ZBIO Insider Buying — Recent SEC Form 4 Activity
Track insider buying activity for Zenas BioPharma, Inc. ($ZBIO). See every SEC Form 4 purchase by CEOs, CFOs, directors, and 10% owners over the last 90 days — sourced directly from EDGAR.
In the past 90 days, 4 insiders at Zenas BioPharma, Inc. (ZBIO) made open-market purchases totaling $6,675,745.94. The most recent transaction was on 2026-04-02.
Recent Insider Purchases at Zenas BioPharma, Inc.
| Date | Insider | Shares | Value |
|---|---|---|---|
| 2026-04-02 | Lu Hongbo | 3,768 | $70,197.84 |
| 2026-04-01 | Fairmount Funds Management LLC | 150,000 | $3,000,000.00 |
| 2026-04-01 | MOULDER LEON O JR | 34,000 | $656,540.00 |
| 2026-04-01 | MOULDER LEON O JR | 20,000 | $364,600.00 |
| 2026-03-31 | Lu Hongbo | 75,000 | $1,500,000.00 |
| 2026-02-13 | Lu Hongbo | 25,985 | $584,662.50 |
| 2026-02-13 | Allen Patricia L | 5,000 | $118,850.00 |
| 2026-02-13 | Allen Patricia L | 5,000 | $132,500.00 |
| 2026-02-13 | Allen Patricia L | 5,700 | $138,738.00 |
| 2026-02-13 | Allen Patricia L | 4,160 | $109,657.60 |
Top Insiders Buying ZBIO
- $3,000,000.001 purchase
- $2,154,860.343 purchases
- $1,021,140.002 purchases
- $499,745.604 purchases
Frequently Asked — ZBIO Insider Buying
What is ZBIO insider buying?
$ZBIO insider buying refers to open-market purchases of Zenas BioPharma, Inc. stock by corporate insiders — officers, directors, and shareholders owning more than 10% of the company. Every purchase is disclosed to the SEC on Form 4 within two business days and is shown on this page.
Why does ZBIO insider activity matter?
Insiders have the best view into Zenas BioPharma, Inc.'s operations. When they buy their own stock with personal money — rather than selling option grants — it signals conviction. Clusters of insider buying (two or more insiders purchasing within 14 days) have historically preceded above-market returns.
Where does this ZBIO insider data come from?
Every transaction on this page is sourced directly from SEC EDGAR Form 4 filings. InsiderAct ingests these filings in near real time and filters for open-market purchases (transaction code P).
How do I get alerts when ZBIO insiders buy?
Add $ZBIO to your InsiderAct watchlist and enable email alerts. You'll be notified when a new Form 4 purchase is filed — usually within hours of the transaction.
What is a "cluster buy" signal?
InsiderAct flags a cluster buy when two or more independent insiders at the same company buy on the open market within a 14-day window. Cluster buys are the highest-conviction insider signal we track.
Related Insider Activity
Other stocks with recent insider buying on SEC Form 4
Want alerts when ZBIO insiders buy?
Add $ZBIO to your watchlist and get notified the moment a new Form 4 is filed.
Data sourced from SEC Form 4 filings via EDGAR. Read more: What is SEC Form 4?