Company · Ownership research

Cabaletta Bio, Inc. CABA

CIK 0001759138

Form 4 transactions dated Sep 1, 2023 to Sep 23, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

Insider filings on file run through 2026-06-10.

Insider purchases & sales

Purchased: $296.19K
Sold: $992.38K

Sep 1, 2023 – Jun 10, 2026
Available records · partial months are marked ·

20268 of 8 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
2026-01-21	Chang David J. Chief Medical Officer	Purchase	$19.89K 8,800 shares bought	New holding Direct holding	▾
2026-01-21	Binder Gwendolyn President, Science & Tech.	Purchase	$24.76K 11,312 shares bought	56.56% added Direct holding	▾
2026-01-21	Tomasello Shawn Director	Purchase	$50.32K 22,725 shares bought	New holding LLC holding	▾
2026-01-21	Gavel Steve Chief Commercial Officer	Purchase	$50.22K 22,170 shares bought	New holding Direct holding	▾
2026-01-21	Bollard Catherine Director	Purchase	$9.98K 4,405 shares bought	440.50% added Direct holding	▾
2026-01-21	Nichtberger Steven President & CEO · Director	Purchase	$100.78K 45,000 shares bought	4.56% added Direct holding	▾
2026-01-21	Simon Mark Director	Purchase	$25.26K 11,061 shares bought	8.12% added Direct holding	▾
2026-01-21	Gerard Michael General Counsel	Purchase	$14.98K 6,600 shares bought	New holding Direct holding	▾

Showing 8 / 8 record groups in 2026. The complete set is available through the API.

Cabaletta Bio, Inc. · CABA

Follow the people behind the trades.

Sign in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and reach other datasets through the Akkru API.

Download CSV
Earlier filings
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 8 of 8 purchase / sale groups and 11 of 11 other groups; the totals and the monthly series cover the whole window.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP.

MCP  https://api.akkrudata.ai/mcp

list_insider_transactions
{"ticker":"CABA","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP documentation: /documents
llms.txt: /llms.txt

Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.