StockData
Ameren Illinois Co logo

Ameren Illinois Co (AILLM) stock

AILLMOTCElectric & Other Services CombinedFiscal year ends December 31Also trades as AILIH, AILIM, AILIN, AILIO, AILIP, AILLI, AILLN, AILLO, AILLP
Last filing: 10-Q on Aug 3, 2026
$76.00+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.

Download all as CSV
Close, Oct 19, 2026
$76.00
0.00% on the day
52-week range
$76.00 – $82.74
-8.1% from the high
Change over 52 weeks
-4.1%
From $79.27 on Oct 17, 2025
Average volume
9
Shares a day, last 90 sessions
MonthOpenHighLowCloseChangeVolume
Oct 2026$78.60$78.60$76.00$76.00-3.31%200
Sep 2026$78.60$78.60$78.60$78.600.00%0
Aug 2026$79.25$79.25$78.60$78.60-0.82%210
Jul 2026$78.75$79.25$78.72$79.25+0.63%426
Jun 2026$78.75$78.75$78.75$78.750.00%0
May 2026$79.75$79.76$78.75$78.75-1.25%685
Apr 2026$82.50$82.74$79.12$79.75-3.33%1,436
Mar 2026$79.75$82.50$79.35$82.50+3.45%2,107
Feb 2026$80.00$81.52$79.75$79.75+0.61%782
Jan 2026$79.27$79.27$79.27$79.270.00%100
Dec 2025$79.35$81.02$79.27$79.27-0.10%555
Nov 2025$79.50$82.00$79.35$79.35-0.19%1,603
Oct 2025$79.00$80.92$79.00$79.50+0.63%1,180
Sep 2025$80.55$82.00$70.02$79.00-1.92%2,702
Aug 2025$77.06$80.90$77.00$80.55+3.27%2,058
Jul 2025$78.00$80.23$78.00$78.000.00%1,704
Jun 2025$78.75$80.00$78.00$78.00-0.95%1,990
May 2025$78.00$79.00$78.00$78.75+0.96%1,620
Apr 2025$81.00$81.00$78.00$78.00-3.70%2,037
Mar 2025$81.00$81.00$81.00$81.000.00%150
Feb 2025$81.00$81.00$81.00$81.00+1.25%202
Jan 2025$78.00$81.00$78.00$80.00+2.56%972
Dec 2024$84.50$84.50$78.00$78.00-7.69%1,426
Nov 2024$86.00$86.00$84.50$84.50-1.74%350
Oct 2024$85.00$90.00$85.00$86.00+2.38%1,700
Sep 2024$79.00$84.00$79.00$84.00+6.33%1,100
Aug 2024$80.00$80.50$78.02$79.00-1.25%2,200
Jul 2024$78.75$80.01$78.56$80.00+1.59%800
Jun 2024$80.00$80.00$78.50$78.75-1.56%1,200
May 2024$79.50$80.00$76.25$80.00+0.63%600
Apr 2024$79.50$79.50$79.50$79.500.00%0
Mar 2024$79.50$79.50$79.50$79.500.00%100
Feb 2024$76.25$80.00$76.25$79.50+4.26%1,200
Jan 2024$76.25$76.25$76.25$76.250.00%0
Dec 2023$78.00$78.00$76.25$76.25-2.24%700
Nov 2023$80.00$80.00$78.00$78.00-2.50%100
Oct 2023$84.00$84.00$80.00$80.00-5.88%200
Sep 2023$86.75$86.75$85.00$85.00-2.02%300
Aug 2023$86.75$86.75$86.75$86.75-4.67%200
Jul 2023$91.00$91.00$91.00$91.000.00%0
Jun 2023$91.00$91.00$91.00$91.000.00%0
May 2023$91.00$91.00$88.05$91.000.00%500
Apr 2023$88.50$91.00$88.50$91.00+2.82%600
Mar 2023$91.00$91.00$88.50$88.50-2.75%500
Feb 2023$88.00$91.00$88.00$91.00+3.41%200
Jan 2023$85.10$89.00$85.00$88.00+3.41%1,800
Dec 2022$92.00$92.00$82.01$85.10-7.50%4,600
Nov 2022$92.00$92.00$92.00$92.000.00%0
Oct 2022$92.00$92.00$92.00$92.000.00%0
Sep 2022$92.00$92.00$92.00$92.000.00%0
Aug 2022$98.33$98.33$92.00$92.00-6.44%300
Jul 2022$92.65$98.33$91.43$98.33+6.13%200
Jun 2022$92.50$92.65$92.50$92.65+0.16%800
May 2022$99.32$99.32$92.50$92.50-6.87%100
Apr 2022$100.50$100.50$99.32$99.32-1.17%100
Mar 2022$99.01$100.50$99.01$100.50+1.50%300
Feb 2022$103.40$103.40$99.01$99.01-4.25%200
Jan 2022$103.55$103.55$103.40$103.40-0.14%100
Dec 2021$103.26$103.55$103.26$103.55+0.28%300
Nov 2021$103.26$103.26$103.26$103.260.00%0

Seasonality

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

YearJanFebMarAprMayJunJulAugSepOctNovDec
Average1.9%-0.5%0.1%1.4%-0.5%0.0%2.0%-0.4%0.3%0.3%-0.4%-1.9%
Months up10 of 104 of 103 of 107 of 105 of 102 of 109 of 105 of 102 of 106 of 101 of 92 of 9
20261.6%0.6%3.4%-1.9%-1.3%0.0%2.2%-0.8%0.0%-1.8%
20254.1%1.3%0.0%-2.2%1.0%-1.0%1.6%3.3%-1.9%2.2%-0.2%-0.1%
20241.6%4.3%0.0%1.6%0.6%-1.6%3.2%-1.2%6.3%3.8%-1.7%-7.7%
20234.9%3.4%-2.7%4.2%0.0%0.0%1.4%-4.7%-2.0%-4.4%-2.5%-2.2%
20221.1%-4.2%1.5%0.1%-6.9%0.2%7.6%-6.4%0.0%1.4%0.0%-7.5%
20211.1%-4.5%0.0%1.2%-1.0%0.0%1.2%0.2%0.0%1.2%0.0%0.3%
20201.2%0.0%-3.9%5.3%0.5%0.0%0.0%0.0%1.2%5.2%0.0%0.0%
20191.3%0.0%0.0%5.7%5.9%-1.7%1.2%2.5%-0.2%1.2%-0.7%0.5%
20181.2%0.0%0.0%-1.0%2.8%-3.4%0.2%1.0%0.0%-4.9%0.0%0.0%
20171.2%-5.4%3.1%1.2%-7.0%7.5%1.2%2.0%0.0%-0.8%2.0%0.0%