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William Heiden Insider Profile

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William Heiden, Director at Atara Biotherapeutics, holds 34.19K shares in Atara Biotherapeutics (Ticker: ATRA), holds 114.75K shares in MacroGenics (Ticker: MGNX), holds 424.61K shares in Amag Pharmaceuticals (Ticker: AMAG).
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William Heiden

William Heiden
Atara Biotherapeutics (ATRA)
Director

Ranked #11,393 out of 108,921 Corporate Insiders

Profitable Transactions

75%
3 out of 4 Profitable Transactions

Average Return

+54.80%
Average return per transaction
Time Frame
1 Year
Compare to
No Benchmark
How are Insiders Ranked?

Insider Holdings

$839K
60.21%
39.79%
A breakdown of William Heiden's holdings
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Insider Roles

MacroGenics
(MGNX)
Director
Atara Biotherapeutics
(ATRA)
Director
Roles that William Heiden holds in companies
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Most Profitable Insider Trade

Stock:
MacroGenics
(MGNX)
Rating:Informative Buy
Date:Aug 21, 2025 - Aug 21, 2026
Return:+184.70%
The most profitable trade made by William Heiden
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William Heiden's Trading History

Company Name
Last Transaction Date
Insider Position
Last Transaction
Last Transaction Amount
Holding Value
ATRA
Atara Biotherapeutics
Jun 11, 2026
Director
Uninformative Buy
―
$333.67K
MGNX
MacroGenics
May 20, 2026
Director
Uninformative Buy
16.31K
$504.90K
AMAG
Amag Pharmaceuticals
Mar 04, 2020
―
Uninformative Sell
34.50K
$5.84M
List of latest transactions for each holding click on a transaction to see William Heiden's performance on stock
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William Heiden insider profile FAQ

What is the percentage of profitable transactions made by William Heiden?
The percentage of profitable transactions made by William Heiden is 75%.
    What is the average return per transaction made by William Heiden?
    The average return per transaction made by William Heiden is 54.80%.
      What stocks does William Heiden hold?
      William Heiden holds: ATRA, MGNX, AMAG stocks.
        What was William Heiden’s latest transaction?
        William Heiden latest transaction was an Uninformative Buy of ―.
          What was William Heiden's most profitable transaction?
          William Heiden’s most profitable transaction was an Informative Buy of MGNX stock on August 21, 2025. The return on the trade was 184.70%.
            What is William Heiden's role in Atara Biotherapeutics?
            William Heiden's role in Atara Biotherapeutics 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.