Leon O. Moulder Jr., CEO of Zenas BioPharma, Inc. ($ZBIO), made five open market purchases of company stock over the past year, totaling about $3.4 million. His most recent buy was on February 2, 2026. These purchases rank 224th among 4,983 individual insiders in our database, surpassing the average buy of $1.5 million across 3.29 transactions per insider. Moulder reported no open market sales in the last 365 days.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 30, 2026 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 20000 | $18.23 | 2,152,122.0000 | 44,730,052 | 0.94% | 0.04% |
| March 31, 2026 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 34000 | $19.31 | 2,186,122.0000 | 44,730,052 | 1.58% | 0.08% |
| Feb. 2, 2026 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 57000 | $17.96 | 2,132,122.0000 | 42,159,340 | 2.75% | 0.14% |
| Jan. 9, 2026 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 20000 | $16.55 | 2,075,122.0000 | 42,159,340 | 0.97% | 0.05% |
| Jan. 7, 2026 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 50000 | $16.38 | 2,025,122.0000 | 42,159,340 | 2.53% | 0.12% |
| Jan. 8, 2026 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 30000 | $16.30 | 2,055,122.0000 | 42,159,340 | 1.48% | 0.07% |
| Oct. 7, 2025 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | See Remarks | P | Common Stock | 36928 | $20.85 | 1,975,122.0000 | 42,159,340 | 1.91% | 0.09% |
| June 18, 2025 | Zai Lab Ltd | $ZLAB | MOULDER LEON O JR | Not found | A | American Depositary Shares | 10831 | $0.00 | 72,602.0000 | 1,089,076,400 | 17.53% | 0.00% |
| June 10, 2025 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | See Remarks | A | Stock Option (Right to Buy) | 400000 | $0.00 | 400,000.0000 | 41,800,802 | 9999.99% | 0.96% |
| Feb. 18, 2025 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 25000 | $6.67 | 1,938,194.0000 | 13,198,960 | 1.31% | 0.19% |
| Dec. 3, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 25000 | $10.76 | 1,868,194.0000 | 7,697,695 | 1.36% | 0.32% |
| Dec. 4, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 45000 | $9.98 | 1,913,194.0000 | 7,697,695 | 2.41% | 0.58% |
| Nov. 19, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 2500 | $14.57 | 1,843,194.0000 | 7,697,695 | 0.14% | 0.03% |
| Nov. 18, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 7500 | $15.00 | 1,840,694.0000 | 7,697,695 | 0.41% | 0.10% |
| Sept. 20, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 2367 | $17.88 | 1,830,561.0000 | 1,567,269 | 0.13% | 0.15% |
| Sept. 20, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 2633 | $18.97 | 1,833,194.0000 | 1,567,269 | 0.14% | 0.17% |
| Sept. 19, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 5000 | $17.89 | 1,828,194.0000 | 1,567,269 | 0.27% | 0.32% |
| Sept. 18, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | P | Common Stock | 10000 | $17.91 | 1,823,194.0000 | 1,567,269 | 0.55% | 0.64% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Common Stock | 164523 | $0.00 | 1,441,177.0000 | 1,567,269 | 12.89% | 10.50% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Common Stock | 108381 | $0.00 | 1,764,940.0000 | 1,567,269 | 6.54% | 6.92% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Common Stock | 372017 | $0.00 | 1,813,194.0000 | 1,567,269 | 25.81% | 23.74% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Common Stock | 48254 | $0.00 | 1,813,194.0000 | 1,567,269 | 2.73% | 3.08% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Series Seed Convertible Preferred Stock | 1428571 | $0.00 | 0.0000 | 1,567,269 | 100.00% | 91.15% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Series A Convertible Preferred Stock | 941088 | $0.00 | 0.0000 | 1,567,269 | 100.00% | 60.05% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Series B Convertible Preferred Stock | 3230268 | $0.00 | 0.0000 | 1,567,269 | 100.00% | 100.00% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Series B Convertible Preferred Stock | 418996 | $0.00 | 0.0000 | 1,567,269 | 100.00% | 26.73% |
| Sept. 12, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | A | Stock Option (Right to Buy) | 1486000 | $0.00 | 1,486,000.0000 | 1,567,269 | 9999.99% | 94.82% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Series A Convertible Preferred Stock | 941088 | $0.00 | 0.0000 | 1,567,269 | 100.00% | 60.05% |
| Sept. 12, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | A | Stock Option (Right to Buy) | 1486000 | $0.00 | 1,486,000.0000 | 1,567,269 | 9999.99% | 94.82% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Common Stock | 164523 | $0.00 | 321,158.0000 | 1,567,269 | 105.04% | 10.50% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Common Stock | 108381 | $0.00 | 644,921.0000 | 1,567,269 | 20.20% | 6.92% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Common Stock | 372017 | $0.00 | 693,175.0000 | 1,567,269 | 115.84% | 23.74% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Series B Convertible Preferred Stock | 418996 | $0.00 | 0.0000 | 1,567,269 | 100.00% | 26.73% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Series B Convertible Preferred Stock | 3230268 | $0.00 | 0.0000 | 1,567,269 | 100.00% | 100.00% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Common Stock | 48254 | $0.00 | 693,175.0000 | 1,567,269 | 7.48% | 3.08% |
| Sept. 16, 2024 | Zenas BioPharma, Inc. | $ZBIO | MOULDER LEON O JR | Chief Executive Officer | C | Series Seed Convertible Preferred Stock | 1428571 | $0.00 | 0.0000 | 1,567,269 | 100.00% | 91.15% |
| June 18, 2024 | Zai Lab Ltd | $ZLAB | MOULDER LEON O JR | Not found | A | American Depositary Shares | 21253 | $0.00 | 61,771.0000 | 978,197,710 | 52.45% | 0.00% |
| May 23, 2024 | Dianthus Therapeutics, Inc. /DE/ | $DNTH | MOULDER LEON O JR | Not found | A | Stock Option (Right to Buy) | 11000 | $0.00 | 11,000.0000 | 0 | 9999.99% | 0.00% |
| Jan. 22, 2024 | Dianthus Therapeutics, Inc. /DE/ | $DNTH | MOULDER LEON O JR | Not found | A | Common Stock | 166667 | $12.00 | 1,436,745.0000 | 0 | 13.12% | 0.00% |
| June 29, 2023 | Zai Lab Ltd | $ZLAB | MOULDER LEON O JR | Not found | A | American Depositary Shares | 18903 | $26.45 | 40,518.0000 | 962,455,850 | 87.45% | 0.00% |