Zenas BioPharma (ZBIO) insider buying
16 open-market purchases of ZBIO by Zenas BioPharma's executives and directors since October 2025, worth $24M in total, from SEC Form 4 filings.
The most recent: Fairmount Funds Management Llc, Director bought $3M on March 31, 2026.
The biggest buyer over the period is Fairmount Funds Management Llc (Director): 2 purchases, $9M.
By year
| Year | Purchases | Value |
|---|---|---|
| 2026 | 9 | $7M |
| 2025 | 7 | $18M |
Biggest buyers
| Insider | Buys | Value |
|---|---|---|
| Fairmount Funds Management Llc Director | 2 | $9M |
| Hongbo Lu Director | 3 | $6M |
| Leon O Moulder Jr | 5 | $3M |
| Sr One Capital Management, Llc | 1 | $2M |
| Patrick G Enright | 2 | $2M |
| Jason Raleigh Nunn | 1 | $1M |
| Patricia L Allen | 2 | $499,803 |
Every purchase
Newest first. From SEC Form 4 filings. Insider buying across the market.
| Date | Insider | Shares | Price | Value | Filing |
|---|---|---|---|---|---|
| Mar 31, 2026 | Fairmount Funds Management Llc Director |
150,000 | $20.00 | $3M | Form 4 |
| Mar 31, 2026 | Hongbo Lu Director |
3,768 | $18.63 | $70,198 | Form 4 |
| Feb 13, 2026 | Patricia L Allen |
4,160 | $26.36 | $109,658 | Form 4 |
| Feb 12, 2026 | Patricia L Allen |
15,700 | $24.85 | $390,145 | Form 4 |
| Feb 11, 2026 | Hongbo Lu |
25,985 | $22.50 | $584,662 | Form 4 |
| Feb 2, 2026 | Leon O Moulder Jr |
57,000 | $17.96 | $1M | Form 4 |
| Jan 9, 2026 | Leon O Moulder Jr |
20,000 | $16.55 | $331,000 | Form 4 |
| Jan 8, 2026 | Leon O Moulder Jr |
30,000 | $16.30 | $489,000 | Form 4 |
| Jan 7, 2026 | Leon O Moulder Jr |
50,000 | $16.38 | $819,000 | Form 4 |
| Oct 9, 2025 | Jason Raleigh Nunn |
63,158 | $19.00 | $1M | Form 4 |
| Oct 9, 2025 | Patrick G Enright |
11,990 | $20.85 | $249,992 | Form 4 |
| Oct 9, 2025 | Patrick G Enright |
105,265 | $19.00 | $2M | Form 4 |
| Oct 9, 2025 | Sr One Capital Management, Llc |
126,315 | $19.00 | $2M | Form 4 |
| Oct 7, 2025 | Fairmount Funds Management Llc |
316,219 | $19.00 | $6M | Form 4 |
| Oct 7, 2025 | Hongbo Lu |
263,160 | $19.00 | $5M | Form 4 |
| Oct 7, 2025 | Leon O Moulder Jr |
36,928 | $20.85 | $769,949 | Form 4 |
Questions
Are Zenas BioPharma insiders buying the stock?
16 open-market purchases of ZBIO by Zenas BioPharma's executives and directors since October 2025, worth $24M in total, from SEC Form 4 filings. The most recent: Fairmount Funds Management Llc, Director bought $3M on March 31, 2026.
What counts as insider buying here?
Open-market purchases (Form 4 code P) by officers and directors. Option exercises, grants and purchases by 10% owners are left out.
From Zenas BioPharma's annual reports filed with the SEC (XBRL data), standardised by Investingly. Information only, not investment advice.