ZBIO insider buying
Every open-market purchase of Zenas BioPharma, Inc. (ZBIO) stock by its officers, directors and major shareholders, from SEC Form 4 filings.
Bought, last 12 months$11.42M
Insiders buying (12m)4
Purchases on record16
Last purchase filedMay 18, 2026
In the last 12 months, 4 insiders of Zenas BioPharma, Inc. bought $11.42M of ZBIO stock on the open market in 10 reported purchases. The most recent was filed on May 18, 2026: Moulder Leon O Jr (Chief Executive Officer, Director) bought 60,000 shares at $16.88, worth $1.01M. The largest purchase on record here is $6.01M by Harwin Peter Evan +3 on Oct 7, 2025.
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| Filed | Insider | Value | Shares | Price | Stake | Trade | |
|---|---|---|---|---|---|---|---|
| May 18 | Moulder Leon O JrChief Executive Officer, Director | $1.01M | 60,000 | $16.88 | +162% | May 18 | SEC |
| Apr 29 | Moulder Leon O JrChief Executive Officer, Director | $1.07M | 60,000 | $17.79 | +4% | Apr 28 | SEC |
| Apr 2 | Lu HongboDirector | $70.20K | 3,768 | $18.63 | +1% | Mar 31 | SEC |
| Apr 1 | Kiselak Tomas +3Director | $3M | 150,000 | $20.00 | +7% | Mar 31 | SEC |
| Mar 31 | Moulder Leon O JrChief Executive Officer, Director | $1.02M | 54,000 | $18.91 | +3% | Mar 30 | SEC |
| Mar 31 | Lu HongboDirector | $1.50M | 75,000 | $20.00 | +22% | Mar 31 | SEC |
| Feb 13 | Lu HongboDirector | $584.66K | 25,985 | $22.50 | +8% | Feb 11 | SEC |
| Feb 13 | Allen Patricia LDirector | $499.75K | 19,860 | $25.16 | new | Feb 12 | SEC |
| Feb 3 | Moulder Leon O JrChief Executive Officer, Director | $1.02M | 57,000 | $17.96 | +16% | Feb 2 | SEC |
| Jan 9 | Moulder Leon O JrChief Executive Officer, Director | $1.64M | 100,000 | $16.39 | +41% | Jan 7 | SEC |
| Oct 14 | Nunn Jason RaleighDirector | $1.20M | 63,158 | $19.00 | +6% | Oct 9 | SEC |
| Oct 14 | Sr One Capital Management, LL…10% Owner | $2.40M | 126,315 | $19.00 | +12% | Oct 9 | SEC |
| Oct 14 | Enright Patrick GDirector | $2.25M | 117,255 | $19.19 | new | Oct 9 | SEC |
| Oct 9 | Moulder Leon O JrSee Remarks, Director | $769.95K | 36,928 | $20.85 | new | Oct 7 | SEC |
| Oct 9 | Harwin Peter Evan +3Director | $6.01M | 316,219 | $19.00 | +17% | Oct 7 | SEC |
| Oct 9 | Lu HongboDirector | $6M | 321,983 | $18.63 | new | Sep 13 | SEC |