Company · Ownership research

Definium Therapeutics, Inc. DFTX

CIK 0001813814

Form 4 transactions dated Sep 1, 2023 to Sep 25, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

Insider filings on file run through 2026-09-04.

Insider purchases & sales

Purchased: $45.07K
Sold: $6.84M

Sep 1, 2023 – Sep 4, 2026
Available records · partial months are marked ·

20269 of 9 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
2026-09-03	Barrow Robert Chief Executive Officer · Director	Sale10b5-1 footnote	$721.73K 19,023 shares sold	1.26% sold Direct holding	▾
2026-06-25	Sullivan Mark Chief Legal Officer	Sale10b5-1 footnote	$585.75K 13,008 shares sold	3.90% sold Direct holding	▾
2026-06-25	Karlin Daniel Chief Medical Officer	Sale10b5-1 footnote	$451.88K 10,035 shares sold	1.95% sold Direct holding	▾
2026-06-25	Roberts Brandi Chief Financial Officer	Sale10b5-1 footnote	$135.68K 3,013 shares sold	1.42% sold Direct holding	▾
2026-06-25	Barrow Robert Chief Executive Officer · Director	Sale10b5-1 footnote	$1.32M 29,208 shares sold	2.59% sold Direct holding	▾
2026-06-25	Wiley Matthew T. Chief Commercial Officer	Sale10b5-1 footnote	$129.10K 2,867 shares sold	1.62% sold Direct holding	▾
2026-03-25	Karlin Daniel Chief Medical Officer	Sale10b5-1 footnote	$148.09K 8,018 shares sold	1.90% sold Direct holding	▾
2026-03-25	Sullivan Mark Chief Legal Officer	Sale10b5-1 footnote	$197.67K 10,702 shares sold	3.80% sold Direct holding	▾
2026-03-25	Barrow Robert Chief Executive Officer · Director	Sale10b5-1 footnote	$451.24K 24,431 shares sold	3.14% sold Direct holding	▾

Showing 9 / 9 record groups in 2026. The complete set is available through the API.

Definium Therapeutics, Inc. · DFTX

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 9 of 9 purchase / sale groups and 29 of 29 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":"DFTX","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.