Cabaletta Bio Inc

CUSIP 12674W109COMCABAQ1 2026

13D / 13G Filings

Schedule 13D/13G on record

Beneficial Filers

Distinct reporting persons

Largest Stake

15.2%

Max % of class reported

Institutional Holders

104

13F filers (latest quarter)

87 filings · latest Feb 18, 2026

#	Filed	Reporting Person	Form	% of Class	Shares	Filing
1	Feb 18, 2026	Millennium Management LLC	13G	11.0%	5.13M	SEC
2	Feb 17, 2026	T. Rowe Price Investment Management, Inc.	13G/A	10.2%	9.86M	SEC
3	Feb 17, 2026	Alyeska Investment Group, L.P.	13G/A	4.7%	4.50M	SEC
4	Feb 17, 2026	Cormorant Asset Management, LP	13G/A	9.3%	9.40M	SEC
5	Nov 14, 2025	Alyeska Investment Group, L.P.	13G/A	6.0%	5.80M	SEC
6	Nov 14, 2025	Cormorant Asset Management, LP	13G/A	10.0%	9.59M	SEC
7	Nov 14, 2025	Citadel Advisors LLC	13G/A	3.4%	3.15M	SEC
8	Nov 7, 2025	T. Rowe Price Investment Management, Inc.	13G/A	11.3%	10.36M	SEC
9	Nov 7, 2025	T. Rowe Price Investment Management, Inc.	13G/A	9.1%	8.36M	SEC
10	Nov 7, 2025	Prudential Financial Inc	13G/A	8.9%	12.58M	SEC

See the full Schedule 13D/13G history for Cabaletta Bio Inc.

Largest reported positions · latest quarter

#	Fund	Shares	Value
1	Bain Capital Life Sciences Investors, LLC	9.68M	$26.03M
2	Jennison Associates LLC	8.97M	$24.13M
3	Adage Capital Partners Gp, L.L.C.	8.83M	$23.75M
4	Millennium Management LLC	5.90M	$15.88M
5	Cormorant Asset Management, LP	5.50M	$14.79M
6	Two Sigma Investments, LP	2.50M	$6.72M
7	Blackrock, Inc.	2.37M	$6.38M
8	Marshall Wace, LLP	2.18M	$5.86M
9	Renaissance Technologies LLC	2.04M	$5.48M
10	Qube Research & Technologies Ltd	1.93M	$5.21M