Churchill Sponsor IX LLC - 18 Sep 2025 SCHEDULE 13D/A Report for Churchill Capital Corp IX Class A Ordinary Shares, $0.0001 par value (CCIX)

Filing manager: Churchill Sponsor IX LLC
Reporting owner: Churchill Sponsor IX LLC
Security: Churchill Capital Corp IX Class A Ordinary Shares, $0.0001 par value
Beneficially owned shares: 7,912,500 shares
Large-stake signal: Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
Ownership
22%
Beneficial ownership of this reported class.
Shares
7,912,500 shares
Shares beneficially owned as disclosed.
Event date
18 Sep 2025
Date tied to the ownership event or amendment.
Accepted by SEC
22 Sep 2025
EDGAR 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: 22%
Symbol: CCIX
Shares outstanding: 36,631,944 shares
SEC form: SCHEDULE 13D/A
Accepted by SEC: 22 Sep 2025, 19:15:42 UTC
Event date: 18 Sep 2025
Prior SEC filing: 10 Jun 2025
Source filing: View source filing

Key filing fact

Churchill Sponsor IX LLC disclosed 22% ownership in Churchill Capital Corp IX Class A Ordinary Shares, $0.0001 par value (CCIX) on 18 Sep 2025.

Key facts

Churchill Sponsor IX LLC filed SCHEDULE 13D/A for Churchill Capital Corp IX Class A Ordinary Shares, $0.0001 par value (CCIX).
Disclosed ownership: 22%.
Date of event: 18 Sep 2025.

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.

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

Reporting persons

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
Churchill Sponsor IX LLC	22%	7,912,500	7,912,500	0	By: M Klein Associates, Inc., its managing member /s/ Jay Taragin	Jay Taragin / Authorized Signatory	0001848785
M. Klein Associates, Inc.	22%	7,912,500	0	7,912,500	/s/ Jay Targin	Jay Taragin / Authorized Signatory
Michael Klein	22%	7,912,500	0	7,912,500	/s/ Michael Klein	Michael Klein

CIK / CUSIP context first

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