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 ($77.7m this quarter). Holder counts are more reliable. Shares outstanding: 257.0m as of 2025-06-30, 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 ≈ $60.44. Options: 8 managers hold calls ($37.8m notional), 5 hold puts ($979.0k).
Trends to Q2 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 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2023 | 272 | 289 |
| Q4 2023 | 287 | 280 |
| Q1 2024 | 298 | 315 |
| Q2 2024 | 310 | 267 |
| Q3 2024 | 337 | 272 |
| Q4 2024 | 331 | 270 |
| Q1 2025 | 394 | 284 |
| Q2 2025 | 395 | 314 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2024 | $10.7m | $6.3m | 0.59 |
| Q4 2024 | $3.5m | $3.0m | 0.84 |
| Q1 2025 | $39.6m | $10.3m | 0.26 |
| Q2 2025 | $37.8m | $979.0k | 0.03 |
Biggest buyers
| Nuveen, LLC | Added | +2.1m |
| Balyasny Asset Management L.P. | New | +1.4m |
| MILLENNIUM MANAGEMENT LLC | Added | +1.1m |
| JPMORGAN CHASE & CO | Added | +525.4k |
| REAVES W H & CO INC | Added | +500.6k |
| VANGUARD GROUP INC | Added | +481.5k |
| Yaupon Capital Management LP | New | +473.6k |
| MARSHALL WACE, LLP | Added | +471.4k |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | Added | +384.2k |
| ROYAL BANK OF CANADA | Added | +369.2k |
Biggest sellers
| COHEN & STEERS, INC. | Reduced | -1.3m |
| Thrivent Financial for Lutherans | Reduced | -744.1k |
| VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. | Reduced | -669.4k |
| VICTORY CAPITAL MANAGEMENT INC | Reduced | -606.7k |
| T. Rowe Price Investment Management, Inc. | Reduced | -530.9k |
| UBS Group AG | Reduced | -390.9k |
| FIRST TRUST ADVISORS LP | Reduced | -382.6k |
| AE Wealth Management LLC | Reduced | -258.5k |
| Pictet Asset Management Holding SA | Reduced | -246.7k |
| D. E. Shaw & Co., Inc. | Sold out | -241.7k |
Biggest calls
| UBS Group AG | Added | $29.0m479.4k shares |
| Walleye Trading LLC | Added | $4.9m81.0k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $1.9m31.8k shares |
| CITADEL ADVISORS LLC | Reduced | $1.3m22.0k shares |
| JANE STREET GROUP, LLC | New | $550.3k9.1k shares |
| SIMPLEX TRADING, LLC | Added | $96.0k1.6k shares |
| GROUP ONE TRADING LLC | Added | $12.1k200 shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $459.6k7.6k shares |
| CITADEL ADVISORS LLC | Reduced | $417.2k6.9k shares |
| SIMPLEX TRADING, LLC | Reduced | $84.0k1.4k shares |
| Walleye Trading LLC | Added | $18.1k300 shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 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 Q2 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 |
|---|---|---|---|---|---|
| Q3 2023 | 0 | — | 0 | — | — |
| Q4 2023 | 0 | — | 0 | — | — |
| 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 | — | — |
None reported in Q2 2025.
Holders, Q2 2025
| Manager | Shares | Change |
|---|---|---|
| VANGUARD GROUP INC 0.03% of their portfolio | 33.3m $2.0bn | Added +481.5k |
| BlackRock, Inc. 0.03% of their portfolio | 23.8m $1.4bn | Added +178.5k |
| STATE STREET CORP 0.04% of their portfolio | 16.7m $1.0bn | Added +350.6k |
| JANUS HENDERSON GROUP PLC 0.32% of their portfolio | 10.8m $651.6m | Reduced -92.4k |
| VICTORY CAPITAL MANAGEMENT INC 0.39% of their portfolio | 10.0m $603.7m | Reduced -606.7k |
| Nuveen, LLC 0.14% of their portfolio | 8.4m $505.9m | Added +2.1m |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.14% of their portfolio | 7.1m $428.3m | Added +384.2k |
| GEODE CAPITAL MANAGEMENT, LLC 0.03% of their portfolio | 6.8m $412.5m | Reduced -53.1k |
| Invesco Ltd. 0.05% of their portfolio | 4.9m $294.2m | Added +230.5k |
| FRANKLIN RESOURCES INC 0.06% of their portfolio | 3.7m $222.3m | Added +8.6k |
| MORGAN STANLEY 0.01% of their portfolio | 3.5m $211.4m | Added +31.2k |
| BANK OF AMERICA CORP /DE/ 0.02% of their portfolio | 3.2m $193.5m | Added +43.8k |
| Pictet Asset Management Holding SA 0.19% of their portfolio | 3.2m $191.1m | Reduced -246.7k |
| MAIRS & POWER INC 1.82% of their portfolio | 3.0m $184.0m | Reduced -2.5k |
| Legal & General Group Plc 0.04% of their portfolio | 2.4m $143.2m | Added +149.7k |
| NORTHERN TRUST CORP 0.02% of their portfolio | 2.3m $139.9m | Reduced -128.7k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.02% of their portfolio | 2.3m $138.6m | Added +21.0k |
| Bank of New York Mellon Corp 0.02% of their portfolio | 1.9m $116.8m | Reduced -86.5k |
| JOHNSON INVESTMENT COUNSEL INC 1.05% of their portfolio | 1.9m $116.4m | Added +51.8k |
| DUFF & PHELPS INVESTMENT MANAGEMENT CO 1.36% of their portfolio | 1.9m $115.3m | Reduced -9.2k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.02% of their portfolio | 1.8m $106.6m | Added +20.9k |
| NEUBERGER BERMAN GROUP LLC 0.08% of their portfolio | 1.7m $104.2m | Added +68.8k |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 1.5m $88.2m | Added +525.4k |
| Thrivent Financial for Lutherans 0.18% of their portfolio | 1.4m $82.3m | Reduced -744.1k |
| Balyasny Asset Management L.P. 0.19% of their portfolio | 1.4m $82.3m | New |
| DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio | 1.3m $80.4m | Added +21.0k |
| FIRST TRUST ADVISORS LP 0.06% of their portfolio | 1.3m $76.1m | Reduced -382.6k |
| MILLENNIUM MANAGEMENT LLC 0.07% of their portfolio | 1.2m $72.8m | Added +1.1m |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 1.2m $69.8m | Added +70.4k |
| REAVES W H & CO INC 1.55% of their portfolio | 1.2m $69.7m | Added +500.6k |
| MARSHALL WACE, LLP 0.07% of their portfolio | 1.0m $61.3m | Added +471.4k |
| PRINCIPAL FINANCIAL GROUP INC 0.03% of their portfolio | 1.0m $60.7m | Reduced -130.0k |
| Artisan Partners Limited Partnership 0.09% of their portfolio | 998.6k $60.4m | Reduced -12.3k |
| COHEN & STEERS, INC. 0.10% of their portfolio | 945.7k $57.2m | Reduced -1.3m |
| California Public Employees Retirement System 0.04% of their portfolio | 932.7k $56.4m | Reduced -209.5k |
| UBS Group AG 0.01% of their portfolio | 917.8k $55.5m | Reduced -390.9k |
| ROYAL BANK OF CANADA 0.01% of their portfolio | 854.4k $51.7m | Added +369.2k |
| ANCHOR CAPITAL ADVISORS LLC 1.42% of their portfolio | 802.7k $48.5m | Reduced -15.0k |
| VAUGHAN DAVID INVESTMENTS LLC/IL 1.05% of their portfolio | 777.6k $47.0m | Added +9.7k |
| Swiss National Bank 0.03% of their portfolio | 777.5k $47.0m | Added +53.8k |
| Energy Income Partners, LLC 0.91% of their portfolio | 765.7k $46.3m | Added +425 |
| LPL Financial LLC 0.01% of their portfolio | 737.3k $44.6m | Added +97.2k |
| T. Rowe Price Investment Management, Inc. 0.03% of their portfolio | 733.2k $44.3m | Reduced -530.9k |
| ALLIANCEBERNSTEIN L.P. 0.01% of their portfolio | 730.9k $44.2m | Added +157.0k |
| JENNISON ASSOCIATES LLC 0.03% of their portfolio | 721.5k $43.6m | Added +183.8k |
| ENVESTNET ASSET MANAGEMENT INC 0.01% of their portfolio | 712.3k $43.1m | Added +13.9k |
| DEUTSCHE BANK AG\ 0.01% of their portfolio | 663.1k $40.1m | Reduced -132.7k |
| BARCLAYS PLC 0.02% of their portfolio | 642.5k $38.8m | Reduced -29.8k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.03% of their portfolio | 619.9k $37.5m | Added +270.2k |
| VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. 0.35% of their portfolio | 612.6k $37.0m | Reduced -669.4k |
| REGIONS FINANCIAL CORP 0.25% of their portfolio | 603.4k $36.5m | Reduced -13.5k |
| Bahl & Gaynor LLC 0.18% of their portfolio | 601.3k $36.4m | Added +127.2k |
| Sumitomo Mitsui Trust Group, Inc. 0.02% of their portfolio | 599.8k $36.3m | Reduced -6.4k |
| Carnegie Investment Counsel 0.73% of their portfolio | 598.3k $36.2m | Added +66.7k |
| RHUMBLINE ADVISERS 0.03% of their portfolio | 558.8k $33.8m | Added +12.7k |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS 0.17% of their portfolio | 539.8k $32.6m | Added +50.7k |
| Verition Fund Management LLC 0.19% of their portfolio | 535.5k $32.4m | Added +291.0k |
| BI Asset Management Fondsmaeglerselskab A/S 0.29% of their portfolio | 530.5k $29.1m | Reduced -1.1k |
| LIBERTY ONE INVESTMENT MANAGEMENT, LLC 3.14% of their portfolio | 513.8k $31.1m | Reduced -25.3k |
| WELLS FARGO & COMPANY/MN 0.01% of their portfolio | 491.9k $29.7m | Added +4.4k |
| Mitsubishi UFJ Asset Management Co., Ltd. 0.02% of their portfolio | 484.6k $29.3m | Added +20.0k |
| Yaupon Capital Management LP 1.90% of their portfolio | 473.6k $28.6m | New |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.03% of their portfolio | 469.5k $28.4m | Reduced -4.7k |
| Retirement Systems of Alabama 0.10% of their portfolio | 439.3k $26.6m | Reduced -6.7k |
| HITE Hedge Asset Management LLC 1.50% of their portfolio | 432.4k $26.2m | Added +135.0k |
| HSBC HOLDINGS PLC 0.02% of their portfolio | 410.1k $24.8m | Reduced -12.9k |
| Hudson Bay Capital Management LP 0.16% of their portfolio | 406.3k $24.6m | Added +107.1k |
| BNP PARIBAS FINANCIAL MARKETS 0.02% of their portfolio | 403.5k $24.4m | Reduced -131.5k |
| PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO 0.09% of their portfolio | 396.6k $24.0m | Unchanged |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.04% of their portfolio | 385.3k $23.3m | Added +1.1k |
| GODSEY & GIBB, INC 2.12% of their portfolio | 374.2k $22.6m | Added +645 |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 369.8k $22.4m | Added +4.2k |
| Squarepoint Ops LLC 0.05% of their portfolio | 355.1k $21.5m | Added +262.2k |
| SCHRODER INVESTMENT MANAGEMENT GROUP 0.02% of their portfolio | 352.9k $21.3m | Reduced -4.8k |
| GABELLI FUNDS LLC 0.15% of their portfolio | 349.8k $21.2m | Added +124 |
| CITIGROUP INC 0.01% of their portfolio | 345.4k $20.9m | Added +68.2k |
| Russell Investments Group, Ltd. 0.03% of their portfolio | 331.4k $20.0m | Reduced -9.0k |
| FMR LLC 0.00% of their portfolio | 329.5k $19.9m | Reduced -187.2k |
| Qube Research & Technologies Ltd 0.03% of their portfolio | 311.3k $18.8m | Added +182.0k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.02% of their portfolio | 306.5k $18.5m | Added +2.9k |
| Amundi 0.01% of their portfolio | 299.0k $18.2m | Added +24.7k |
| RAYMOND JAMES FINANCIAL INC 0.01% of their portfolio | 293.0k $17.7m | Reduced -47.0k |
| PRUDENTIAL FINANCIAL INC 0.02% of their portfolio | 292.2k $17.7m | Added +123.3k |
| GATEWAY INVESTMENT ADVISERS LLC 0.19% of their portfolio | 289.2k $17.5m | Unchanged |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.03% of their portfolio | 276.3k $16.7m | Added +2.8k |
| APG Asset Management N.V. 0.04% of their portfolio | 275.7k $14.2m | Added +135.5k |
| Point72 Asset Management, L.P. 0.04% of their portfolio | 271.2k $16.4m | New |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.03% of their portfolio | 269.4k $16.3m | Added +141 |
| Greenland Capital Management LP 2.05% of their portfolio | 263.6k $15.9m | Added +125.1k |
| NATIXIS ADVISORS, LLC 0.02% of their portfolio | 259.9k $15.7m | Reduced -45.6k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 251.1k $15.2m | Reduced -7.6k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.04% of their portfolio | 247.2k $15.0m | Added +30.2k |
| Epoch Investment Partners, Inc. 0.07% of their portfolio | 233.6k $14.1m | Reduced -11.6k |
| Susquehanna Portfolio Strategies, LLC 0.28% of their portfolio | 209.5k $12.7m | Added +178.8k |
| CIBC Private Wealth Group LLC 0.02% of their portfolio | 208.1k $12.6m | Added +43.9k |
| Holocene Advisors, LP 0.03% of their portfolio | 206.3k $12.5m | Added +119.3k |
| Gotham Asset Management, LLC 0.07% of their portfolio | 206.2k $12.5m | Reduced -9.8k |
| Connor, Clark & Lunn Investment Management Ltd. 0.04% of their portfolio | 204.6k $12.4m | Added +69.3k |
| CIBC Asset Management Inc 0.04% of their portfolio | 202.8k $12.3m | Added +44.6k |
| NISA INVESTMENT ADVISORS, LLC 0.05% of their portfolio | 197.2k $11.9m | Added +251 |