CITADEL ADVISORS LLC - 30 Sep 2025 SCHEDULE 13G/A Report for Cabaletta Bio, Inc. Common stock, par value $0.00001 per share (the "Shares") (CABA)

Filing Manager
CITADEL ADVISORS LLC
Reporting Manager
Kenneth Griffin
Security
Cabaletta Bio, Inc. Common stock, par value $0.00001 per share (the "Shares")
Symbol
CABA
Shares outstanding
92,655,147 shares
Disclosed Ownership
3,150,275 shares
Ownership
3.4%
Form type
SCHEDULE 13G/A
Filing time
14 Nov 2025, 16:09:49 UTC
Date of event
30 Sep 2025
Previous filing
20 Jun 2025
SEC
View on sec.gov

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Quoteable Key Fact

"CITADEL ADVISORS LLC disclosed 3.4% ownership in Cabaletta Bio, Inc. Common stock, par value $0.00001 per share (the "Shares") (CABA) on 30 Sep 2025."

Quick Takeaways

  • CITADEL ADVISORS LLC filed SCHEDULE 13G/A for Cabaletta Bio, Inc. Common stock, par value $0.00001 per share (the "Shares") (CABA).
  • Disclosed ownership: 3.4%.
  • Date of event: 30 Sep 2025.

What Changed

  • Previous schedule filing date: 20 Jun 2025.
  • Current filing was accepted on 14 Nov 2025, 16:09.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Official SEC Source

Backed by Schedule 13D/13G

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

See Original Filing

Reporting Managers (7)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Citadel Advisors LLC 3.1% 2,905,465 0 2,905,465 /s/ Seth Levy Seth Levy, Authorized Signatory
Citadel Advisors Holdings LP 3.1% 2,905,465 0 2,905,465 /s/ Seth Levy Seth Levy, Authorized Signatory
Citadel GP LLC 3.1% 2,905,465 0 2,905,465 /s/ Seth Levy Seth Levy, Authorized Signatory
Citadel Securities LLC 0.3% 244,810 0 244,810 /s/ Seth Levy Seth Levy, Authorized Signatory
Citadel Securities Group LP 0.3% 244,810 0 244,810 /s/ Seth Levy Seth Levy, Authorized Signatory
Citadel Securities GP LLC 0.3% 244,810 0 244,810 /s/ Seth Levy Seth Levy, Authorized Signatory
Kenneth Griffin 3.4% 3,150,275 0 3,150,275 /s/ Seth Levy Seth Levy, attorney-in-fact*

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