LNT SEC filings (2026)
CIK 352541 · Electric & Other Services Combined (SIC 4931) · incorporated in WI · fiscal year ends in December
3,124 filings on EDGAR since 1994 · 39 annual, 104 quarterly, 313 current · financial statements · earnings
What happened, last 12 months#
Every earnings release with its print, every report with its quarter, the other 8-Ks by the headline of the press release they furnish or by their items, the proxy statements, and each day an insider bought or sold — newest first, each line opening the filing on EDGAR. The index by form and year follows.
August 2026
- Aug 218-K8-K · Interstate Power and Light CompanyOther events
- Aug 10Insider saleDURIAN ROBERT J (EVP and CFO) sold 0.097 shares for $7 at $68.60
July 2026
- Jul 31ReportQuarterly report, Q2 2026 — revenue $971.0M (+1% y/y), net income $170.0M, EPS $0.65
- Jul 318-K8-K · ALLIANT ENERGY ANNOUNCES SECOND QUARTER 2026 RESULTSResults of operations
May 2026
- May 218-K8-K · Shareholder vote results
- May 1ReportQuarterly report, Q1 2026 — revenue $1.18B (+5% y/y), net income $224.0M, EPS $0.87
- May 18-K8-K · ALLIANT ENERGY ANNOUNCES FIRST QUARTER 2026 RESULTSResults of operations
March 2026
- Mar 31ProxyProxy · Annual report to shareholders
- Mar 31ProxyProxy · Additional proxy materials
- Mar 31ProxyProxy · Proxy statement
- Mar 198-K8-K · Material definitive agreement
- Mar 48-K8-K · Material definitive agreement; New financial obligation
February 2026
- Feb 20ReportAnnual report, FY2025 — revenue $4.36B (+10% y/y), net income $810.0M, EPS $3.14
- Feb 208-K8-K · ALLIANT ENERGY ANNOUNCES 2025 RESULTSResults of operations
January 2026
- Jan 88-K8-K · Directors or officers; compensation
December 2025
- Dec 168-K8-K · Directors or officers; compensation
- Dec 58-K8-K · Wisconsin Power and Light CompanyOther events
November 2025
- Nov 7ReportQuarterly report, Q3 2025 — revenue $1.21B (+12% y/y), net income $281.0M, EPS $1.09
- Nov 78-K8-K · ALLIANT ENERGY ANNOUNCES THIRD QUARTER 2025 RESULTS AND 2026 GUIDANCEResults of operations
Insider transactions#
What officers, directors and 10% holders reported on Forms 4 and 5 over the last 13 months, from the documents themselves: one insider’s trades of one kind on one day are one row, with the shares, the price range and the total as filed. Open-market buys and sells first; awards, exercises, tax withholding, gifts and employee-plan purchases are grouped below them.
Over the last 13 months insiders sold $7 in 1 sale and bought nothing on the open market; 47 other transactions (awards, exercises, tax withholding, gifts and plan purchases).
| Date | Insider |
|---|---|
| Aug 10, 2026Form 4 | DURIAN ROBERT JEVP and CFOSold · $7 · 0.097 sh |
Awards, exercises, withholding and plan purchases · 47 transactions
| Date | Insider |
|---|---|
| Oct 9, 2026Form 4 | Raymond ChristieDirectorAward · Deferred Common Stock Units · $76K · 1,157.935 sh |
| Oct 9, 2026Form 4 | Asthana ManuDirectorAward · Deferred Common Stock Units · $76K · 1,157.935 sh |
| Oct 9, 2026Form 4 | Garcia Michael DennisDirectorAward · Deferred Common Stock Units · $61K · 926.348 sh |
| Oct 9, 2026Form 4 | Newport Roger KDirectorAward · Deferred Common Stock Units · $58K · 877.942 sh |
| Oct 9, 2026Form 4 | Falotico Nancy JoyDirectorAward · Deferred Common Stock Units · $57K · 863.706 sh |
| Oct 9, 2026Form 4 | Cortina Ignacio ADirectorAward · Deferred Common Stock Units · $54K · 822.577 sh |
| Oct 9, 2026Form 4 | Cox StephanieDirectorAward · Deferred Common Stock Units · $40K · 607.441 sh |
| Oct 9, 2026Form 4 | ALLEN PATRICK EDirectorAward · Deferred Common Stock Units · $37K · 569.476 sh |
| Jul 10, 2026Form 4 | Raymond ChristieDirectorAward · Deferred Common Stock Units · $76K · 998.036 sh |
| Jul 10, 2026Form 4 | Asthana ManuDirectorAward · Deferred Common Stock Units · $76K · 998.036 sh |
| Jul 10, 2026Form 4 | Garcia Michael DennisDirectorAward · Deferred Common Stock Units · $64K · 837.696 sh |
| Jul 10, 2026Form 4 | Falotico Nancy JoyDirectorAward · Deferred Common Stock Units · $57K · 744.437 sh |
| Jul 10, 2026Form 4 | Newport Roger KDirectorAward · Deferred Common Stock Units · $56K · 736.257 sh |
| Jul 10, 2026Form 4 | Cortina Ignacio ADirectorAward · Deferred Common Stock Units · $49K · 638.089 sh |
| Jul 10, 2026Form 4 | Cox StephanieDirectorAward · Deferred Common Stock Units · $40K · 523.561 sh |
| Jul 10, 2026Form 4 | ALLEN PATRICK EDirectorAward · Deferred Common Stock Units · $38K · 490.838 sh |
| Apr 15, 2026Form 4 | Smyth Antonio PExecutive Vice PresidentTax withholding · $91K · 1,259 sh |
| Apr 10, 2026Form 4 | Raymond ChristieDirectorAward · Deferred Common Stock Units · $76K · 1,043.092 sh |
| Apr 10, 2026Form 4 | Garcia Michael DennisDirectorAward · Deferred Common Stock Units · $64K · 875.513 sh |
| Apr 10, 2026Form 4 | Falotico Nancy JoyDirectorAward · Deferred Common Stock Units · $57K · 778.044 sh |
| Apr 10, 2026Form 4 | Newport Roger KDirectorAward · Deferred Common Stock Units · $56K · 769.494 sh |
| Apr 10, 2026Form 4 | Cortina Ignacio ADirectorAward · Deferred Common Stock Units · $49K · 666.895 sh |
| Apr 10, 2026Form 4 | Cox StephanieDirectorAward · Deferred Common Stock Units · $40K · 547.196 sh |
| Apr 10, 2026Form 4 | ALLEN PATRICK EDirectorAward · Deferred Common Stock Units · $38K · 512.996 sh |
| Feb 19, 2026Form 4 | Barton Lisa MPresident and CEO · DirectorTax withholding · $2.0M · 28,594 sh |
| Feb 19, 2026Form 4 | DURIAN ROBERT JEVP and CFOTax withholding · $1.2M · 16,630 sh |
| Feb 19, 2026Form 4 | Sundararajan RajaExecutive Vice PresidentTax withholding · $793K · 11,324 sh |
| Feb 19, 2026Form 4 | Smyth Antonio PExecutive Vice PresidentTax withholding · $436K · 6,226 sh |
| Feb 19, 2026Form 4 | de Leon David ASenior Vice PresidentTax withholding · $365K · 5,207 sh |
| Feb 19, 2026Form 4 | Farlinger MayuriVice PresidentTax withholding · $83K · 1,179 sh |
| Feb 19, 2026Form 4 | Syse DylanCAO and ControllerTax withholding · $35K · 506 sh |
| Feb 19, 2026Form 4 | Valcq Rebecca C.Vice PresidentTax withholding · $31K · 438 sh |
| Feb 19, 2026Form 4 | Barton Lisa MPresident and CEO · DirectorAward · $0 · 77,060 sh |
| Feb 19, 2026Form 4 | DURIAN ROBERT JEVP and CFOAward · $0 · 33,832 sh |
| Feb 19, 2026Form 4 | Sundararajan RajaExecutive Vice PresidentAward · $0 · 27,552 sh |
| Feb 19, 2026Form 4 | Smyth Antonio PExecutive Vice PresidentAward · $0 · 18,354 sh |
| Feb 19, 2026Form 4 | de Leon David ASenior Vice PresidentAward · $0 · 10,922 sh |
| Feb 19, 2026Form 4 | Farlinger MayuriVice PresidentAward · $0 · 4,124 sh |
| Feb 19, 2026Form 4 | Syse DylanCAO and ControllerAward · $0 · 1,813 sh |
| Feb 19, 2026Form 4 | Valcq Rebecca C.Vice PresidentAward · $0 · 1,004 sh |
| Jan 9, 2026Form 4 | Raymond ChristieDirectorAward · Deferred Common Stock Units · $76K · 1,172.716 sh |
| Jan 9, 2026Form 4 | Garcia Michael DennisDirectorAward · Deferred Common Stock Units · $64K · 984.313 sh |
| Jan 9, 2026Form 4 | Falotico Nancy JoyDirectorAward · Deferred Common Stock Units · $57K · 874.731 sh |
| Jan 9, 2026Form 4 | Newport Roger KDirectorAward · Deferred Common Stock Units · $56K · 865.118 sh |
| Jan 9, 2026Form 4 | Cortina Ignacio ADirectorAward · Deferred Common Stock Units · $49K · 749.769 sh |
| Jan 9, 2026Form 4 | Cox StephanieDirectorAward · Deferred Common Stock Units · $40K · 615.196 sh |
| Jan 9, 2026Form 4 | ALLEN PATRICK EDirectorAward · Deferred Common Stock Units · $38K · 576.746 sh |
Reports and proxy statements#
Annual reports (10-K, 20-F, 40-F), quarterly reports (10-Q), current reports (8-K, 6-K) and proxy statements, newest first. An 8-K that furnishes a press release is headed by the release’s headline, its items beneath; any other 8-K is described by its items. A form opens the press release where there is one, else the document on EDGAR, or the filing’s index where it furnishes other exhibits.
2026 · 14 filings
| Filed | What it is |
|---|---|
| Aug 21, 20268-K | Interstate Power and Light CompanyOther events |
| Jul 31, 202610-Q | Quarterly report, Q2 2026 — revenue $971.0M (+1% y/y), net income $170.0M, EPS $0.65 |
| Jul 31, 20268-K | ALLIANT ENERGY ANNOUNCES SECOND QUARTER 2026 RESULTSResults of operations |
| May 21, 20268-K | Shareholder vote results |
| May 1, 202610-Q | Quarterly report, Q1 2026 — revenue $1.18B (+5% y/y), net income $224.0M, EPS $0.87 |
| May 1, 20268-K | ALLIANT ENERGY ANNOUNCES FIRST QUARTER 2026 RESULTSResults of operations |
| Mar 31, 2026ARS | Annual report to shareholders |
| Mar 31, 2026DEFA14A | Additional proxy materials |
| Mar 31, 2026DEF 14A | Proxy statement |
| Mar 19, 20268-K | Material definitive agreement |
| Mar 4, 20268-K | Material definitive agreement; New financial obligation |
| Feb 20, 202610-K | Annual report, FY2025 — revenue $4.36B (+10% y/y), net income $810.0M, EPS $3.14 |
| Feb 20, 20268-K | ALLIANT ENERGY ANNOUNCES 2025 RESULTSResults of operations |
| Jan 8, 20268-K | Directors or officers; compensation |
2025 · 23 filings
| Filed | What it is |
|---|---|
| Dec 16, 20258-K | Directors or officers; compensation |
| Dec 5, 20258-K | Wisconsin Power and Light CompanyOther events |
| Nov 7, 202510-Q | Quarterly report, Q3 2025 — revenue $1.21B (+12% y/y), net income $281.0M, EPS $1.09 |
| Nov 7, 20258-K | ALLIANT ENERGY ANNOUNCES THIRD QUARTER 2025 RESULTS AND 2026 GUIDANCEResults of operations |
| Sep 26, 20258-K | Other events |
| Sep 11, 20258-K | Other events |
| Aug 8, 202510-Q | Quarterly report, Q2 2025 — revenue $961.0M (+7% y/y), net income $174.0M, EPS $0.68 |
| Aug 8, 20258-K | Results of operations |
| May 20, 20258-K | Shareholder vote results |
| May 19, 20258-K | Other events |
| May 15, 20258-K | Material definitive agreement; New financial obligation; Unregistered sale of equity; Other events |
| May 9, 20258-K | Material definitive agreement |
| May 9, 202510-Q | Quarterly report, Q1 2025 — revenue $1.13B (+9% y/y), net income $213.0M, EPS $0.83 |
| May 9, 20258-K | Results of operations |
| May 8, 2025PX14A6G | Shareholder exempt solicitation |
| Apr 1, 2025ARS | Annual report to shareholders |
| Apr 1, 2025DEFA14A | Additional proxy materials |
| Apr 1, 2025DEF 14A | Proxy statement |
| Mar 10, 20258-K | Directors or officers; compensation |
| Mar 3, 20258-K | Material definitive agreement; New financial obligation |
| Feb 21, 202510-K | Annual report, FY2024 — revenue $3.98B (+2704% y/y), net income $690.0M, EPS $2.69 |
| Feb 21, 20258-K | Results of operations |
| Feb 11, 20258-K | Directors or officers; compensation |
2024 · 22 filings
| Filed | What it is |
|---|---|
| Dec 18, 20248-K | New financial obligation |
| Nov 1, 202410-Q | Quarterly report, Q3 2024 — revenue $1.08B (+0% y/y), net income $295.0M, EPS $1.15 |
| Nov 1, 20248-K | Results of operations |
| Sep 6, 20248-K | Other events |
| Aug 2, 202410-Q | Quarterly report, Q2 2024 — revenue $894.0M (−2% y/y), net income $87.0M, EPS $0.34 |
| Aug 2, 20248-K | Results of operations |
| Jul 26, 20248-K | Item 5.04 |
| Jul 15, 20248-K | Directors or officers; compensation |
| Jun 24, 20248-K | Material impairment |
| Jun 6, 20248-K | Material definitive agreement; New financial obligation; Other events |
| May 20, 20248-K | Shareholder vote results |
| May 3, 202410-Q | Quarterly report, Q1 2024 — revenue $1.03B (−4% y/y), net income $158.0M, EPS $0.62 |
| May 3, 20248-K | Results of operations |
| Apr 2, 2024ARS | Annual report to shareholders |
| Apr 2, 2024DEFA14A | Additional proxy materials |
| Apr 2, 2024DEF 14A | Proxy statement |
| Mar 8, 20248-K | Directors or officers; compensation |
| Mar 7, 20248-K | Other events |
| Mar 5, 20248-K | Material definitive agreement; New financial obligation |
| Feb 16, 202410-K | Annual report, FY2023 — revenue $142.0M (+0% y/y), net income $703.0M, EPS $2.78 |
| Feb 16, 20248-K | Results of operations |
| Feb 13, 20248-K | Directors or officers; compensation |
2023 · 22 filings — 15 × 8-K, 3 × 10-Q, 1 × 10-K and 3 other forms
| Filed | What it is |
|---|---|
| Nov 3, 202310-Q | Quarterly report, Q3 2023 — revenue $1.08B (−5% y/y), net income $259.0M, EPS $1.02 |
| Aug 4, 202310-Q | Quarterly report, Q2 2023 — revenue $912.0M (−3% y/y), net income $160.0M, EPS $0.64 |
| May 5, 202310-Q | Quarterly report, Q1 2023 — revenue $1.08B (+1% y/y), net income $163.0M, EPS $0.65 |
| Apr 4, 2023ARS | Annual report to shareholders |
| Apr 4, 2023DEFA14A | Additional proxy materials |
| Apr 4, 2023DEF 14A | Proxy statement |
| Feb 24, 202310-K | Annual report, FY2022 — revenue $142.0M (−96% y/y), net income $686.0M, EPS $2.73 |
15 current reports (8-K) not listed; the year is on EDGAR.
2022 · 16 filings — 10 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms
| Filed | What it is |
|---|---|
| Nov 8, 202210-Q | Quarterly report, Q3 2022 — revenue $1.14B (+11% y/y), net income $227.0M, EPS $0.90 |
| Aug 5, 202210-Q | Quarterly report, Q2 2022 — revenue $943.0M (+15% y/y), net income $159.0M, EPS $0.63 |
| Apr 29, 202210-Q | Quarterly report, Q1 2022 — revenue $1.07B (+19% y/y), net income $192.0M, EPS $0.77 |
| Mar 31, 2022DEFA14A | Additional proxy materials |
| Mar 31, 2022DEF 14A | Proxy statement |
| Feb 18, 202210-K | Annual report, FY2021 — revenue $3.67B (+7% y/y), net income $674.0M, EPS $2.63 |
10 current reports (8-K) not listed; the year is on EDGAR.
2021 · 19 filings — 13 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms
| Filed | What it is |
|---|---|
| Nov 5, 202110-Q | Quarterly report, Q3 2021 — revenue $1.02B (+11% y/y), net income $259.0M, EPS $1.02 |
| Aug 6, 202110-Q | Quarterly report, Q2 2021 — revenue $817.0M (+7% y/y), net income $146.0M, EPS $0.57 |
| May 7, 202110-Q | Quarterly report, Q1 2021 — revenue $901.0M (−2% y/y), net income $174.0M, EPS $0.68 |
| Apr 1, 2021DEFA14A | Additional proxy materials |
| Apr 1, 2021DEF 14A | Proxy statement |
| Feb 19, 202110-K | Annual report, FY2020 — revenue $3.42B (−6% y/y), net income $624.0M, EPS $2.47 |
13 current reports (8-K) not listed; the year is on EDGAR.
2020 · 18 filings — 12 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms
| Filed | What it is |
|---|---|
| Nov 3, 202010-Q | Quarterly report, Q3 2020 — revenue $920.0M (−7% y/y), net income $249.0M, EPS $0.98 |
| Aug 10, 202010-Q | Quarterly report, Q2 2020 — revenue $763.0M (−3% y/y), net income $136.0M, EPS $0.54 |
| May 8, 202010-Q | Quarterly report, Q1 2020 — revenue $916.0M (−7% y/y), net income $173.0M |
| Apr 9, 2020DEFA14A | Additional proxy materials |
| Apr 9, 2020DEF 14A | Proxy statement |
| Feb 21, 202010-K | Annual report, FY2019 — revenue $3.65B (+3% y/y), net income $567.0M, EPS $2.33 |
12 current reports (8-K) not listed; the year is on EDGAR.
2019 · 16 filings — 11 × 8-K, 3 × 10-Q, 1 × 10-K and 1 other form
| Filed | What it is |
|---|---|
| Nov 7, 201910-Q | Quarterly report, Q3 2019 — revenue $990.0M (+7% y/y), net income $229.0M, EPS $0.94 |
| Aug 2, 201910-Q | Quarterly report, Q2 2019 — revenue $790.2M (−3% y/y), net income $97.1M, EPS $0.40 |
| May 3, 201910-Q | Quarterly report, Q1 2019 — revenue $987.2M (+8% y/y), net income $127.7M, EPS $0.53 |
| Apr 8, 2019DEF 14A | Proxy statement |
| Feb 22, 201910-K | Annual report, FY2018 — revenue $3.53B (+4% y/y), net income $522.0M, EPS $2.19 |
11 current reports (8-K) not listed; the year is on EDGAR.
2018 · 20 filings — 15 × 8-K, 3 × 10-Q, 1 × 10-K and 1 other form
| Filed | What it is |
|---|---|
| Nov 7, 201810-Q | Quarterly report, Q3 2018 — revenue $928.6M (+2% y/y), net income $208.1M, EPS $0.87 |
| Aug 3, 201810-Q | Quarterly report, Q2 2018 — revenue $816.1M (+7% y/y), net income $102.9M, EPS $0.43 |
| May 3, 201810-Q | Quarterly report, Q1 2018 — revenue $916.3M (+7% y/y), net income $123.5M, EPS $0.52 |
| Apr 9, 2018DEF 14A | Proxy statement |
| Feb 23, 201810-K | Annual report, FY2017 — revenue $3.38B (+2% y/y), net income $467.5M, EPS $1.99 |
15 current reports (8-K) not listed; the year is on EDGAR.
2017 · 18 filings — 11 × 8-K, 3 × 10-Q, 2 × DEFA14A and 2 other forms
| Filed | What it is |
|---|---|
| Nov 3, 201710-Q | Quarterly report, Q3 2017 — revenue $906.9M (−2% y/y), net income $171.4M, EPS $0.73 |
| Aug 4, 201710-Q | Quarterly report, Q2 2017 — revenue $765.3M (+1% y/y), net income $96.8M, EPS $0.41 |
| May 8, 2017DEFA14A | Additional proxy materials |
| May 4, 201710-Q | Quarterly report, Q1 2017 — revenue $853.9M (+1% y/y), net income $103.0M, EPS $0.44 |
| Apr 20, 2017DEFA14A | Additional proxy materials |
| Apr 18, 2017DEF 14A | Proxy statement |
| Feb 24, 201710-K | Annual report, FY2016 — revenue $3.32B (+2% y/y), net income $381.7M |
11 current reports (8-K) not listed; the year is on EDGAR.
2016 · 14 filings — 9 × 8-K, 3 × 10-Q, 1 × 10-K and 1 other form
Counted, not listed; the year is on EDGAR.
2015 · 15 filings — 9 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms
Counted, not listed; the year is on EDGAR.
2014 · 18 filings — 12 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms
Counted, not listed; the year is on EDGAR.
2013 · 15 filings — 8 × 8-K, 3 × 10-Q, 1 × 10-K and 3 other forms
Counted, not listed; the year is on EDGAR.
2012 · 13 filings — 7 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms
Counted, not listed; the year is on EDGAR.
2011 · 18 filings — 11 × 8-K, 3 × 10-Q, 1 × 10-K and 3 other forms
Counted, not listed; the year is on EDGAR.
2010 · 22 filings — 15 × 8-K, 3 × 10-Q, 1 × 10-K and 3 other forms
Counted, not listed; the year is on EDGAR.
2009 · 22 filings — 16 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms
Counted, not listed; the year is on EDGAR.
2008 · 21 filings — 15 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms
Counted, not listed; the year is on EDGAR.
2007 · 16 filings — 10 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms
Counted, not listed; the year is on EDGAR.
2006 · 20 filings — 12 × 8-K, 3 × 10-Q, 2 × 8-K/A and 3 other forms
Counted, not listed; the year is on EDGAR.
2005 · 20 filings — 13 × 8-K, 3 × 10-Q, 1 × 10-K and 3 other forms
Counted, not listed; the year is on EDGAR.
2004 · 14 filings — 7 × 8-K, 3 × 10-Q, 1 × 10-K and 3 other forms
Counted, not listed; the year is on EDGAR.
2003 · 14 filings — 8 × 8-K, 3 × 10-Q, 1 × 10-K and 2 other forms
Counted, not listed; the year is on EDGAR.
2002 · 19 filings — 9 × 8-K, 3 × 10-Q, 3 × 10-Q/A and 4 other forms
Counted, not listed; the year is on EDGAR.
2001 · 10 filings — 4 × 8-K, 3 × 10-Q, 1 × 10-K405 and 2 other forms
Counted, not listed; the year is on EDGAR.
2000 · 14 filings — 7 × 8-K, 3 × 10-Q, 1 × 10-K and 3 other forms
Counted, not listed; the year is on EDGAR.
1999 · 11 filings — 3 × 10-Q, 2 × 10-Q/A, 2 × 8-K and 4 other forms
Counted, not listed; the year is on EDGAR.
1998 · 10 filings — 3 × 10-Q, 3 × 8-K, 1 × 10-K405 and 3 other forms
Counted, not listed; the year is on EDGAR.
1997 · 5 filings — 3 × 10-Q, 1 × 10-K405, 1 × DEF 14A
Counted, not listed; the year is on EDGAR.
1996 · 20 filings — 11 × DEFA14A, 3 × 10-Q, 3 × 8-K and 3 other forms
Counted, not listed; the year is on EDGAR.
1995 · 7 filings — 3 × 10-Q, 1 × 10-K, 1 × 10-K/A and 2 other forms
Counted, not listed; the year is on EDGAR.
1994 · 7 filings — 3 × 10-Q, 2 × 10-K/A, 1 × 10-K and 1 other form
Counted, not listed; the year is on EDGAR.
Insider, ownership and other filings#
Insider ownership (Forms 3, 4, 5 and 144), beneficial ownership (Schedules 13D and 13G), registration and prospectus (S-1, S-3, S-8, 424B and related) and the rest, counted by year, with the newest 25 of each of the latest 3 years shown. A Form 4 is one insider’s transaction report; a 13G is a passive holder above five percent.
2026 · 55 filings — 40 × 4, 7 × S-8 POS, 2 × 3 and 5 other forms
| Filed | What it is |
|---|---|
| Oct 14, 20264 | Insider transaction (Form 4) |
| Oct 14, 20264 | Insider transaction (Form 4) |
| Oct 14, 20264 | Insider transaction (Form 4) |
| Oct 14, 20264 | Insider transaction (Form 4) |
| Oct 14, 20264 | Insider transaction (Form 4) |
| Oct 14, 20264 | Insider transaction (Form 4) |
| Oct 14, 20264 | Insider transaction (Form 4) |
| Oct 14, 20264 | Insider transaction (Form 4) |
| Aug 12, 20264 | Insider transaction (Form 4) |
| Jul 14, 20264 | Insider transaction (Form 4) |
| Jul 14, 20264 | Insider transaction (Form 4) |
| Jul 14, 20264 | Insider transaction (Form 4) |
| Jul 14, 20264 | Insider transaction (Form 4) |
| Jul 14, 20264 | Insider transaction (Form 4) |
| Jul 14, 20264 | Insider transaction (Form 4) |
| Jul 14, 20264 | Insider transaction (Form 4) |
| Jul 14, 20264 | Insider transaction (Form 4) |
| Jun 16, 202611-K | Employee plan annual report |
| Apr 29, 2026SCHEDULE 13G | Other filings |
| Apr 28, 2026SCHEDULE 13G | Other filings |
| Apr 16, 20264 | Insider transaction (Form 4) |
| Apr 14, 20264 | Insider transaction (Form 4) |
| Apr 14, 20264 | Insider transaction (Form 4) |
| Apr 14, 20264 | Insider transaction (Form 4) |
| Apr 14, 20264 | Insider transaction (Form 4) |
The newest 25 of 55 shown; the full year is on EDGAR.
2025 · 40 filings — 32 × 4, 3 × 424B5, 2 × 3 and 3 other forms
| Filed | What it is |
|---|---|
| Oct 14, 20254 | Insider transaction (Form 4) |
| Oct 14, 20254 | Insider transaction (Form 4) |
| Oct 14, 20254 | Insider transaction (Form 4) |
| Oct 14, 20254 | Insider transaction (Form 4) |
| Oct 14, 20254 | Insider transaction (Form 4) |
| Oct 14, 20254 | Insider transaction (Form 4) |
| Sep 25, 2025424B5 | Prospectus supplement |
| Sep 23, 2025FWP | Free writing prospectus |
| Sep 23, 2025424B5 | Prospectus supplement |
| Sep 22, 2025POSASR | Registration and prospectus |
| Jul 15, 20254 | Insider transaction (Form 4) |
| Jul 15, 20254 | Insider transaction (Form 4) |
| Jul 15, 20254 | Insider transaction (Form 4) |
| Jul 15, 20254 | Insider transaction (Form 4) |
| Jul 15, 20254 | Insider transaction (Form 4) |
| Jul 15, 20254 | Insider transaction (Form 4) |
| Jun 24, 202511-K | Employee plan annual report |
| May 9, 2025424B5 | Prospectus supplement |
| Apr 16, 20254 | Insider transaction (Form 4) |
| Apr 16, 20253 | Initial insider holdings (Form 3) |
| Apr 15, 20254 | Insider transaction (Form 4) |
| Apr 15, 20254 | Insider transaction (Form 4) |
| Apr 15, 20254 | Insider transaction (Form 4) |
| Apr 15, 20254 | Insider transaction (Form 4) |
| Apr 15, 20254 | Insider transaction (Form 4) |
The newest 25 of 40 shown; the full year is on EDGAR.
2024 · 43 filings — 36 × 4, 4 × SC 13G/A, 2 × 3 and 1 other form
| Filed | What it is |
|---|---|
| Nov 20, 20244 | Insider transaction (Form 4) |
| Oct 16, 2024SC 13G/A | Passive holder above 5% (Schedule 13G), amended |
| Oct 15, 20244 | Insider transaction (Form 4) |
| Oct 15, 20244 | Insider transaction (Form 4) |
| Oct 15, 20244 | Insider transaction (Form 4) |
| Oct 15, 20244 | Insider transaction (Form 4) |
| Oct 15, 20244 | Insider transaction (Form 4) |
| Oct 15, 20244 | Insider transaction (Form 4) |
| Oct 15, 20244 | Insider transaction (Form 4) |
| Jul 16, 20244 | Insider transaction (Form 4) |
| Jul 16, 20244 | Insider transaction (Form 4) |
| Jul 16, 20244 | Insider transaction (Form 4) |
| Jul 16, 20244 | Insider transaction (Form 4) |
| Jul 16, 20244 | Insider transaction (Form 4) |
| Jul 16, 20244 | Insider transaction (Form 4) |
| Jul 16, 20244 | Insider transaction (Form 4) |
| Jun 20, 202411-K | Employee plan annual report |
| May 9, 20244 | Insider transaction (Form 4) |
| May 9, 20244 | Insider transaction (Form 4) |
| May 9, 20243 | Initial insider holdings (Form 3) |
| Apr 16, 20244 | Insider transaction (Form 4) |
| Apr 16, 20244 | Insider transaction (Form 4) |
| Apr 16, 20244 | Insider transaction (Form 4) |
| Apr 16, 20244 | Insider transaction (Form 4) |
| Apr 16, 20244 | Insider transaction (Form 4) |
The newest 25 of 43 shown; the full year is on EDGAR.
2023 · 47 filings — 32 × 4, 4 × 3, 4 × SC 13G/A and 4 other forms
Counted, not listed; the year is on EDGAR.
2022 · 52 filings — 45 × 4, 4 × SC 13G/A, 1 × 11-K and 2 other forms
Counted, not listed; the year is on EDGAR.
2021 · 49 filings — 39 × 4, 5 × 4/A, 2 × SC 13G/A and 3 other forms
Counted, not listed; the year is on EDGAR.
2020 · 50 filings — 42 × 4, 2 × S-3ASR, 2 × SC 13G/A and 4 other forms
Counted, not listed; the year is on EDGAR.
2019 · 51 filings — 41 × 4, 3 × 3, 3 × SC 13G/A and 4 other forms
Counted, not listed; the year is on EDGAR.
2018 · 33 filings — 22 × 4, 2 × 424B5, 2 × SC 13G/A and 7 other forms
Counted, not listed; the year is on EDGAR.
2017 · 39 filings — 28 × 4, 3 × SC 13G/A, 2 × S-3ASR and 5 other forms
Counted, not listed; the year is on EDGAR.
2016 · 77 filings — 64 × 4, 2 × 3, 2 × 4/A and 6 other forms
Counted, not listed; the year is on EDGAR.
2015 · 89 filings — 75 × 4, 6 × 4/A, 2 × 3 and 5 other forms
Counted, not listed; the year is on EDGAR.
2014 · 146 filings — 139 × 4, 2 × S-3ASR, 2 × SC 13G/A and 3 other forms
Counted, not listed; the year is on EDGAR.
2013 · 72 filings — 69 × 4, 1 × 11-K, 1 × 3 and 1 other form
Counted, not listed; the year is on EDGAR.
2012 · 84 filings — 79 × 4, 3 × 4/A, 1 × 11-K and 1 other form
Counted, not listed; the year is on EDGAR.
2011 · 159 filings — 149 × 4, 3 × 3, 2 × S-3ASR and 4 other forms
Counted, not listed; the year is on EDGAR.
2010 · 137 filings — 128 × 4, 3 × 3, 2 × 4/A and 4 other forms
Counted, not listed; the year is on EDGAR.
2009 · 105 filings — 96 × 4, 2 × 424B5, 2 × UPLOAD and 5 other forms
Counted, not listed; the year is on EDGAR.
2008 · 90 filings — 82 × 4, 1 × 11-K, 1 × 424B3 and 6 other forms
Counted, not listed; the year is on EDGAR.
2007 · 178 filings — 164 × 4, 6 × 4/A, 2 × 3 and 4 other forms
Counted, not listed; the year is on EDGAR.
2006 · 184 filings — 160 × 4, 15 × 4/A, 2 × 3 and 6 other forms
Counted, not listed; the year is on EDGAR.
2005 · 197 filings — 176 × 4, 6 × 35-CERT, 4 × U-9C-3 and 9 other forms
Counted, not listed; the year is on EDGAR.
2004 · 248 filings — 214 × 4, 9 × 35-CERT, 4 × U-1/A and 13 other forms
Counted, not listed; the year is on EDGAR.
2003 · 144 filings — 106 × 4, 12 × 35-CERT, 4 × U-9C-3 and 16 other forms
Counted, not listed; the year is on EDGAR.
2002 · 42 filings — 11 × 35-CERT, 9 × POS AMC, 4 × U-9C-3 and 14 other forms
Counted, not listed; the year is on EDGAR.
2001 · 47 filings — 14 × 35-CERT, 7 × U-1/A, 7 × U-57 and 11 other forms
Counted, not listed; the year is on EDGAR.
2000 · 57 filings — 14 × U-12-IB, 12 × POS AMC, 11 × 35-CERT and 8 other forms
Counted, not listed; the year is on EDGAR.
1999 · 41 filings — 9 × U-1/A, 9 × U-57, 6 × 35-CERT and 10 other forms
Counted, not listed; the year is on EDGAR.
1998 · 20 filings — 8 × U-1/A, 4 × U-1, 2 × 35-CERT and 6 other forms
Counted, not listed; the year is on EDGAR.
1997 · 5 filings — 2 × U-1/A, 1 × 424B3, 1 × S-3 and 1 other form
Counted, not listed; the year is on EDGAR.
1996 · 5 filings — 2 × S-4, 1 × S-4/A, 1 × U-1 and 1 other form
Counted, not listed; the year is on EDGAR.
1995 · 4 filings — 4 × SC 13D
Counted, not listed; the year is on EDGAR.
1994 · 1 filing — 1 × S-8
Counted, not listed; the year is on EDGAR.
About this data#
Alliant Energy Corporation (LNT) has 3,124 filings on EDGAR going back to 1994: 39 annual reports, 104 quarterly reports and 313 current reports, plus proxy statements, insider forms and ownership schedules. Its latest annual report, a 10-K, was filed on Feb 20, 2026 for the fiscal year ended Dec 31, 2025. The most recent 8-K, on Aug 21, 2026, furnished a press release headed “Interstate Power and Light Company”. Over the last 13 months insiders sold $7 in 1 sale and bought nothing on the open market; 47 other transactions (awards, exercises, tax withholding, gifts and plan purchases). Not investment advice.
Every row is a filing EDGAR lists for the registrants that have been Alliant Energy Corporation, read from the SEC’s submissions index each morning; a filing accepted after that read appears the next day. Where a company changed its filing entity (a holding-company reorganisation, Google into Alphabet) the predecessor’s filings are shown for the years it filed as the company, derived from the filings themselves. Dates are the filing date; the period is the report’s own. The latest 3 years of reports are listed in full, the next years to 10 without their 8-Ks, and older years are counted; the other forms are counted too, with the newest 25 of each of the latest 3 years shown. Insider transactions are the Form 4 and Form 5 documents themselves, filed since January 2026, every number as the insider filed it: a day’s lots are summed, a blank price adds its shares and no dollars, and a purchase through an employee stock plan is a plan purchase, not insider buying. An 8-K’s headline is the first line of the press release it furnishes (Exhibit 99), read from the filing and shown word for word; where two independent readings of the exhibit do not agree, the 8-K is described by its items instead. The documents stay on sec.gov, public domain, and every link opens the SEC’s copy. ChartRow does not summarise or interpret filings.
FAQ#
- Where can I read LNT's latest 10-K?
- LNT's latest annual report, a 10-K, was filed on Feb 20, 2026 for the fiscal year ended Dec 31, 2025. It is linked above and opens on EDGAR, the SEC's own site, where every exhibit is also listed.
- When did LNT last file an 8-K?
- On Aug 21, 2026 it furnished a press release headed “Interstate Power and Light Company”. An 8-K reports a material event between quarterly reports; the one that furnishes the quarter's results is filed under Item 2.02, last on Jul 31, 2026.
- Are LNT insiders buying or selling?
- Over the last 13 months insiders sold $7 in 1 sale and bought nothing on the open market; 47 other transactions (awards, exercises, tax withholding, gifts and plan purchases). The most recent sale: DURIAN ROBERT J (EVP and CFO) sold 0.097 shares on Aug 10, 2026 for $7. Every figure is as the insider filed it on Form 4; a sale under a 10b5-1 plan was scheduled in advance.
- How many SEC filings has LNT made?
- 3,124 filings are on EDGAR under the registrant records that have been Alliant Energy Corporation, going back to 1994; 2,151 of them are insider ownership forms (Forms 3, 4, 5 and 144).