# EDGAR Filing Document

**Accession Number:** 0000041719
**File Stem:** 0001140361-26-001151
**Filing Date:** 2026-1
**Character Count:** 2434
**Document Hash:** cfee277a176761ae7f6b24c455a09b70
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-26-001151.hdr.sgml**: 20260114

**ACCESSION NUMBER**: 0001140361-26-001151

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260114

**DATE AS OF CHANGE**: 20260114

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Magnera Corp
- **CENTRAL INDEX KEY:** 0000041719
- **STANDARD INDUSTRIAL CLASSIFICATION:** PAPER MILLS [2621]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 230628360
- **STATE OF INCORPORATION:** PA
- **FISCAL YEAR END:** 0927

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-03560
- **FILM NUMBER:** 26531439

**BUSINESS ADDRESS:**
- **STREET 1:** 9335 HARRIS CORNERS PKWY
- **STREET 2:** SUITE 300
- **CITY:** CHARLOTTE
- **STATE:** NC
- **ZIP:** 28269
- **BUSINESS PHONE:** 866-744-7380

**MAIL ADDRESS:**
- **STREET 1:** 9335 HARRIS CORNERS PKWY
- **STREET 2:** SUITE 300
- **CITY:** CHARLOTTE
- **STATE:** NC
- **ZIP:** 28269

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Glatfelter Corp
- **DATE OF NAME CHANGE:** 20200930

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GLATFELTER P H CO
- **DATE OF NAME CHANGE:** 19920703

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

#### SCHEDULE 14A <br>
Proxy Statement Pursuant to Section 14(a) of the Securities

Exchange Act of 1934 (Amendment No.)

<br> Filed by the Registrant ☑ <br> Filed by a Party other than the Registrant ☐

Check the appropriate box:<br>

---

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

---

#### <br>

## Magnera Corporation
(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

---

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