Zenas BioPharma, Inc. ZBIO
CIK 0001953926
Form 4 transactions dated Sep 1, 2023 to Sep 25, 2026, as reported to the SEC.
Insider purchases & sales
- Purchased
- $113.10M
- Sold
- $0.00
Sep 1, 2023 – Sep 2, 2026
Available records · partial months are marked ·
| Date | Insider | Activity | Trade value (USD) | % of prior holding | |
|---|---|---|---|---|---|
| 2025-10-09 | Nunn Jason Raleigh Director | Purchase | $1.20M 63,158 shares bought | 5.69% added Indirect holding | ▾ |
| 2025-10-09 | George Simeon · SR ONE CAPITAL MANAGEMENT, LLC 10% owner | Purchase | $1.20M 63,158 shares bought | Unavailable Indirect holding | ▾ |
| 2025-10-09 | George Simeon · SR ONE CAPITAL MANAGEMENT, LLC 10% owner | Purchase | $1.20M 63,157 shares bought | Unavailable Indirect holding | ▾ |
| 2025-10-09 | ENRIGHT PATRICK G Director | Purchase | $2.00M 105,265 shares bought | 6.09% added Indirect holding | ▾ |
| 2025-10-09 | ENRIGHT PATRICK G Director | Purchase | $249.99K 11,990 shares bought | New holding Direct holding | ▾ |
| 2025-10-07 | MOULDER LEON O JR See Remarks · Director | Purchase | $769.95K 36,928 shares bought | New holding Indirect holding | ▾ |
| 2025-10-07 | Harwin Peter Evan · Fairmount Healthcare Fund II L.P. · Fairmount Funds Management LLC · Kiselak Tomas Director | Purchase | $6.01M 316,219 shares bought | Unavailable Indirect holding | ▾ |
| 2025-10-07 | Lu Hongbo Director | Purchase | $5.00M 263,160 shares bought | 447.38% added Indirect holding | ▾ |
| 2025-02-18 | MOULDER LEON O JR Chief Executive Officer · Director | Purchase | $166.75K 25,000 shares bought | 10.37% added Direct holding | ▾ |
| 2025-02-07 | Xiao Ting Director | Purchase | $77.60K 10,000 shares bought | New holding Direct holding | ▾ |
Showing 10 / 10 record groups in 2025. The complete set is available through the API.
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
＋ 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 10 of 10 purchase / sale groups and 12 of 12 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":"ZBIO","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.