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 ($75.6m this quarter). Holder counts are more reliable. Shares outstanding: 257.1m as of 2025-09-30, 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 ≈ $67.40. Options: 8 managers hold calls ($12.9m notional), 6 hold puts ($2.4m).
Trends to Q3 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 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| 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 |
| Q3 2025 | 363 | 299 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q4 2024 | $3.5m | $3.0m | 0.84 |
| Q1 2025 | $39.6m | $10.3m | 0.26 |
| Q2 2025 | $37.8m | $979.0k | 0.03 |
| Q3 2025 | $12.9m | $2.4m | 0.19 |
Biggest buyers
| CITADEL ADVISORS LLC | Added | +4.2m |
| COHEN & STEERS, INC. | Added | +1.6m |
| Magellan Asset Management Ltd | Added | +1.4m |
| JPMORGAN CHASE & CO | Added | +1.2m |
| FMR LLC | Added | +1.1m |
| Point72 Asset Management, L.P. | Added | +841.5k |
| Pictet Asset Management Holding SA | Added | +692.6k |
| REAVES W H & CO INC | Added | +626.4k |
| REGIONS FINANCIAL CORP | Added | +583.4k |
| PRICE T ROWE ASSOCIATES INC /MD/ | Added | +563.6k |
Biggest sellers
| VICTORY CAPITAL MANAGEMENT INC | Reduced | -860.5k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Sold out | -619.9k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | Reduced | -526.6k |
| BI Asset Management Fondsmaeglerselskab A/S | Reduced | -518.1k |
| MORGAN STANLEY | Reduced | -343.7k |
| ROYAL BANK OF CANADA | Reduced | -342.9k |
| Qube Research & Technologies Ltd | Sold out | -311.3k |
| MARSHALL WACE, LLP | Reduced | -307.9k |
| Squarepoint Ops LLC | Reduced | -246.7k |
| STATE STREET CORP | Reduced | -238.9k |
Biggest calls
| Walleye Trading LLC | Added | $5.6m83.6k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $5.6m82.4k shares |
| JANE STREET GROUP, LLC | Added | $660.6k9.8k shares |
| CITADEL ADVISORS LLC | Reduced | $525.8k7.8k shares |
| WOLVERINE TRADING, LLC | New | $293.8k4.4k shares |
| SIMPLEX TRADING, LLC | Added | $168.0k2.5k shares |
| GROUP ONE TRADING LLC | Added | $33.7k500 shares |
| BARCLAYS PLC | New | $13.5k200 shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $1.3m19.9k shares |
| WOLVERINE TRADING, LLC | New | $674.5k10.1k shares |
| CITADEL ADVISORS LLC | Reduced | $310.1k4.6k shares |
| SIMPLEX TRADING, LLC | Reduced | $40.0k600 shares |
| Walleye Trading LLC | Added | $27.0k400 shares |
| GROUP ONE TRADING LLC | New | $6.7k100 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 Q3 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 |
|---|---|---|---|---|---|
| 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 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
None reported in Q3 2025.
Holders, Q3 2025
| Manager | Shares | Change |
|---|---|---|
| VANGUARD GROUP INC 0.03% of their portfolio | 33.4m $2.3bn | Added +98.0k |
| BlackRock, Inc. 0.03% of their portfolio | 24.0m $1.6bn | Added +254.1k |
| STATE STREET CORP 0.04% of their portfolio | 16.5m $1.1bn | Reduced -238.9k |
| JANUS HENDERSON GROUP PLC 0.34% of their portfolio | 10.9m $735.5m | Added +135.6k |
| VICTORY CAPITAL MANAGEMENT INC 0.36% of their portfolio | 9.1m $615.0m | Reduced -860.5k |
| Nuveen, LLC 0.16% of their portfolio | 8.8m $591.3m | Added +406.2k |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.15% of their portfolio | 7.0m $472.3m | Reduced -75.7k |
| GEODE CAPITAL MANAGEMENT, LLC 0.03% of their portfolio | 6.9m $466.2m | Added +95.1k |
| Invesco Ltd. 0.05% of their portfolio | 4.7m $320.0m | Reduced -117.6k |
| CITADEL ADVISORS LLC 0.23% of their portfolio | 4.3m $289.1m | Added +4.2m |
| Pictet Asset Management Holding SA 0.25% of their portfolio | 3.9m $259.7m | Added +692.6k |
| FRANKLIN RESOURCES INC 0.06% of their portfolio | 3.7m $248.1m | Added +4.5k |
| BANK OF AMERICA CORP /DE/ 0.02% of their portfolio | 3.4m $225.9m | Added +152.1k |
| MORGAN STANLEY 0.01% of their portfolio | 3.2m $212.4m | Reduced -343.7k |
| MAIRS & POWER INC 1.90% of their portfolio | 3.0m $201.8m | Reduced -48.5k |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 2.6m $177.7m | Added +1.2m |
| COHEN & STEERS, INC. 0.31% of their portfolio | 2.6m $172.0m | Added +1.6m |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.02% of their portfolio | 2.3m $155.6m | Added +17.1k |
| Legal & General Group Plc 0.03% of their portfolio | 2.3m $155.5m | Reduced -62.4k |
| NORTHERN TRUST CORP 0.02% of their portfolio | 2.2m $148.5m | Reduced -110.9k |
| JOHNSON INVESTMENT COUNSEL INC 1.12% of their portfolio | 2.0m $133.5m | Added +55.5k |
| Bank of New York Mellon Corp 0.02% of their portfolio | 1.9m $130.2m | Reduced -398 |
| DUFF & PHELPS INVESTMENT MANAGEMENT CO 1.45% of their portfolio | 1.9m $128.3m | Reduced -3.6k |
| REAVES W H & CO INC 2.14% of their portfolio | 1.8m $119.9m | Added +626.4k |
| NEUBERGER BERMAN GROUP LLC 0.08% of their portfolio | 1.7m $111.3m | Reduced -72.5k |
| Magellan Asset Management Ltd 1.24% of their portfolio | 1.6m $104.7m | Added +1.4m |
| FIRST TRUST ADVISORS LP 0.08% of their portfolio | 1.5m $102.6m | Added +263.6k |
| FMR LLC 0.00% of their portfolio | 1.4m $95.4m | Added +1.1m |
| Balyasny Asset Management L.P. 0.18% of their portfolio | 1.4m $91.2m | Reduced -7.1k |
| DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio | 1.3m $90.7m | Added +14.8k |
| Thrivent Financial for Lutherans 0.17% of their portfolio | 1.3m $88.7m | Reduced -45.6k |
| MILLENNIUM MANAGEMENT LLC 0.07% of their portfolio | 1.3m $87.6m | Added +94.5k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.02% of their portfolio | 1.2m $83.3m | Reduced -526.6k |
| REGIONS FINANCIAL CORP 0.26% of their portfolio | 1.2m $80.0m | Added +583.4k |
| Point72 Asset Management, L.P. 0.16% of their portfolio | 1.1m $75.0m | Added +841.5k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 1.0m $68.8m | Reduced -133.8k |
| LIBERTY ONE INVESTMENT MANAGEMENT, LLC 3.73% of their portfolio | 984.8k $66.4m | Added +471.0k |
| PRINCIPAL FINANCIAL GROUP INC 0.03% of their portfolio | 943.6k $63.6m | Reduced -59.6k |
| JENNISON ASSOCIATES LLC 0.04% of their portfolio | 938.0k $63.2m | Added +216.4k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.01% of their portfolio | 933.4k $62.9m | Added +563.6k |
| Artisan Partners Limited Partnership 0.09% of their portfolio | 932.2k $62.8m | Reduced -66.4k |
| BARCLAYS PLC 0.02% of their portfolio | 908.1k $61.2m | Added +265.7k |
| ALLIANCEBERNSTEIN L.P. 0.02% of their portfolio | 896.3k $60.4m | Added +165.5k |
| LPL Financial LLC 0.02% of their portfolio | 794.3k $53.5m | Added +57.0k |
| ANCHOR CAPITAL ADVISORS LLC 1.54% of their portfolio | 788.7k $53.2m | Reduced -14.0k |
| UBS Group AG 0.01% of their portfolio | 781.9k $52.7m | Reduced -135.9k |
| California Public Employees Retirement System 0.03% of their portfolio | 773.1k $52.1m | Reduced -159.6k |
| Energy Income Partners, LLC 1.00% of their portfolio | 770.3k $51.9m | Added +4.6k |
| VAUGHAN DAVID INVESTMENTS LLC/IL 1.12% of their portfolio | 768.7k $51.8m | Reduced -8.9k |
| Swiss National Bank 0.03% of their portfolio | 740.5k $49.9m | Reduced -37.0k |
| ENVESTNET ASSET MANAGEMENT INC 0.01% of their portfolio | 715.0k $48.2m | Added +2.7k |
| VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. 0.43% of their portfolio | 706.6k $47.6m | Added +93.9k |
| MARSHALL WACE, LLP 0.05% of their portfolio | 706.5k $47.6m | Reduced -307.9k |
| Bahl & Gaynor LLC 0.23% of their portfolio | 675.4k $45.5m | Added +74.1k |
| DEUTSCHE BANK AG\ 0.02% of their portfolio | 674.2k $45.4m | Added +11.1k |
| Verition Fund Management LLC 0.25% of their portfolio | 644.3k $43.4m | Added +108.8k |
| Carnegie Investment Counsel 0.79% of their portfolio | 622.8k $42.0m | Added +24.5k |
| Sumitomo Mitsui Trust Group, Inc. 0.02% of their portfolio | 608.5k $41.0m | Added +8.7k |
| RHUMBLINE ADVISERS 0.03% of their portfolio | 582.8k $39.3m | Added +24.0k |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS 0.19% of their portfolio | 558.0k $37.6m | Added +18.2k |
| WELLS FARGO & COMPANY/MN 0.01% of their portfolio | 547.9k $36.9m | Added +56.0k |
| Mitsubishi UFJ Asset Management Co., Ltd. 0.03% of their portfolio | 528.5k $35.6m | Added +43.9k |
| Hudson Bay Capital Management LP 0.22% of their portfolio | 526.1k $35.5m | Added +119.8k |
| ROYAL BANK OF CANADA 0.01% of their portfolio | 511.5k $34.5m | Reduced -342.9k |
| Amundi 0.01% of their portfolio | 507.0k $34.5m | Added +208.0k |
| T. Rowe Price Investment Management, Inc. 0.02% of their portfolio | 499.2k $33.6m | Reduced -234.0k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.03% of their portfolio | 491.3k $33.1m | Added +21.8k |
| Russell Investments Group, Ltd. 0.04% of their portfolio | 461.0k $31.1m | Added +129.6k |
| Retirement Systems of Alabama 0.10% of their portfolio | 438.9k $29.6m | Reduced -305 |
| BNP PARIBAS FINANCIAL MARKETS 0.02% of their portfolio | 433.1k $29.2m | Added +29.5k |
| HITE Hedge Asset Management LLC 1.50% of their portfolio | 409.5k $27.6m | Reduced -22.9k |
| PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO 0.10% of their portfolio | 396.6k $26.7m | Unchanged |
| HSBC HOLDINGS PLC 0.02% of their portfolio | 386.7k $26.1m | Reduced -23.4k |
| Yaupon Capital Management LP 1.34% of their portfolio | 384.6k $25.9m | Reduced -89.0k |
| GODSEY & GIBB, INC 2.22% of their portfolio | 372.6k $25.1m | Reduced -1.6k |
| GABELLI FUNDS LLC 0.16% of their portfolio | 351.8k $23.7m | Added +2.0k |
| SCHRODER INVESTMENT MANAGEMENT GROUP 0.02% of their portfolio | 344.4k $23.2m | Reduced -8.4k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.02% of their portfolio | 309.5k $20.9m | Added +3.0k |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) 0.61% of their portfolio | 303.0k $20.4m | Not comparable |
| GATEWAY INVESTMENT ADVISERS LLC 0.19% of their portfolio | 289.8k $19.5m | Added +554 |
| CITIGROUP INC 0.01% of their portfolio | 289.2k $19.5m | Reduced -56.2k |
| APG Asset Management N.V. 0.04% of their portfolio | 275.7k $15.8m | Unchanged |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.04% of their portfolio | 268.9k $18.1m | Reduced -488 |
| RAYMOND JAMES FINANCIAL INC 0.01% of their portfolio | 266.8k $18.0m | Reduced -26.2k |
| RENAISSANCE TECHNOLOGIES LLC 0.02% of their portfolio | 260.4k $17.6m | Added +98.6k |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.03% of their portfolio | 255.4k $17.2m | Reduced -21.0k |
| NATIXIS ADVISORS, LLC 0.02% of their portfolio | 244.9k $16.5m | Reduced -15.0k |
| Aventail Capital Group, LP 0.78% of their portfolio | 244.7k $16.5m | Added +177.0k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.04% of their portfolio | 242.0k $16.3m | Reduced -5.3k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.02% of their portfolio | 233.9k $15.8m | Reduced -151.4k |
| Gotham Asset Management, LLC 0.07% of their portfolio | 228.0k $15.4m | Added +21.8k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 227.8k $15.4m | Reduced -23.2k |
| Epoch Investment Partners, Inc. 0.08% of their portfolio | 227.2k $15.3m | Reduced -6.4k |
| Man Group plc 0.03% of their portfolio | 215.8k $14.6m | Added +167.4k |
| CIBC Asset Management Inc 0.04% of their portfolio | 208.1k $14.0m | Added +5.2k |
| NISA INVESTMENT ADVISORS, LLC 0.05% of their portfolio | 197.6k $13.3m | Added +383 |
| SEI INVESTMENTS CO 0.01% of their portfolio | 194.9k $13.1m | Added +103.3k |
| Greenland Capital Management LP 1.91% of their portfolio | 193.1k $13.0m | Reduced -70.5k |
| Cetera Investment Advisers 0.01% of their portfolio | 187.5k $12.6m | Added +12.6k |
| BANK OF MONTREAL /CAN/ 0.01% of their portfolio | 184.0k $12.4m | Added +4.2k |