When did AEP join the S&P 500?

American Electric Power joined the S&P 500 index on 1957-03-04.

What sector is AEP in?

AEP is in the Utilities sector, Electric Utilities industry.

AEP — American Electric Power

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

Electric Utilities · Utilities

American Electric Power (AEP) is engaged in the generation, transmission, and distribution of electricity. The company operates through the following segments: Vertically Integrated Utilities, Transmission and Distribution Utilities, AEP Transmission HoldCo, and Generation and Marketing. The Vertically Integrated Utilities segment includes electricity generation, transmission, and distribution, with sales to retail and wholesale customers. The Transmission and Distribution Utilities segment provides transmission and distribution services to retail and wholesale customers. AEP Transmission HoldCo invests in its wholly-owned transmission subsidiaries and joint ventures, including the development, construction, and operation of transmission facilities. The Generation and Marketing segment includes non-regulated generation and marketing, risk management, and retail activities.

Key Facts

Status	Active
Sector	Utilities
Industry	Electric Utilities
Joined	1957-03-04
Tenure	69 yrs

S&P 500 Timeline

1957-03-04Joined S&P 500

Industry Peers

CEG DUK EIX ES ETR EVRG EXC FE LNT PEG

Sector Peers

AEE AES ATO AWK CEG CMS CNP D DTE DUK

Institutional Holdings (13F)

1 institutions hold AEP, totaling 27K shares ($3486) · As of 2026Q1

Rank	Institution	Shares	Value
1	Capital Innovations LLC	27K	$3486

View all holders →

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