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James Topper Insider Profile

11 Followers
James Topper, Director at Sierra Oncology, holds 6.83M shares in NewAmsterdam Pharma Company (Ticker: NAMS), holds 5.93M 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 Jun 26, 2025 for an estimated value of 69.45K.
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James Topper

James Topper
Sierra Oncology (SRRA)
Director

Ranked #5,415 out of 102,830 Corporate Insiders

Profitable Transactions

50%
6 out of 12 Profitable Transactions

Average Return

+29.40%
Average return per transaction
Time Frame
1 Year
Compare to
No Benchmark

Insider Holdings

$259M
62.20%
19.86%
9.41%
8.52%
A breakdown of James Topper's holdings

Insider Roles

NewAmsterdam Pharma Company
(NAMS)
Director
Phathom Pharmaceuticals
(PHAT)
Director, Ten Percent Owner
Amicus
(FOLD)
Director
AnaptysBio
(ANAB)
Director, Ten Percent Owner
Roles that James Topper holds in companies

Most Profitable Insider Trade

Stock:
Phathom Pharmaceuticals
(PHAT)
Rating:Informative Buy
Date:May 13, 2025 - Today
Return:+152.20%
The most profitable trade made by James Topper

James Topper's Trading History

Company Name
Last Transaction Date
Insider Position
Last Transaction
Last Transaction Amount
Holding Value
SRRA
Sierra Oncology
Feb 16, 2017
Informative Buy
8.00M
ALPN
Alpine Immune Sciences
May 20, 2024
Uninformative Sell
$0.00
AnaptysBio
Nov 18, 2020
Director, Ten Percent Owner
Uninformative Buy
$22.10M
ALNAQ
Allena Pharmaceuticals
APTX
Aptinyx
Jun 26, 2018
Uninformative Buy
$306.25K
ETTX
Entasis Therapeutics Holdings
Oct 02, 2018
Uninformative Buy
$2.96M
Phathom Pharmaceuticals
Jun 05, 2025
Director, Ten Percent Owner
Uninformative Buy
$51.50M
NewAmsterdam Pharma Company
Jun 26, 2025
Director
Informative Buy
69.45K
$161.26M
PTLA
Portola Pharma
May 28, 2013
Uninformative Buy
$25.76M
Amicus
Director
$24.40M
LJPC
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

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 29.40%.
      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 $69.45K.
          What was James Topper's most profitable transaction?
          James Topper’s most profitable transaction was an Informative Buy of PHAT stock on May 13, 2025. The return on the trade was 152.20%.
            What is James Topper's role in Sierra Oncology?
            James Topper's role in Sierra Oncology is Director.
              How can I follow the stock ratings of top corporate insiders?
              Head over to our Expert Center to see a list of the Top 100 corporate insiders and follow the corporate insiders of your choice. Visit their profiles for more details about their stock transactions and see how they perform on a stock-by-stock basis.