Cabaletta Bio, Inc.
US ˙ NasdaqGS ˙ US12674W1099

SecurityCABA / Cabaletta Bio, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership238,442 shares
Latest Disclosed Value $ 641,409
Northern Trust Corp ownership in CABA / Cabaletta Bio, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 238,442 shares of Cabaletta Bio, Inc. (US:CABA) valued at $641,409 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 238,442 shares of Cabaletta Bio, Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $771,360 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F CABALETTA BIO COM 12674W109 238,442 0 0.00 641 22.80 0.0000
2026-02-17 2025-12-31 13F CABALETTA BIO COM 12674W109 238,442 11,455 5.05 522 -1.69 0.0001
2025-11-14 2025-09-30 13F CABALETTA BIO COM 12674W109 226,987 93,967 70.64 531 162.87 0.0001
2025-08-13 2025-06-30 13F CABALETTA BIO COM 12674W109 133,020 -266,746 -66.73 202 -63.47 0.0000
2025-05-13 2025-03-31 13F CABALETTA BIO COM 12674W109 399,766 17,611 4.61 554 -36.22 0.0001
2025-02-14 2024-12-31 13F CABALETTA BIO COM 12674W109 382,155 -5,849 -1.51 867 -52.65 0.0001
2024-11-13 2024-09-30 13F CABALETTA BIO COM 12674W109 388,004 81,596 26.63 1,831 -20.08 0.0003
2024-08-14 2024-06-30 13F CABALETTA BIO COM 12674W109 306,408 2,247 0.74 2,292 -55.84 0.0004
2024-05-14 2024-03-31 13F CABALETTA BIO COM 12674W109 304,161 -6,511 -2.10 5,189 -26.43 0.0009
2024-02-13 2023-12-31 13F CABALETTA BIO COM 12674W109 310,672 10,903 3.64 7,052 54.58 0.0013
2023-11-13 2023-09-30 13F CABALETTA BIO COM 12674W109 299,769 85,287 39.76 4,562 64.81 0.0009
2023-08-11 2023-06-30 13F CABALETTA BIO COM 12674W109 214,482 174,335 434.24 2,769 733.73 0.0005
2023-05-15 2023-03-31 13F CABALETTA BIO COM 12674W109 40,147 5,951 17.40 332 5.06 0.0001
2023-02-13 2022-12-31 13F CABALETTA BIO COM 12674W109 34,196 4,889 16.68 316 1,563.16 0.0001
2022-11-14 2022-09-30 13F CABALETTA BIO COM 12674W109 29,307 0 0.00 19 -38.71 0.0000
2022-08-12 2022-06-30 13F CABALETTA BIO COM 12674W109 29,307 0 0.00 31 -47.46 0.0000
2022-05-13 2022-03-31 13F CABALETTA BIO COM 12674W109 29,307 0 0.00 59 -46.85 0.0000
2022-02-08 2021-12-31 13F CABALETTA BIO COM 12674W109 29,307 4,337 17.37 111 -63.49 0.0000
2021-11-15 2021-09-30 13F CABALETTA BIO COM 12674W109 24,970 -551 -2.16 304 38.81 0.0001
2021-08-13 2021-06-30 13F CABALETTA BIO COM 12674W109 25,521 -104,647 -80.39 219 -84.84 0.0000
2021-05-12 2021-03-31 13F CABALETTA BIO COM 12674W109 130,168 -9,457 -6.77 1,445 -17.05 0.0003
2021-02-11 2020-12-31 13F CABALETTA BIO COM 12674W109 139,625 -5,074 -3.51 1,742 11.03 0.0003
2020-11-16 2020-09-30 13F CABALETTA BIO COM 12674W109 144,699 14,073 10.77 1,569 7.84 0.0003
2020-08-14 2020-06-30 13F CABALETTA BIO COM 12674W109 130,626 33,191 34.06 1,455 104.35 0.0003
2020-05-14 2020-03-31 13F CABALETTA BIO COM 12674W109 97,435 30,204 44.93 712 -24.17 0.0002
2020-02-14 2019-12-31 13F CABALETTA BIO COM 12674W109 67,231 67,231 939 0.0002
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.