Frederik W. Mohn - 22 May 2026 Form 4 Insider Report for Transocean Ltd. (RIG)

Reporting relationship: Director
Issuer ticker: RIG
Reported as of: 22 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 27 May 2026, 18:44:40 UTC
Prior SEC filing: 25 Nov 2025
Source filing: View source filing
Reporting owner signature: /s/ Debra Kupferman by Power of Attorney

Key filing fact

Frederik W. Mohn filed Form 4 for Transocean Ltd. (RIG) on 27 May 2026.

Key facts

This page summarizes Frederik W. Mohn's Form 4 filing for Transocean Ltd. (RIG).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 27 May 2026, 18:44.

Change

Previous filing in this sequence was filed on 25 Nov 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001729638 Primary reporting owner

Mohn Frederik Wilhelm

Relationship: Director
Address: TURMSTRASSE 30, STEINHAUSEN, SWITZERLAND
Signature: /s/ Debra Kupferman by Power of Attorney
Signature date: 27 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

RIG transaction

Registered Shares

Options Exercise

Transaction value
Shares: +82,353
Change %: +372%
Price: $6.81^*
Shares after: 104,501
Date: 22 May 2026
Ownership: Direct
Footnotes: F1

RIG transaction

Registered Shares

Tax liability

Transaction value
Shares: -25,597
Change %: -24%
Price: $6.70^*
Shares after: 78,904
Date: 26 May 2026
Ownership: Direct
Footnotes: F2

RIG holding

Registered Shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 96,574,894
Date: 22 May 2026
Ownership: By Perestroika (Cyprus) Ltd.
Footnotes: F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

RIG transaction Derivative

Restricted Units

Award

Transaction value
Shares: +30,435
Change %
Price: $0.000000^*
Shares after: 30,435
Date: 22 May 2026
Ownership: Direct
Underlying class: Registered Shares
Underlying amount: 30,435
Exercise price: $0.000000
Footnotes: F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

Restricted Units, which are 1-for-1 share equivalents, acquired on May 30, 2025, pursuant to the Issuer's long-term incentive plan. The restricted share units vested on May 22, 2026, and the reporting person elected not to defer the receipt of the registered shares.

Footnote F2

Shares sold upon vesting to satisfy tax withholding obligations.

Footnote F3

These securities are held directly by Perestroika (Cyprus) Ltd., which is a wholly owned subsidiary of Perestroika AS. Mr. Frederik Mohn is the sole director and owner of Perestroika AS and is the indirect beneficial owner of all securities owned by Perestroika AS.

Footnote F4

Restricted Units, which are 1-for-1 registered share equivalents, were acquired on May 22, 2026, pursuant to the Issuer's long-term incentive plan. Restricted Units vest on the earlier of: (i) May 22, 2027, or (ii) the date of the next Annual General Meeting of the Company's shareholders following the May 22, 2026 grant date. Such Restricted Units will be payable in registered shares of the Issuer following the applicable vesting date, pursuant to the terms and conditions of the award.