2025$84.00$84.00$84.00$84.000.00%0
Nov 17, 2025$84.00$84.00$84.00$84.000.00%0
Nov 10, 2025$84.00$84.00$84.00$84.000.00%0
Nov 3, 2025$84.00$84.00$84.00$84.000.00%0
Oct 27, 2025$86.00$86.00$84.00$84.00-2.33%225

Seasonality

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

YearJanFebMarAprMayJunJulAugSepOctNovDec
Average-0.3%-0.4%0.6%0.9%-0.2%0.2%-0.7%1.3%0.3%1.6%0.4%-0.4%
Months up6 of 102 of 102 of 107 of 102 of 102 of 107 of 103 of 103 of 107 of 103 of 93 of 9
2026-4.1%0.0%0.0%-2.6%0.0%-0.1%2.3%-3.6%0.0%-0.3%
20252.7%-1.1%0.0%1.5%-1.2%0.9%-1.5%1.2%1.8%-0.5%0.0%9.5%
20241.6%-0.6%0.6%-0.2%1.2%-1.2%1.6%0.0%4.8%1.1%2.6%-3.4%
2023-1.7%-1.0%0.0%1.4%0.0%0.0%0.3%0.0%0.0%-4.0%1.1%-7.1%
2022-0.7%1.5%-0.5%1.3%0.0%0.0%-11.5%14.2%-2.5%6.2%-0.0%-4.7%
2021-5.7%1.5%0.0%5.1%-3.2%0.0%1.7%0.0%-1.4%2.2%-0.5%0.0%
20201.3%0.0%5.8%-1.4%0.8%0.0%1.3%0.0%0.0%8.3%0.0%0.0%
20191.3%-3.6%0.0%1.3%0.0%0.0%1.4%0.0%0.0%1.3%0.0%0.0%
20181.3%-1.0%0.0%1.3%-0.0%0.0%1.3%0.9%0.0%0.8%0.2%0.5%
20171.3%0.0%0.0%1.3%0.0%1.9%-3.6%0.0%0.0%1.3%0.0%2.0%