ALLIANT ENERGY CORP LNT
COM · Common Stock · CUSIP 018802108 · ISIN US0188021085
Public utility holding company based in Madison,WI, US
- SectorUtilities
- IndustryElectric & Other Services Combined
- HeadquartersMadison, WI
- Founded1981
- Websitealliantenergy.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($81.0m this quarter). Holder counts are more reliable. Shares outstanding: 257.1m as of 2026-01-31, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $65.00. Options: 5 managers hold calls ($8.0m notional), 5 hold puts ($1.2m).
Trends to Q4 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 627 |
| Q4 2022 | 661 |
| Q1 2023 | 637 |
| Q2 2023 | 635 |
| Q3 2023 | 615 |
| Q4 2023 | 653 |
| Q1 2024 | 630 |
| Q2 2024 | 659 |
| Q3 2024 | 680 |
| Q4 2024 | 718 |
| Q1 2025 | 778 |
| Q2 2025 | 775 |
| Q3 2025 | 790 |
| Q4 2025 | 834 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q1 2024 | 298 | 315 |
| Q2 2024 | 310 | 267 |
| Q3 2024 | 337 | 272 |
| Q4 2024 | 331 | 270 |
| Q1 2025 | 394 | 284 |
| Q2 2025 | 395 | 314 |
| Q3 2025 | 363 | 299 |
| Q4 2025 | 386 | 300 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q1 2025 | $39.6m | $10.3m | 0.26 |
| Q2 2025 | $37.8m | $979.0k | 0.03 |
| Q3 2025 | $12.9m | $2.4m | 0.19 |
| Q4 2025 | $8.0m | $1.2m | 0.15 |
Biggest buyers
| PRICE T ROWE ASSOCIATES INC /MD/ | Added | +7.5m |
| REAVES W H & CO INC | Added | +1.3m |
| COHEN & STEERS, INC. | Added | +1.1m |
| FMR LLC | Added | +896.5k |
| JENNISON ASSOCIATES LLC | Added | +867.3k |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | New | +769.5k |
| TORONTO DOMINION BANK | Added | +717.3k |
| Magellan Asset Management Ltd | Added | +626.7k |
| ExodusPoint Capital Management, LP | New | +577.4k |
| HSBC HOLDINGS PLC | Added | +460.0k |
Biggest sellers
| CITADEL ADVISORS LLC | Reduced | -3.6m |
| Nuveen, LLC | Reduced | -1.4m |
| Balyasny Asset Management L.P. | Reduced | -1.3m |
| MILLENNIUM MANAGEMENT LLC | Reduced | -1.2m |
| JPMORGAN CHASE & CO | Reduced | -1.2m |
| LIBERTY ONE INVESTMENT MANAGEMENT, LLC | Reduced | -600.6k |
| REGIONS FINANCIAL CORP | Reduced | -598.4k |
| VICTORY CAPITAL MANAGEMENT INC | Reduced | -544.1k |
| Verition Fund Management LLC | Reduced | -525.8k |
| MARSHALL WACE, LLP | Reduced | -452.5k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $4.4m68.4k shares |
| JANE STREET GROUP, LLC | Added | $2.3m35.2k shares |
| CITADEL ADVISORS LLC | Added | $903.6k13.9k shares |
| SIMPLEX TRADING, LLC | Added | $221.0k3.4k shares |
| Walleye Trading LLC | Reduced | $91.0k1.4k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $773.6k11.9k shares |
| Walleye Capital LLC | New | $182.0k2.8k shares |
| Walleye Trading LLC | Added | $104.0k1.6k shares |
| SIMPLEX TRADING, LLC | Added | $78.0k1.2k shares |
| GROUP ONE TRADING LLC | Added | $58.5k900 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-29 | 7.5% |
| VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution new · filed 2026-04-28 | 5.7% |
Fell to 5% or below in the last year: VANGUARD GROUP INC (0.0%, 2026-03-26; now reported by VANGUARD CAPITAL MANAGEMENT LLC)
Insider purchases and sales in Q4 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q1 2024 | 2 | $77.5k | 0 | — | — |
| Q2 2024 | 0 | — | 0 | — | — |
| Q3 2024 | 0 | — | 0 | — | — |
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 0 | — | 0 | — | — |
None reported in Q4 2025.
Holders, Q4 2025
| Manager | Shares | Change |
|---|---|---|
| VANGUARD GROUP INC 0.03% of their portfolio | 33.8m $2.2bn | Added +383.6k |
| BlackRock, Inc. 0.03% of their portfolio | 24.3m $1.6bn | Added +293.9k |
| STATE STREET CORP 0.04% of their portfolio | 16.9m $1.1bn | Added +386.1k |
| JANUS HENDERSON GROUP PLC 0.32% of their portfolio | 11.1m $723.9m | Added +223.8k |
| VICTORY CAPITAL MANAGEMENT INC 0.31% of their portfolio | 8.6m $557.7m | Reduced -544.1k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.06% of their portfolio | 8.4m $545.7m | Added +7.5m |
| Nuveen, LLC 0.13% of their portfolio | 7.4m $480.6m | Reduced -1.4m |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.15% of their portfolio | 7.2m $466.4m | Added +167.6k |
| GEODE CAPITAL MANAGEMENT, LLC 0.03% of their portfolio | 7.1m $458.1m | Added +129.0k |
| Invesco Ltd. 0.03% of their portfolio | 4.7m $307.1m | Reduced -23.9k |
| Pictet Asset Management Holding SA 0.26% of their portfolio | 4.1m $264.5m | Added +215.2k |
| BANK OF AMERICA CORP /DE/ 0.02% of their portfolio | 3.7m $243.3m | Added +390.6k |
| FRANKLIN RESOURCES INC 0.06% of their portfolio | 3.7m $239.6m | Added +4.3k |
| COHEN & STEERS, INC. 0.42% of their portfolio | 3.6m $235.0m | Added +1.1m |
| MORGAN STANLEY 0.01% of their portfolio | 3.1m $200.5m | Reduced -67.1k |
| REAVES W H & CO INC 3.48% of their portfolio | 3.1m $198.8m | Added +1.3m |
| MAIRS & POWER INC 1.85% of their portfolio | 3.0m $192.2m | Reduced -36.7k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.02% of their portfolio | 2.3m $151.3m | Added +19.2k |
| FMR LLC 0.01% of their portfolio | 2.3m $150.3m | Added +896.5k |
| Legal & General Group Plc 0.03% of their portfolio | 2.2m $143.4m | Reduced -101.3k |
| Magellan Asset Management Ltd 1.72% of their portfolio | 2.2m $141.7m | Added +626.7k |
| NORTHERN TRUST CORP 0.02% of their portfolio | 2.1m $139.4m | Reduced -58.5k |
| JOHNSON INVESTMENT COUNSEL INC 1.05% of their portfolio | 2.0m $128.6m | Reduced -1.3k |
| DUFF & PHELPS INVESTMENT MANAGEMENT CO 1.40% of their portfolio | 1.9m $123.4m | Reduced -4.7k |
| JENNISON ASSOCIATES LLC 0.07% of their portfolio | 1.8m $117.4m | Added +867.3k |
| Bank of New York Mellon Corp 0.02% of their portfolio | 1.5m $99.3m | Reduced -404.8k |
| NEUBERGER BERMAN GROUP LLC 0.07% of their portfolio | 1.5m $98.8m | Reduced -130.7k |
| FIRST TRUST ADVISORS LP 0.07% of their portfolio | 1.5m $97.3m | Reduced -25.9k |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 1.5m $96.6m | Reduced -1.2m |
| DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio | 1.3m $87.1m | Reduced -6.0k |
| Thrivent Financial for Lutherans 0.14% of their portfolio | 1.2m $77.7m | Reduced -120.8k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.02% of their portfolio | 1.2m $76.3m | Reduced -62.7k |
| UBS Group AG 0.01% of their portfolio | 1.2m $74.8m | Added +368.5k |
| ALLIANCEBERNSTEIN L.P. 0.02% of their portfolio | 1.1m $71.4m | Added +202.4k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 1.1m $71.1m | Added +73.0k |
| Point72 Asset Management, L.P. 0.11% of their portfolio | 1.1m $70.9m | Reduced -21.8k |
| PRINCIPAL FINANCIAL GROUP INC 0.03% of their portfolio | 939.6k $61.1m | Reduced -4.0k |
| BARCLAYS PLC 0.02% of their portfolio | 897.5k $58.3m | Reduced -10.6k |
| TORONTO DOMINION BANK 0.10% of their portfolio | 890.2k $57.9m | Added +717.3k |
| VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. 0.55% of their portfolio | 869.7k $56.5m | Added +163.2k |
| HSBC HOLDINGS PLC 0.02% of their portfolio | 846.7k $55.1m | Added +460.0k |
| Energy Income Partners, LLC 0.94% of their portfolio | 802.3k $52.2m | Added +32.0k |
| LPL Financial LLC 0.01% of their portfolio | 794.7k $51.7m | Added +460 |
| ANCHOR CAPITAL ADVISORS LLC 1.47% of their portfolio | 778.7k $50.6m | Reduced -10.0k |
| VAUGHAN DAVID INVESTMENTS LLC/IL 1.09% of their portfolio | 770.0k $50.1m | Added +1.3k |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main 0.04% of their portfolio | 769.5k $50.0m | New |
| Swiss National Bank 0.03% of their portfolio | 704.2k $45.8m | Reduced -36.3k |
| ENVESTNET ASSET MANAGEMENT INC 0.01% of their portfolio | 697.5k $45.3m | Reduced -17.5k |
| Artisan Partners Limited Partnership 0.07% of their portfolio | 691.0k $44.9m | Reduced -241.2k |
| DEUTSCHE BANK AG\ 0.01% of their portfolio | 682.9k $44.4m | Added +8.7k |
| Bahl & Gaynor LLC 0.22% of their portfolio | 662.1k $43.0m | Reduced -13.3k |
| CITADEL ADVISORS LLC 0.03% of their portfolio | 652.6k $42.4m | Reduced -3.6m |
| California Public Employees Retirement System 0.02% of their portfolio | 644.2k $41.9m | Reduced -128.9k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.03% of their portfolio | 630.4k $41.0m | Added +139.1k |
| Carnegie Investment Counsel 0.74% of their portfolio | 613.7k $39.9m | Reduced -9.1k |
| Sumitomo Mitsui Trust Group, Inc. 0.02% of their portfolio | 602.1k $39.1m | Reduced -6.5k |
| REGIONS FINANCIAL CORP 0.24% of their portfolio | 588.5k $38.3m | Reduced -598.4k |
| ExodusPoint Capital Management, LP 0.42% of their portfolio | 577.4k $37.5m | New |
| Amundi 0.01% of their portfolio | 575.2k $37.4m | Added +68.2k |
| RHUMBLINE ADVISERS 0.03% of their portfolio | 563.9k $36.7m | Reduced -18.9k |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS 0.18% of their portfolio | 556.0k $36.1m | Reduced -1.9k |
| Mitsubishi UFJ Asset Management Co., Ltd. 0.02% of their portfolio | 541.7k $35.5m | Added +13.2k |
| D. E. Shaw & Co., Inc. 0.03% of their portfolio | 536.5k $34.9m | Added +451.5k |
| Hudson Bay Capital Management LP 0.20% of their portfolio | 531.6k $34.6m | Added +5.5k |
| HITE Hedge Asset Management LLC 2.08% of their portfolio | 500.6k $32.5m | Added +91.1k |
| T. Rowe Price Investment Management, Inc. 0.01% of their portfolio | 483.0k $31.4m | Reduced -16.2k |
| WELLS FARGO & COMPANY/MN 0.01% of their portfolio | 481.6k $31.3m | Reduced -66.3k |
| BNP PARIBAS FINANCIAL MARKETS 0.02% of their portfolio | 469.7k $30.5m | Added +36.6k |
| ROYAL BANK OF CANADA 0.01% of their portfolio | 454.9k $29.6m | Reduced -56.6k |
| Aventail Capital Group, LP 1.65% of their portfolio | 440.4k $28.6m | Added +195.6k |
| Retirement Systems of Alabama 0.09% of their portfolio | 438.8k $28.5m | Reduced -131 |
| Russell Investments Group, Ltd. 0.03% of their portfolio | 437.7k $28.5m | Reduced -23.3k |
| CITIGROUP INC 0.02% of their portfolio | 432.0k $28.1m | Added +142.8k |
| RENAISSANCE TECHNOLOGIES LLC 0.04% of their portfolio | 421.4k $27.4m | Added +161.0k |
| PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO 0.09% of their portfolio | 396.6k $25.8m | Unchanged |
| LIBERTY ONE INVESTMENT MANAGEMENT, LLC 3.19% of their portfolio | 384.2k $25.0m | Reduced -600.6k |
| GODSEY & GIBB, INC 2.16% of their portfolio | 370.0k $24.1m | Reduced -2.6k |
| GABELLI FUNDS LLC 0.16% of their portfolio | 352.9k $22.9m | Added +1.1k |
| Gotham Asset Management, LLC 0.08% of their portfolio | 352.4k $22.9m | Added +124.4k |
| SCHRODER INVESTMENT MANAGEMENT GROUP 0.02% of their portfolio | 340.8k $22.2m | Reduced -3.7k |
| GATEWAY INVESTMENT ADVISERS LLC 0.19% of their portfolio | 316.4k $20.6m | Added +26.6k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.02% of their portfolio | 304.7k $19.8m | Reduced -4.8k |
| Sourcerock Group LLC 1.11% of their portfolio | 299.5k $19.5m | Added +149.5k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 287.0k $18.7m | Added +59.2k |
| RAYMOND JAMES FINANCIAL INC 0.01% of their portfolio | 269.6k $17.5m | Added +2.8k |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.03% of their portfolio | 266.3k $17.3m | Reduced -2.6k |
| CIBC Private Wealth Group LLC 0.03% of their portfolio | 264.2k $17.2m | Added +120.0k |
| Assenagon Asset Management S.A. 0.02% of their portfolio | 255.4k $16.6m | Added +150.7k |
| MARSHALL WACE, LLP 0.02% of their portfolio | 253.9k $16.5m | Reduced -452.5k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.04% of their portfolio | 250.7k $16.3m | Added +8.7k |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.03% of their portfolio | 249.2k $16.2m | Reduced -6.2k |
| SEI INVESTMENTS CO 0.02% of their portfolio | 245.7k $16.0m | Added +50.7k |
| NATIXIS ADVISORS, LLC 0.02% of their portfolio | 243.4k $15.8m | Reduced -1.5k |
| TWO SIGMA INVESTMENTS, LP 0.02% of their portfolio | 240.9k $15.7m | Added +228.5k |
| CIBC Asset Management Inc 0.04% of their portfolio | 232.3k $15.1m | Added +24.2k |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) 0.39% of their portfolio | 224.2k $14.6m | Reduced -78.8k |
| Epoch Investment Partners, Inc. 0.08% of their portfolio | 218.5k $14.2m | Reduced -8.7k |
| BANK OF MONTREAL /CAN/ 0.01% of their portfolio | 210.9k $13.7m | Added +26.9k |
| NISA INVESTMENT ADVISORS, LLC 0.04% of their portfolio | 199.8k $13.0m | Added +2.2k |
| Resolution Capital Ltd 0.29% of their portfolio | 198.4k $12.9m | Added +79.6k |