Frederik W. Mohn - 26 Sep 2025 Form 4 Insider Report for Transocean Ltd. (RIG)

Role: Director, 10%+ Owner
Signature: /s/ Daniel Ro-Trock by Power of Attorney
Issuer symbol: RIG
Transactions as of: 26 Sep 2025
Net transactions value: +$12,200,000
Form type: 4
Filing time: 30 Sep 2025, 21:41:09 UTC
Previous filing: 02 Jun 2025
Next filing: 25 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Mohn Frederik Wilhelm	Director, 10%+ Owner	TURMSTRASSE 30, STEINHAUSEN, SWITZERLAND	/s/ Daniel Ro-Trock by Power of Attorney	30 Sep 2025	0001729638

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	RIG	Registered Shares	Purchase	$12,200,000	+4,000,000	+4.4%	$3.05	95,074,894	26 Sep 2025	By Perestroika (Cyprus) Ltd.	F1, F2
holding	RIG	Registered Shares						22,148	26 Sep 2025	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The transaction reported herein was made in connection with a registered public offering of securities at the reported public offering price offered by the Issuer, as described in the Issuer's prospectus supplement filed with the U.S. Securities and Exchange Commission on September 26, 2025.
F2	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.