EX-32.1 4 atr-20250930x10qexx321.htm EX-32.1
Exhibit 32.1
Certificate Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002
I, Stephan B. Tanda, president and chief executive officer of AptarGroup, Inc., certify that (i) the Quarterly Report on Form 10-Q of AptarGroup, Inc. for the quarter ended September 30, 2025 (the “Form 10-Q”) fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 and (ii) the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of AptarGroup, Inc.

| By: | /s/ STEPHAN B. TANDA
|  | Stephan B. Tanda
|  | President and Chief Executive Officer
|  | October 31, 2025