Cabaletta Bio's three largest insider shareholders as of August 29, 2026 are Steven Nichtberger (President Ceo, 1.03Mn shares), Steven Nichtberger (President Ceo, 1.03Mn shares), Ventures V, L.P. 5Am (TenPercentOwner, 333.14K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Steven Nichtberger | President Ceo | 1,031,483 | 0 | 1,031,483 | 63.0% | 21 Jan, 2026 |
| 2 | Ventures V, L.P. 5Am | TenPercentOwner | 0 | 333,144 | 333,144 | 20.4% | 03 Nov, 2021 |
| 3 | Mark Simon | Director | 147,205 | 0 | 147,205 | 9.0% | 21 Jan, 2026 |
| 4 | Anup Marda | Chief Financial Officer | 50,000 | 0 | 50,000 | 3.1% | 18 Oct, 2022 |
| 5 | Gwendolyn Binder | President, Science Tech. | 31,312 | 0 | 31,312 | 1.9% | 21 Jan, 2026 |
| 6 | Steve Gavel | Chief Commercial Officer | 22,170 | 0 | 22,170 | 1.4% | 21 Jan, 2026 |
| 7 | David J. Chang | Chief Medical Officer | 8,800 | 0 | 8,800 | 0.5% | 21 Jan, 2026 |
| 8 | Michael Gerard | General Counsel | 6,600 | 0 | 6,600 | 0.4% | 21 Jan, 2026 |
| 9 | Catherine Bollard | Director | 5,405 | 0 | 5,405 | 0.3% | 21 Jan, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 09 Jun, 2026 | Scott C. Brun | Director | Acquired A | 22,000 | $0.00 | $0 | 22,000 | Direct |
| 09 Jun, 2026 | Mark Simon | Director | Acquired A | 22,000 | $0.00 | $0 | 22,000 | Direct |
| 09 Jun, 2026 | Catherine Bollard | Director | Acquired A | 22,000 | $0.00 | $0 | 22,000 | Direct |
| 09 Jun, 2026 | Richard C Jr Henriques | Director | Acquired A | 22,000 | $0.00 | $0 | 22,000 | Direct |
| 02 Mar, 2026 | David J. Chang | Chief Medical Officer | Acquired A | 225,000 | $0.00 | $0 | 225,000 | Direct |
| 02 Mar, 2026 | Gwendolyn Binder | President, Science Tech. | Acquired A | 225,000 | $0.00 | $0 | 225,000 | Direct |
| 02 Mar, 2026 | Steven Nichtberger | President Ceo | Acquired A | 674,000 | $0.00 | $0 | 674,000 | Direct |
| 02 Mar, 2026 | Arun Das | Chief Business Officer | Acquired A | 175,000 | $0.00 | $0 | 175,000 | Direct |
| 02 Mar, 2026 | Anup Marda | Chief Financial Officer | Acquired A | 225,000 | $0.00 | $0 | 225,000 | Direct |
| 02 Mar, 2026 | Michael Gerard | General Counsel | Acquired A | 175,000 | $0.00 | $0 | 175,000 | Direct |
| 02 Mar, 2026 | David J. Chang | Chief Medical Officer | Acquired A | 225,000 | $0.00 | $0 | 225,000 | Direct |
| 02 Mar, 2026 | Anup Marda | Chief Financial Officer | Acquired A | 225,000 | $0.00 | $0 | 225,000 | Direct |
| 02 Mar, 2026 | Michael Gerard | General Counsel | Acquired A | 175,000 | $0.00 | $0 | 175,000 | Direct |
| 02 Mar, 2026 | David J. Chang | Chief Medical Officer | Acquired A | 225,000 | $0.00 | $0 | 225,000 | Direct |
| 02 Mar, 2026 | Steven Nichtberger | President Ceo | Acquired A | 674,000 | $0.00 | $0 | 674,000 | Direct |
| 02 Mar, 2026 | Michael Gerard | General Counsel | Acquired A | 175,000 | $0.00 | $0 | 175,000 | Direct |
| 02 Mar, 2026 | Anup Marda | Chief Financial Officer | Acquired A | 225,000 | $0.00 | $0 | 225,000 | Direct |
| 02 Mar, 2026 | Arun Das | Chief Business Officer | Acquired A | 175,000 | $0.00 | $0 | 175,000 | Direct |
| 02 Mar, 2026 | Arun Das | Chief Business Officer | Acquired A | 175,000 | $0.00 | $0 | 175,000 | Direct |
| 02 Mar, 2026 | Arun Das | Chief Business Officer | Acquired A | 175,000 | $0.00 | $0 | 175,000 | Direct |