X0202 SCHEDULE 13D/A 0002016004 XXXXXXXX LIVE 3 Common Stock, par value $0.001 08/25/2026 false 0001493761 900450206 Turtle Beach Corporation

15822 Bernardo Center Drive, Suite 105 San Diego CA 92127

David Smith (310) 553-6700 O'Melveny & Myers LLP 1999 Avenue of Stars, 8th Floor Los Angeles CA 90067 0002016004 N DC VGA LLC b OO N DE 674706 0.00 674706 0.00 674706 N 3.8 OO Note to Row 13: Calculated based on 17,909,711 shares of the common stock, par value $0.001 per share (the "common stock"), of Turtle Beach Corporation (the "Issuer"), outstanding as of July 30, 2026, as reported by the Issuer in its Quarterly Report on Form 10-Q (the "Form 10-Q") for the fiscal quarter ended June 30, 2026, filed with the Securities and Exchange Commission on August 6, 2026. 0001760525 N Diversis Capital Partners I, L.P. b OO N DE 674706 0.00 674706 0.00 674706 N 3.8 PN Note to Row 13: Calculated based on 17,909,711 shares of common stock outstanding as of July 30, 2026, as reported by the Issuer in the Form 10-Q. 0002016766 N Diversis Capital Partners GP I, L.P. b OO N DE 674706 0.00 674706 0.00 674706 N 3.8 PN Note to Row 13: Calculated based on 17,909,711 shares of common stock outstanding as of July 30, 2026, as reported by the Issuer in the Form 10-Q. 0002016765 N Diversis Capital Partners GP I, LLC b OO N DE 674706 0.00 674706 0.00 674706 N 3.8 OO Note to Row 13: Calculated based on 17,909,711 shares of common stock outstanding as of July 30, 2026, as reported by the Issuer in the Form 10-Q. 0001456120 N Kevin Ma b OO N X1 674706 0.00 674706 0.00 674706 N 3.8 IN Note to Row 13: Calculated based on 17,909,711 shares of common stock outstanding as of July 30, 2026, as reported by the Issuer in the Form 10-Q. 0002016573 N Ron Nayot b OO N X1 674706 0.00 674706 0.00 674706 N 3.8 IN Note to Row 13: Calculated based on 17,909,711 shares of common stock outstanding as of July 30, 2026, as reported by the Issuer in the Form 10-Q. Common Stock, par value $0.001 Turtle Beach Corporation 15822 Bernardo Center Drive, Suite 105 San Diego CA 92127 This amended statement on Schedule 13D/A relates to the common stock, par value $0.001 per share (the "Common Stock"), of Turtle Beach Corporation (the "Issuer"). The statement on Schedule 13D originally filed with the Securities and Exchange Commission (the "SEC") by the Reporting Persons, on March 21, 2024 (the "Schedule 13D"), is hereby amended and supplemented to include the information set forth herein. This amended statement on Schedule 13D/A (this "Amendment") constitutes Amendment No. 3 to the Schedule 13D (the Schedule 13D, as amended by Amendment No. 1, filed with the SEC on August 22, 2025 and further amended by Amendment No. 2, filed with the SEC on August 12, 2026, and this Amendment, collectively, the "Statement"). Except as set forth herein, the Schedule 13D is unmodified. The information set forth on the cover page is hereby incorporated by reference. The information set forth on the cover page is hereby incorporated by reference. On August 13, 2026, the Reporting Persons sold 115,016 shares of Common Stock in the open market at a weighted average price of $12.9030. These shares were sold in multiple transactions at prices ranging from $12.85 to $13.115. On August 14, 2026, the Reporting Persons sold 19,438 shares of Common Stock in the open market at a weighted average price of $12.8507. These shares were sold in multiple transactions at prices ranging from $12.85 to $12.86. On August 25, 2026, the Reporting Persons sold 143,136 shares of Common Stock in the open market at a weighted average price of $12.8612. These shares were sold in multiple transactions at pricing ranging from $12.85 to $12.9430. On August 26, 2026, the Reporting Persons sold 54,043 shares of Common Stock in the open market at a weighted average price of $12.8583. These shares were sold in multiple transactions at prices ranging from $12.85 to $12.93. On August 27, 2026, the Reporting Persons sold 769,102 shares of Common Stock in the open market at a weighted average price of $12.9361. These shares were sold in multiple transactions at prices ranging from $12.85 to $13.31. Not applicable. Not applicable. 99.1 Joint Filing Agreement, dated as of March 13, 2024. DC VGA LLC /s/ Kevin Ma 08/27/2026 Diversis Capital Partners I, L.P. /s/ Kevin Ma 08/27/2026 Diversis Capital Partners GP I, L.P. /s/ Kevin Ma 08/27/2026 Diversis Capital Partners GP I, LLC /s/ Kevin Ma 08/27/2026 Kevin Ma /s/ Kevin Ma 08/27/2026 Ron Nayot /s/ Ron Nayot 08/27/2026