30% off. Use code SUMMERSALE30 at checkout for 30% off for 12 months on Plus, Pro and Premium subscriptions. Subscribe now
United States Biotechnology & Medical Research

Zenas Biopharma Inc (ZBIO)

Track

Over the last 90 days, Zenas Biopharma Inc. has seen significant insider buying totaling over $7.6 million, with no reported sales. The CEO, Leon O. Moulder Jr., has been a consistent buyer, acquiring shares across multiple transactions. Other executives and entities also contributed to the net buying activity, which represents a small percentage of the company's float.
Stock chart
Ticker: ZBIO Exchange: NSM
Preparing chart...
Download chart Copy chart image Copy link Share to X Share


Subscribe to get access to the transaction volume chart and in-chart transaction details
• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
MOULDER LEON O JR
Chief Executive Officer
1 purchase — total 1,012,800 USD
Buy 18 May 2026
Value US$587,583.01 | Price 152.03 | Shares 92,315
Buy 29 Apr 2026
Value US$2,544,110.97 | Price 195.06 | Shares 8,098
Buy 28 Apr 2026
Value US$450,500.00 | Price 18.02 | Shares 25,000
Buy 31 Mar 2026
Value US$70,197.84 | Price 18.63 | Shares 3,768
Buy 31 Mar 2026
Value US$1,500,000.00 | Price 20.00 | Shares 75,000
Buy 31 Mar 2026
Value US$3,000,000.00 | Price 20.00 | Shares 150,000
Buy 31 Mar 2026
Value US$656,540.00 | Price 19.31 | Shares 34,000
Buy 30 Mar 2026
Value US$364,600.00 | Price 18.23 | Shares 20,000
Buy 13 Feb 2026
Value US$109,657.60 | Price 26.36 | Shares 4,160
Buy 12 Feb 2026
Value US$132,500.00 | Price 26.50 | Shares 5,000
Buy 12 Feb 2026
Value US$138,738.00 | Price 24.34 | Shares 5,700
Buy 12 Feb 2026
Value US$118,850.00 | Price 23.77 | Shares 5,000
Buy 11 Feb 2026
Value US$584,662.50 | Price 22.50 | Shares 25,985
Buy 2 Feb 2026
Value US$1,023,720.00 | Price 17.96 | Shares 57,000
Buy 9 Jan 2026
Value US$331,000.00 | Price 16.55 | Shares 20,000
Buy 8 Jan 2026
Value US$489,000.00 | Price 16.30 | Shares 30,000
Buy 7 Jan 2026
Value US$819,000.00 | Price 16.38 | Shares 50,000
Buy 9 Oct 2025
Value US$1,199,983.00 | Price 19.00 | Shares 63,157
Buy 9 Oct 2025
Value US$1,200,002.00 | Price 19.00 | Shares 63,158
Buy 9 Oct 2025
Value US$1,200,002.00 | Price 19.00 | Shares 63,158
Buy 9 Oct 2025
Value US$249,991.50 | Price 20.85 | Shares 11,990
Buy 9 Oct 2025
Value US$2,000,035.00 | Price 19.00 | Shares 105,265
Buy 7 Oct 2025
Value US$769,948.80 | Price 20.85 | Shares 36,928
Buy 7 Oct 2025
Value US$6,008,161.00 | Price 19.00 | Shares 316,219
Buy 7 Oct 2025
Value US$5,000,040.00 | Price 19.00 | Shares 263,160
Buy 18 Feb 2025
Value US$166,750.00 | Price 6.67 | Shares 25,000
Buy 7 Feb 2025
Value US$77,600.00 | Price 7.76 | Shares 10,000
Buy 4 Dec 2024
Value US$449,100.00 | Price 9.98 | Shares 45,000
Buy 3 Dec 2024
Value US$269,000.00 | Price 10.76 | Shares 25,000
Buy 19 Nov 2024
Value US$36,425.00 | Price 14.57 | Shares 2,500
Buy 18 Nov 2024
Value US$112,500.00 | Price 15.00 | Shares 7,500
Buy 20 Sep 2024
Value US$49,948.01 | Price 18.97 | Shares 2,633
Buy 20 Sep 2024
Value US$42,321.96 | Price 17.88 | Shares 2,367
Buy 19 Sep 2024
Value US$89,450.00 | Price 17.89 | Shares 5,000
Buy 18 Sep 2024
Value US$179,100.00 | Price 17.91 | Shares 10,000
Buy 16 Sep 2024
Value US$15,000,001.00 | Price 17.00 | Shares 882,353
Buy 16 Sep 2024
Value US$5,100,000.00 | Price 17.00 | Shares 300,000
Buy 16 Sep 2024
Value US$7,499,992.00 | Price 17.00 | Shares 441,176
Buy 16 Sep 2024
Value US$23,000,014.00 | Price 17.00 | Shares 1,352,942
Buy 16 Sep 2024
Value US$7,499,992.00 | Price 17.00 | Shares 441,176
Buy 16 Sep 2024
Value US$7,499,992.00 | Price 17.00 | Shares 441,176
Buy 16 Sep 2024
Value US$7,499,992.00 | Price 17.00 | Shares 441,176
Buy 16 Sep 2024
Value US$7,480,000.00 | Price 17.00 | Shares 440,000
Buy 13 Sep 2024
Value US$999,991.00 | Price 17.00 | Shares 58,823
Buy 13 Sep 2024
Value US$999,991.00 | Price 17.00 | Shares 58,823
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
2.8
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
2.8
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
3.5
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
2.8
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
2.8
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
2.8
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
3.5
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
3.5
Lu Hongbo
Non-Executive Director
58,823 +inf%
17.00
US$999,991 		58,823 +inf% 17.00 US$999,991
Explore more

More insider trading research around Zenas Biopharma Inc

More insider trades in United States
Similar Healthcare companies with insider activity
More Pharmaceuticals & Medical Research companies with insider activity
More Biotechnology & Medical Research companies with insider activity
Insider trading in North America