# EDGAR Filing Document

**Accession Number:** 0000066570
**File Stem:** 0001193125-26-125910
**Filing Date:** 2026-3
**Character Count:** 6361
**Document Hash:** 070f90cdd7e11f7dfb65604c60ce2921
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-125910.hdr.sgml**: 20260326

**ACCESSION NUMBER**: 0001193125-26-125910

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 4

**FILED AS OF DATE**: 20260326

**DATE AS OF CHANGE**: 20260326

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MSA Safety Inc
- **CENTRAL INDEX KEY:** 0000066570
- **STANDARD INDUSTRIAL CLASSIFICATION:** ORTHOPEDIC, PROSTHETIC & SURGICAL APPLIANCES & SUPPLIES [3842]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 464914539
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-15579
- **FILM NUMBER:** 26796844

**BUSINESS ADDRESS:**
- **STREET 1:** 1000 CRANBERRY WOODS DRIVE
- **CITY:** CRANBERRY TOWNSHIP
- **STATE:** PA
- **ZIP:** 16066
- **BUSINESS PHONE:** 724-776-8600

**MAIL ADDRESS:**
- **STREET 1:** 1000 CRANBERRY WOODS DRIVE
- **CITY:** CRANBERRY TOWNSHIP
- **STATE:** PA
- **ZIP:** 16066

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MINE SAFETY APPLIANCES CO
- **DATE OF NAME CHANGE:** 19920703

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

**SCHEDULE 14A** 

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

---

## MSA Safety Incorporated
**(Name of Registrant as Specified In Its Charter)** 

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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|:---|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br> MSA SAFETY INCORPORATED<br>1000 CRANBERRY WOODS DRIVE<br>CRANBERRY TOWNSHIP, PA 16066<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;V84510-P47046<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | ![LOGO](g15929g08j01.jpg) |

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You invested in MSA SAFETY INCORPORATED 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 materials for the shareholder meeting to be held on May 8, 2026.**

Get informed before you vote

View the Annual Report to Shareholders, Notice of Annual Meeting and Proxy Statement online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 24, 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](g15929g08j02.jpg)

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

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**Vote at www.ProxyVote.com** 

**THIS IS NOT A VOTABLE BALLOT**

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.

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| | | |
|:---|:---|:---|
| **Voting Items** | **Voting Items** | **Board<br>Recommends** |
| 1. | Election of Directors for a term expiring in 2029. |  |
|  | **Nominees:** |  |
|  | 01) William M. Lambert | **For** |
|  | 02) Diane M. Pearse |  |
|  | 03) Nishan J. Vartanian |  |
| 2. | Selection of Ernst & Young LLP as the Company's independent registered public accounting firm. | **For** |
| 3. | To provide an advisory vote to approve the executive compensation of the Company's named executive officers. | **For** |
| **NOTE:** Such other business as may properly come before the meeting or any adjournment thereof. | **NOTE:** Such other business as may properly come before the meeting or any adjournment thereof. |  |

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

V84511-P47046