Offerings // AMEREN CORP

AEE offering history

Every offering-related filing in AMEREN CORP’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 1,010 filings back to Mar 3, 2015.

Last executed offering

Aug 4, 2026

424B5 — priced deal (shares or notes)

Last registration (announced)

Aug 4, 2026

S-3ASR — capacity, not a sale

Executed, last 12 months

424B pricings + 8-K 3.02 sales

Registered, last 12 months

S-1/S-3/F-series registrations

Date	Filing		What it means
Aug 4, 2026	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
Aug 4, 2026	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 15, 2026	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
Feb 27, 2026	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Feb 26, 2026	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Feb 26, 2026	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Aug 7, 2025	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 13, 2025	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
May 12, 2025	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Feb 28, 2025	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Feb 27, 2025	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Feb 27, 2025	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Dec 19, 2023	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Dec 18, 2023	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Dec 18, 2023	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Nov 16, 2023	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Nov 15, 2023	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Nov 15, 2023	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Nov 13, 2023	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Oct 13, 2023	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
May 18, 2023	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
Nov 10, 2022	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jan 7, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Nov 16, 2021	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Nov 15, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Nov 15, 2021	FWP →	MARKETING	Free-writing prospectus — offering being marketed
May 12, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Feb 25, 2021	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Feb 24, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Feb 24, 2021	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Oct 14, 2020	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
May 21, 2020	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
Apr 1, 2020	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Mar 31, 2020	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Mar 31, 2020	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Sep 12, 2019	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Sep 11, 2019	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Sep 11, 2019	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Aug 6, 2019	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Aug 5, 2019	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital

AEE offering-related filings from SEC EDGAR, newest first (capped at 40). Each links to the original document.

Two honest limits. (1) A 424B takedown can price shares or notes— EDGAR’s metadata doesn’t say which, so open the document: large investment-grade filers use these mostly for bond deals (no dilution), small-caps mostly for shares. (2) At-the-market (ATM) programs sell shares gradually and individual sales are not separately filed — the visible footprint is the enabling shelf and its 424B5; actual ATM share counts surface later in the 10-Q/10-K share count. Educational information from public filings, not investment advice.

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AEE offering FAQ

When did AEE last execute an offering?

Per SEC filings, AMEREN CORP's most recent priced offering document is a 424B5 filed 2026-08-04. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did AEE last announce or register an offering?

The most recent registration is a S-3ASR filed 2026-08-04. A registration is capacity to sell shares — not a sale.

Does an offering always mean dilution?

Registered direct offerings and shelf takedowns issue new shares and dilute existing holders. Resale registrations (424B3/B7) let existing holders sell and do not create new shares. Secondary sales by insiders also do not dilute. Each row here is labeled with what it is.