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ALLIANT ENERGY CORP (LNT)

Name: ALLIANT ENERGY CORP (LNT) — Institutional ownership, SEC filings and insider activity
Creator: Sightfile
License: https://www.sec.gov/privacy#dissemination

Institutional ownership, SEC filings and insider activity

Sector: Infrastructure & Utilities · SEC CIK 0000352541 · EDGAR filings · Updated 2026-07-14

ALLIANT ENERGY CORP (LNT) has reported institutional ownership of 92.5%, with 852 institutional managers holding positions valued at $17.1B per the latest 13F reporting period. SEC filings include an active material impairment disclosure (8-K Item 2.06).

Institutional ownership

92.5%

Institutional managers

852

Reported 13F value

$17.1B

Insider activity

24 trans.

$0 net flat

Data flags

1 active

from SEC filings

Latest updates

2026-07-14 — Insider transaction reported (Form 4)
2026-07-14 — Insider transaction reported (Form 4)
2026-07-14 — Insider transaction reported (Form 4)
2026-07-14 — Insider transaction reported (Form 4)
2026-07-14 — Insider transaction reported (Form 4)
2026-07-14 — Insider transaction reported (Form 4)
2026-07-14 — Insider transaction reported (Form 4)
2026-07-14 — Insider transaction reported (Form 4)

Institutional ownership overview

According to SEC 13F filings tracked by Sightfile, ALLIANT ENERGY CORP has 852 institutional holders and institutional ownership of 92.5%.

#	Institution	Reported value	% of tracked total
1	BlackRock, Inc.	$1.76B	10.3%
2	STATE STREET CORP	$1.22B	7.1%
3	VANGUARD CAPITAL MANAGEMENT LLC	$1.20B	7.0%
4	VANGUARD PORTFOLIO MANAGEMENT LLC	$1.05B	6.1%
5	JANUS HENDERSON GROUP PLC	$809.0M	4.7%
6	PRICE T ROWE ASSOCIATES INC /MD/	$761.4M	4.4%
7	Nuveen, LLC	$533.9M	3.1%
8	VICTORY CAPITAL MANAGEMENT INC	$519.5M	3.0%
9	GEODE CAPITAL MANAGEMENT, LLC	$519.0M	3.0%
10	MASSACHUSETTS FINANCIAL SERVICES CO /MA/	$509.9M	3.0%

Full holder history and quarter-over-quarter changes are available inside the app.

Insider activity

Insiders reported 24 transactions (0 buys, 0 sells) across 9 reporting insiders, with a net reported value of $0.

Data flags from SEC filings

Active material impairment disclosure (8-K Item 2.06), most recently filed 2024-06-24 (recurring since 2024-06-24) — source filing. The authoritative details are those stated in the filing itself.

Related companies

NISOURCE INC (NI) · ENERGY TRANSFER L P (ET) · EVERGY INC (EVRG) · CHENIERE ENERGY PARTNERS L P (CQP) · TALEN ENERGY CORP (TLN) · FORTIS INC (FTS)

See full history, cross-references and alerts on Sightfile

Sightfile provides information only — not investment advice, recommendations, or an assessment of any security. Data is derived from official public sources (SEC EDGAR and U.S. government agencies), may contain errors or delays, and should be verified against the source filing before relying on it.
Data sources: SEC EDGAR (filings, 13F, FTD), aggregated by Sightfile. Page updated 2026-07-14.