Item 16. FORM 10-K SUMMARY

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Item 16. FORM 10-K SUMMARY

The Ameren Companies elected not to provide a summary of the Form 10-K.

EXHIBIT INDEX

The documents listed below are being filed or have previously been filed on behalf of the Ameren Companies and are incorporated herein by reference from the documents indicated and made a part hereof. Exhibits not identified as previously filed are filed herewith:


Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
Articles of Incorporation/ By-Laws
3.1(i)	Ameren	Restated Articles of Incorporation of Ameren	Annex F to Part I of the Registration Statement on Form S-4, File No. 33-64165
3.2(i)	Ameren	Certificate of Amendment to Ameren’s Restated Articles of Incorporation filed December 14, 1998	1998 Form 10-K, Exhibit 3(i), File No. 1-14756
3.3(i)	Ameren	Certificate of Amendment to Ameren’s Restated Articles of Incorporation filed April 21, 2011	April 21, 2011 Form 8-K, Exhibit 3(i), File No. 1-14756
3.4(i)	Ameren	Certificate of Amendment to Ameren’s Restated Articles of Incorporation filed December 18, 2012	December 18, 2012 Form 8-K, Exhibit 3.1(i), File No. 1-14756
3.5(i)	Ameren Missouri	Restated Articles of Incorporation of Ameren Missouri	1993 Form 10-K, Exhibit 3(i), File No. 1-2967
3.6(i)	Ameren Illinois	Restated Articles of Incorporation of Ameren Illinois	2010 Form 10-K, Exhibit 3.4(i), File No. 1-3672
3.7(ii)	Ameren	By-Laws of Ameren, as amended October 8, 2021	October 12, 2021 Form 8-K, Exhibit 3.1, File No. 1-14756
3.8(ii)	Ameren Missouri	Bylaws of Ameren Missouri, as amended February 19, 2021	2020 Form 10-K, Exhibit 3.8(ii), File No. 1-2967
3.9(ii)	Ameren Illinois	Bylaws of Ameren Illinois, as amended February 19, 2021	2020 Form 10-K, Exhibit 3.9(ii), File No. 1-3672
Instruments Defining Rights of Security Holders, Including Indentures
4.1	Ameren	Indenture, dated as of December 1, 2001 from Ameren to The Bank of New York Mellon Trust Company, N.A., as successor trustee, relating to senior debt securities (Ameren Indenture)	Exhibit 4.5, File No. 333-81774
4.2	Ameren	First Supplemental Indenture to Ameren Senior Indenture dated as of May 19, 2008	June 30, 2008 Form 10-Q, Exhibit 4.1, File No. 1-14756
4.3	Ameren	Ameren Indenture Company Order, dated November 24, 2015, establishing the 3.65% Senior Notes due 2026 (including the global note)	November 24, 2015 Form 8-K, Exhibits 4.3 and 4.5, File No. 1-14756
4.4	Ameren	Ameren Indenture Company Order, dated September 16, 2019, establishing the 2.50% Senior Notes due 2024 (including the gl l obal note)	September 16, 2019 Form 8-K, Exhibits 4.3 and 4.4, File No. 1-14756
4.5	Ameren	Ameren Indenture Company Order, dated April 3, 2020, establishing the 3.50% Senior Notes due 2031 (including the g lobal note)	April 3, 2020 Form 8-K, Exhibits 4.3 and 4.4, File No. 1-14756
4.6	Ameren	Ameren Indenture Company Order, dated March 5, 2021, establishing the 1.75% Senior Notes due 2028 (including the global note)	March 5, 2021 Form 8-K, Exhibits 4.3 and 4.4, File No. 1-14756
4.7	Ameren	Ameren Indenture Company Order, dated November 18, 2021, establishing the 1.95% Senior Notes due 2027 (including the global note)	November 18, 2021 Form 8-K, Exhibits 4.3 and 4.4, File No. 1-14756
4.8	Ameren	Ameren Indenture Company Order, dated November 20, 2023, establishing the 5.70% Senior Notes due 2026 (including the global note)	November 20, 2023 Form 8-K, Exhibits 4.3 and 4.4, File No. 1-14756
4.9	Ameren	Ameren Indenture Company Order, dated December 21, 2023, establishing the 5.00% Senior Notes due 2029 (including the global note)	December 21, 2023 Form 8-K, Exhibits 4.3 and 4.4, File No. 1-14756
4.10	Ameren	Note Purchase Agreement, dated June 22, 2017, between Ameren Transmission Company of Illinois and the several purchasers named therein.	June 26, 2017 Form 8-K, Exhibit 4.1, File No. 1-14756
4.11	Ameren	Note Purchase Agreement, dated as of November 16, 2021, between Ameren Transmission Company of Illinois and the several purchasers named therein.	2021 Form 10-K, Exhibit 4.9, File No. 1-14756
4.12	Ameren Ameren Missouri	Indenture of Mortgage and Deed of Trust, dated June 15, 1937 (Ameren Missouri Mortgage), from Ameren Missouri to The Bank of New York Mellon, as successor trustee, as amended May 1, 1941, and Second Supplemental Indenture dated May 1, 1941	Exhibit B-1, File No. 2-4940
4.13	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated as of July 1, 1956	Exhibit 4.22, File No. 333-222108
4.14	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated as of April 1, 1971	Exhibit 4.23, File No. 333-222108
4.15	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated as of February 1, 1974	Exhibit 4.24, File No. 333-222108
4.16	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated as of July 7, 1980	Exhibit 4.25, File No. 333-222108
4.17	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated as of October 1, 1993	1993 Form 10-K, Exhibit 4.8, File No. 1-2967
4.18	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated as of February 1, 2000	2000 Form 10-K, Exhibit 99, File No. 1-2967

Table of Conten t s


Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
4.19	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated August 15, 2002	August 23, 2002 Form 8-K, Exhibit 4.3, File No. 1-2967
4.20	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated March 5, 2003 relative to Series BB	March 11, 2003 Form 8-K, Exhibit 4.4, File No. 1-2967
4.21	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated February 1, 2004 relative to Series 2004A (1998A)	March 31, 2004 Form 10-Q, Exhibit 4.1, File No. 1-2967
4.22	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated February 1, 2004 relative to Series 2004B (1998B)	March 31, 2004 Form 10-Q, Exhibit 4.2, File No. 1-2967
4.23	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated February 1, 2004 relative to Series 2004C (1998C)	March 31, 2004 Form 10-Q, Exhibit 4.3, File No. 1-2967
4.24	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated February 1, 2004 relative to Series 2004H (1992)	March 31, 2004 Form 10-Q, Exhibit 4.8, File No. 1-2967
4.25	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated July 1, 2005 relative to Series II	July 21, 2005 Form 8-K, Exhibit 4.4, File No. 1-2967
4.26	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated March 1, 2009 relative to Series NN	March 23, 2009 Form 8-K, Exhibit 4.5, File No. 1-2967
4.27	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated May 15, 2012	Exhibit 4.45, File No. 333-182258
4.28	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated September 1, 2012 relative to Series OO	September 11, 2012 Form 8-K, Exhibit 4.4, File No. 1-2967
4.29	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated April 1, 2014 relative to Series PP	April 4, 2014 Form 8-K, Exhibit 4.5, File No. 1-2967
4.30	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated March 15, 2015 relative to Series QQ	April 6, 2015 Form 8-K, Exhibit 4.5, File No. 1-2967
4.31	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated June 1, 2017 relative to Series RR	June 15, 2017 Form 8-K, Exhibit 4.5, File No. 1-2967
4.32	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated April 1, 2018 for 4.000% First Mortgage Bonds due 2048	April 6, 2018 Form 8-K, Exhibit 4.2, File No. 1-2967
4.33	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated March 1, 2019, for 3.50% First Mortgage Bonds due 2029	March 6, 2019 Form 8-K, Exhibit 4.2, File No. 1-2967
4.34	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated September 15, 2019, for 3.25% First Mortgage Bonds due 2049	October 1, 2019 Form 8-K, Exhibit 4.2, File No. 1-2967
4.35	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated March 1, 2020, for 2.95% First Mortgage Bonds due 2030	March 20, 2020 Form 8-K, Exhibit 4.2, File No. 1-2967
4.36	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated October 1, 2020, for 2.625% First Mortgage Bonds due 2051	October 9, 2020 Form 8-K, Exhibit 4.2, File No. 1-2967
4.37	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated June 1, 2021, for 2.15% First Mortgage Bonds due 2032	June 22, 2021 Form 8-K, Exhibit 4.2, File No. 1-2967
4.38	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated March 1, 2022, for 3.90% First Mortgage Bonds due 2052	April 1, 2022 Form 8-K, Exhibit 4.2, File No. 1-2967
4.39	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated February 1, 2023, for 5.45% First Mortgage Bonds due 2053	March 13, 2023 Form 8-K, Exhibit 4.2, File No. 1-2967
4.40	Ameren Ameren Missouri	Supplemental Indenture to the Ameren Missouri Mortgage dated January 1, 2024, for 5.25% First Mortgage Bonds due 2054	January 9, 2024 Form 8-K, Exhibit 4.2, File No. 1-2967
4.41	Ameren Ameren Missouri	Loan Agreement, dated as of December 1, 1992, between the Missouri Environmental Authority and Ameren Missouri, together with Indenture of Trust dated as of December 1, 1992, between the Missouri Environmental Authority and UMB Bank, N.A. as successor trustee to Mercantile Bank of St. Louis, N.A.	1992 Form 10-K, Exhibit 4.38, File No. 1-2967
4.42	Ameren Ameren Missouri	First Amendment, dated as of February 1, 2004, to Loan Agreement dated as of December 1, 1992, between the Missouri Environmental Authority and Ameren Missouri	March 31, 2004 Form 10-Q, Exhibit 4.10, File No. 1-2967
4.43	Ameren Ameren Missouri	Series 1998A Loan Agreement, dated as of September 1, 1998, between the Missouri Environmental Authority and Ameren Missouri	September 30, 1998 Form 10-Q, Exhibit 4.28, File No. 1-2967
4.44	Ameren Ameren Missouri	First Amendment, dated as of February 1, 2004, to Series 1998A Loan Agreement dated as of September 1, 1998, between the Missouri Environmental Authority and Ameren Missouri	March 31, 2004 Form 10-Q, Exhibit 4.11, File No. 1-2967
4.45	Ameren Ameren Missouri	Series 1998B Loan Agreement, dated as of September 1, 1998, between the Missouri Environmental Authority and Ameren Missouri	September 30, 1998 Form 10-Q, Exhibit 4.29, File No. 1-2967

Table of Conten t s


Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
4.46	Ameren Ameren Missouri	First Amendment, dated as of February 1, 2004, to Series 1998B Loan Agreement dated as of September 1, 1998, between the Missouri Environmental Authority and Ameren Missouri	March 31, 2004 Form 10-Q, Exhibit 4.12, File No. 1-2967
4.47	Ameren Ameren Missouri	Series 1998C Loan Agreement, dated as of September 1, 1998, between the Missouri Environmental Authority and Ameren Missouri	September 30, 1998 Form 10-Q, Exhibit 4.30, File No. 1-2967
4.48	Ameren Ameren Missouri	First Amendment, dated as of February 1, 2004, to Series 1998C Loan Agreement dated as of September 1, 1998, between the Missouri Environmental Authority and Ameren Missouri	March 31, 2004 Form 10-Q, Exhibit 4.13, File No. 1-2967
4.49	Ameren Ameren Missouri	Indenture, dated as of August 15, 2002, from Ameren Missouri to The Bank of New York Mellon, as successor trustee (relating to senior secured debt securities) (Ameren Missouri Indenture)	August 23, 2002 Form 8-K, Exhibit 4.1, File No. 1-2967
4.50	Ameren Ameren Missouri	First Supplemental Indenture to the Ameren Missouri Indenture, dated as of May 15, 2012	Exhibit 4.48, File No. 333-182258
4.51	Ameren Ameren Missouri	Ameren Missouri Indenture Company Order, dated March 10, 2003, establishing the 5.50% Senior Secured Notes due 2034 (including the global note)	March 11, 2003 Form 8-K, Exhibits 4.2 and 4.3, File No. 1-2967
4.52	Ameren Ameren Missouri	Ameren Missouri Indenture Company Order, dated July 21, 2005, establishing the 5.30% Senior Secured Notes due 2037 (including the global note)	July 21, 2005 Form 8-K, Exhibits 4.2 and 4.3, File No. 1-2967
4.53	Ameren Ameren Missouri	Ameren Missouri Indenture Company Order, dated March 20, 2009, establishing the 8.45% Senior Secured Notes due 2039 (including the global note)	March 23, 2009 Form 8-K, Exhibits 4.2 and 4.3, File No. 1-2967
4.54	Ameren Ameren Missouri	Ameren Missouri Indenture Company Order, dated September 11, 2012, establishing the 3.90% Senior Secured Notes due 2042 (including the global note)	September 30, 2012 Form 10-Q, Exhibit 4.1 and September 11, 2012 Form 8-K, Exhibit 4.2, File No. 1-2967
4.55	Ameren Ameren Missouri	Ameren Missouri Indenture Company Order, dated April 4, 2014, establishing the 3.50% Senior Secured Notes due 2024 (including the global note)	April 4, 2014 Form 8-K, Exhibits 4.2 and 4.3, File No. 1-2967
4.56	Ameren Ameren Missouri	Ameren Missouri Indenture Company Order, dated April 6, 2015, establishing the 3.65% Senior Secured Notes due 2045 (including the global note)	April 6, 2015 Form 8-K, Exhibits 4.2 and 4.3, File No. 1-2967
4.57	Ameren Ameren Missouri	Ameren Missouri Indenture Company Order, dated June 23, 2016, requesting authentication of an additional $150,000,000 aggregate principal amount of 3.65% Senior Secured Notes due 2045 (including the global note)	June 23, 2016 Form 8-K, Exhibits 4.3, and 4.4, File No. 1-2967
4.58	Ameren Ameren Missouri	Ameren Missouri Indenture Company Order, dated June 15, 2017, establishing the 2.950% Senior Secured Notes due 2027 (including the global note)	June 15, 2017 Form 8-K, Exhibits 4.2 and 4.3, File No. 1-2967
4.59	Ameren Ameren Illinois	Indenture, dated as of December 1, 1998, from Ameren Illinois (formerly Central Illinois Public Service Company) to The Bank of New York Mellon Trust Company, N.A., as successor trustee (CIPS Indenture)	Exhibit 4.4, File No. 333-59438
4.60	Ameren Ameren Illinois	First Supplemental Indenture to the CIPS Indenture, dated as of June 14, 2006	June 19, 2006 Form 8-K, Exhibit 4.2, File No. 1-3672
4.61	Ameren Ameren Illinois	Second Supplemental Indenture to the CIPS Indenture, dated as of March 1, 2010	Exhibit 4.17, File No. 333-166095
4.62	Ameren Ameren Illinois	Third Supplemental Indenture to the CIPS Indenture, dated as of October 1, 2010	2010 Form 10-K, Exhibit 4.59, File No. 1-3672
4.63	Ameren Ameren Illinois	Ameren Illinois Global Note, dated October 1, 2010, representing CIPS Indenture Senior Notes, 6.125% due 2028	2010 Form 10-K, Exhibit 4.60, File No. 1-3672
4.64	Ameren Ameren Illinois	Ameren Illinois Global Note, dated October 1, 2010, representing CIPS Indenture Senior Notes, 6.70% Series Secured Notes due 2036	2010 Form 10-K, Exhibit 4.62, File No. 1-3672
4.65	Ameren Ameren Illinois	Indenture, dated as of June 1, 2006, from Ameren Illinois (successor in interest to Central Illinois Light Company) to The Bank of New York Mellon Trust Company, N.A., as successor trustee (CILCO Indenture)	June 19, 2006 Form 8-K, Exhibit 4.3, File No. 1-14756
4.66	Ameren Ameren Illinois	First Supplemental Indenture to the CILCO Indenture, dated October 1, 2010	October 7, 2010 Form 8-K, Exhibit 4.1, File No. 1-3672
4.67	Ameren Ameren Illinois	Second Supplemental Indenture to the CILCO Indenture dated as of July 21, 2011	September 30, 2011 Form 10-Q, Exhibit 4.1, File No. 1-3672
4.68	Ameren Ameren Illinois	Third Supplemental Indenture to the CILCO Indenture, dated as of October 15, 2019	September 30, 2019 Form 10-Q, Exhibit 4.2, File No. 1-3672
4.69	Ameren Ameren Illinois	CILCO Indenture Company Order, dated June 14, 2006, establishing the 6.70% Senior Secured Notes due 2036 (including the global note)	June 19, 2006 Form 8-K, Exhibit 4.6, File No. 1-14756
4.70	Ameren Ameren Illinois	General Mortgage Indenture and Deed of Trust, dated as of November 1, 1992 between Ameren Illinois (successor in interest to Illinois Power Company) and The Bank of New York Mellon Trust Company, N.A., as successor trustee (Ameren Illinois Mortgage)	1992 Form 10-K, Exhibit 4(cc), File No. 1-3004
4.71	Ameren Ameren Illinois	Supplemental Indenture amending the Ameren Illinois Mortgage dated as of December 15, 2002	December 23, 2002 Form 8-K, Exhibit 4.1, File No. 1-3004

Table of Conten t s


Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
4.72	Ameren Ameren Illinois	Supplemental Indenture, dated as of October 1, 2010, to Ameren Illinois Mortgage for Series CIPS-AA and CIPS-CC	October 7, 2010 Form 8-K, Exhibit 4.9, File No. 1-3672
4.73	Ameren Ameren Illinois	Supplemental Indenture, dated as of January 15, 2011, to Ameren Illinois Mortgage	Exhibit 4.78, File No. 333-182258
4.74	Ameren Ameren Illinois	Supplemental Indenture, dated as of August 1, 2012, to Ameren Illinois Mortgage for Series EE	August 20, 2012 Form 8-K, Exhibit 4.5, File No. 1-3672
4.75	Ameren Ameren Illinois	Supplemental Indenture, dated as of December 1, 2013, to Ameren Illinois Mortgage for Series FF	December 10, 2013 Form 8-K, Exhibit 4.5, File No. 1-3672
4.76	Ameren Ameren Illinois	Supplemental Indenture, dated as of June 1, 2014, to Ameren Illinois Mortgage for Series GG	June 30, 2014 Form 8-K, Exhibit 4.5, File No. 1-3672
4.77	Ameren Ameren Illinois	Supplemental Indenture, dated as of December 1, 2014, to Ameren Illinois Mortgage for Series HH	December 10, 2014 Form 8-K, Exhibit 4.5, File No. 1-3672
4.78	Ameren Ameren Illinois	Supplemental Indenture, dated as of December 1, 2015, to Ameren Illinois Mortgage for Series II	December 14, 2015 Form 8-K, Exhibit 4.5, File No. 1-3672
4.79	Ameren Ameren Illinois	Supplemental Indenture, dated as of October 25, 2017, to the Ameren Illinois Mortgage	September 30, 2017 Form 10-Q, Exhibit 4.1, File No. 1-3672
4.80	Ameren Ameren Illinois	Supplemental Indenture, dated as of November 1, 2017, to the Ameren Illinois Mortgage for 3.70% First Mortgage Bonds due 2047	November 28, 2017 Form 8-K, Exhibit 4.2, File No. 1-3672
4.81	Ameren Ameren Illinois	Supplemental Indenture, dated as of May 1, 2018, to Ameren Illinois Mortgage for 3.80% First Mortgage Bonds due 2028	May 22, 2018 Form 8-K, Exhibit 4.2, File No. 1-3672
4.82	Ameren Ameren Illinois	Supplemental Indenture, dated as of November 1, 2018, to Ameren Illinois Mortgage for 4.50% First Mortgage Bonds due 2049	November 15, 2018 Form 8-K, Exhibit 4.2, File No. 1-3672
4.83	Ameren Ameren Illinois	Supplemental Indenture, dated as of October 15, 2019, to Ameren Illinois Mortgage for First Mortgage Bonds, Senior Notes Series CILCO-AA	September 30, 2019 Form 10-Q, Exhibit 4.3, File No. 1-3672
4.84	Ameren Ameren Illinois	Supplemental Indenture, dated as of November 1, 2019, to the Ameren Illinois Mortgage for 3.25% First Mortgage Bonds due 2050	November 26, 2019 Form 8-K, Exhibit 4.2, File No. 1-3672
4.85	Ameren Ameren Illinois	Supplemental Indenture, dated as of December 15, 2019, to the Ameren Illinois Mortgage	2019 Form 10-K, Exhibit 4.79, File No. 1-3672
4.86	Ameren Ameren Illinois	Supplemental Indenture, dated as of November 1, 2020, to Ameren Illinois Mortgage for 1.55% First Mortgage Bonds due 2030	November 23, 2020 Form 8-K, Exhibit 4.2, File No. 1-3672
4.87	Ameren Ameren Illinois	Supplemental Indenture, dated as of June 1, 2021, to Ameren Illinois Mortgage for 0.375% First Mortgage Bonds due 2023 and 2.90% First Mortgage Bonds due 2051	June 29, 2021 Form 8-K, Exhibit 4.2, File No. 1-3672
4.88	Ameren Ameren Illinois	Supplemental Indenture, dated as of August 1, 2022, to Ameren Illinois Mortgage for 3.85% First Mortgage Bonds due 2032	August 29, 2022 Form 8-K, Exhibit 4.2, File No. 1-3672
4.89	Ameren Ameren Illinois	Supplemental Indenture, dated as of November 1, 2022, to Ameren Illinois Mortgage for 5.90% First Mortgage Bonds due 2052	November 22, 2022 Form 8-K, Exhibit 4.2, File No. 1-3672
4.90	Ameren Ameren Illinois	Supplemental Indenture, dated as of May 1, 2023, to Ameren Illinois Mortgage for 4.95% First Mortgage Bonds due 20 3 3	May 31, 2023 Form 8-K, Exhibit 4.2, File No. 1-3672
4.91	Ameren Ameren Illinois	Indenture, dated as of June 1, 2006, from Ameren Illinois (successor in interest to Illinois Power Company) to The Bank of New York Mellon Trust Company, N.A., as successor trustee (Ameren Illinois Indenture)	June 19, 2006 Form 8-K, Exhibit 4.4, File No. 1-14756
4.92	Ameren Ameren Illinois	First Supplemental Indenture, dated as of October 1, 2010, to the Ameren Illinois Indenture for Series CIPS-AA and CIPS-CC	October 7, 2010 Form 8-K, Exhibit 4.5, File No. 1-14756
4.93	Ameren Ameren Illinois	Second Supplemental Indenture to the Ameren Illinois Indenture dated as of July 21, 2011	September 30, 2011 Form 10-Q, Exhibit 4.2, File No. 1-3672
4.94	Ameren Ameren Illinois	Third Supplemental Indenture to the Ameren Illinois Indenture dated as of May 15, 2012	Exhibit 4.83, File No. 333-182258
4.95	Ameren Ameren Illinois	Fourth Supplemental Indenture to the Ameren Illinois Indenture, dated as of October 15, 2019	September 30, 2019 Form 10-Q, Exhibit 4.4, File No. 1-3672
4.96	Ameren Ameren Illinois	Ameren Illinois Indenture Company Order dated December 10, 2013, establishing the 4.80% Senior Secured Notes due 2043 (including the global note)	December 10, 2013 Form 8-K, Exhibits 4.2 and 4.3, File No. 1-3672
4.97	Ameren Ameren Illinois	Ameren Illinois Indenture Company Order dated June 30, 2014, establishing the 4.30% Senior Secured Notes due 2044 (including the global note)	June 30, 2014 Form 8-K, Exhibits 4.2 and 4.3, File No. 1-3672
4.98	Ameren Ameren Illinois	Ameren Illinois Indenture Company Order dated December 10, 2014, establishing the 3.25% Senior Secured Notes due 2025 (including the global note)	December 10, 2014 Form 8-K, Exhibits 4.2 and 4.3, File No. 1-3672
4.99	Ameren Ameren Illinois	Ameren Illinois Indenture Company Order dated December 14, 2015, establishing the 4.15% Senior Secured Notes due 2046 (including the global note)	December 14, 2015 Form 8-K, Exhibits 4.2 and 4.3, File No. 1-3672

Table of Conten t s


Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
4.100	Ameren Ameren Illinois	Ameren Illinois Indenture Company Order dated December 6, 2016, requesting the authentication of an additional $240,000,000 aggregate principal amount of 4.15% Senior Secured Notes due 2046 (including the global note)	December 6, 2016 Form 8-K, Exhibits 4.2 and 4.3, File No. 1-3672
4.101	Ameren Ameren Illinois	Ameren Illinois Indenture Company Order dated October 30, 2019, establishing Senior Notes Series CILCO-AA (including the global note)	September 30, 2019 Form 10-Q, Exhibits 4.5 and 4.6, File No. 1-3672
4.102	Ameren	Description of Ameren Securities	2021 Form 10-K, Exhibit 4.98, File No. 1-14756
4.103	Ameren Missouri	Description of Ameren Missouri Securities	2021 Form 10-K, Exhibit 4.99, File No. 1-14756
4.104	Ameren Illinois	Description of Ameren Illinois Securities	2021 Form 10-K, Exhibit 4.100, File No. 1-14756
Material Contracts
10.1	Ameren Companies	Fourth Amended Ameren Corporation System Utility Money Pool Agreement, as amended January 30, 2014	June 30, 2015 Form 10-Q, Exhibit 10.1, File No. 1-14756
10.2	Ameren Ameren Missouri	Amended and Restated Credit Agreement, dated as of December 6, 2022, by and among Ameren, Ameren Missouri and JP Morgan Chase Bank, N.A., as agent and the lenders party thereto	December 6, 2022 Form 8-K, Exhibit 10.1, File No. 1-2967
10.3	Ameren Ameren Missouri	First Amendment , dated as of April 19, 2023, to Amended and Restated Credit Agreement, dated as of December 6, 2022, by and among Ameren, Ameren Missouri and JPMorgan Chase Bank, N.A., as agent and the lenders party thereto	August 3, 2023 Form 10-Q, Exhibit 10.1, File No. 1-2967
10.4	Ameren Ameren Illinois	Amended and Restated Credit Agreement, dated as of December 6, 2022, by and among Ameren, Ameren Illinois and JP Morgan Chase Bank, N.A., as agent and the lenders party thereto	December 6, 2022 Form 8-K, Exhibit 10.2, File No. 1-3672
10.5	Ameren Ameren Illinois	First Amendment, dated as of April 19, 2023, to Amended and Restated Credit Agreement, dated as of December 6, 2022, by and among Ameren, Ameren Illinois and JPMorgan Chase Bank, N.A., as agent and the lenders party thereto	August 3, 2023 Form 10-Q, Exhibit 10.2, File No. 1-3672
10.6	Ameren	*Summary Sheet of Ameren Corporation Non-Management Director Compensation effective as of January 1, 2022	2021 Form 10-K, Exhibit 10.6, File No. 1-14756
10.7	Ameren	*Ameren ’s Deferred Compensation Plan for Members of the Board of Directors amended and restated effective January 1, 2009, dated June 13, 2008	June 30, 2008 Form 10-Q, Exhibit 10.3, File No. 1-14756
10.8	Ameren	*Amendment dated October 12, 2009, to Ameren ’s Deferred Compensation Plan for Members of the Board of Directors, effective January 1, 2010	2009 Form 10-K, Exhibit 10.15, File No. 1-14756
10.9	Ameren	*Amendment dated October 14, 2010, to Ameren’s Deferred Compensation Plan for Members of the Board of Directors	2010 Form 10-K, Exhibit 10.15, File No. 1-14756
10.10	Ameren	*Ameren’s Deferred Compensation Plan as amended and restated effective January 1, 2023
10.11	Ameren Companies	*2020 Ameren Short-Term Incentive Plan	2019 Form 10-K, Exhibit 10.17, File No. 1-14756
10.12	Ameren Companies	*2021 Ameren Short-Term Incentive Plan	2020 Form 10-K, Exhibit 10.16, File No. 1-14756
10.13	Ameren Companies	*2022 Ameren Short-Term Incentive Plan	2021 Form 10-K, Exhibit 10.16, File No., 1-14756
10.14	Ameren Companies	*2023 Ameren Short-Term Incentive Plan	2022 Form 10-K, Exhibit 10.17, File No. 1-14756
10.15	Ameren Companies	*2024 Ameren Short-Term Incentive Plan
10.16	Ameren Companies	*2021 Base Salary Table for Named Executive Officers	2020 Form 10-K, Exhibit 10.23, File No. 1-14756
10.17	Ameren Companies	*2022 Base Salary Table for Named Executive Officers	2021 Form 10-K, Exhibit 10.20, File No. 1-14756
10.18	Ameren Companies	*2023 Base Salary Table for Named Executive Officers	2022 Form 10-K, Exhibit 10.21, File No. 1-14756
10.19	Ameren Companies	*2024 Base Salary Table for Named Executive Officers
10.20	Ameren Companies	*Second Amended and Restated Ameren Corporation Change of Control Severance Plan	2008 Form 10-K, Exhibit 10.37, File No. 1-14756
10.21	Ameren Companies	*First Amendment dated October 12, 2009, to the Second Amended and Restated Ameren Change of Control Severance Plan	October 14, 2009 Form 8-K, Exhibit 10.2, File No. 1-14756
10.22	Ameren Companies	*Revised Schedule I to Second Amended and Restated Ameren Change of Control Severance Plan, as amended
10.23	Ameren Companies	*Formula for Determining 2018 Target Performance Share Unit and Restricted Stock Unit Awards to be Issued to Named Executive Officers	2017 Form 10-K, Exhibit 10.24, File No. 1-14756
10.24	Ameren Companies	*Formula for Determining 2019 Target Performance Share Unit and Restricted Stock Unit Awards to be Issued to Named Executive Officers	2018 Form 10-K, Exhibit 10.27, File No. 1-14756
10.25	Ameren Companies	*Formula for Determining 2020 Target Performance Share Unit and Restricted Stock Unit Awards to be Issued to Named Executive Officers	2019 Form 10-K, Exhibit 10.32, File No. 1-14756
10.26	Ameren Companies	*Formula for Determining 2021 Target Performance Share Unit and Restricted Stock Unit Awards to be Issued to Named Executive Officers	2020 Form 10-K, Exhibit 10.33, File No. 1-14756

Table of Conten t s


Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
10.27	Ameren Companies	“Formula for Determining 2022 Target Performance Share Unit and Restricted Stock Unit Awards to be Issued to Named Executive Officers	2021 Form 10-K, Exhibit 10.30, File No. 1-14756
10.28	Ameren Companies	*Formula for Determining 2023 Target Performance Share Unit and Restricted Stock Unit Awards to be Issued to Named Executive Officers	2022 Form 10-K, Exhibit 10.31, File No. 1-14756
10.29	Ameren Companies	*Formula for Determining 2024 Target Performance Share Unit and Restricted Stock Unit Awards to be Issued to Named Executive Officers
10.30	Ameren Companies	*Ameren Corporation 2014 Omnibus Incentive Compensation Plan	Exhibit 99, File No. 333-196515
10.31	Ameren Companies	*Form of Performance Share Unit Award Agreement for Awards Issued in 2018 pursuant to 2014 Omnibus Incentive Compensation Plan	December 13, 2017 Form 8-K, Exhibit 10.1, File No. 1-14756
10.32	Ameren Companies	*Form of Restricted Stock Unit Award Agreement for Awards Issued in 2018 pursuant to 2014 Omnibus Incentive Compensation Plan	December 13, 2017 Form 8-K, Exhibit 10.2, File No. 1-14756
10.33	Ameren Companies	*Form of Performance Share Unit Award Agreement for Awards Issued in 2019 pursuant to 2014 Omnibus Incentive Compensation Plan	2018 Form 10-K, Exhibit 10.34, File No. 1-14756
10.34	Ameren Companies	*Form of Restricted Stock Unit Award Agreement for Awards Issued in 2019 pursuant to 2014 Omnibus Incentive Compensation Plan	2018 Form 10-K, Exhibit 10.35, File No. 1-14756
10.35	Ameren Companies	*Form of Performance Share Unit Award Agreement for Awards Issued in 2020 pursuant to 2014 Omnibus Incentive Compensation Plan	2019 Form 10-K, Exhibit 10.41, File No. 1-14756
10.36	Ameren Companies	*Form of Restricted Share Unit Award Agreement for Awards Issued in 2020 pursuant to 2014 Omnibus Incentive Compensation Plan	2019 Form 10-K, Exhibit 10.42, File No. 1-14756
10.37	Ameren Companies	*Form of Performance Share Unit Award Agreement for Awards Issued in 2021 pursuant to 2014 Omnibus Incentive Compensation Plan	2020 Form 10-K, Exhibit 10.44, File No. 1-14756
10.38	Ameren Companies	*Form of Restricted Share Unit Award Agreement for Awards Issued in 2021 pursuant to 2014 Omnibus Incentive Compensation Plan	2020 Form 10-K, Exhibit 10.45, File No. 1-14756
10.39	Ameren Companies	*Form of Performance Share Unit Award Agreement for Awards Issued in 2022 pursuant to 2014 Omnibus Incentive Compensation Plan	2021 Form 10-K, Exhibit 10.42, File No. 1-14756
10.40	Ameren Companies	*Form of Restricted Share Unit Award Agreement for Awards Issued in 2022 pursuant to 2014 Omnibus Incentive Compensation Plan	2021 Form 10-K, Exhibit 10.43, File No. 1-14756
10.41	Ameren Companies	*Ameren Corporation 2022 Omnibus Incentive Compensation Plan	May 13, 2022 Form 8-K, Exhibit 10.1, File No. 1-14756
10.42	Ameren Companies	*Form of Performance Share Unit Award Agreement (Relative Total Shareholder Return metric) for awards issued in 2023 pursuant to 2022 Omnibus Incentive Compensation Plan	2022 Form 10-K, Exhibit 10.45, File No. 1-14756
10.43	Ameren Companies	*Form of Performance Share Unit Award Agreement (Clean Energy Transition metric) for awards issued in 2023 pursuant to 2022 Omnibus Incentive Compensation Plan	2022 Form 10-K, Exhibit 10.46, File No. 1-14756
10.44	Ameren Companies	*Form of Restrictive Stock Unit Award Agreement for awards issued in 2023 pursuant to 2022 Omnibus Incentive Compensation Plan	2022 Form 10-K, Exhibit 10.47, File No. 1-14756
10.45	Ameren Companies	*Form of Performance Share Unit Award Agreement (Relative Total Shareholder Return metric) for awards issued in 2024 pursuant to 2022 Omnibus Incentive Compensation Plan
10.46	Ameren Companies	*Form of Performance Share Unit Award Agreement (Clean Energy Transition metric) for awards issued in 2024 pursuant to 2022 Omnibus Incentive Compensation Plan
10.47	Ameren Companies	*Form of Restrictive Stock Unit Award Agreement for awards issued in 2024 pursuant to 2022 Omnibus Incentive Compensation Plan
10.48	Ameren Companies	*Performance-Based Restricted Share Unit Award Agreement, dated as of November 1, 2023, between Ameren and Michael L. Moehn
10.49	Ameren Companies	*Ameren Corporation Severance Plan for Ameren Officers, effective January 1, 2019	2018 Form 10-K, Exhibit 10.36, File No. 1-14756
10.50	Ameren Companies	*Ameren Supplemental Retirement Plan , amended and restated effective January 1, 2008, dated June 13, 2008	June 30, 2008 Form 10-Q, Exhibit 10.1, File No. 1-14756
10.51	Ameren Companies	*First Amendment to amended and restated Ameren Supplemental Retirement Plan, dated October 24, 2008	2008 Form 10-K, Exhibit 10.44, File No. 1-14756
10.52	Ameren Companies	*Second Amendment to amended and restated Ameren Supplemental Retirement Plan, dated November 27, 2013
10.53	Ameren Companies	*Third Amendment to amended and restated Ameren Supplemental Retirement Plan, dated January 5, 2015
10.54	Ameren Companies	*Fourth Amendment to amended and restated Ameren Supplemental Retirement Plan, dated November 3, 2015
10.55	Ameren Companies	*Fifth Amendment to amended and restated Ameren Supplemental Retirement Plan, dated October 13, 2023
Subsidiaries of the Registrant
21.1	Ameren Companies	Subsidiaries of Ameren
Consent of Experts and Counsel

Table of Conten t s


Exhibit Designation	Registrant(s)	Nature of Exhibit	Previously Filed as Exhibit to:
23.1	Ameren	Consent of Independent Registered Public Accounting Firm with respect to Ameren
23.2	Ameren Missouri	Consent of Independent Registered Public Accounting Firm with respect to Ameren Missouri
23.3	Ameren Illinois	Consent of Independent Registered Public Accounting Firm with respect to Ameren Illinois
Power of Attorney
24.1	Ameren	Powers of Attorney with respect to Ameren
24.2	Ameren Missouri	Powers of Attorney with respect to Ameren Missouri
24.3	Ameren Illinois	Powers of Attorney with respect to Ameren Illinois
Rule 13a-14(a)/15d-14(a) Certifications
31.1	Ameren	Rule 13a-14(a)/15d-14(a) Certification of Principal Executive Officer of Ameren
31.2	Ameren	Rule 13a-14(a)/15d-14(a) Certification of Principal Financial Officer of Ameren
31.3	Ameren Missouri	Rule 13a-14(a)/15d-14(a) Certification of Principal Executive Officer of Ameren Missouri
31.4	Ameren Missouri	Rule 13a-14(a)/15d-14(a) Certification of Principal Financial Officer of Ameren Missouri
31.5	Ameren Illinois	Rule 13a-14(a)/15d-14(a) Certification of Principal Executive Officer of Ameren Illinois
31.6	Ameren Illinois	Rule 13a-14(a)/15d-14(a) Certification of Principal Financial Officer of Ameren Illinois
Section 1350 Certifications
32.1	Ameren	Section 1350 Certification of Principal Executive Officer and Principal Financial Officer of Ameren
32.2	Ameren Missouri	Section 1350 Certification of Principal Executive Officer and Principal Financial Officer of Ameren Missouri
32.3	Ameren Illinois	Section 1350 Certification of Principal Executive Officer and Principal Financial Officer of Ameren Illinois
Policy Relating to Recovery of Erroneously Awarded Compensation
97.1	Ameren Companies	Ameren Corporation Financial Restatement Compensation Recoupment Policy, as adopted August 10, 2023
Additional Exhibits
99.1	Ameren Companies	Amended and Restated Tax Allocation Agreement, dated as of December 22, 2022	2022 Form 10-K, Exhibit 99.1, File No. 1-14756
Interactive Data Files
101.INS	Ameren Companies	Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCH	Ameren Companies	XBRL Taxonomy Extension Schema Document
101.CAL	Ameren Companies	XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB	Ameren Companies	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	Ameren Companies	XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF	Ameren Companies	XBRL Taxonomy Extension Definition Document
104	Ameren Companies	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

The file number references for the Ameren Companies’ filings with the SEC are: Ameren, 1-14756; Ameren Missouri, 1-2967; and Ameren Illinois, 1-3672.

*Compensatory plan or arrangement.

Each registrant hereby undertakes to furnish to the SEC upon request a copy of any long-term debt instrument not listed above that such registrant has not filed as an exhibit pursuant to the exemption provided by Item 601(b)(4)(iii)(A) of Regulation S-K.

Table of Conten t s

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, each registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. The signatures for each undersigned company shall be deemed to relate only to matters having reference to such company or its subsidiaries.


		AMEREN CORPORATION (registrant)

Date:	February 29, 2024	By	/s/ Martin J. Lyons, Jr.
			Martin J. Lyons, Jr. Chairman, President, and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the date indicated.


/s/ Martin J. Lyons, Jr.		Chairman, President, and Chief Executive Officer, and Director (Principal Executive Officer)	February 29, 2024
Martin J. Lyons, Jr.

/s/ Michael L. Moehn		Senior Executive Vice President and Chief Financial Officer (Principal Financial Officer)	February 29, 2024
Michael L. Moehn

/s/ Theresa A. Shaw		Senior Vice President, Finance, and Chief Accounting Officer (Principal Accounting Officer)	February 29, 2024
Theresa A. Shaw

*		Director	February 29, 2024
Cynthia J. Brinkley

*		Director	February 29, 2024
Catherine S. Brune

*		Director	February 29, 2024
J. Edward Coleman

*		Director	February 29, 2024
Ward H. Dickson

*		Director	February 29, 2024
Noelle K. Eder

*		Director	February 29, 2024
Ellen M. Fitzsimmons

*		Director	February 29, 2024
Rafael Flores

*		Director	February 29, 2024
Kimberly J. Harris

*		Director	February 29, 2024
Richard J. Harshman

*		Director	February 29, 2024
Craig S. Ivey

*		Director	February 29, 2024
James C. Johnson

*		Director	February 29, 2024
Steven H. Lipstein

*		Director	February 29, 2024
Leo S. Mackay, Jr.

*By	/s/ Michael L. Moehn		February 29, 2024
	Michael L. Moehn
	Attorney-in-Fact

Table of Conten t s


		UNION ELECTRIC COMPANY (registrant)

Date:	February 29, 2024	By	/s/ Mark C. Birk
			Mark C. Birk Chairman and President


/s/ Mark C. Birk		Chairman and President, and Director (Principal Executive Officer)	February 29, 2024
Mark C. Birk

/s/ Michael L. Moehn		Senior Executive Vice President and Chief Financial Officer, and Director (Principal Financial Officer)	February 29, 2024
Michael L. Moehn

/s/ Theresa A. Shaw		Senior Vice President, Finance, and Chief Accounting Officer (Principal Accounting Officer)	February 29, 2024
Theresa A. Shaw

*		Director	February 29, 2024
Bhavani Amirthalingam

*		Director	February 29, 2024
Fadi M. Diya

*		Director	February 29, 2024
Chonda J. Nwamu

*By	/s/ Michael L. Moehn		February 29, 2024
	Michael L. Moehn
	Attorney-in-Fact

Table of Conten t s


		AMEREN ILLINOIS COMPANY (registrant)

Date:	February 29, 2024	By	/s/ Leonard P. Singh
			Leonard P. Singh Chairman and President


/s/ Leonard P. Singh		Chairman and President, and Director (Principal Executive Officer)	February 29, 2024
Leonard P. Singh

/s/ Michael L. Moehn		Senior Executive Vice President and Chief Financial Officer, and Director (Principal Financial Officer)	February 29, 2024
Michael L. Moehn

/s/ Theresa A. Shaw		Senior Vice President, Finance, and Chief Accounting Officer, and Director (Principal Accounting Officer)	February 29, 2024
Theresa A. Shaw

*		Director	February 29, 2024
Chonda J. Nwamu

*		Director	February 29, 2024
Patrick E. Smith




*By	/s/ Michael L. Moehn		February 29, 2024
	Michael L. Moehn
	Attorney-in-Fact

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