SCHEDULE 13G

QUARTZSEA ACQUISITION CORP

Class A Common Stock · CUSIP: G7314B112

Event date: 2025-03-18

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Harraden Circle Investments, LLC

  Shares: 993,800 · Class: 8.71%

• Harraden Circle Investors GP, LP

  Shares: 977,176 · Class: 8.56%

• Harraden Circle Investors GP, LLC

  Shares: 977,176 · Class: 8.56%

• Harraden Circle Investors, LP

  Shares: 352,990 · Class: 3.09%

• Harraden Circle Special Opportunities, LP

  Shares: 206,828 · Class: 1.81%

• Harraden Circle Strategic Investments, LP

  Shares: 417,358 · Class: 3.66%

• Frederick V. Fortmiller, Jr.

  Shares: 993,800 · Class: 8.71%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.