When did AMT join the S&P 500?

American Tower joined the S&P 500 index on 2007-11-19.

What sector is AMT in?

AMT is in the Real Estate sector, Telecom Tower REITs industry.

AMT — American Tower

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

Telecom Tower REITs · Real Estate

American Tower (NYSE: AMT) is a leading independent owner, operator and developer of wireless and broadcast communications infrastructure. Our global portfolio includes over 160,000 sites with steady growth. Beyond tower space leasing, we provide customized configuration solutions, including rooftop hosting and accelerated network deployments through indoor systems, outdoor distributed antenna systems and other right-of-way options.

Key Facts

Status	Active
Sector	Real Estate
Industry	Telecom Tower REITs
Joined	2007-11-19
Tenure	18 yrs

S&P 500 Timeline

2007-11-19Joined S&P 500

Industry Peers

CCI SBAC

Sector Peers

ARE AVB BXP CBRE CCI CPT CSGP DLR DOC EQIX

Institutional Holdings (13F)

1,758 institutions hold AMT, totaling 523.3M shares ($87.3B) · As of 2026Q1

Rank	Institution	Shares	Value
1	VANGUARD CAPITAL MANAGEMENT LLC	60.7M	$10.5B
2	BlackRock, Inc.	45.0M	$7.8B
3	MORGAN STANLEY	29.4M	$5.3B
4	VANGUARD PORTFOLIO MANAGEMENT LLC	27.6M	$4.8B
5	STATE STREET CORP	21.4M	$3.7B
6	BARCLAYS PLC	14.6M	$2.9B
7	JPMORGAN CHASE & CO	15.1M	$2.6B
8	GEODE CAPITAL MANAGEMENT, LLC	13.9M	$2.4B
9	DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main	8.7M	$2.0B
10	FMR LLC	11.3M	$2.0B

View all holders →

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