X0202 SCHEDULE 13G 0002104745 XXXXXXXX LIVE Class A ordinary shares, par value $0.0001 per share 03/31/2026 0002099093 Hennessy Capital Investment Corp. VIII G44055104 195 US Hwy 50 Suite 207 Zephyr Cove NV 89448 Rule 13d-1(d) HC VIII Sponsor LLC NV 0 10183515 0 10183515 10183515 N 29.7 OO (1) The aggregate amount beneficially owned by HC VIII Sponsor LLC consists of (i) 671,000 Class A Ordinary Shares held directly by HC VIII Sponsor LLC and (ii) 9,512,515 Class A Ordinary Shares HC VIII Sponsor LLC has the right to acquire upon conversion of 9,512,515 Class B Ordinary Shares. This amount excludes 55,917 Class A Ordinary Shares that may be acquired by HC VIII Sponsor LLC upon the conversion of 671,000 rights (included in the private placement units held by HC VIII Sponsor LLC) (the "Rights") upon consummation of the Issuer's initial business combination, because HC VIII Sponsor LLC does not have the right to acquire beneficial ownership of such Class A Ordinary Shares within sixty days. (2) The percentage of the Class A Ordinary Shares reported beneficially owned by HC VIII Sponsor LLC is based on (i) 24,821,000 Class A Ordinary Shares outstanding as of March 30, 2026, as reported in the Issuer's annual report on Form 10-K filed with the Securities and Exchange Commission (the "Commission") on March 30, 2026, and (ii) 9,512,515 Class A Ordinary Shares HC VIII Sponsor LLC has the right to acquire upon conversion of 9,512,515 Class B Ordinary Shares, which shares have been added to the total Class A Ordinary Shares outstanding in accordance with Rule 13d-3(d)(1)(i) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Hennessy Capital Group LLC DE 0 10183515 0 10183515 10183515 N 29.7 OO (1) The aggregate amount beneficially owned by Hennessy Capital Group LLC consists of (i) 671,000 Class A Ordinary Shares held directly by HC VIII Sponsor LLC and (ii) 9,512,515 Class A Ordinary Shares HC VIII Sponsor LLC has the right to acquire upon conversion of 9,512,515 Class B Ordinary Shares. This amount excludes 55,917 Class A Ordinary Shares that may be acquired by HC VIII Sponsor LLC upon the conversion of 671,000 Rights upon consummation of the Issuer's initial business combination, because HC VIII Sponsor LLC does not have the right to acquire beneficial ownership of such Class A Ordinary Shares within sixty days. (2) The percentage of the Class A Ordinary Shares reported beneficially owned by Hennessy Capital Group LLC is based on (i) 24,821,000 Class A Ordinary Shares outstanding as of March 30, 2026, as reported in the Issuer's annual report on Form 10-K filed with the Commission on March 30, 2026, and (ii) 9,512,515 Class A Ordinary Shares HC VIII Sponsor LLC has the right to acquire upon conversion of 9,512,515 Class B Ordinary Shares, which shares have been added to the total Class A Ordinary Shares outstanding in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act. HENNESSY DANIEL J X1 0 10183515 0 10183515 10183515 N 29.7 IN (1) The aggregate amount beneficially owned by Daniel J. Hennessy consists of (i) 671,000 Class A Ordinary Shares held directly by HC VIII Sponsor LLC and (ii) 9,512,515 Class A Ordinary Shares HC VIII Sponsor LLC has the right to acquire upon conversion of 9,512,515 Class B Ordinary Shares. This amount excludes 55,917 Class A Ordinary Shares that may be acquired by HC VIII Sponsor LLC upon the conversion of 671,000 Rights upon consummation of the Issuer's initial business combination, because HC VIII Sponsor LLC does not have the right to acquire beneficial ownership of such Class A Ordinary Shares within sixty days. (2) The percentage of the Class A Ordinary Shares reported beneficially owned by Daniel J. Hennessy is based on (i) 24,821,000 Class A Ordinary Shares outstanding as of March 30, 2026, as reported in the Issuer's annual report on Form 10-K filed with the Commission on March 30, 2026, and (ii) 9,512,515 Class A Ordinary Shares HC VIII Sponsor LLC has the right to acquire upon conversion of 9,512,515 Class B Ordinary Shares, which shares have been added to the total Class A Ordinary Shares outstanding in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act. Hennessy Thomas D X1 750000 10183515 750000 10183515 10933515 N 31.2 IN (1) The sole voting power and sole dispositive power beneficially owned by Thomas D. Hennessy consists of 750,000 Class A Ordinary Shares Thomas D. Hennessy has the right to acquire upon conversion of 750,000 Class B Ordinary Shares. (2) The aggregate amount beneficially owned by Thomas D. Hennessy consists of (i) 671,000 Class A Ordinary Shares held directly by HC VIII Sponsor LLC, (ii) 9,512,515 Class A Ordinary Shares HC VIII Sponsor LLC has the right to acquire upon conversion of 9,512,515 Class B Ordinary Shares, and (iii) 750,000 Class A Ordinary Shares Thomas D. Hennessy has the right to acquire upon conversion of 750,000 Class B Ordinary Shares. This amount excludes 55,917 Class A Ordinary Shares that may be acquired by HC VIII Sponsor LLC upon the conversion of 671,000 Rights upon consummation of the Issuer's initial business combination, because HC VIII Sponsor LLC does not have the right to acquire beneficial ownership of such Class A Ordinary Shares within sixty days. (3) The percentage of the Class A Ordinary Shares reported beneficially owned by Thomas D. Hennessy is based on (i) 24,821,000 Class A Ordinary Shares outstanding as of March 30, 2026, as reported in the Issuer's annual report on Form 10-K filed with the Commission on March 30, 2026, (ii) 9,512,515 Class A Ordinary Shares HC VIII Sponsor LLC has the right to acquire upon conversion of 9,512,515 Class B Ordinary Shares, and (iii) 750,000 Class A Ordinary Shares Thomas D. Hennessy has the right to acquire upon conversion of 750,000 Class B Ordinary Shares, each of (ii) and (iii) having been added to the total Class A Ordinary Shares outstanding in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act. Hennessy Capital Investment Corp. VIII 195 US Hwy 50, Suite 207, Zephyr Cove, Nevada, 89448 This statement is filed on behalf of HC VIII Sponsor LLC, Hennessy Capital Group LLC, Daniel J. Hennessy, and Thomas D. Hennessy (collectively, the "Reporting Persons"). Hennessy Capital Group LLC is the sole manager of HC VIII Sponsor LLC. Daniel J. Hennessy and Thomas D. Hennessy are the managing members of Hennessy Capital Group LLC. Consequently, each of Hennessy Capital Group LLC, Daniel J. Hennessy, and Thomas D. Hennessy may be deemed the beneficial owner of securities held by HC VIII Sponsor LLC and has shared voting and dispositive power over such securities. 195 US Hwy 50, Suite 207, Zephyr Cove, NV 89448 HC VIII Sponsor LLC is a Nevada limited liability company. Hennessy Capital Group LLC is a Delaware limited liability company. Each of Daniel J. Hennessy and Thomas D. Hennessy is a citizen of the United States of America. Y As of March 31, 2026, each of HC VIII Sponsor LLC, Hennessy Capital Group LLC, and Daniel J. Hennessy may be deemed the beneficial owner of 10,183,515 Class A Ordinary Shares, consisting of (i) 671,000 Class A Ordinary Shares held directly by HC VIII Sponsor LLC and (ii) 9,512,515 Class A Ordinary Shares HC VIII Sponsor LLC has the right to acquire upon conversion of 9,512,515 Class B Ordinary Shares. As of March 31, 2026, Thomas D. Hennessy may be deemed the beneficial owner of 10,933,515 Class A Ordinary Shares, consisting of (i) 671,000 Class A Ordinary Shares held directly by HC VIII Sponsor LLC, (ii) 9,512,515 Class A Ordinary Shares HC VIII Sponsor LLC has the right to acquire upon conversion of 9,512,515 Class B Ordinary Shares, and (iii) 750,000 Class A Ordinary Shares Thomas D. Hennessy has the right to acquire upon conversion of 750,000 Class B Ordinary Shares. The amount beneficially owned by each Reporting Person excludes 55,917 Class A Ordinary Shares that may be acquired by HC VIII Sponsor LLC upon the conversion of 671,000 Rights upon consummation of the Issuer's initial business combination, because HC VIII Sponsor LLC does not have the right to acquire beneficial ownership of such Class A Ordinary Shares within sixty days. As of March 31, 2026, each of HC VIII Sponsor LLC, Hennessy Capital Group LLC, and Daniel J. Hennessy may be deemed the beneficial owner of approximately 29.7% of the Class A Ordinary Shares outstanding. This percentage is based on (i) 24,821,000 Class A Ordinary Shares outstanding as of March 30, 2026, as reported in the Issuer's annual report on Form 10-K filed with the Commission on March 30, 2026, and (ii) 9,512,515 Class A Ordinary Shares HC VIII Sponsor LLC has the right to acquire upon conversion of 9,512,515 Class B Ordinary Shares, which shares have been added to the total Class A Ordinary Shares outstanding in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act. As of March 31, 2026, Thomas D. Hennessy may be deemed the beneficial owner of approximately 31.2% of the Class A Ordinary Shares outstanding. This percentage is based on (i) 24,821,000 Class A Ordinary Shares outstanding as of March 30, 2026, as reported in the Issuer's annual report on Form 10-K filed with the Commission on March 30, 2026, (ii) 9,512,515 Class A Ordinary Shares HC VIII Sponsor LLC has the right to acquire upon conversion of 9,512,515 Class B Ordinary Shares, and (iii) 750,000 Class A Ordinary Shares Thomas D. Hennessy has the right to acquire upon conversion of 750,000 Class B Ordinary Shares, each of (ii) and (iii) having been added to the total Class A Ordinary Shares outstanding in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act. HC VIII Sponsor LLC: 0 Hennessy Capital Group LLC: 0 Daniel J. Hennessy: 0 Thomas D. Hennessy: 750,000 HC VIII Sponsor LLC: 10,183,515 Hennessy Capital Group LLC: 10,183,515 Daniel J. Hennessy: 10,183,515 Thomas D. Hennessy: 10,183,515 HC VIII Sponsor LLC: 0 Hennessy Capital Group LLC: 0 Daniel J. Hennessy: 0 Thomas D. Hennessy: 750,000 HC VIII Sponsor LLC: 10,183,515 Hennessy Capital Group LLC: 10,183,515 Daniel J. Hennessy: 10,183,515 Thomas D. Hennessy: 10,183,515 Y Y Y Y Y Y Exhibit 1: Joint Filing Agreement HC VIII Sponsor LLC /s/ Daniel J. Hennessy 05/12/2026 Hennessy Capital Group LLC /s/ Daniel J. Hennessy 05/12/2026 HENNESSY DANIEL J /s/ Daniel J. Hennessy 05/12/2026 Hennessy Thomas D /s/ Thomas D. Hennessy 05/12/2026