As of November 6, 2026, one holder's latest Schedule 13D or 13G filing report owning 5% or more of Transocean Ltd. The largest reported stake is Frederik W. Mohn's, at 8.8%. 4 filings are on record since August 14, 2025 (Schedule 13D/A, February 11, 2026).
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Key facts
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
- · Holder: Frederik W. Mohn · Percent: 8.8% · SCHEDULE 13D/A
- · Holder: Frederik W. Mohn · Percent: 10.1% · SCHEDULE 13D/A
- · Holder: Primecap Management Co · Percent: 1.49% · SCHEDULE 13G/A
Transocean Ltd has 4 Schedule 13D or 13G filings on record since 2025-08-14. 1 holder's latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 8.8% | 96,918,301 | SCHEDULE 13D/A, 2026-02-11 | 2026-02-09 | |
| Primecap Management Co | 1.49% | 13,126,722 | SCHEDULE 13G/A, 2025-08-14 | 2025-06-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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More on Transocean Ltd and the records around it.
Transocean Ltd elsewhere on the record
Companies that share a holder
- PRIMECAP MANAGEMENT CO/CA/ also filed stake reports on 24 other companies: Xencor Inc (Nov 2026), GRAIL, Inc. (Nov 2026), MARKETAXESS HOLDINGS INC (Nov 2026)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
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Purpose of Transaction (Item 4)
Frederik W. Mohn
Item 4 of the Prior Schedule 13D is hereby amended and supplemented by adding the following at the end thereof: On February 9, 2026, the Issuer and Valaris Limited, an exempted company limited by shares incorporated under the laws of Bermuda ("Valaris") (the Issuer and Valaris, collectively, the "Parties" and each, a "Party"), entered into a Business Combination Agreement (the "Agreement") providing for the combination of the two Parties. Pursuant to the Agreement, and on the terms and subject to the conditions thereof, the Issuer will acquire of all the issued and outstanding common shares, par value $0.01 each, of Valaris (the "Valaris Shares") in exchange for Shares, at an exchange ratio of 15.235 Shares for each Valaris Share. In connection with the execution of the Agreement, the Reporting Persons entered into a Support Agreement with Valaris (the "Support Agreement"). The Support Agreement provides, on the terms and subject to the conditions thereof, that each Reporting Person will vote the Shares owned by such Reporting Person at the time of the applicable shareholder meeting in favor of the transactions contemplated by the Agreement. The disclosure contained under the heading "Support Agreement" in Item 6 is incorporated herein by reference.Item 4 of the SCHEDULE 13D/A filed 2026-02-11
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-14 | Primecap Management Co | 1.49% | SCHEDULE 13G/A |
| 2025-09-30 | Frederik W. Mohn | 10.1% | SCHEDULE 13D/A |
| 2026-02-11 | Frederik W. Mohn | 8.8% | SCHEDULE 13D/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
Questions about who owns Transocean Ltd
Who owns Transocean Ltd?
On this page, one holder's latest ownership filing reports 5% or more of Transocean Ltd: Frederik W. Mohn (8.8%, Schedule 13D/A, filed 2026-02-11).
When did Frederik W. Mohn buy into Transocean Ltd?
The filings give report dates, not purchase dates. The earliest filing from Frederik W. Mohn on this page is the Schedule 13D/A, filed 2025-09-30, reporting 10.1%; its latest, Schedule 13D/A filed 2026-02-11, reports 8.8%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 4 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.