NASDAQ: CISS

C3is Inc.

CIK 0001951067 · SIC 4412 · Deep Sea Foreign Transportation

Micro Revenue $35M Assets $98M as of Sep 6, 2026

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424B3 Filed Jul 28, 2026

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424B3 Filed Jul 28, 2026

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424B3 Filed Jul 28, 2026

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424B4 Filed Jul 28, 2026 Red flag

C3is Inc. prices $5.7M net proceeds offering of common shares at $1.00 per share

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424B5 Filed Feb 25, 2026

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424B4 Filed Dec 11, 2025 Red flag

C3is Inc. prices $8M best-efforts offering of units at $1.20, with net proceeds of $1.7M to company

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424B5 Filed Oct 9, 2025

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424B4 Filed Mar 15, 2024

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424B1 Filed Jun 12, 2023

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View all filings for CISS on SEC EDGAR