Comparable stake leader
JENNISON ASSOCIATES LLC
SEC ownership of Cabaletta Bio, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001759138.
Disclosed value leader
JENNISON ASSOCIATES LLC
Comparable rows
50/50
Latest evidence
31 May 2026
- Public ticker
- CABA on Nasdaq
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
JENNISON ASSOCIATES LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
JENNISON ASSOCIATES LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 May 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001759138
- Issuer location
- Philadelphia, PA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Cabaletta Bio, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
JENNISON ASSOCIATES LLC
Disclosed value leader
JENNISON ASSOCIATES LLC
Comparable rows
50/50
Latest evidence
31 May 2026
13D/G
13F
3/4/5
Lead comparable stake: 11%
13D/G row: JENNISON ASSOCIATES LLC
Showing 1-8 of 50 holder rows.
Quick read
JENNISON ASSOCIATES LLC leads the comparable SEC ownership view at 11%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens JENNISON ASSOCIATES LLC's linked filing trail.
Comparable ownership
Top 5
JENNISON ASSOCIATES LLC
11%
PRUDENTIAL FINANCIAL INC
11%
T. Rowe Price Investment Manageme...
10%
Bain Capital Life Sciences Opport...
10%
Adage Capital Management, L.P.
10%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| JENNISON ASSOCIATES LLC |
13D/G
13F
Company
|
11%
|
$88,092,767
24,267,980 shares
|
+$42,410,898 | 29 May 2026 |
| PRUDENTIAL FINANCIAL INC |
13D/G
|
11%
|
$88,092,767
24,267,980 shares
|
+$42,410,898 | 31 May 2026 |
| T. Rowe Price Investment Management, Inc. |
13F
13D/G
Company
|
10%
from 13D/G
|
$29,806,000
11,080,005 shares
|
— | 31 Mar 2026 |
| Bain Capital Life Sciences Opportunities III, LP |
13D/G
|
10%
|
$15,483,400
9,677,125 shares
|
$0 | 30 Jun 2025 |
| Adage Capital Management, L.P. |
13D/G
|
10%
|
$14,404,128
9,002,580 shares
|
$0 | 30 Jun 2025 |
| Cormorant Asset Management, LP |
13D/G
13F
Company
|
9%
|
$31,605,000
10,500,000 shares
|
+$3,311,000 | 31 Mar 2026 |
| MILLENNIUM MANAGEMENT LLC |
13F
13D/G
Company
|
5.3%
from 13D/G
|
$15,879,826
5,903,281 shares
|
— | 31 Mar 2026 |
| Alyeska Investment Group, L.P. |
13D/G
|
4.7%
|
$9,855,000
4,500,000 shares
|
-$2,847,000 | 31 Dec 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$296,189.
Buys
$296,189
Insiders: 8
Sells
$0
Insiders: 0
Net
+$296,189
Shares: +132,073
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 132,073
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 132,073 | 0 | $296,189 | $0 | +$296,189 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-14 of 14 reporting-owner rows connected to Cabaletta Bio, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
14
Largest Forms 3/4/5 holder
5AM Ventures V, L.P.
Net 12M change
+$296,188
Latest report
09 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| 5AM Ventures V, L.P. | 10%+ Owner | $6,771,685 | Mixed | 01 Nov 2021 | ||
| Nichtberger Steven | President & CEO, Director | $3,104,976 | +$100,778 | +3.4% | Mixed | 02 Mar 2026 |
| Mark Simon | Director | $351,516 | +$25,261 | +7.7% | Mixed | 09 Jun 2026 |
| Gwendolyn Binder | President, Science & Tech. | $68,545 | +$24,763 | +57% | Filing P/S | 02 Mar 2026 |
| Shawn Cline Tomasello | Director | $50,322 | +$50,322 | +100% | Filing P/S | 09 Jun 2026 |
| Steve Gavel | Chief Commercial Officer | $50,215 | +$50,215 | +100% | Filing P/S | 21 Jan 2026 |
| David J. Chang | Chief Medical Officer | $19,887 | +$19,888 | +100% | Filing P/S | 02 Mar 2026 |
| Michael Gerard | General Counsel | $14,979 | +$14,979 | +100% | Filing P/S | 02 Mar 2026 |
| Catherine Bollard | Director | $12,248 | +$9,982 | +441% | Filing P/S | 09 Jun 2026 |
| Richard C. Henriques Jr. | Director | Mixed | 09 Jun 2026 | |||
| Scott C. Brun | Director | Mixed | 09 Jun 2026 | |||
| Arun Das | Chief Business Officer | Mixed | 02 Mar 2026 | |||
| Brian Daniels | Director | Mixed | 01 Jun 2021 | |||
| Anup Marda | Chief Financial Officer | Mixed | 02 Mar 2026 |
Recent insider transactions for Cabaletta Bio, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Shawn Tomasello | CABA | Stock Option (Right to Buy) | Award | 22,000 | 22,000 | 09 Jun 2026 | Direct | |||
| Mark Simon | CABA | Stock Option (Right to Buy) | Award | 22,000 | 22,000 | 09 Jun 2026 | Direct | |||
| Richard C. Henriques Jr. | CABA | Stock Option (Right to Buy) | Award | 22,000 | 22,000 | 09 Jun 2026 | Direct | |||
| Catherine Bollard | CABA | Stock Option (Right to Buy) | Award | 22,000 | 22,000 | 09 Jun 2026 | Direct | |||
| Scott C. Brun | CABA | Stock Option (Right to Buy) | Award | 22,000 | 22,000 | 09 Jun 2026 | Direct | |||
| Arun Das | CABA | Stock Option (Right to Buy) | Award | 175,000 | 175,000 | 02 Mar 2026 | Direct | |||
| Michael Gerard | CABA | Stock Option (Right to Buy) | Award | 175,000 | 175,000 | 02 Mar 2026 | Direct | |||
| Gwendolyn Binder | CABA | Stock Option (Right to Buy) | Award | 225,000 | 225,000 | 02 Mar 2026 | Direct | |||
| David J. Chang | CABA | Stock Option (Right to Buy) | Award | 225,000 | 225,000 | 02 Mar 2026 | Direct | |||
| Steven Nichtberger | CABA | Stock Option (Right to Buy) | Award | 674,000 | 674,000 | 02 Mar 2026 | Direct | |||
| Anup Marda | CABA | Stock Option (Right to Buy) | Award | 225,000 | 225,000 | 02 Mar 2026 | Direct | |||
| David J. Chang | CABA | Common Stock | Purchase | $19,888 | $2.26 | 8,800 | 8,800 | 21 Jan 2026 | Direct | |
| Gwendolyn Binder | CABA | Common Stock | Purchase | 56.6% | $24,763 | $2.19 | 11,312 | 31,312 | 21 Jan 2026 | Direct |
| Shawn Tomasello | CABA | Common Stock | Purchase | $50,322 | $2.21 | 22,725 | 22,725 | 21 Jan 2026 | By Shawn Tomasello Consulting LLC | |
| Steve Gavel | CABA | Common Stock | Purchase | $50,215 | $2.26 | 22,170 | 22,170 | 21 Jan 2026 | Direct | |
| Catherine Bollard | CABA | Common Stock | Purchase | 440.5% | $9,982 | $2.27 | 4,405 | 5,405 | 21 Jan 2026 | Direct |
| Steven Nichtberger | CABA | Common Stock | Purchase | 4.56% | $100,778 | $2.24 | 45,000 | 1,031,483 | 21 Jan 2026 | Direct |
| Mark Simon | CABA | Common Stock | Purchase | 8.12% | $25,261 | $2.28 | 11,061 | 147,205 | 21 Jan 2026 | Direct |
| Michael Gerard | CABA | Common Stock | Purchase | $14,979 | $2.27 | 6,600 | 6,600 | 21 Jan 2026 | Direct | |
| Steve Gavel | CABA | Stock Option (Right to Buy) | Award | 275,000 | 275,000 | 13 Oct 2025 | Direct |
* marks a reported price that did not pass the local price check.