Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
Frederik W. Mohn - 30 Sep 2025 SCHEDULE 13D/A Report for TRANSOCEAN LTD. Shares, $0.10 par value (RIG)
- Filing manager
- Frederik W. Mohn
- Reporting owner
- Frederik W. Mohn
- Beneficially owned shares
- 95,418,301 shares
- Large-stake signal
-
Ownership
10%Beneficial ownership of this reported class.
Shares
95,418,301 sharesShares beneficially owned as disclosed.
Event date
30 Sep 2025Date tied to the ownership event or amendment.
Accepted by SEC
30 Sep 2025EDGAR acceptance date.
How to read this large-stake filing
- Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
- Compare this filing with the holder history and issuer page before treating the percentage as a current position.
- Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
- Class ownership
- 10%
- Symbol
- RIG
- Shares outstanding
- 944,735,653 shares
- SEC form
- SCHEDULE 13D/A
- Accepted by SEC
- 30 Sep 2025, 21:38:19 UTC
- Event date
- 30 Sep 2025
- Next SEC filing
- 11 Feb 2026
- Source filing
- View source filing
Ownership signal
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Subject security
Names, identifiers, and filing context for this profile.
2 source fields
Source evidence
Original filing metadata and source links for verification.
5 source fields
Key filing fact
Frederik W. Mohn disclosed 10% ownership in TRANSOCEAN LTD. Shares, $0.10 par value (RIG) on 30 Sep 2025.
Key facts
- Frederik W. Mohn filed SCHEDULE 13D/A for TRANSOCEAN LTD. Shares, $0.10 par value (RIG).
- Disclosed ownership: 10%.
- Date of event: 30 Sep 2025.
Change
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 30 Sep 2025, 21:38.
Research use
- This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
- Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.
Evidence
Backed by Schedule 13D/13G
View source filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Disclosed reporting parties (3)
Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.
| Name | Ownership | Shares owned | Sole voting power | Shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Frederik W. Mohn | 10% | 95,418,301 | 343,407 | 95,074,894 | /s/ Frederik W. Mohn | Frederik W. Mohn | 0001729638 |
| Perestroika AS | 10% | 95,074,894 | 0 | 95,074,894 | /s/ Frederik W. Mohn | Chairman and Sole Director | 0001729635 |
| Perestroika (Cyprus) Ltd | 10% | 95,074,894 | 0 | 95,074,894 | /s/ Frederik W. Mohn | Director | 0001737912 |
CIK / CUSIP context first