Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Amendment No. 1 on Form 10-K/A of NexPoint Capital, Inc. (the “Company”), for the annual period ended December 31, 2025, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), we, James Dondero and Frank Waterhouse, President and Principal Financial Officer, respectively, of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of our knowledge:

 

(1)	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 the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Report.

 

Date: April 7, 2026						/s/ James Dondero
						James Dondero
						President and Principal Executive Officer

 

						/s/ Frank Waterhouse
						Frank Waterhouse
						Treasurer, Principal Accounting Officer and Principal
						Financial Officer