Topper James N (CIK 0001341382)

Latest company ownership

Shares held
6,801,000
Last filed at
Dec 29, 2023
Confidence Score
50.0
2025Q4
Confidence Score History
2024Q1 2025Q4
MBX - MBX Biosciences, Inc.
Role: 10% Owner
Shares held
5,219,440
Last filed at
Sep 30, 2025
Confidence Score
59.4
2025Q4
Confidence Score History
2024Q3 2025Q4
Shares held
3,116,912
Last filed at
Jul 24, 2019
Confidence Score
50.0
2025Q4
Confidence Score History
2019Q3 2025Q4
Shares held
1,353,640
Last filed at
Oct 30, 2019
Confidence Score
51.6
2025Q4
Confidence Score History
2019Q4 2025Q4
Shares held
1,074,467
Last filed at
Feb 6, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q1 2025Q4
Shares held
540,498
Last filed at
May 14, 2015
Confidence Score
50.0
2025Q4
Confidence Score History
2015Q2 2025Q4
PASG - Passage BIO, Inc.
Role: 10% Owner
Shares held
432,802
Last filed at
Mar 3, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q1 2025Q4
Shares held
214,281
Last filed at
Oct 20, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2020Q4 2025Q4
ANAB - ANAPTYSBIO, INC
Role: Director
Shares held
80,812
Last filed at
Nov 18, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2017Q1 2025Q4
HLVX - HilleVax, Inc.
Role: 10% Owner
Shares held
0
Last filed at
Sep 17, 2025
Confidence Score
43.4
2025Q4
Confidence Score History
2022Q2 2025Q4

Recent buy/sell transactions

Exec date Filing date Company Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Sep 26, 2025 Sep 30, 2025 MBX Biosciences, Inc. 10% Owner Buy 100.0 +666,666 14.64% ✗ $12M
Sep 15, 2025 Sep 17, 2025 NewAmsterdam Pharma Co N.V. Director Buy 48.8 +660 0.01% ✗ $15.6K
Sep 17, 2025 Sep 17, 2025 HilleVax, Inc. 10% Owner Sell 15.0 -8,552,536 -100.00% ✗ $16.7M
Sep 8, 2025 Sep 10, 2025 NewAmsterdam Pharma Co N.V. Director Buy 48.8 +1,260 0.02% ✗ $31.5K
Aug 11, 2025 Aug 13, 2025 NewAmsterdam Pharma Co N.V. Director Buy 48.8 +471 0.01% ✗ $11.3K
Jun 24, 2025 Jun 26, 2025 NewAmsterdam Pharma Co N.V. Director Buy 60.0 +3,780 0.06% ✗ $69.5K
Jun 16, 2025 Jun 18, 2025 NewAmsterdam Pharma Co N.V. Director Buy 60.0 +8,584 0.13% ✗ $167.4K
May 21, 2025 May 23, 2025 Phathom Pharmaceuticals, Inc. Director Buy 56.3 +3,780 0.06% ✗ $14.6K
May 13, 2025 May 15, 2025 Phathom Pharmaceuticals, Inc. Director Buy 56.3 +7,420 0.13% ✗ $24.5K
May 9, 2025 May 13, 2025 Phathom Pharmaceuticals, Inc. Director Buy 72.5 +48,203 0.82% ✗ $152.9K
Mar 26, 2025 Mar 28, 2025 NewAmsterdam Pharma Co N.V. Director Buy 48.8 +1,135 0.02% ✗ $25.5K
Mar 4, 2025 Mar 6, 2025 NewAmsterdam Pharma Co N.V. Director Buy 60.0 +4,005 0.06% ✗ $84.2K
Sep 16, 2024 Sep 17, 2024 MBX Biosciences, Inc. 10% Owner Buy 100.0 +625,000 15.91% ✗ $10M
Apr 4, 2024 Apr 8, 2024 HilleVax, Inc. 10% Owner Buy 60.0 +8,850 0.10% ✗ $128.3K
Mar 26, 2024 Mar 28, 2024 NewAmsterdam Pharma Co N.V. Director Buy 60.0 +8,429 0.12% ✗ $181.2K
Oct 24, 2023 Oct 26, 2023 Arcutis Biotherapeutics, Inc. 10% Owner Buy 72.5 +80,000 0.91% ✗ $200K
Aug 5, 2022 Aug 9, 2022 Arcutis Biotherapeutics, Inc. 10% Owner Buy 93.8 +250,000 2.95% ✗ $5M
May 3, 2022 May 3, 2022 HilleVax, Inc. 10% Owner Buy 100.0 +1,764,706 26.06% ✗ $30M
Oct 20, 2020 Oct 20, 2020 Tarsus Pharmaceuticals, Inc. 10% Owner Buy 100.0 +312,500 19.47% ✗ $5M
Mar 3, 2020 Mar 3, 2020 Passage BIO, Inc. 10% Owner Buy 100.0 +550,000 12.33% ✗ $9.9M
Feb 4, 2020 Feb 6, 2020 Arcutis Biotherapeutics, Inc. 10% Owner Buy 93.8 +500,000 4.98% ✗ $8.5M
Oct 29, 2019 Oct 30, 2019 Phathom Pharmaceuticals, Inc. Director Buy 100.0 +1,052,631 16.89% ✗ $20M
Jul 22, 2019 Jul 24, 2019 Mirum Pharmaceuticals, Inc. 10% Owner Buy 100.0 +450,000 14.44% ✗ $6.8M
Jan 31, 2017 Jan 31, 2017 ANAPTYSBIO, INC Director Buy 100.0 +400,000 42.43% ✗ $6M
May 12, 2015 May 14, 2015 COLLEGIUM PHARMACEUTICAL, INC 10% Owner Buy 95.0 +150,000 8.63% ✗ $1.8M