When did OMC join the S&P 500?

Omnicom Group joined the S&P 500 index on 1997-12-31.

What sector is OMC in?

OMC is in the Communication Services sector, Advertising industry.

OMC — Omnicom Group

Name: OMC Institutional Holdings (13F) — 2026Q1
Creator: SEC EDGAR
License: https://www.sec.gov/data

Advertising · Communication Services

Key Facts

Status	Active
Sector	Communication Services
Industry	Advertising
Joined	1997-12-31
Tenure	28 yrs

Omnicom Group Inc. is a holding company that provides advertising, marketing, and corporate communications services. Its agency network operates in the advertising, marketing, and corporate communications services industry and is organized by region: the Americas, Europe, the Middle East, and Asia Pacific.

Industry Peers

TTD

Sector Peers

CHTR CMCSA DIS EA ECHO FOX FOXA GOOG GOOGL LYV

S&P 500 Timeline

1997-12-31Joined S&P 500

Institutional Holdings (13F)

1,122 institutions hold OMC, totaling 368.7M shares ($27.4B) · As of 2026Q1

Rank	Institution	Shares	Value
1	VANGUARD CAPITAL MANAGEMENT LLC	40.6M	$3.1B
2	BlackRock, Inc.	29.5M	$2.2B
3	STATE STREET CORP	27.8M	$2.1B
4	MORGAN STANLEY	17.6M	$1.4B
5	VANGUARD PORTFOLIO MANAGEMENT LLC	14.8M	$1.1B
6	First Eagle Investment Management, LLC	14.6M	$1.1B
7	BARCLAYS PLC	11.1M	$970M
8	Bank of New York Mellon Corp	12.1M	$911M
9	JPMORGAN CHASE & CO	12.0M	$906M
10	GOLDMAN SACHS GROUP INC	9.7M	$764M

View all holders →

Data source: Wikipedia · CC BY-SA 4.0 · SEC EDGAR 13F · Updated 2026-07-10