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C-Combinator, A Public Benefit Corp

Makes seaweed-based ingredients for cosmetics and fertilizers for agriculture.

Updated Nov 10, 2026·Latest SEC filing Apr 29, 2026·Suggest an edit

About Carbonwave

Carbonwave is a private company based in Hingham, Massachusetts. It has reported $9,505,656 raised in three offerings on Form D since January 2023.

Funding Rounds (SEC Form D)

First saleFiled with SECAmount soldInvestorsAvg. checkTermsFiling
Apr 10, 2026Apr 29, 2026$205,000of $1.5M target0—Debt, Securities on exerciseRule 506(b)Form D ↗
Jul 10, 2024Aug 8, 2024amended Aug 14, 2024$300,000of $750K target0—Equity, Securities on exerciseRule 506(b)Form D/A ↗2 earlier filings
Dec 19, 2022Jan 24, 2023amended Aug 7, 2023$9,000,656fully sold14$642KEquity, Securities on exerciseRule 506(b)Form D/A ↗1 earlier filing
Total, three offerings$9,505,656

The filing for the offering first filed Apr 29, 2026 reports amount sold with no investors. The filing for the offering first filed Aug 8, 2024 reports amount sold with no investors. Figures are shown as filed.

First sale is the date the first investor in the offering committed to invest. Companies must file Form D within 15 days of that date, so filing dates run later.

Leadership Team

Executive officers and directors listed on Carbonwave's Form D filed Apr 29, 2026.

RE
Robert Ellis
Chief Financial Officer

Earlier filings also listed Geoff Chapin (executive officer, last listed Aug 2023).

Sources

  1. SECC-Combinator, A Public Benefit Corp Form D/A, filed Aug 9, 2024
  2. SECC-Combinator, A Public Benefit Corp Form D, filed Aug 8, 2024
  3. SECC-Combinator, A Public Benefit Corp Form D, filed Jan 24, 2023
  4. SECC-Combinator, A Public Benefit Corp filing history
  5. CompanySay Hello to Carbonwave