Offerings // OMNICOM GROUP INC.

OMC offering history

Every offering-related filing in OMNICOM GROUP INC.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 1,001 filings back to Mar 29, 2016.

Last executed offering

Feb 27, 2026

424B2 — priced deal (shares or notes)

Last registration (announced)

Oct 21, 2024

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
Feb 27, 2026	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Feb 27, 2026	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Feb 25, 2026	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Feb 25, 2026	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Feb 25, 2026	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Feb 25, 2026	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Dec 12, 2025	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Dec 12, 2025	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Jan 30, 2025	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jan 30, 2025	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Oct 21, 2024	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
Jul 31, 2024	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Jul 30, 2024	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Jul 30, 2024	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Feb 29, 2024	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Feb 28, 2024	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Feb 28, 2024	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Nov 19, 2021	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Nov 17, 2021	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Nov 17, 2021	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Nov 12, 2021	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
Apr 29, 2021	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Apr 28, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Apr 28, 2021	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Mar 30, 2020	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Mar 27, 2020	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Mar 27, 2020	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Feb 20, 2020	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Feb 19, 2020	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
Feb 19, 2020	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Feb 19, 2020	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Jun 26, 2019	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Jun 24, 2019	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Jun 24, 2019	FWP →	MARKETING	Free-writing prospectus — offering being marketed
May 21, 2019	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
Dec 4, 2017	S-3ASR →	REGISTERED	Automatic shelf registration — effective immediately (large filers)
Mar 29, 2016	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Mar 29, 2016	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital

OMC 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.

Is a shelf active now? →Do they need money? →Red flags →Full OMC workspace →

OMC offering FAQ

When did OMC last execute an offering?

Per SEC filings, OMNICOM GROUP INC.'s most recent priced offering document is a 424B2 filed 2026-02-27. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did OMC last announce or register an offering?

The most recent registration is a S-3ASR filed 2024-10-21. 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.