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 ($82.3m this quarter). Holder counts are more reliable. Shares outstanding: 256.9m as of 2025-03-31, 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 ≈ $64.28. Options: 9 managers hold calls ($39.6m notional), 8 hold puts ($10.3m).
Trends to Q1 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 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q2 2023 | 270 | 270 |
| 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 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q2 2024 | $5.6m | $6.4m | 1.13 |
| Q3 2024 | $10.7m | $6.3m | 0.59 |
| Q4 2024 | $3.5m | $3.0m | 0.84 |
| Q1 2025 | $39.6m | $10.3m | 0.26 |
Biggest buyers
| VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. | New | +1.3m |
| MORGAN STANLEY | Added | +655.2k |
| MARSHALL WACE, LLP | New | +543.0k |
| GOLDMAN SACHS GROUP INC | Added | +538.6k |
| Carnegie Investment Counsel | New | +531.7k |
| JPMORGAN CHASE & CO | Added | +525.9k |
| Freestone Grove Partners LP | New | +398.1k |
| PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO | Added | +371.3k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | New | +349.7k |
| HITE Hedge Asset Management LLC | New | +297.4k |
Biggest sellers
| T. Rowe Price Investment Management, Inc. | Reduced | -2.9m |
| CITADEL ADVISORS LLC | Reduced | -1.2m |
| BlackRock, Inc. | Reduced | -978.8k |
| Magellan Asset Management Ltd | Reduced | -915.0k |
| MAIRS & POWER INC | Reduced | -869.3k |
| Pictet Asset Management Holding SA | Reduced | -669.7k |
| Point72 Asset Management, L.P. | Sold out | -504.5k |
| Balyasny Asset Management L.P. | Sold out | -412.5k |
| National Pension Service | Reduced | -380.0k |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | Reduced | -314.7k |
Biggest calls
| UBS Group AG | New | $30.8m478.5k shares |
| MILLENNIUM MANAGEMENT LLC | New | $6.4m100.0k shares |
| CITADEL ADVISORS LLC | Reduced | $1.5m23.3k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $849.4k13.2k shares |
| Twin Tree Management, LP | New | $25.7k400 shares |
| Walleye Trading LLC | Reduced | $12.9k200 shares |
| SIMPLEX TRADING, LLC | Reduced | $12.0k200 shares |
| GROUP ONE TRADING LLC | Reduced | $6.4k100 shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Biggest puts
| MILLENNIUM MANAGEMENT LLC | New | $6.4m100.0k shares |
| Fulcrum Asset Management LLP | New | $2.3m42.6k shares |
| CITADEL ADVISORS LLC | Reduced | $765.8k11.9k shares |
| SIMPLEX TRADING, LLC | Reduced | $418.0k6.5k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | New | $386.1k6.0k shares |
| Walleye Trading LLC | New | $6.4k100 shares |
| Quaker Wealth Management, LLC | First filing | $4517 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 Q1 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 |
|---|---|---|---|---|---|
| Q2 2023 | 0 | — | 0 | — | — |
| 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 | — | — |
None reported in Q1 2025.
Holders, Q1 2025
| Manager | Shares | Change |
|---|---|---|
| VANGUARD GROUP INC 0.04% of their portfolio | 32.8m $2.1bn | Added +158.5k |
| BlackRock, Inc. 0.03% of their portfolio | 23.6m $1.5bn | Reduced -978.8k |
| STATE STREET CORP 0.04% of their portfolio | 16.4m $1.1bn | Added +11.7k |
| JANUS HENDERSON GROUP PLC 0.38% of their portfolio | 10.9m $691.0m | Added +99.8k |
| VICTORY CAPITAL MANAGEMENT INC 0.70% of their portfolio | 10.6m $681.5m | Reduced -216.2k |
| GEODE CAPITAL MANAGEMENT, LLC 0.03% of their portfolio | 6.9m $442.8m | Added +205.1k |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.14% of their portfolio | 6.7m $431.0m | Reduced -314.7k |
| Nuveen, LLC 0.12% of their portfolio | 6.3m $404.3m | First filing |
| Invesco Ltd. 0.06% of their portfolio | 4.6m $298.2m | Reduced -236.2k |
| FRANKLIN RESOURCES INC 0.07% of their portfolio | 3.7m $236.0m | Reduced -223 |
| MORGAN STANLEY 0.02% of their portfolio | 3.5m $222.9m | Added +655.2k |
| Pictet Asset Management Holding SA 0.24% of their portfolio | 3.4m $219.2m | Reduced -669.7k |
| BANK OF AMERICA CORP /DE/ 0.02% of their portfolio | 3.2m $203.1m | Reduced -52.8k |
| MAIRS & POWER INC 2.04% of their portfolio | 3.0m $195.9m | Reduced -869.3k |
| NORTHERN TRUST CORP 0.02% of their portfolio | 2.4m $157.2m | Added +30.6k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.03% of their portfolio | 2.3m $146.1m | Added +17.7k |
| COHEN & STEERS, INC. 0.27% of their portfolio | 2.2m $143.5m | Reduced -75.4k |
| Legal & General Group Plc 0.04% of their portfolio | 2.2m $142.8m | Added +105.6k |
| Thrivent Financial for Lutherans 0.30% of their portfolio | 2.1m $135.4m | Reduced -220.8k |
| Bank of New York Mellon Corp 0.03% of their portfolio | 2.0m $129.9m | Reduced -37.4k |
| DUFF & PHELPS INVESTMENT MANAGEMENT CO 1.44% of their portfolio | 1.9m $123.3m | Reduced -140.0k |
| JOHNSON INVESTMENT COUNSEL INC 1.16% of their portfolio | 1.9m $120.5m | Added +56.6k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.03% of their portfolio | 1.7m $112.1m | Added +133.9k |
| NEUBERGER BERMAN GROUP LLC 0.09% of their portfolio | 1.7m $106.5m | Reduced -37.6k |
| FIRST TRUST ADVISORS LP 0.09% of their portfolio | 1.6m $105.6m | Added +269.6k |
| DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio | 1.3m $84.3m | Reduced -42.2k |
| UBS Group AG 0.02% of their portfolio | 1.3m $84.2m | Reduced -91.2k |
| VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. 0.82% of their portfolio | 1.3m $82.5m | New |
| T. Rowe Price Investment Management, Inc. 0.05% of their portfolio | 1.3m $81.3m | Reduced -2.9m |
| California Public Employees Retirement System 0.05% of their portfolio | 1.1m $73.5m | Reduced -32.4k |
| PRINCIPAL FINANCIAL GROUP INC 0.04% of their portfolio | 1.1m $72.9m | Reduced -35.7k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 1.1m $69.8m | Added +538.6k |
| Artisan Partners Limited Partnership 0.11% of their portfolio | 1.0m $65.0m | Added +8.1k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 932.3k $60.0m | Added +525.9k |
| ANCHOR CAPITAL ADVISORS LLC 1.57% of their portfolio | 817.7k $52.6m | Reduced -51.5k |
| DEUTSCHE BANK AG\ 0.02% of their portfolio | 795.8k $51.2m | Reduced -13.4k |
| VAUGHAN DAVID INVESTMENTS LLC/IL 1.16% of their portfolio | 767.9k $49.4m | Added +4.6k |
| Energy Income Partners, LLC 0.94% of their portfolio | 765.2k $49.2m | Added +25.9k |
| Swiss National Bank 0.03% of their portfolio | 723.7k $46.6m | Reduced -1.0k |
| ENVESTNET ASSET MANAGEMENT INC 0.01% of their portfolio | 698.3k $44.9m | Added +37.4k |
| BARCLAYS PLC 0.02% of their portfolio | 672.3k $43.3m | Reduced -296.4k |
| REAVES W H & CO INC 1.07% of their portfolio | 652.0k $42.0m | Reduced -134.9k |
| LPL Financial LLC 0.02% of their portfolio | 640.1k $41.2m | Added +156.3k |
| REGIONS FINANCIAL CORP 0.30% of their portfolio | 617.0k $39.7m | Reduced -10.8k |
| Sumitomo Mitsui Trust Group, Inc. 0.03% of their portfolio | 606.2k $39.0m | Reduced -9.2k |
| ALLIANCEBERNSTEIN L.P. 0.01% of their portfolio | 573.9k $36.9m | Added +36.9k |
| RHUMBLINE ADVISERS 0.03% of their portfolio | 546.1k $35.1m | Added +19.3k |
| MARSHALL WACE, LLP 0.05% of their portfolio | 543.0k $34.9m | New |
| LIBERTY ONE INVESTMENT MANAGEMENT, LLC 3.51% of their portfolio | 539.1k $34.7m | Added +516 |
| JENNISON ASSOCIATES LLC 0.02% of their portfolio | 537.7k $34.6m | Reduced -7.2k |
| BNP PARIBAS FINANCIAL MARKETS 0.03% of their portfolio | 535.0k $34.4m | First filing |
| Carnegie Investment Counsel 0.81% of their portfolio | 531.7k $34.2m | New |
| BI Asset Management Fondsmaeglerselskab A/S 0.39% of their portfolio | 531.6k $34.2m | Added +4.0k |
| FMR LLC 0.00% of their portfolio | 516.7k $33.2m | Added +154.6k |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS 0.19% of their portfolio | 489.1k $31.5m | Added +3.6k |
| WELLS FARGO & COMPANY/MN 0.01% of their portfolio | 487.5k $31.4m | Reduced -1.7k |
| ROYAL BANK OF CANADA 0.01% of their portfolio | 485.2k $31.2m | Added +767 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.03% of their portfolio | 474.2k $30.5m | Reduced -713 |
| Bahl & Gaynor LLC 0.16% of their portfolio | 474.1k $30.5m | Added +71.3k |
| Mitsubishi UFJ Asset Management Co., Ltd. 0.03% of their portfolio | 464.7k $29.9m | Added +36.9k |
| Retirement Systems of Alabama 0.11% of their portfolio | 446.0k $28.7m | Reduced -4.8k |
| HSBC HOLDINGS PLC 0.02% of their portfolio | 423.0k $27.1m | Reduced -25.5k |
| Freestone Grove Partners LP 0.26% of their portfolio | 398.1k $25.6m | New |
| PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO 0.11% of their portfolio | 396.6k $25.5m | Added +371.3k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.05% of their portfolio | 384.2k $24.7m | Added +144.5k |
| GODSEY & GIBB, INC 2.36% of their portfolio | 373.6k $24.0m | Added +3.3k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 365.6k $23.5m | Added +5.2k |
| SCHRODER INVESTMENT MANAGEMENT GROUP 0.02% of their portfolio | 357.6k $22.7m | Reduced -267 |
| GABELLI FUNDS LLC 0.17% of their portfolio | 349.7k $22.5m | Reduced -5.5k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.02% of their portfolio | 349.7k $22.5m | New |
| Russell Investments Group, Ltd. 0.03% of their portfolio | 340.4k $21.9m | Added +91.3k |
| RAYMOND JAMES FINANCIAL INC 0.01% of their portfolio | 340.1k $21.9m | Reduced -9.6k |
| NATIXIS ADVISORS, LLC 0.04% of their portfolio | 305.5k $19.7m | Added +104.9k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.02% of their portfolio | 303.5k $19.5m | Reduced -1.2k |
| Hudson Bay Capital Management LP 0.12% of their portfolio | 299.2k $19.3m | Reduced -36.5k |
| HITE Hedge Asset Management LLC 1.19% of their portfolio | 297.4k $19.1m | New |
| GATEWAY INVESTMENT ADVISERS LLC 0.21% of their portfolio | 289.2k $18.6m | Reduced -4.8k |
| NATIONAL BANK OF CANADA /FI/ 0.02% of their portfolio | 286.1k $18.4m | Added +72.7k |
| BANK OF MONTREAL /CAN/ 0.01% of their portfolio | 282.6k $18.2m | Reduced -40.1k |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 281.9k $18.1m | Reduced -109.0k |
| CITIGROUP INC 0.01% of their portfolio | 277.2k $17.8m | Added +97.3k |
| AE Wealth Management LLC 0.15% of their portfolio | 274.6k $17.7m | Added +47.6k |
| Amundi 0.01% of their portfolio | 274.3k $17.8m | Added +59.5k |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.03% of their portfolio | 273.6k $17.6m | Unchanged |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.04% of their portfolio | 269.3k $17.3m | Reduced -4.3k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 258.7k $16.6m | Reduced -2.3k |
| Epoch Investment Partners, Inc. 0.08% of their portfolio | 245.2k $15.8m | Reduced -8.6k |
| Verition Fund Management LLC 0.09% of their portfolio | 244.5k $15.7m | Reduced -314.3k |
| D. E. Shaw & Co., Inc. 0.02% of their portfolio | 241.7k $15.6m | New |
| Sourcerock Group LLC 0.87% of their portfolio | 240.2k $15.5m | Added +136.0k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.04% of their portfolio | 217.1k $14.0m | Added +25.2k |
| Gotham Asset Management, LLC 0.12% of their portfolio | 215.9k $13.9m | Added +72.2k |
| NISA INVESTMENT ADVISORS, LLC 0.06% of their portfolio | 196.9k $12.7m | Reduced -3.6k |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC 0.21% of their portfolio | 196.8k $12.7m | Added +58.0k |
| SEI INVESTMENTS CO 0.01% of their portfolio | 176.7k $11.4m | Reduced -99.0k |
| MACQUARIE GROUP LTD 0.01% of their portfolio | 174.0k $11.2m | Reduced -19.4k |
| Magellan Asset Management Ltd 0.14% of their portfolio | 173.4k $11.2m | Reduced -915.0k |
| Allspring Global Investments Holdings, LLC 0.02% of their portfolio | 172.9k $11.1m | Reduced -157 |
| Asset Management One Co., Ltd. 0.04% of their portfolio | 169.0k $10.9m | Added +8.1k |
| PRUDENTIAL FINANCIAL INC 0.02% of their portfolio | 168.9k $10.9m | Added +32.5k |