# Halcyon Carbon, Inc. — Form D

Halcyon Carbon, Inc. of SAN FRANCISCO, CA, a company, filed a Form D exempt-offering notice with the SEC on 2026-03-11. The offering totals $21.0M, of which $21.0M was reported sold. Industry: Other Technology.

## Offering

- Filed: 2026-03-11
- Form: D
- Accession: 0002118358-26-000001
- Industry: Other Technology
- Exemptions: 06b
- Total offering: $21.0M
- Amount sold: $21.0M
- Minimum investment: $1
- Investors: 14
- Date of first sale: 2026-02-24
- Security types: equity
- Revenue range: Decline to Disclose
- SEC file number: 021-576173

## Issuer

- Name: Halcyon Carbon, Inc.
- CIK: 0002118358
- Entity type: Corporation
- Jurisdiction: DELAWARE
- Incorporated: 2023
- Address: 755 SANSOME ST, SAN FRANCISCO, CA, 94111
- Phone: 650-392-4367

## Officers, directors & promoters (6)

| Name | Role | Location |
| --- | --- | --- |
| Nathaniel Bullard | Director | San Francisco, CA |
| Tanuj Dutta | Director | Louisville, CO |
| Bruce Falck | Director | San Francisco, CA |
| Tyler Lancaster | Director | San Francisco, CA |
| Bruce Falck | Executive Officer | San Francisco, CA |
| Bruce Falck | Promoter | San Francisco, CA |

## More

- [CIK 2118358 on SEC EDGAR (source of record)](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=2118358&type=&dateb=&owner=include&count=40)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/formd/0002118358-26-000001.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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