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Institutional ownership intelligence
Schedule 13G/A

CGEM Schedule 13G/A filing by Citadel Advisors

Citadel Advisors reported beneficial ownership of 2.0M shares, representing 3.4% of Cullinan Therapeutics, Inc. in this filing.

FiledNov 14, 2025
Ownership dateSep 30, 2025
Reported shares2.0M
Reported ownership3.4%
Ownership details

Voting and dispositive power reported in the filing

These figures describe the reporting filer’s disclosed voting and investment authority. They should be read together with the reported share count and percentage.

Sole voting power 0
Shared voting power 2.0M
Sole dispositive power 0
Shared dispositive power 2.0M
Compared with the prior filing

How the reported position changed

This compares the current filing with the previous tracked Schedule 13 filing from the same reporting CIK for CGEM. A change between filings does not by itself establish when shares were bought or sold.

Previous filingAug 6, 2025
Reported share change-1,020,219
Ownership percentage change-1.7 pts
Previous filingThis filing
Reported shares3.0M2.0M
Reported ownership5.1%3.4%
Price context

Price dates alongside the ownership filing

Price data provides market context around the disclosure. It does not identify the filer’s actual transaction price.

Close near filing date$8.55as of Nov 14, 2025
Latest tracked price$17.55as of Aug 4, 2026
Source

Original filing and accession

Use the SEC filing as the primary source when you need the complete disclosure, footnotes, exhibits, or reporting-person details.

Reporting filer
Citadel Advisors
CIK
CIK0001423053
Accession
0001104659-25-112463
Form
Schedule 13G/A
Read the filing in context

Understand what a Schedule 13 filing does—and does not—tell you.