Zenas BioPharma (ZBIO) stock: insider trades, news & valuation
Strong buyingShare price and insider trades
Zenas BioPharma insider trading at a glance (Oct 9, 2026): in the past 12 months, 8 insiders bought $30.0M and 0 sold $0 of ZBIO stock on the open market, including a cluster buy that began Mar 30, 2026.
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ZBIO insider buying and selling by quarter
Open-market purchases (green, above the line) and sales (red, below), by trade date.
| Quarter | Bought | Purchases | Sold | Sales |
|---|---|---|---|---|
| Q4 2026 | — | 0 | — | 0 |
| Q3 2026 | — | 0 | — | 0 |
| Q2 2026 | $2.1M | 3 | — | 0 |
| Q1 2026 | $9.3M | 14 | — | 0 |
| Q4 2025 | $17.6M | 8 | — | 0 |
Valuation, profit and volume
Summary
Over the past 12 months, 8 Zenas BioPharma, Inc. insiders reported open-market purchases totaling $30.0M, while 0 insiders reported sales totaling $0. The most recent cluster buy began on Mar 30, 2026, when 3 insiders bought a combined $5.6M. Among insiders with enough purchase history to measure, Patrick G Enright (Director) has the highest Insider Score at 98.
Insider transactions
Open-market purchases and sales.
| Filed | Insider | Type | Shares | Price | Value | Since | Score |
|---|---|---|---|---|---|---|---|
| May 18SEC | Leon O Moulder Jr.CEO | Buy | 60,00096,928 held (+162%) | $16.88 | $1.0M | +61.5% | 96 |
| Apr 29SEC | Leon O Moulder Jr.CEO | Buy | 35,0001,786,039 held (+2%) | $17.62 | $617K | +54.7% | 96 |
| Apr 29SEC | Leon O Moulder Jr.CEO | Buy | 25,0001,751,039 held (+1%) | $18.02 | $450K | +51.3% | 96 |
| Apr 2SEC | Hongbo LuDirector | Buy | 3,768426,736 held (+1%) | $18.63 | $70K | +46.3% | 24 |
| Apr 1SEC | Tomas KiselakDirector | Buy | 150,0002,359,025 held (+7%) | $20.00 | $3.0M | +36.3% | — |
| Mar 31SEC | Hongbo LuDirector | Buy | 75,000422,968 held (+22%) | $20.00 | $1.5M | +36.3% | 24 |
| Mar 31SEC | Leon O Moulder Jr.CEO | Buy | 34,0001,726,039 held (+2%) | $19.31 | $657K | +41.2% | 96 |
| Mar 31SEC | Leon O Moulder Jr.CEO | Buy | 20,0001,692,039 held (+1%) | $18.23 | $365K | +49.5% | 96 |
| Feb 13SEC | Hongbo LuDirector | Buy | 25,985347,968 held (+8%) | $22.50 | $585K | +21.2% | 24 |
| Feb 13SEC | Patricia L AllenDirector | Buy | 5,70010,700 held (+114%) | $24.34 | $139K | +12.0% | — |
| Feb 13SEC | Patricia L AllenDirector | Buy | 5,00015,700 held (+47%) | $26.50 | $132K | +2.9% | — |
| Feb 13SEC | Patricia L AllenDirector | Buy | 5,000new position | $23.77 | $119K | +14.7% | — |
| Feb 13SEC | Patricia L AllenDirector | Buy | 4,16019,860 held (+26%) | $26.36 | $110K | +3.4% | — |
| Feb 3SEC | Leon O Moulder Jr.CEO | Buy | 57,000423,155 held (+16%) | $17.96 | $1.0M | +51.8% | 96 |
| Jan 9SEC | Leon O Moulder Jr.CEO | Buy | 50,000316,155 held (+19%) | $16.38 | $819K | +66.4% | 96 |
| Jan 9SEC | Leon O Moulder Jr.CEO | Buy | 30,000346,155 held (+9%) | $16.30 | $489K | +67.2% | 96 |
| Jan 9SEC | Leon O Moulder Jr.CEO | Buy | 20,000366,155 held (+6%) | $16.55 | $331K | +64.7% | 96 |
| Oct 14SEC | Patrick G EnrightDirector | Buy | 105,2651,832,669 held (+6%) | $19.00 | $2.0M | +43.5% | 98 |
| Oct 14SEC | Jason Raleigh NunnDirector | Buy | 63,1581,173,395 held (+6%) | $19.00 | $1.2M | +43.5% | — |
| Oct 14SEC | Sr One Capital Management, Llc10% Owner | Buy | 63,1581,173,395 held (+6%) | $19.00 | $1.2M | +43.5% | — |
| Oct 14SEC | Sr One Capital Management, Llc10% Owner | Buy | 63,1571,917,895 held (+3%) | $19.00 | $1.2M | +43.5% | — |
| Oct 14SEC | Patrick G EnrightDirector | Buy | 11,990new position | $20.85 | $250K | +30.7% | 98 |
| Oct 9SEC | Peter Evan HarwinDirector | Buy | 316,2192,209,025 held (+17%) | $19.00 | $6.0M | +43.5% | 15 |
| Oct 9SEC | Hongbo LuDirector | Buy | 263,160321,983 held (+447%) | $19.00 | $5.0M | +43.5% | 24 |
| Oct 9SEC | Hongbo LuDirector | Buy | 58,823new position | $17.00 | $1000K | +60.4% | 24 |
| Oct 9SEC | Leon O Moulder Jr.See Remarks | Buy | 36,928new position | $20.85 | $770K | +30.7% | 96 |
Insiders at Zenas BioPharma, Inc.
| Insider | Bought | Sold | Last filing | Score |
|---|---|---|---|---|
| Hongbo LuDirector | $8.2M | — | Apr 2, 2026 | 24 |
| Leon O Moulder Jr.CEO | $6.5M | — | May 18, 2026 | 96 |
| Peter Evan HarwinDirector | $6.0M | — | Oct 9, 2025 | 15 |
| Tomas KiselakDirector | $3.0M | — | Apr 1, 2026 | — |
| Sr One Capital Management, Llc10% Owner | $2.4M | — | Oct 14, 2025 | — |
| Patrick G EnrightDirector | $2.3M | — | Oct 14, 2025 | 98 |
| Jason Raleigh NunnDirector | $1.2M | — | Oct 14, 2025 | — |
| Patricia L AllenDirector | $500K | — | Feb 13, 2026 | — |
ZBIO stock: common questions
Are Zenas BioPharma, Inc. insiders buying ZBIO stock?
In the past 12 months, 8 insiders reported open-market purchases of ZBIO worth $30.0M. The latest was CEO Leon O Moulder Jr. bought $1.0M of ZBIO at $16.88 — raises the stake by 162%.
Are Zenas BioPharma, Inc. insiders selling ZBIO stock?
0 insiders reported sales worth $0 over the same period.
Where does this data come from?
Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.
What is ZBIO's 52-week range?
Over the past year ZBIO has traded between $15.20 and $43.17. It last closed at $27.26 on Oct 9, 2026.