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ZBIO insider trading

Zenas BioPharma, Inc. — open-market insider buys and $1M+ sells from SEC Forms 3, 4 and 5.
Insider buys · 24 mo
29
Bought · 24 mo
$118.3M
Buys · last 90 days
0 · $0
Most recent buy
2026-05-18

Cluster buy detected

5 insiders bought ZBIO within a short window (2025-10-07→2025-10-09), $12.6M in total — cluster score 89/100. Members see the buyers, the score breakdown and the chart.

See the cluster

Recent insider filings

FiledInsiderTypeSharesPriceValue
2026-05-18MOULDER LEON O JRcluster
Chief Executive Officer
Bought60,000$16.88$1.0M
2026-04-29MOULDER LEON O JRcluster
Chief Executive Officer
Bought60,000$17.79$1.1M
2026-04-02Lu Hongbocluster
Director
Bought3,768$18.63$70k
2026-04-01Fairmount Funds Management LLCcluster
Director
Bought150,000$20.00$3.0M
2026-03-31MOULDER LEON O JRcluster
Chief Executive Officer
Bought54,000$18.91$1.0M
2026-03-31Lu Hongbocluster
Director
Bought75,000$20.00$1.5M
2026-02-13Lu Hongbocluster
Director
Bought25,985$22.50$585k
2026-02-13Allen Patricia Lcluster
Director
Bought19,860$25.16$500k
2026-02-03MOULDER LEON O JRcluster
Chief Executive Officer
Bought57,000$17.96$1.0M
2026-01-09MOULDER LEON O JRcluster
Chief Executive Officer
Bought100,000$16.39$1.6M
2025-10-14Nunn Jason Raleighcluster
Director
Bought63,158$19.00$1.2M
2025-10-14George Simeoncluster
10% owner
Bought126,315$19.00$2.4M
2025-10-14ENRIGHT PATRICK Gcluster
Director
Bought117,255$19.19$2.3M
2025-10-09Lu Hongbocluster
Director
Bought321,983$18.63$6.0M
2025-10-09MOULDER LEON O JRcluster
See Remarks
Bought36,928$20.85$770k
2025-10-09Fairmount Funds Management LLCcluster
Director
Bought316,219$19.00$6.0M
2025-04-28Xiao Ting
Director
Bought10,000$7.76$78k
2025-02-19MOULDER LEON O JR
Chief Executive Officer
Bought25,000$6.67$167k
2025-02-11Xiao Ting
Director
Bought10,000$7.76$78k
2024-12-04MOULDER LEON O JR
Chief Executive Officer
Bought70,000$10.26$718k
2024-11-20MOULDER LEON O JR
Chief Executive Officer
Bought10,000$14.89$149k
2024-09-20MOULDER LEON O JRcluster
Chief Executive Officer
Bought20,000$18.04$361k
2024-09-18Enavate Sciences GP, LLCcluster
10% owner
Bought882,353$17.00$15.0M
2024-09-17Lu Hongbocluster
Director
Bought58,823$17.00$1000k
2024-09-17Fairmount Funds Management LLCcluster
Director
Bought300,000$17.00$5.1M

Showing the 25 most recent of 29 filings for ZBIO in the last two years. The full history, the price chart with every buy and sell marked, and daily updates are in the members browser.

Most active insider buyers

InsiderRoleBuysTotal bought
George Simeon10% owner2$40.4M
Fairmount Funds Management LLCDirector4$19.2M
Nunn Jason RaleighDirector2$16.2M
Enavate Sciences GP, LLC10% owner1$15.0M
ENRIGHT PATRICK GDirector2$9.7M
Lu HongboDirector5$9.2M

See ZBIO on the chart

Every insider buy and sell for ZBIO plotted on the price, the full two-year history, cluster scores and daily updates — in the members area, $29/month. A free quarterly sample of the whole dataset needs no account.

Open the browserFree sample
Data from the SEC EDGAR ownership filings, refreshed daily. Only open-market purchases (transaction code P) and sales of $1M or more are shown; grants, option exercises and tax withholding are excluded because they run on schedules set years earlier. Not investment advice.