- Corporate Officers - T
- Topper James N
Insider Trading History of Topper James N
The following table details the insider trading activities
(stock purchases, stock sales, and stock option exercises) of Topper James N since 2015.
This trader's CIK number is 1341382.
At the time of last reporting, Topper James N was the Officer of Newamsterdam Pharma Co N.v.. (stock ticker symbol NAMS).
Also see all insider trading activities at Newamsterdam Pharma Co N.v..
Note that in the past
Topper James N also reported insider trading activities as an insider of the following companies:
Yearly summary of insider trading at Allena Pharmaceuticals, Inc. (ALNA) by Topper James N
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2017 | ALNA | 500,000 | $7,000,000 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Phathom Pharmaceuticals, Inc. (PHAT) by Topper James N
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2025 | PHAT | 51,983 | $174,140 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Sierra Oncology, Inc. (SRRA) by Topper James N
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2017 | SRRA | 5,925,926 | $8,000,000 | 0 | $0 | 0 | $0 |
| 2015 | SRRA | 220,000 | $3,740,000 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Mbx Biosciences, Inc. (MBX) by Topper James N
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2024 | MBX | 625,000 | $10,000,000 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Newamsterdam Pharma Co N.v. (NAMS) by Topper James N
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2025 | NAMS | 17,975 | $357,862 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Passage Bio, Inc. (PASG) by Topper James N
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2020 | PASG | 550,000 | $9,900,000 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Aptinyx Inc. (APTX) by Topper James N
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2018 | APTX | 150,000 | $2,400,000 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Arcutis Biotherapeutics, Inc. (ARQT) by Topper James N
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2020 | ARQT | 500,000 | $8,500,000 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Anaptysbio, Inc (ANAB) by Topper James N
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2017 | ANAB | 400,000 | $6,000,000 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Alpine Immune Sciences, Inc. (ALPN) by Topper James N
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2024 | ALPN | 0 | $0 | 19 | $1,226 | 0 | $0 |
| 2022 | ALPN | 112,665 | $800,034 | 0 | $0 | 0 | $0 |
| 2019 | ALPN | 372,439 | $1,999,997 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Entasis Therapeutics Holdings Inc. (ETTX) by Topper James N
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2018 | ETTX | 375,887 | $5,638,305 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Mirum Pharmaceuticals, Inc. (MIRM) by Topper James N
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2019 | MIRM | 450,000 | $6,750,000 | 0 | $0 | 0 | $0 |
Insider trading activities at 12 companies by Topper James N:
1. Allena Pharmaceuticals, Inc. (ALNA)
2. Phathom Pharmaceuticals, Inc. (PHAT)
3. Sierra Oncology, Inc. (SRRA)
4. Mbx Biosciences, Inc. (MBX)
5. Newamsterdam Pharma Co N.v. (NAMS)
6. Passage Bio, Inc. (PASG)
7. Aptinyx Inc. (APTX)
8. Arcutis Biotherapeutics, Inc. (ARQT)
9. Anaptysbio, Inc (ANAB)
10. Alpine Immune Sciences, Inc. (ALPN)
11. Entasis Therapeutics Holdings Inc. (ETTX)
12. Mirum Pharmaceuticals, Inc. (MIRM)
Table 1. Insider trading of Allena Pharmaceuticals, Inc. (ALNA) by Topper James N
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2017-11-06 | ALNA | Buy | 500,000 | 14.00 | 7,000,000 |
Table 2. Insider trading of Phathom Pharmaceuticals, Inc. (PHAT) by Topper James N
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2025-05-21 | PHAT | Buy | 3,780 | 3.87 | 14,609 |
| 2025-05-12 | PHAT | Buy | 12,601 | 3.04 | 38,307 |
| 2025-05-09 | PHAT | Buy | 35,602 | 3.40 | 121,224 |
Table 3. Insider trading of Sierra Oncology, Inc. (SRRA) by Topper James N
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2017-02-14 | SRRA | Buy | 5,925,926 | 1.35 | 8,000,000 |
| 2015-07-21 | DNAI | Buy | 220,000 | 17.00 | 3,740,000 |
Table 4. Insider trading of Mbx Biosciences, Inc. (MBX) by Topper James N
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2024-09-16 | MBX | Buy | 625,000 | 16.00 | 10,000,000 |
Table 5. Insider trading of Newamsterdam Pharma Co N.v. (NAMS) by Topper James N
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2025-08-11 | NAMS | Buy | 471 | 23.98 | 11,294 |
| 2025-06-24 | NAMS | Buy | 2,520 | 18.43 | 46,453 |
| 2025-06-25 | NAMS | Buy | 1,260 | 18.26 | 23,011 |
| 2025-06-16 | NAMS | Buy | 8,584 | 19.50 | 167,379 |
| 2025-03-26 | NAMS | Buy | 1,135 | 22.48 | 25,520 |
| 2025-03-04 | NAMS | Buy | 4,005 | 21.02 | 84,205 |
Table 6. Insider trading of Passage Bio, Inc. (PASG) by Topper James N
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2020-03-03 | PASG | Buy | 550,000 | 18.00 | 9,900,000 |
Table 7. Insider trading of Aptinyx Inc. (APTX) by Topper James N
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2018-06-25 | APTX | Buy | 150,000 | 16.00 | 2,400,000 |
Table 8. Insider trading of Arcutis Biotherapeutics, Inc. (ARQT) by Topper James N
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2020-02-04 | ARQT | Buy | 500,000 | 17.00 | 8,500,000 |
Table 9. Insider trading of Anaptysbio, Inc (ANAB) by Topper James N
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2017-01-31 | ANAB | Buy | 400,000 | 15.00 | 6,000,000 |
Table 10. Insider trading of Alpine Immune Sciences, Inc. (ALPN) by Topper James N
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2024-04-25 | ALPN | Sale | 19 | 64.57 | 1,226 |
| 2022-02-11 | ALPN | Buy | 112,665 | 7.10 | 800,034 |
| 2019-01-18 | ALPN | Buy | 372,439 | 5.37 | 1,999,997 |
Table 11. Insider trading of Entasis Therapeutics Holdings Inc. (ETTX) by Topper James N
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2018-09-28 | ETTX | Buy | 375,887 | 15.00 | 5,638,305 |
Table 12. Insider trading of Mirum Pharmaceuticals, Inc. (MIRM) by Topper James N
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2019-07-22 | MIRM | Buy | 450,000 | 15.00 | 6,750,000 |
Insider trading activities including stock purchases, stock sales, and option exercises
listed in the above table cannot be completely guaranteed as to their accuracy.
For more information regarding the trades made by Topper James N
(Officer of Newamsterdam Pharma Co N.v. at the time of this reporting) see
the Securities and Exchange Commission (SEC) website.