Insider · CIK 0001214939
William K Heiden
Files at MGNX (MACROGENICS INC), ATRA (Atara Biotherapeutics, Inc.). First filing Aug 21, 2025, latest Aug 21, 2025.
William K Heiden files SEC Form 4 as director at MGNX (MACROGENICS INC), and also at ATRA (Atara Biotherapeutics, Inc.). Since Aug 21, 2025, William K Heiden has reported 1 open-market buy worth $151k and 0 open-market sells worth $0, the latest filed on Aug 21, 2025.
A track record needs three past buys with six months of prices behind them; William K Heiden has 0, so none is measured yet.
The newest scored trade: bought $151k of MGNX on Aug 19, 2025, filed Aug 21, 2025, scored 36 (weak).
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
MGNX: MACROGENICS INC
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
Transactions
Every row this insider has filed, 12 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Jun 9, 2026 | ATRA Atara Biotherapeutics, Inc. | AGrant or award Common Stock | +12,000 | $0.00 | $0 | 34,188 | Jun 11, 2026 |
| May 18, 2026 | MGNX MACROGENICS INC | MOption exercise Common Stock | +3,750 | - | - | 114,750 | May 20, 2026 |
| May 18, 2026 | MGNX MACROGENICS INC | MOption exercise Restricted Stock Unitderivative | -3,750 | $0.00 | $0 | 0 | May 20, 2026 |
| May 19, 2026 | MGNX MACROGENICS INC | AGrant or award Restricted Stock Unitderivative | +3,750 | $0.00 | $0 | 3,750 | May 20, 2026 |
| May 19, 2026 | MGNX MACROGENICS INC | AGrant or award Stock Option (right to buy)derivative | +22,000 | $0.00 | $0 | 22,000 | May 20, 2026 |
| Aug 19, 2025 | MGNX MACROGENICS INC | POpen-market purchase Common Stock | +50,500 | $1.52 | $77k | 61,500 | Aug 21, 2025 |
| Aug 20, 2025 | MGNX MACROGENICS INC | POpen-market purchase Common Stock | +49,500 | $1.49 | $74k | 111,000 | Aug 21, 2025 |
| Jun 10, 2025 | ATRA Atara Biotherapeutics, Inc. | AGrant or award Common Stock | +7,828 | $0.00 | $0 | 22,188 | Jun 12, 2025 |
| May 20, 2025 | MGNX MACROGENICS INC | MOption exercise Common Stock | +6,500 | - | - | 11,000 | May 22, 2025 |
| May 20, 2025 | MGNX MACROGENICS INC | MOption exercise Restricted Stock Unitderivative | -6,500 | $0.00 | $0 | 0 | May 22, 2025 |
| May 21, 2025 | MGNX MACROGENICS INC | AGrant or award Restricted Stock Unitderivative | +3,750 | $0.00 | $0 | 3,750 | May 22, 2025 |
| May 21, 2025 | MGNX MACROGENICS INC | AGrant or award Stock Option (right to buy)derivative | +22,000 | $0.00 | $0 | 22,000 | May 22, 2025 |
Questions about William K Heiden
Answered from the filings on this page, as of the latest one.
Is William K Heiden buying or selling?
Not in the last 12 months. William K Heiden's latest open-market trade on SEC Form 4 was bought $151k of MGNX on Aug 19, 2025.
How did William K Heiden's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and William K Heiden has 0.
Where does William K Heiden file Form 4?
William K Heiden has filed Form 4 at MGNX (MACROGENICS INC); ATRA (Atara Biotherapeutics, Inc.). A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.