United States Biotechnology & Medical Research

Zenas Biopharma Inc (ZBIO)

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Zenas Biopharma Inc. experienced multiple insider buying activities between January and May 2026. Chief Executive Officer Leon O. Moulder Jr. and other key stakeholders consistently acquired shares during this period. The most recent transaction occurred on May 18, 2026. No further trading activity has been recorded by company insiders within the last three months.
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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Top insiders
Trades
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
3.9
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
152.03
Quantity 92,315 +7.5%
Value US$587,583
3.9
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
3.9
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
14.58
Quantity 54,748 +7.9%
Value US$3,067,292
3.6
Lu Hongbo Non-Executive Director
Transaction date
Purchase
Price
18.63
Quantity 3,768 +0.9%
Value US$70,198
3.9
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
3.9
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
3.9
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
3.9
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
16.55
Quantity 20,000 +5.8%
Value US$331,000
3.9
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
16.30
Quantity 30,000 +9.5%
Value US$489,000
3.9
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
3.9
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
3.9
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
3.9
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
9.98
Quantity 45,000 +22.9%
Value US$449,100
3.9
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
10.76
Quantity 25,000 +14.6%
Value US$269,000
3.9
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
14.57
Quantity 2,500 +1.5%
Value US$36,425
3.9
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
15.00
Quantity 7,500 +4.7%
Value US$112,500
3.9
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
18.97
Quantity 2,633 +0.2%
Value US$49,948
3.9
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
17.88
Quantity 2,367 +0.1%
Value US$42,322
3.9
MOULDER LEON O JR Chief Executive Officer Executive Director
Transaction date
Purchase
Price
17.89
Quantity 5,000 +0.3%
Value US$89,450
3.9
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
2026-05-18 2026-05-18 B Purchase
3.9
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
3.9
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
3.9
MOULDER LEON O JR

Chief Executive Officer

Executive Director
54,748 +7.9%
14.58
US$3,067,292 		54,748 +7.9% 14.58 US$3,067,292
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
3.9
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
3.9
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
3.9
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
3.9
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
3.9
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
3.9
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
2.9
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
2.9
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
3.9
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
3.9
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
3.9
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
3.9
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
3.9
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
3.9
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
3.9
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
3.9
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
3.9
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
3.9
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
2.9
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
2.9
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
2.9
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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