UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
___________________________________________

SCHEDULE 14C INFORMATION

Information Statement Pursuant to Section 14(c) of the
Securities Exchange Act of 1934
(Amendment No. )
___________________________________________

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¨ Preliminary Information Statement

¨ Confidential, for Use of the Commission Only (as permitted by Rule 14c-5(d)(2))

¨ Definitive Information Statement

x Definitive Additional Materials

Union Electric Company
(Name of Registrant as Specified In Its Charter)

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Important Notice Regarding the Availability of Materials Meeting Information Meeting Type:Annual Meeting For holders as of:March 9, 2021 Date: May 6, 2021Time: 10:00 a.m. CDT Location: Meeting live via the Internet - please visit www.virtualshareholdermeeting.com/AEE2021. The company will be hosting the meeting live via the Internet this year. To attend the meeting via the Internet please visit www.virtualshareholdermeeting.com/AEE2021 and be sure to have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page). UNION ELECTRIC COMPANY 1901 CHOUTEAU AVE., MC-1310 ST. LOUIS, MO 63103 You are receiving this communication because you hold securities in the company listed above. They have released informational materials that are now available for your review. This notice provides instructions on how to access UNION ELECTRIC COMPANY materials for informational purposes only. We are not asking you for a proxy and you are requested to not send us a proxy. You may view the materials online at www.proxyvote.com and easily request a paper or e-mail copy (see reverse side). D38393-P50625 See the reverse side for instructions on how to access materials.

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