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James Topper Insider Profile
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James Topper, Director at Sierra Oncology, holds 6.81M shares in NewAmsterdam Pharma Company (Ticker: NAMS), holds 5.86M shares in Phathom Pharmaceuticals (Ticker: PHAT), holds 0.00 shares in Alpine Immune Sciences (Ticker: ALPN). Most recently, James Topper Bought ― shares of NewAmsterdam Pharma Company on Mar 06, 2025 for an estimated value of 84.19K.
Profitable Transactions
3 out of 6 Profitable Transactions
Average Return
-9.50%
Average return per transaction
Time Frame
Compare to
Insider Holdings
Insider Roles
Roles that James Topper holds in companies
Most Profitable Insider Trade
Stock:
Sierra Oncology
(SRRA)
(SRRA)
Rating:Informative Buy
Date:Feb 16, 2017 - Feb 16, 2018
Return:+108.60%
The most profitable trade made by James Topper
James Topper's Trading History
Sierra Oncology
Feb 16, 2017
―
Informative Buy
8.00M
―
Alpine Immune Sciences
May 20, 2024
―
Uninformative Sell
―
$0.00
AnaptysBio
Nov 18, 2020
Director, Ten Percent Owner
Uninformative Buy
―
$16.02M
Allena Pharmaceuticals
―
―
―
―
Aptinyx
Jun 26, 2018
―
Uninformative Buy
―
$306.25K
Entasis Therapeutics Holdings
Oct 02, 2018
―
Uninformative Buy
―
$2.96M
Phathom Pharmaceuticals
May 24, 2024
Director, Ten Percent Owner
Uninformative Buy
―
$29.67M
NewAmsterdam Pharma Company
Mar 06, 2025
Director
Informative Buy
84.19K
$162.16M
Portola Pharma
May 28, 2013
―
Uninformative Buy
―
$25.76M
Amicus
―
Director
―
$31.19M
La Jolla Pharma
Feb 26, 2009
―
Informative Sell
341.42K
$0.00
List of latest transactions for each holding click on a transaction to see James Topper's performance on stock
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James Topper insider profile FAQ
What is the percentage of profitable transactions made by James Topper?
The percentage of profitable transactions made by James Topper is 50%.
What is the average return per transaction made by James Topper?
The average return per transaction made by James Topper is -9.50%.
What stocks does James Topper hold?
James Topper holds: SRRA, ALPN, ANAB, ALNAQ, APTX, ETTX, PHAT, NAMS, PTLA, FOLD, LJPC stocks.
What was James Topper’s latest transaction?
James Topper latest transaction was an Informative Buy of $84.19K.
What was James Topper's most profitable transaction?
James Topper’s most profitable transaction was an Informative Buy of SRRA stock on February 16, 2017. The return on the trade was 108.60%.
What is James Topper's role in Sierra Oncology?
James Topper's role in Sierra Oncology is Director.
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