When did AEE join the S&P 500?

Ameren joined the S&P 500 index on 1991-09-19.

What sector is AEE in?

AEE is in the Utilities sector, Multi-Utilities industry.

AEE — Ameren

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

Multi-Utilities · Utilities

Key Facts

Status	Active
Sector	Utilities
Industry	Multi-Utilities
Joined	1991-09-19
Tenure	34 yrs

Ameren owns regulated generation, transmission, and distribution networks, delivering electricity and natural gas through its two primary subsidiaries, Ameren Missouri and Ameren Illinois. It serves 2.5 million electric customers and 800,000 natural gas customers across its two service territories.

Industry Peers

CMS CNP D DTE ED NEE NI PCG PNW SRE

Sector Peers

AEP AES ATO AWK CEG CMS CNP D DTE DUK

S&P 500 Timeline

1991-09-19Joined S&P 500

Institutional Holdings (13F)

926 institutions hold AEE, totaling 276.2M shares ($26.2B) · As of 2026Q1

Rank	Institution	Shares	Value
1	VANGUARD CAPITAL MANAGEMENT LLC	35.9M	$3.9B
2	BlackRock, Inc.	23.8M	$2.6B
3	VANGUARD PORTFOLIO MANAGEMENT LLC	15.8M	$1.7B
4	STATE STREET CORP	14.9M	$1.6B
5	JANUS HENDERSON GROUP PLC	10.7M	$1.2B
6	MORGAN STANLEY	8.8M	$926M
7	BARCLAYS PLC	10.0M	$914M
8	GEODE CAPITAL MANAGEMENT, LLC	7.7M	$839M
9	GOLDMAN SACHS GROUP INC	6.6M	$690M
10	AMERIPRISE FINANCIAL INC	6.3M	$690M

View all holders →

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