# EDGAR Filing Document

**Accession Number:** 0000104918
**File Stem:** 0001193125-26-138047
**Filing Date:** 2026-4
**Character Count:** 6817
**Document Hash:** 7b3ee10bd9c532ab5b0d71be18c786bd
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-138047.hdr.sgml**: 20260401

**ACCESSION NUMBER**: 0001193125-26-138047

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 4

**FILED AS OF DATE**: 20260401

**DATE AS OF CHANGE**: 20260401

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AVISTA CORP
- **CENTRAL INDEX KEY:** 0000104918
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC & OTHER SERVICES COMBINED [4931]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 910462470
- **STATE OF INCORPORATION:** WA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-03701
- **FILM NUMBER:** 26828801

**BUSINESS ADDRESS:**
- **STREET 1:** 1411 E MISSION AVE
- **CITY:** SPOKANE
- **STATE:** WA
- **ZIP:** 99202
- **BUSINESS PHONE:** 5094890500

**MAIL ADDRESS:**
- **STREET 1:** 1411 EAST MISSION
- **CITY:** SPOKANE
- **STATE:** WA
- **ZIP:** 99202

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** WASHINGTON WATER POWER CO
- **DATE OF NAME CHANGE:** 19920703

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

**SCHEDULE 14A INFORMATION** 

**Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934** 

**(Amendment No.)** 

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

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| |
|:---|
|  ☐ Preliminary Proxy Statement<br>☐ **Confidential, for Use of the Commission Only**<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **(as permitted by Rule 14a-6(e)(2))**<br>|
|  ☐ Definitive Proxy Statement |
|  ☒ Definitive Additional Materials |
|  ☐ Soliciting Material under §240.14a-12 |

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**AVISTA CORPORATION** 

(Name of registrant as specified in its charter)<br>

(Name of person(s) filing proxy statement, if other than the registrant)

Payment of Filing Fee (Check all boxes that apply):

☒ No fee required

☐ Fee paid previously with preliminary materials

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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![LOGO](g75683dsp1a.jpg)

You invested in AVISTA CORP. and it's time to vote!

You have the right to vote on proposals being presented at the Annual Meeting. **This is an important notice regarding the availability of proxy material for the shareholder meeting to be held on May 14, 2026.**

Get informed before you vote

View the Notice & Proxy Statement, Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 30, 2026. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy.

![LOGO](g75683dsp1b.jpg)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\*Please check the meeting materials for any special requirements for meeting attendance.

V2.1

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 **Vote at www.ProxyVote.com Control # XXXX XXXX XXXX XXXX** 

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| | | |
|:---|:---|:---|
| **THIS IS NOT A VOTABLE BALLOT** | **SHARE CLASSES REPRESENTED FOR VOTING** | **SHARE CLASSES REPRESENTED FOR VOTING** |
| **THIS IS NOT A VOTABLE BALLOT** | **THE COMPANY NAME INC. - COMMON ASDFGHJKL** | **123456789.1234** |
|  | **THE COMPANY NAME INC. - CLASS A** | **123456789.1234** |
| &nbsp;&nbsp;&nbsp;&nbsp; This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. | **THE COMPANY NAME INC. - CLASS B** | **123456789.1234** |
| &nbsp;&nbsp;&nbsp;&nbsp; This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. | **THE COMPANY NAME INC. - CLASS C** | **123456789.1234** |
| &nbsp;&nbsp;&nbsp;&nbsp; This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. | **THE COMPANY NAME INC. - CLASS D** | **123456789.1234** |
| &nbsp;&nbsp;&nbsp;&nbsp; This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. | **THE COMPANY NAME INC. - CLASS E** | **123456789.1234** |
|  | **THE COMPANY NAME INC. - CLASS F** | **123456789.1234** |
|  | **THE COMPANY NAME INC. - 401 K** | **123456789.1234** |

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| | | | |
|:---|:---|:---|:---|
| **Voting Items** | **Voting Items** | **Board Recommends** | **Board Recommends** |
| 1. | Election of Directors |  |  |
|  | **Nominees:** |  |  |
| 1a. | Julie A. Bentz | ![LOGO](g75683dsp2a.jpg) | **For** |
| 1b. | Donald C. Burke | ![LOGO](g75683dsp2a.jpg) | **For** |
| 1c. | Kevin B. Jacobsen | ![LOGO](g75683dsp2a.jpg) | **For** |
| 1d. | Rebecca A. Klein | ![LOGO](g75683dsp2a.jpg) | **For** |
| 1e. | Sena M. Kwawu | ![LOGO](g75683dsp2a.jpg) | **For** |
| 1f. | Scott H. Maw | ![LOGO](g75683dsp2a.jpg) | **For** |
| 1g. | Scott L. Morris | ![LOGO](g75683dsp2a.jpg) | **For** |
| 1h. | Jeffry L. Philipps | ![LOGO](g75683dsp2a.jpg) | **For** |
| 1i. | Heather L. Rosentrater | ![LOGO](g75683dsp2a.jpg) | **For** |
| 1j. | Heidi B. Stanley | ![LOGO](g75683dsp2a.jpg) | **For** |
| 1k. | Janet D. Widmann | ![LOGO](g75683dsp2a.jpg) | **For** |
| <br> 2. | Ratification of the appointment of Deloitte & Touche LLP as the Company's independent registered public accounting firm for 2026. | ![LOGO](g75683dsp2a.jpg) | **For** |
| <br> 3. | Advisory (non-binding) vote on executive compensation. | ![LOGO](g75683dsp2a.jpg) | **For** |
| <br> 4. | Amendment of the Company's Restated Articles of Incorporation to reduce the shareholder approval requirement for specified matters from 80% of the total number of shares of common stock outstanding to a majority of such shares outstanding. | ![LOGO](g75683dsp2a.jpg) | **For** |
| &nbsp;&nbsp; **NOTE:** The proxies will have discretionary authority to transact such other business as may come before the meeting or any adjournment or postponement thereof. | &nbsp;&nbsp; **NOTE:** The proxies will have discretionary authority to transact such other business as may come before the meeting or any adjournment or postponement thereof. |  |  |

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Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click "Delivery Settings".

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| | |
|:---|:---|
|  | 1.00000 |
|  | 322224 |
| QAARV2-P12345 | 148294 |
|  | CLT ID |

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