When did LNT join the S&P 500?

Alliant Energy Corp joined the S&P 500 index on 2016-07-01.

What sector is LNT in?

LNT is in the Utilities sector, Electric Utilities industry.

LNT — Alliant Energy Corp

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

Electric Utilities · Utilities

S&P 500 Timeline

2016-07-01Joined S&P 500

Allete is a regulated, investor-owned utility holding company that provides regulated electricity and natural gas services to natural gas customers in the Midwest through its two utility subsidiaries. It operates through the following segments: Electric Utility, Natural Gas Utility, Other Utilities, Non-Utility, and Other.

Key Facts

Status	Active
Sector	Utilities
Industry	Electric Utilities
Joined	2016-07-01
Tenure	10 yrs

Industry Peers

AEP CEG DUK EIX ES ETR EVRG EXC FE PEG

Sector Peers

AEE AEP AES ATO AWK CEG CMS CNP D DTE

Institutional Holdings (13F)

860 institutions hold LNT, totaling 353.1M shares ($19.0B) · As of 2026Q1

Rank	Institution	Shares	Value
1	VANGUARD CAPITAL MANAGEMENT LLC	33.4M	$2.4B
2	BlackRock, Inc.	24.5M	$1.8B
3	JANUS HENDERSON GROUP PLC	22.5M	$1.6B
4	STATE STREET CORP	17.0M	$1.2B
5	VANGUARD PORTFOLIO MANAGEMENT LLC	14.6M	$1.0B
6	MORGAN STANLEY	15.4M	$660M
7	Nuveen, LLC	7.4M	$534M
8	VICTORY CAPITAL MANAGEMENT INC	7.2M	$519M
9	GEODE CAPITAL MANAGEMENT, LLC	7.3M	$519M
10	MASSACHUSETTS FINANCIAL SERVICES CO /MA/	7.0M	$510M

View all holders →

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