Exhibit 22.1
LIST OF SUBSIDIARY GUARANTORS
Guaranteed Securities
The following securities (collectively, the “Magnera Senior Secured Notes”) issued by the respective entities listed below were outstanding as of September 27, 2025.
| Description of Notes | Issuer |
| 7.25% First Priority Senior Secured Notes due 2031 (the “7.25% Notes”) | Treasure Merger Sub II, LLC, a Delaware limited liability company and wholly-owned subsidiary of Magnera Corp. (“Treasure Merger Sub”) |
| 4.75% First Priority Senior Secured Notes due 2029 (the “4.75% Notes”) | Magnera Corp., a Pennsylvania corporation (the “Company”) |
Obligors
As of September 27, 2025, the obligors under the Magnera Senior Secured Notes consisted of the Company, as issuer of the 4.75% Notes and as a guarantor of the 7.25% Notes, Treasure Merger Sub as issuer of the 7.25% Notes, and the Company’s subsidiaries listed in the following table:
| Name | Jurisdiction | Obligor Type |
| AVINTIV INC. | Delaware | Guarantor |
| AVINTIV Acquisition LLC | Delaware | Guarantor |
| AVINTIV Specialty Materials, LLC | Delaware | Guarantor |
| Magnera Film Products Acquisition Company, Inc. (f/k/a Berry Film Products Acquisition Company, Inc.) | Delaware | Guarantor |
| Magnera Film Products Company, Inc. (f/k/a Berry Film Products Company, Inc.) | Delaware | Guarantor |
| Chicopee, LLC | Delaware | Guarantor |
| Dominion Textile (USA), L.L.C. | Delaware | Guarantor |
| Fabrene, L.L.C. | Delaware | Guarantor |
| Fiberweb, LLC | Delaware | Guarantor |
| Glatfelter Advanced Materials N.A., LLC | Delaware | Guarantor |
| Glatfelter Composite Fibers NA, Inc. | Delaware | Guarantor |
| Glatfelter Digital Solutions, LLC | Delaware | Guarantor |
| Glatfelter Mt. Holly LLC | Delaware | Guarantor |
| Glatfelter Sontara Old Hickory, Inc. | Delaware | Guarantor |
| Old Hickory Steamworks, LLC | Delaware | Guarantor |
| PGI Europe, LLC | Delaware | Guarantor |
| PGI Polymer, LLC | Delaware | Guarantor |
| PHG Tea Leaves, Inc. | Delaware | Guarantor |
| Treasure Merger Sub II, LLC | Delaware | Issuer |
| Magnera Aschersleben GmbH (f/k/a Berry Aschersleben GmbH) | Germany | Guarantor |
| Magnera Dombühl GmbH (f/k/a Berry Dombühl GmbH) | Germany | Guarantor |
| Magnera Europe GmbH (f/k/a Berry Europe GmbH) | Germany | Guarantor |
| Fabrene, Inc. | Canada | Guarantor |
| Fiberweb Berlin GmbH | Germany | Guarantor |
| FIBERWEB GEOSYNTHETICS LIMITED | UK | Guarantor |
| Fiberweb Holdings Limited | UK | Guarantor |
| FIBERWEB LIMITED | UK | Guarantor |
| Glatfelter Berlin GmbH | Germany | Guarantor |
| Glatfelter Caerphilly Limited | UK | Guarantor |
| Glatfelter Dresden GmbH | Germany | Guarantor |
| Glatfelter Falkenhagen GmbH | Germany | Guarantor |
| GLATFELTER GATINEAU LTÉE | Canada | Guarantor |
| Glatfelter Gernsbach GmbH | Germany | Guarantor |
| Glatfelter Lydney, Ltd. | UK | Guarantor |
| Glatfelter Services GmbH | Germany | Guarantor |
| Glatfelter Steinfurt GmbH | Germany | Guarantor |
| HHS German Holdings GmbH | Germany | Guarantor |
| PGI ACQUISITION LIMITED | UK | Guarantor |
| Terram Limited | UK | Guarantor |
| Glatfelter Industries Asheville, Inc. | North Carolina | Guarantor |
| Providencia USA, Inc. | North Carolina | Guarantor |
| Magnera Corporation | Pennsylvania | Guarantor / Issuer |
Pledged Security Collateral
As of September 27, 2025, the obligations under the Magnera Senior Secured Notes were secured by pledges of the capital stock of the following affiliates of the Company:
| Issuer | Owner | Number of Issuer Certificate | Number and Class of Equity Interest | Percentage of Equity Interests Pledged |
| GW Partners, LLC | Glatfelter Corporation (to be renamed Magnera Corporation) | N/A | N/A; Limited liability company interest | 100% |
| Glatfelter Holdings, LLC | Glatfelter Corporation (to be renamed Magnera Corporation) | 2 | N/A; Limited liability company interest | 100% |
| Glatfelter Advanced Materials N.A., LLC | Glatfelter Corporation (to be renamed Magnera Corporation) | N/A | N/A; Limited liability company interest | 100% |
| Glatfelter Mt. Holly LLC | Glatfelter Corporation (to be renamed Magnera Corporation) | N/A | N/A; Limited liability company interest | 100% |
| Glatfelter Digital Solutions, LLC | Glatfelter Corporation (to be renamed Magnera Corporation) | N/A | N/A; Limited liability company interest | 100% |
| Treasure Merger Sub II, LLC | Glatfelter Corporation (to be renamed Magnera Corporation) | N/A | N/A; Limited liability company interest | 100% |
| Glatfelter Composite Fibers NA, Inc. | Glatfelter Corporation (to be renamed Magnera Corporation) | 1 | 1,000 shares of common stock authorized; 500 shares issued | 100% |
| PHG Tea Leaves, Inc. | Glatfelter Corporation (to be renamed Magnera Corporation) | 3 | 1,000 shares of common stock | 100% |
| Glatfelter Sontara Old Hickory, Inc. | PHG Tea Leaves, Inc. | 2 | 100 shares of common stock | 100% |
| Glatfelter Industries Asheville, Inc. | PHG Tea Leaves, Inc. | 8 | 16,000 shares of common stock | 100% |
| Glatfelter Luxembourg S.À.R.L | PHG Tea Leaves, Inc. | N/A | 12,501 shares | 65% |
| Glatfelter Gatineau Ltée | PHG Tea Leaves, Inc. | C-3 | 42,396,408 shares | 100% |
| Glatfelter Holding (Luxembourg) AG | PHG Tea Leaves, Inc. | N/A | 3,229 shares | 65% |
| Glatfelter Russia, LLC | PHG Tea Leaves, Inc. | N/A | 1,666,000 shares | 65% |
| Glatfelter Russia, LLC | Glatfelter Composite Fibers NA, Inc. | N/A | 25,500 | 65% |
| Berry Film Products Company, Inc. | Treasure Merger Sub II, LLC | Lost. | Lost. | 100% |
| Berry Film Products Acquisition Company, Inc. | Berry Film Products Company, Inc. | Lost. | Lost. | 100% |
| Berry Holding Company do Brasil Ltda. | Berry Film Products Company, Inc. | Lost | Lost | 65% |
| Tyco Acquisition Alpha LLC | Berry Film Products Company, Inc. | N/A | N/A; Limited liability company interest | 100% |
| Rafypak, S.A. de C.V. | Berry Film Products Company, Inc. | Lost. | Lost. | 65% |
| AVINTIV INC. | Treasure Merger Sub II, LLC | Lost. | Lost. | 100% |
| AVINTIV Acquisition LLC | AVINTIV INC. | N/A | N/A; Limited liability company interest | 100% |
| AVINTIV Specialty Materials, LLC | AVINTIV Acquisition LLC | N/A | N/A; Limited liability company interest | 100% |
| PGI Polymer, LLC | AVINTIV Specialty Materials, LLC | N/A | N/A; Limited liability company interest | 100% |
| Fabrene, Inc. | AVINTIV INC. | Lost. | Lost. | 100% |
| HHS German Holdings GmbH | AVINTIV INC. | Lost. | Lost. | 65% |
| Chicopee, LLC | PGI Polymer, LLC | N/A | N/A; Limited liability company interest | 100% |
| Providencia USA, Inc. | Chicopee, LLC | 02 | 122,031,984,000 shares | 100% |
| Dominion Textile (USA), L.L.C. | Chicopee, LLC | N/A | N/A; Limited liability company interest | 100% |
| PGI Europe, LLC | Chicopee, LLC | N/A | N/A; Limited liability company interest | 100% |
| Fabrene, L.L.C. | Chicopee, LLC | N/A | N/A; Limited liability company interest | 100% |
| Chicopee Asia, Limited | Chicopee, LLC | 1 | 10,000 shares | 65% |
| Chicopee Holdings B.V. | PGI Europe, LLC | Lost. | Lost. | 65% |
| PGI Spain S.L.U. | PGI Europe, LLC | Lost. | Lost. | 65% |
| Fiberweb Geosynthetics Limited | PGI Europe, LLC | Lost. | Lost. | 65% |
| Fiberweb, LLC | PGI Europe, LLC | N/A | N/A; Limited liability company interest | 100% |
| Old Hickory Steamworks, LLC | Fiberweb, LLC | N/A | N/A; Limited liability company interest | 100% |
| PGI Nonwovens (Mauritius) | PGI Polymer, LLC | 3A | 2 shares | 65% |
| Fiberweb Holdings Limited | PGI Europe, LLC | Lost. | Lost. | 65% |
| Terram Limited | PGI Europe, LLC | Lost. | Lost. | 65% |
| PGI Acquisition Limited | PGI Europe, LLC | 4 | 65 ordinary share | 65% |