EX-32.1 4 zyxi-20250630xex32d1.htm EX-32.1

Exhibit 32.1

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CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF THE

SARBANES-OXLEY ACT OF 2002

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The undersigned hereby certifies, for the purposes of Section 1350 of Chapter 63 of Title 18 of the United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, in his capacity as an officer of Zynex, Inc. (“Zynex”), that to his knowledge:

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| 1. | This Quarterly Report on Form 10-Q for the quarter ended June 30, 2025 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
| 2. | The information contained in such Report fairly presents, in all material respects, the financial condition and results of operations of Zynex for the period covered by this Report.

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Dated: July 31, 2025

/s/ Thomas Sandgaard |  |
Thomas Sandgaard |  |
Chairman, President, Chief Executive Officer and Principal Executive Officer |  |

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