Centessa Pharmaceuticals (CNTA): Index Ventures entities report 0% beneficial ownership

Rhea-AI Filing Summary

Centessa Pharmaceuticals plc received an amended beneficial ownership report from Index Ventures Life VI (Jersey) L.P., Yucca (Jersey) SLP, and Index Venture Life Associates VI Ltd. As of June 30, 2026, these reporting persons collectively report beneficial ownership of 0 Ordinary Shares of Centessa, representing 0.0% of the outstanding class. They report no sole or shared voting power and no sole or shared dispositive power over any Ordinary Shares.

Key Figures

Beneficially owned shares: 0 Ordinary Shares Percent of class owned: 0.0% Sole voting power: 0 shares +3 more

6 metrics

Beneficially owned shares 0 Ordinary Shares Beneficial ownership reported as of June 30, 2026

Percent of class owned 0.0% Percent of Centessa Ordinary Shares reported as of June 30, 2026

Sole voting power 0 shares Sole power to vote or direct the vote reported by each reporting person

Shared voting power 0 shares Shared power to vote or direct the vote reported by each reporting person

Sole dispositive power 0 shares Sole power to dispose or direct disposition reported by each reporting person

Shared dispositive power 0 shares Shared power to dispose or direct disposition reported by each reporting person

Key Terms

beneficially own, Sole Voting Power, Shared Dispositive Power, Ownership of 5 percent or less of a class

4 terms

beneficially own financial

"none of the Reporting Persons may be deemed to beneficially own any Ordinary Shares"

Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.

Sole Voting Power financial

"5 | Sole Voting Power 0.00 6 | Shared Voting Power 0.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

Shared Dispositive Power financial

"7 | Sole Dispositive Power 0.00 8 | Shared Dispositive Power 0.00"

Ownership of 5 percent or less of a class financial

"Item 5. | Ownership of 5 Percent or Less of a Class."

FAQ

What does the Schedule 13G/A filing for CNTA report about Index Ventures' ownership?

The Schedule 13G/A reports that Index Ventures Life VI (Jersey) L.P., Yucca (Jersey) SLP and Index Venture Life Associates VI Ltd beneficially own 0 Centessa Ordinary Shares, representing 0.0% of the class as of June 30, 2026.

What percentage of Centessa Pharmaceuticals (CNTA) is reported owned in this 13G/A?

The reporting persons disclose ownership of 0.0% of Centessa’s Ordinary Shares. This is confirmed in the ownership section stating they may not be deemed to beneficially own any Ordinary Shares as of June 30, 2026.

How many Centessa (CNTA) shares do the reporting entities control for voting purposes?

The filing states the reporting entities have 0 shares with sole voting power and 0 shares with shared voting power. They therefore report no voting control over any Centessa Ordinary Shares.

Do the reporting persons have dispositive power over any CNTA shares?

No. The Schedule 13G/A specifies the reporting persons have 0 shares with sole dispositive power and 0 shares with shared dispositive power, indicating no power to dispose of Centessa Ordinary Shares.

What key status does this 13G/A confirm regarding Centessa (CNTA) ownership thresholds?

The filing confirms the reporting persons’ ownership is 5 percent or less of the class. Item 5 explicitly notes “Ownership of 5 percent or less of a class,” aligning with the reported 0.0% beneficial ownership.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/14/2026 - 06:47 AM Accepted by SEC EDGAR 08/14/2026 - 06:47 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Centessa Pharmaceuticals plc

(Name of Issuer)

Ordinary Shares, nominal value 0.002 per share

(Title of Class of Securities)

152309100

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 152309100

1

Names of Reporting Persons

INDEX VENTURES LIFE VI (JERSEY) L.P.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

JERSEY

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0.0 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP Number(s): 152309100

1

Names of Reporting Persons

Yucca (Jersey) SLP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

JERSEY

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0.0 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP Number(s): 152309100

1

Names of Reporting Persons

Index Venture Life Associates VI Ltd

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

JERSEY

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0.0 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Centessa Pharmaceuticals plc
(b)	Address of issuer's principal executive offices: 3rd Floor, 1 Ashley Road, Altrincham Cheshire WA14 2DT United Kingdom
Item 2.
(a)	Name of person filing: (i) Index Ventures Life VI (Jersey) L.P., a Jersey, Channel Islands partnership. (ii) Yucca (Jersey) SLP, a Jersey, Channel Islands separate partnership. (iii) Index Venture Life Associates VI Ltd, a Jersey, Channel Islands corporation, the general partner of the Index Ventures Life VI (Jersey) L.P.
(b)	Address or principal business office or, if none, residence: The address of the principal business office of each of the reporting persons is 44 Esplanade, St. Helier, Jersey, Channel Islands JE4 9WG.
(c)	Citizenship: See Item 2(a).
(d)	Title of class of securities: Ordinary Shares, nominal value 0.002 per share
(e)	CUSIP No.: 152309100
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: As of June 30, 2026, none of the Reporting Persons may be deemed to beneficially own any Ordinary Shares of the Issuer.
(b)	Percent of class: 0.0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.	Certifications:
	Not Applicable

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

INDEX VENTURES LIFE VI (JERSEY) L.P.

Signature:	/s/ Nigel Crocker
Name/Title:	Nigel Crocker, Alternate Director of General Partner
Date:	08/14/2026

Yucca (Jersey) SLP

Signature:	/s/ Nigel Crocker and /s/ Phil King
Name/Title:	Nigel Crocker and Phil King, Authorised Signatories
Date:	08/14/2026

Index Venture Life Associates VI Ltd

Signature:	/s/ Nigel Crocker
Name/Title:	Nigel Crocker, Alternate Director
Date:	08/14/2026