Comparable stake leader
BlackRock, Inc.
SEC ownership of ALLIANT ENERGY CORP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000352541.
Disclosed value leader
BlackRock, Inc.
Comparable rows
0/50
Latest evidence
31 Mar 2026
- Public ticker
- LNT on Nasdaq
- Parsed ownership sources
-
13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000352541
- Issuer location
- Madison, WI
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
1 signal
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of ALLIANT ENERGY CORP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
0/50
Latest evidence
31 Mar 2026
13F
Highest disclosed value: $1,758,079,782
50 rows are not safely comparable across share classes.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. has the largest disclosed position value at $1.76B.
0 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Disclosed position value
Top 5
BlackRock, Inc.
$1.76B
STATE STREET CORP
$1.22B
VANGUARD CAPITAL MANAGEMENT LLC
$1.2B
VANGUARD PORTFOLIO MANAGEMENT LLC
$1.05B
Janus Henderson Group Ltd.
$809M
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13F
Company
|
—
class O/S missing
|
$1,758,079,782
24,499,440 shares
|
— | 31 Mar 2026 |
| STATE STREET CORP |
13F
Company
|
—
class O/S missing
|
$1,220,684,316
17,010,651 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
—
class O/S missing
|
$1,198,353,393
16,699,462 shares
|
— | 31 Mar 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
Company
|
—
class O/S missing
|
$1,047,337,631
14,595,006 shares
|
— | 31 Mar 2026 |
| Janus Henderson Group Ltd. |
13F
Company
|
—
class O/S missing
|
$808,995,539
11,273,621 shares
|
— | 31 Mar 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13F
Company
|
—
class O/S missing
|
$761,421,000
10,610,646 shares
|
— | 31 Mar 2026 |
| Nuveen, LLC |
13F
Company
|
—
class O/S missing
|
$533,922,064
7,440,386 shares
|
— | 31 Mar 2026 |
| VICTORY CAPITAL MANAGEMENT INC |
13F
Company
|
—
class O/S missing
|
$519,460,881
7,238,864 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 12 Aug 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 23 reporting-owner rows connected to ALLIANT ENERGY CORP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
23
Largest Forms 3/4/5 holder
John O Larsen
Net 12M change
$0
Latest report
10 Jul 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| John O Larsen | Director | $18,578,433 | Mixed | 20 Feb 2025 | ||
| Robert J. Durian | EVP and CFO | $11,372,380 | Mixed | 19 Feb 2026 | ||
| Lisa M. Barton | President and CEO, Director | $7,522,714 | Mixed | 19 Feb 2026 | ||
| David A. de Leon | Senior Vice President | $3,491,189 | Mixed | 19 Feb 2026 | ||
| James H. Gallegos | EVP, Gen Cnsl and Corp Sec | $3,126,281 | Mixed | 25 Feb 2022 | ||
| Patrick E. Allen | Director | $2,904,168 | Mixed | 10 Jul 2026 | ||
| Terry L. Kouba | Senior Vice President | $2,583,668 | Mixed | 15 Feb 2024 | ||
| Raja Sundararajan | Executive Vice President | $2,313,830 | Mixed | 19 Feb 2026 | ||
| Roger K. Newport | Director | $1,979,687 | Mixed | 10 Jul 2026 | ||
| Thomas F. Otoole | Director | $1,761,133 | Mixed | 13 Oct 2023 | ||
| Michael Dennis Garcia | Director | $1,606,048 | Mixed | 10 Jul 2026 | ||
| Antonio P. Smyth | Executive Vice President | $1,483,853 | Mixed | 15 Apr 2026 | ||
| Mayuri Farlinger | Vice President | $1,370,893 | Mixed | 19 Feb 2026 | ||
| Susan D. Whiting | Director | $1,255,210 | Mixed | 11 Jul 2023 | ||
| Nancy Joy Falotico | Director | $1,216,615 | Mixed | 10 Jul 2026 | ||
| Benjamin M. Bilitz | CAO and Controller | $1,196,676 | Mixed | 20 Feb 2025 | ||
| Stephanie Cox | Director | $1,078,128 | Mixed | 10 Jul 2026 | ||
| Ignacio A. Cortina | Director | $616,976 | Mixed | 10 Jul 2026 | ||
| Christie Raymond | Director | $486,743 | Mixed | 10 Jul 2026 | ||
| Dylan Syse | CAO and Controller | $281,443 | Mixed | 19 Feb 2026 |
Recent insider transactions for ALLIANT ENERGY CORP
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Patrick E. Allen | LNT | Deferred Common Stock Units | Award | 1.07% | 491 | 46,349 | 10 Jul 2026 | Direct | ||
| Ignacio A. Cortina | LNT | Deferred Common Stock Units | Award | 6.19% | 638 | 10,943 | 10 Jul 2026 | Direct | ||
| Stephanie Cox | LNT | Deferred Common Stock Units | Award | 3.01% | 524 | 17,907 | 10 Jul 2026 | Direct | ||
| Nancy Joy Falotico | LNT | Deferred Common Stock Units | Award | 3.76% | 744 | 20,523 | 10 Jul 2026 | Direct | ||
| Michael Dennis Garcia | LNT | Deferred Common Stock Units | Award | 3.23% | 838 | 26,794 | 10 Jul 2026 | Direct | ||
| Roger K. Newport | LNT | Deferred Common Stock Units | Award | 2.32% | 736 | 32,420 | 10 Jul 2026 | Direct | ||
| Christie Raymond | LNT | Deferred Common Stock Units | Award | 11.5% | 998 | 9,648 | 10 Jul 2026 | Direct | ||
| Manu Asthana | LNT | Deferred Common Stock Units | Award | 998 | 998 | 10 Jul 2026 | Direct | |||
| Antonio P. Smyth | LNT | Common Stock | Tax liability | -5.74% | -1,259 | 20,678 | 15 Apr 2026 | Direct | ||
| Patrick E. Allen | LNT | Deferred Common Stock Units | Award | 1.14% | 513 | 45,515 | 10 Apr 2026 | Direct | ||
| Ignacio A. Cortina | LNT | Deferred Common Stock Units | Award | 6.98% | 667 | 10,227 | 10 Apr 2026 | Direct | ||
| Stephanie Cox | LNT | Deferred Common Stock Units | Award | 3.28% | 547 | 17,253 | 10 Apr 2026 | Direct | ||
| Nancy Joy Falotico | LNT | Deferred Common Stock Units | Award | 4.13% | 778 | 19,630 | 10 Apr 2026 | Direct | ||
| Michael Dennis Garcia | LNT | Deferred Common Stock Units | Award | 3.52% | 876 | 25,762 | 10 Apr 2026 | Direct | ||
| Roger K. Newport | LNT | Deferred Common Stock Units | Award | 2.51% | 769 | 31,446 | 10 Apr 2026 | Direct | ||
| Christie Raymond | LNT | Deferred Common Stock Units | Award | 13.8% | 1,043 | 8,585 | 10 Apr 2026 | Direct | ||
| Rebecca C. Valcq | LNT | Common Stock | Tax liability | -15.8% | -438 | 2,335 | 19 Feb 2026 | Direct | ||
| Lisa M. Barton | LNT | Common Stock | Tax liability | -21% | -28,594 | 107,452 | 19 Feb 2026 | Direct | ||
| Lisa M. Barton | LNT | Common Stock | Award | 130.6% | 77,060 | 136,046 | 19 Feb 2026 | Direct | ||
| David A. de Leon | LNT | Common Stock | Tax liability | -9.84% | -5,207 | 47,708 | 19 Feb 2026 | Direct | ||
| David A. de Leon | LNT | Common Stock | Award | 26% | 10,922 | 52,915 | 19 Feb 2026 | Direct | ||
| Robert J. Durian | LNT | Common Stock | Tax liability | -9.57% | -16,630 | 157,126 | 19 Feb 2026 | Direct | ||
| Robert J. Durian | LNT | Common Stock | Award | 24.2% | 33,832 | 173,756 | 19 Feb 2026 | Direct | ||
| Mayuri Farlinger | LNT | Common Stock | Tax liability | -10.2% | -1,179 | 10,432 | 19 Feb 2026 | Direct | ||
| Mayuri Farlinger | LNT | Common Stock | Award | 55.1% | 4,124 | 11,611 | 19 Feb 2026 | Direct | ||
| Antonio P. Smyth | LNT | Common Stock | Tax liability | -22.2% | -6,226 | 21,855 | 19 Feb 2026 | Direct | ||
| Antonio P. Smyth | LNT | Common Stock | Award | 188.7% | 18,354 | 28,081 | 19 Feb 2026 | Direct | ||
| Raja Sundararajan | LNT | Common Stock . | Tax liability | -25.5% | -11,324 | 33,050 | 19 Feb 2026 | Direct | ||
| Raja Sundararajan | LNT | Common Stock . | Award | 163.8% | 27,552 | 44,374 | 19 Feb 2026 | Direct | ||
| Dylan Syse | LNT | Common Stock | Tax liability | -11.2% | -506 | 4,020 | 19 Feb 2026 | Direct | ||
| Dylan Syse | LNT | Common Stock | Award | 66.8% | 1,813 | 4,526 | 19 Feb 2026 | Direct | ||
| Patrick E. Allen | LNT | Deferred Common Stock Units | Award | 1.31% | 577 | 44,666 | 09 Jan 2026 | Direct | ||
| Ignacio A. Cortina | LNT | Deferred Common Stock Units | Award | 8.58% | 750 | 9,489 | 09 Jan 2026 | Direct | ||
| Stephanie Cox | LNT | Deferred Common Stock Units | Award | 3.85% | 615 | 16,581 | 09 Jan 2026 | Direct | ||
| Nancy Joy Falotico | LNT | Deferred Common Stock Units | Award | 4.9% | 875 | 18,711 | 09 Jan 2026 | Direct | ||
| Michael Dennis Garcia | LNT | Deferred Common Stock Units | Award | 4.15% | 984 | 24,701 | 09 Jan 2026 | Direct | ||
| Roger K. Newport | LNT | Deferred Common Stock Units | Award | 2.92% | 865 | 30,447 | 09 Jan 2026 | Direct | ||
| Christie Raymond | LNT | Deferred Common Stock Units | Award | 18.6% | 1,173 | 7,486 | 09 Jan 2026 | Direct | ||
| Roger K. Newport | LNT | Deferred Common Stock Units | Award | 2.81% | 803 | 29,363 | 10 Oct 2025 | Direct | ||
| Michael Dennis Garcia | LNT | Deferred Common Stock Units | Award | 4.04% | 915 | 23,541 | 10 Oct 2025 | Direct | ||
| Christie Raymond | LNT | Deferred Common Stock Units | Award | 21% | 1,089 | 6,267 | 10 Oct 2025 | Direct | ||
| Nancy Joy Falotico | LNT | Deferred Common Stock Units | Award | 5.18% | 872 | 17,705 | 10 Oct 2025 | Direct | ||
| Stephanie Cox | LNT | Deferred Common Stock Units | Award | 7.24% | 1,070 | 15,848 | 10 Oct 2025 | Direct | ||
| Ignacio A. Cortina | LNT | Deferred Common Stock Units | Award | 8.72% | 696 | 8,675 | 10 Oct 2025 | Direct |
* marks a reported price that did not pass the local price check.