- Ameren Illinois Company issued and sold **$350,000,000** principal amount of its **5.625% First Mortgage Bonds due 2055** on **September 26, 2025**.  **[1002910_0001104659-25-093779_tm2526883d1_ex5-2.htm:0]** **[18654_0001104659-25-093779_tm2526883d1_ex5-1.htm:1]** **[1002910_0001104659-25-093779_tm2526883d1_ex5-1.htm:1]** **[18654_0001104659-25-093779_tm2526883d1_ex1-1.htm:33]** **[1002910_0001104659-25-093779_tm2526883d1_ex1-1.htm:33]** **[1002910_0001104659-25-093779_tm2526883d1_ex1-1.htm:34]** **[18654_0001104659-25-093779_tm2526883d1_ex1-1.htm:34]** **[18654_0001104659-25-093779_tm2526883d1_ex1-1.htm:35]** **[1002910_0001104659-25-093779_tm2526883d1_ex1-1.htm:35]** 
- The offering price for these bonds was **103.196%** of the principal amount, plus accrued interest.  **[18654_0001104659-25-093779_tm2526883d1_ex1-1.htm:33]** **[1002910_0001104659-25-093779_tm2526883d1_ex1-1.htm:33]** **[1002910_0001104659-25-093779_tm2526883d1_ex1-1.htm:34]** **[18654_0001104659-25-093779_tm2526883d1_ex1-1.htm:34]** 
- This offering is a **qualified reopening** of the 5.625% First Mortgage Bonds due 2055 that were originally issued on March 3, 2025.  **[18654_0001104659-25-093779_tm2526883d1_ex1-1.htm:35]** **[1002910_0001104659-25-093779_tm2526883d1_ex1-1.htm:35]**

Ameren Illinois (AILIH)