Sealsq Corp
Other Technology · Cointrin, Switzerland
Sealsq Corp is a other technology company based in Cointrin, Switzerland, incorporated in 2022. It has reported $135.2 million raised across 4 Form D filings with the SEC, most recently in 2025.
SEALSQ provides sovereign end-to-end security infrastructure, from secure semiconductors and trusted communications to quantum technologies, and hardware root of trust.
| Date | Round | Amount | Raised to date | Lead investor | Source |
|---|---|---|---|---|---|
| 2025-10-22 | — | $105.2M | $135.2M | SEC Form D | |
| 2024-03-11 | — | $10.0M | $30.0M | SEC Form D | |
| 2024-01-17 | — | $10.0M | $20.0M | SEC Form D | |
| 2023-07-21 | — | $10.0M | $10.0M | SEC Form D |
SEC rows are Form D filings, where the amount is what was actually sold and amendments update a round rather than adding one. Press rows are split between company-issued releases or wires and editorial or third-party coverage. The total is therefore a floor: a round nobody reported is a round we cannot see. A buyout or control change appears in the timeline but is never added to the total: that money goes to shareholders, not into the company.
Form D is the notice a company files with the SEC when it sells securities without registering them. It reports the amount sold, not a valuation. Figures here are what the filing says. Where a filing is silent, the field is left blank rather than estimated. “Total raised” adds press-reported rounds that never appear in a filing, so it is a floor rather than an audited sum: press amounts are the figures the company announced, and a round nobody reported is a round we cannot see.