When did ADP join the S&P 500?

Automatic Data Processing joined the S&P 500 index on 1981-03-31.

What sector is ADP in?

ADP is in the Industrials sector, Human Resource & Employment Services industry.

ADP — Automatic Data Processing

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

Human Resource & Employment Services · Industrials

Key Facts

Status	Active
Sector	Industrials
Industry	Human Resource & Employment Services
Joined	1981-03-31
Tenure	45 yrs

Automatic Data Processing, Inc. (ADP) provides cloud-based human capital management business process outsourcing solutions. The company operates through the following segments: Employer Services, Professional Employer Organization (PEO) Services, and Other. The Employer Services segment offers HR outsourcing, technology-based human capital management solutions, and cloud-based platforms to clients ranging from small businesses with a single employee to large enterprises. The PEO Services segment provides HR outsourcing solutions to small and medium-sized businesses through a co-employment model. The Other segment includes certain corporate overhead costs and expenses not allocated to the reporting segments.

Industry Peers

PAYX

Sector Peers

ALLE AME AOS AXON BA BLDR BR CARR CAT CHRW

S&P 500 Timeline

1981-03-31Joined S&P 500

Institutional Holdings (13F)

2,267 institutions hold ADP, totaling 436.3M shares ($90.8B) · As of 2026Q1

Rank	Institution	Shares	Value
1	VANGUARD CAPITAL MANAGEMENT LLC	52.3M	$10.6B
2	MORGAN STANLEY	28.8M	$7.5B
3	BlackRock, Inc.	35.5M	$7.2B
4	BARCLAYS PLC	23.2M	$5.9B
5	STATE STREET CORP	19.3M	$4.0B
6	GEODE CAPITAL MANAGEMENT, LLC	12.0M	$2.4B
7	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	11.6M	$2.3B
8	VANGUARD PORTFOLIO MANAGEMENT LLC	11.1M	$2.2B
9	WELLINGTON MANAGEMENT GROUP LLP	10.1M	$2.1B
10	GOLDMAN SACHS GROUP INC	8.7M	$2.0B

View all holders →

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