United States Biotechnology & Medical Research

Zenas BioPharma, Inc. (ZBIO)

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Zenas BioPharma recently recorded a significant proposed sale of 1,000,000 shares valued at $31.91 million by affiliate Zebra Aggregator, LP. This follows a period of consistent buying activity from executives and other insiders earlier this year. The stock price has risen 7% over the last quarter despite a substantial miss in the latest earnings report.
Ticker: ZBIO Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Insider trades have triggered activity signals for Zenas BioPharma, Inc.. Upgrade to see score, net flow, insiders and the full signal context.

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Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Zebra Aggregator, LP Affiliate
Transaction date
Proposed sale
Price
132.04
Quantity 89,420
Value US$3,998,685
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
152.03
Quantity 92,315 +7.5%
Value US$587,583
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
195.06
Quantity 8,098 -0.4%
Value US$2,544,111
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
18.02
Quantity 25,000 +1.4%
Value US$450,500
3.6
Lu Hongbo Non-Executive Director
Transaction date
Purchase
Price
18.63
Quantity 3,768 +0.9%
Value US$70,198
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
19.31
Quantity 34,000 +2.0%
Value US$656,540
3.6
Lu Hongbo Non-Executive Director
Transaction date
Purchase
Price
20.00
Quantity 75,000 +21.6%
Value US$1,500,000
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
18.23
Quantity 20,000 +1.2%
Value US$364,600
2.6
Allen Patricia L Non-Executive Director
Transaction date
Purchase
Price
26.36
Quantity 4,160 +26.5%
Value US$109,658
2.6
Allen Patricia L Non-Executive Director
Transaction date
Purchase
Price
26.50
Quantity 5,000 +46.7%
Value US$132,500
2.6
Allen Patricia L Non-Executive Director
Transaction date
Purchase
Price
24.34
Quantity 5,700 +114.0%
Value US$138,738
2.6
Allen Patricia L Non-Executive Director
Transaction date
Purchase
Price
23.77
Quantity 5,000 +inf%
Value US$118,850
3.6
Lu Hongbo Non-Executive Director
Transaction date
Purchase
Price
22.50
Quantity 25,985 +8.1%
Value US$584,662
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
17.96
Quantity 57,000 +15.6%
Value US$1,023,720
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
16.55
Quantity 20,000 +5.8%
Value US$331,000
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
16.30
Quantity 30,000 +9.5%
Value US$489,000
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
16.38
Quantity 50,000 +18.8%
Value US$819,000
1.4
Nunn Jason Raleigh Non-Executive Director
Transaction date
Purchase
Price
19.00
Quantity 63,158 +5.7%
Value US$1,200,002
3.6
ENRIGHT PATRICK G Non-Executive Director
Transaction date
Purchase
Price
20.85
Quantity 11,990 +inf%
Value US$249,992
3.6
ENRIGHT PATRICK G Non-Executive Director
Transaction date
Purchase
Price
19.00
Quantity 105,265 +6.1%
Value US$2,000,035
4.1
MOULDER LEON O JR See Remarks Executive Director
Transaction date
Purchase
Price
20.85
Quantity 36,928 +inf%
Value US$769,949
3.6
Lu Hongbo Non-Executive Director
Transaction date
Purchase
Price
19.00
Quantity 263,160 +447.4%
Value US$5,000,040
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
6.67
Quantity 25,000 +10.4%
Value US$166,750
2.4
Xiao Ting Non-Executive Director
Transaction date
Purchase
Price
7.76
Quantity 10,000 +27.0%
Value US$77,600
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
9.98
Quantity 45,000 +22.9%
Value US$449,100
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
10.76
Quantity 25,000 +14.6%
Value US$269,000
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
14.57
Quantity 2,500 +1.5%
Value US$36,425
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
15.00
Quantity 7,500 +4.7%
Value US$112,500
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
18.97
Quantity 2,633 +0.2%
Value US$49,948
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
17.88
Quantity 2,367 +0.1%
Value US$42,322
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
17.89
Quantity 5,000 +0.3%
Value US$89,450
4.1
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
17.91
Quantity 10,000 +0.6%
Value US$179,100
1.4
Enavate Sciences GP, LLC Large shareholder
Transaction date
Purchase
Price
17.00
Quantity 882,353 +30.6%
Value US$15,000,001
1.4
Nunn Jason Raleigh Non-Executive Director
Transaction date
Purchase
Price
17.00
Quantity 441,176 +65.9%
Value US$7,499,992
1.4
Nunn Jason Raleigh Non-Executive Director
Transaction date
Purchase
Price
17.00
Quantity 441,176 +29.3%
Value US$7,499,992
3.6
ENRIGHT PATRICK G Non-Executive Director
Transaction date
Purchase
Price
17.00
Quantity 440,000 +131.5%
Value US$7,480,000
3.6
Lu Hongbo Non-Executive Director
Transaction date
Purchase
Price
17.00
Quantity 58,823 +inf%
Value US$999,991
3.6
Lu Hongbo Non-Executive Director
Transaction date
Purchase
Price
17.00
Quantity 58,823 +inf%
Value US$999,991
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-08-19 2026-08-19 PrS Proposed sale
Zebra Aggregator, LP

Affiliate
89,420
132.04
US$3,998,685 		89,420 132.04 US$3,998,685
2026-05-18 2026-05-18 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
92,315 +7.5%
152.03
US$587,583 		92,315 +7.5% 152.03 US$587,583
2026-04-29 2026-04-29 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
8,098 -0.4%
195.06
US$2,544,111 		8,098 -0.4% 195.06 US$2,544,111
2026-04-29 2026-04-28 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
25,000 +1.4%
18.02
US$450,500 		25,000 +1.4% 18.02 US$450,500
2026-04-02 2026-03-31 B Purchase
3.6
Lu Hongbo
Non-Executive Director
3,768 +0.9%
18.63
US$70,198 		3,768 +0.9% 18.63 US$70,198
2026-04-01 2026-03-31 B Purchase
3.3
Fairmount Funds Management LLC
Non-Executive Director
150,000 +6.8%
20.00
US$3,000,000 		150,000 +6.8% 20.00 US$3,000,000
2026-03-31 2026-03-31 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
34,000 +2.0%
19.31
US$656,540 		34,000 +2.0% 19.31 US$656,540
2026-03-31 2026-03-31 B Purchase
3.6
Lu Hongbo
Non-Executive Director
75,000 +21.6%
20.00
US$1,500,000 		75,000 +21.6% 20.00 US$1,500,000
2026-03-31 2026-03-30 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
20,000 +1.2%
18.23
US$364,600 		20,000 +1.2% 18.23 US$364,600
2026-02-13 2026-02-13 B Purchase
2.6
Allen Patricia L
Non-Executive Director
4,160 +26.5%
26.36
US$109,658 		4,160 +26.5% 26.36 US$109,658
2026-02-13 2026-02-12 B Purchase
2.6
Allen Patricia L
Non-Executive Director
5,000 +46.7%
26.50
US$132,500 		5,000 +46.7% 26.50 US$132,500
2026-02-13 2026-02-12 B Purchase
2.6
Allen Patricia L
Non-Executive Director
5,700 +114.0%
24.34
US$138,738 		5,700 +114.0% 24.34 US$138,738
2026-02-13 2026-02-12 B Purchase
2.6
Allen Patricia L
Non-Executive Director
5,000 +inf%
23.77
US$118,850 		5,000 +inf% 23.77 US$118,850
2026-02-13 2026-02-11 B Purchase
3.6
Lu Hongbo
Non-Executive Director
25,985 +8.1%
22.50
US$584,662 		25,985 +8.1% 22.50 US$584,662
2026-02-03 2026-02-02 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
57,000 +15.6%
17.96
US$1,023,720 		57,000 +15.6% 17.96 US$1,023,720
2026-01-09 2026-01-09 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
20,000 +5.8%
16.55
US$331,000 		20,000 +5.8% 16.55 US$331,000
2026-01-09 2026-01-08 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
30,000 +9.5%
16.30
US$489,000 		30,000 +9.5% 16.30 US$489,000
2026-01-09 2026-01-07 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
50,000 +18.8%
16.38
US$819,000 		50,000 +18.8% 16.38 US$819,000
2025-10-14 2025-10-09 B Purchase
3.0
SR ONE CAPITAL MANAGEMENT, LLC
Large shareholder
63,157 +3.4%
19.00
US$1,199,983 		63,157 +3.4% 19.00 US$1,199,983
2025-10-14 2025-10-09 B Purchase
3.0
SR ONE CAPITAL MANAGEMENT, LLC
Large shareholder
63,158 +5.7%
19.00
US$1,200,002 		63,158 +5.7% 19.00 US$1,200,002
2025-10-14 2025-10-09 B Purchase
1.4
Nunn Jason Raleigh
Non-Executive Director
63,158 +5.7%
19.00
US$1,200,002 		63,158 +5.7% 19.00 US$1,200,002
2025-10-14 2025-10-09 B Purchase
3.6
ENRIGHT PATRICK G
Non-Executive Director
11,990 +inf%
20.85
US$249,992 		11,990 +inf% 20.85 US$249,992
2025-10-14 2025-10-09 B Purchase
3.6
ENRIGHT PATRICK G
Non-Executive Director
105,265 +6.1%
19.00
US$2,000,035 		105,265 +6.1% 19.00 US$2,000,035
2025-10-09 2025-10-07 B Purchase
4.1
MOULDER LEON O JR

See Remarks

Executive Director
36,928 +inf%
20.85
US$769,949 		36,928 +inf% 20.85 US$769,949
2025-10-09 2025-10-07 B Purchase
3.3
Fairmount Funds Management LLC
Non-Executive Director
316,219 +16.7%
19.00
US$6,008,161 		316,219 +16.7% 19.00 US$6,008,161
2025-10-09 2025-10-07 B Purchase
3.6
Lu Hongbo
Non-Executive Director
263,160 +447.4%
19.00
US$5,000,040 		263,160 +447.4% 19.00 US$5,000,040
2025-02-19 2025-02-18 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
25,000 +10.4%
6.67
US$166,750 		25,000 +10.4% 6.67 US$166,750
2025-02-11 2025-02-07 B Purchase
2.4
Xiao Ting
Non-Executive Director
10,000 +27.0%
7.76
US$77,600 		10,000 +27.0% 7.76 US$77,600
2024-12-04 2024-12-04 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
45,000 +22.9%
9.98
US$449,100 		45,000 +22.9% 9.98 US$449,100
2024-12-04 2024-12-03 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
25,000 +14.6%
10.76
US$269,000 		25,000 +14.6% 10.76 US$269,000
2024-11-20 2024-11-19 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
2,500 +1.5%
14.57
US$36,425 		2,500 +1.5% 14.57 US$36,425
2024-11-20 2024-11-18 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
7,500 +4.7%
15.00
US$112,500 		7,500 +4.7% 15.00 US$112,500
2024-09-20 2024-09-20 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
2,633 +0.2%
18.97
US$49,948 		2,633 +0.2% 18.97 US$49,948
2024-09-20 2024-09-20 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
2,367 +0.1%
17.88
US$42,322 		2,367 +0.1% 17.88 US$42,322
2024-09-20 2024-09-19 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
5,000 +0.3%
17.89
US$89,450 		5,000 +0.3% 17.89 US$89,450
2024-09-20 2024-09-18 B Purchase
4.1
MOULDER LEON O JR

Chief Executive Officer

Executive Director
10,000 +0.6%
17.91
US$179,100 		10,000 +0.6% 17.91 US$179,100
2024-09-18 2024-09-16 B Purchase
1.4
Enavate Sciences GP, LLC
Large shareholder
882,353 +30.6%
17.00
US$15,000,001 		882,353 +30.6% 17.00 US$15,000,001
2024-09-16 2024-09-16 B Purchase
3.3
Fairmount Funds Management LLC
Non-Executive Director
300,000 +23.0%
17.00
US$5,100,000 		300,000 +23.0% 17.00 US$5,100,000
2024-09-16 2024-09-16 B Purchase
3.0
SR ONE CAPITAL MANAGEMENT, LLC
Large shareholder
441,176 +65.9%
17.00
US$7,499,992 		441,176 +65.9% 17.00 US$7,499,992
2024-09-16 2024-09-16 B Purchase
3.0
SR ONE CAPITAL MANAGEMENT, LLC
Large shareholder
1,352,942 +269.6%
17.00
US$23,000,014 		1,352,942 +269.6% 17.00 US$23,000,014
2024-09-16 2024-09-16 B Purchase
3.0
SR ONE CAPITAL MANAGEMENT, LLC
Large shareholder
441,176 +29.3%
17.00
US$7,499,992 		441,176 +29.3% 17.00 US$7,499,992
2024-09-16 2024-09-16 B Purchase
1.4
Nunn Jason Raleigh
Non-Executive Director
441,176 +65.9%
17.00
US$7,499,992 		441,176 +65.9% 17.00 US$7,499,992
2024-09-16 2024-09-16 B Purchase
1.4
Nunn Jason Raleigh
Non-Executive Director
441,176 +29.3%
17.00
US$7,499,992 		441,176 +29.3% 17.00 US$7,499,992
2024-09-16 2024-09-16 B Purchase
3.6
ENRIGHT PATRICK G
Non-Executive Director
440,000 +131.5%
17.00
US$7,480,000 		440,000 +131.5% 17.00 US$7,480,000
2025-10-09 2024-09-13 B Purchase
3.6
Lu Hongbo
Non-Executive Director
58,823 +inf%
17.00
US$999,991 		58,823 +inf% 17.00 US$999,991
2024-09-17 2024-09-13 B Purchase
3.6
Lu Hongbo
Non-Executive Director
58,823 +inf%
17.00
US$999,991 		58,823 +inf% 17.00 US$999,991
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