S-3 S-3ASR EX-FILING FEES 0001002910 AMEREN CORP N/A N/A 0001002910 2026-08-04 2026-08-04 0001002910 1 2026-08-04 2026-08-04 0001002910 2 2026-08-04 2026-08-04 0001002910 3 2026-08-04 2026-08-04 0001002910 4 2026-08-04 2026-08-04 0001002910 5 2026-08-04 2026-08-04 0001002910 6 2026-08-04 2026-08-04 0001002910 7 2026-08-04 2026-08-04 0001002910 8 2026-08-04 2026-08-04 0001002910 9 2026-08-04 2026-08-04 0001002910 10 2026-08-04 2026-08-04 0001002910 11 2026-08-04 2026-08-04 0001002910 12 2026-08-04 2026-08-04 0001002910 13 2026-08-04 2026-08-04 0001002910 14 2026-08-04 2026-08-04 0001002910 15 2026-08-04 2026-08-04 iso4217:USD xbrli:pure xbrli:shares

Calculation of Filing Fee Tables

S-3

AMEREN CORP

Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable

Security Type

Security Class Title

Fee Calculation or Carry Forward Rule

Amount Registered

Proposed Maximum Offering Price Per Unit

Maximum Aggregate Offering Price

Fee Rate

Amount of Registration Fee

Carry Forward Form Type

Carry Forward File Number

Carry Forward Initial Effective Date

Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward

Newly Registered Securities
Fees to be Paid 1 Debt Ameren Corporation Senior Debt Securities 457(r) 0.0001381
Fees to be Paid 2 Debt Ameren Corporation Subordinated Debt Securities 457(r) 0.0001381
Fees to be Paid 3 Equity Ameren Corporation Common Stock, $.01 par value 457(r) 0.0001381
Fees to be Paid 4 Equity Ameren Corporation Preferred Stock 457(r) 0.0001381
Fees to be Paid 5 Other Ameren Corporation Stock Purchase Contracts 457(r) 0.0001381
Fees to be Paid 6 Other Ameren Corporation Stock Purchase Units 457(r) 0.0001381
Fees to be Paid 7 Debt Union Electric Company Senior Secured Debt Securities 457(r) 0.0001381
Fees to be Paid 8 Debt Union Electric Company First Mortgage Bonds 457(r) 0.0001381
Fees to be Paid 9 Debt Union Electric Company Senior Unsecured Debt Securities 457(r) 0.0001381
Fees to be Paid 10 Equity Union Electric Company Preferred Stock 457(r) 0.0001381
Fees to be Paid 11 Debt Ameren Illinois Company Senior Secured Debt Securities 457(r) 0.0001381
Fees to be Paid 12 Debt Ameren Illinois Company First Mortgage Bonds 457(r) 0.0001381
Fees to be Paid 13 Debt Ameren Illinois Company Senior Unsecured Debt Securities 457(r) 0.0001381
Fees to be Paid 14 Equity Ameren Illinois Company Preferred Stock 457(r) 0.0001381
Fees Previously Paid
Carry Forward Securities
Carry Forward Securities 15 Equity Ameren Corporation Common Stock, $.01 par value 415(a)(6) 266,700,000 $ 266,700,000.00 S-3 333-274977 10/13/2023 $ 40,831.77

Total Offering Amounts:

$ 266,700,000.00

$ 0.00

Total Fees Previously Paid:

$ 0.00

Total Fee Offsets:

$ 0.00

Net Fee Due:

$ 0.00

Offering Note

1

In addition to the shares of Ameren Corporation Common Stock, $.01 par value, having a gross sales price of up to $266,700,000 described in Note (15), an additional unspecified aggregate initial offering amount or number of the securities of each identified class is being registered as may from time to time be offered by Ameren Corporation, Union Electric Company and Ameren Illinois Company or sold by selling securityholders, if and as allowed, at unspecified prices, along with an indeterminate amount or number of securities that may be issued upon exercise, settlement, exchange or conversion of securities offered hereunder. In accordance with Rules 456(b) and 457(r) under the Securities Act of 1933, as amended (the "Securities Act"), the registrants are deferring payment of the registration fee in connection with such additional securities offered hereby, and the registrants will pay "pay as you go registration fees" in accordance with Rules 456(b) and 457(r) under the Securities Act with respect to those additional securities.

2

See Offering Note 1.

3

See Offering Note 1.

4

See Offering Note 1.

5

See Offering Note 1.

6

See Offering Note 1.

7

See Offering Note 1.

8

See Offering Note 1.

9

See Offering Note 1.

10

See Offering Note 1.

11

See Offering Note 1.

12

See Offering Note 1.

13

See Offering Note 1.

14

See Offering Note 1.

15

Pursuant to Rule 415(a)(6) under the Securities Act, there is included on this registration statement shares of Ameren Corporation Common Stock, $.01 par value, having a gross sales price of up to $266,700,000 that were previously registered for offer and sale, but not sold, in connection with Ameren Corporation's Equity Distribution Sales Agreement, dated May 12, 2021, as amended and supplemented, including by the First Amendment to Equity Distribution Sales Agreement, dated August 7, 2025 (as so amended and supplemented, the "Sales Agreement"), pursuant to a Rule 424(b)(5) filing made with the Securities and Exchange Commission (the "Commission") on August 7, 2025 under Registration Statement No. 333-274977 filed with the Commission on October 13, 2023 (the "Prior Registration Statement"), and for which a filing fee of $40,831.77 with respect to such unsold shares was paid in connection therewith. Pursuant to Rule 415(a)(6) under the Securities Act, the filing fee related to such unsold shares will continue to be applied to the offer and sale of such unsold shares pursuant to the Sales Agreement. Pursuant to Rule 415(a)(6) under the Securities Act, the offering of shares under the Prior Registration Statement will be deemed terminated as of the date of effectiveness of this registration statement.

Table 2: Fee Offset Claims and Sources ☑Not Applicable
Registrant or Filer Name Form or Filing Type File Number Initial Filing Date Filing Date Fee Offset Claimed Security Type Associated with Fee Offset Claimed Security Title Associated with Fee Offset Claimed Unsold Securities Associated with Fee Offset Claimed Unsold Aggregate Offering Amount Associated with Fee Offset Claimed Fee Paid with Fee Offset Source
Rules 457(b) and 0-11(a)(2)
Fee Offset Claims
Fee Offset Sources
Rule 457(p)
Fee Offset Claims
Fee Offset Sources
Table 3: Combined Prospectuses ☑Not Applicable

Security Type

Security Class Title

Amount of Securities Previously Registered

Maximum Aggregate Offering Price of Securities Previously Registered

Form Type

File Number

Initial Effective Date