William K Heiden insider trades: Macrogenics (MGNX) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where William reports to the SEC
Open-market buys and sales
11 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Aug 20, 2025 | MGNX | ↑ Buy | 100,000 | $1.51 | $151K | Direct | Aug 21, 2025 (1d) |
| Nov 10, 2023 | ATRA | ↑ Buy | 100,000 | $0.25 | $25K | Direct | Nov 14, 2023 (4d) |
| May 9, 2019 | AMAG | ↑ Buy | 10,000 | $10.70 | $107K | Direct | May 9, 2019 (0d) |
| Aug 7, 2018 | AMAG | ↓ Sell | 5,000 | $25.00 | $125K | Direct | Aug 8, 2018 (1d) |
| Jun 4, 2018 | AMAG | ↓ Sell | 20,000 | $25.00 | $500K | Direct | Jun 5, 2018 (1d) |
| Oct 1, 2015 | AMAG | ↓ Sell | 2,000 | $39.69 | $79K | Direct | Oct 2, 2015 (1d) |
| Sep 1, 2015 | AMAG | ↓ Sell | 2,000 | $61.19 | $122K | Direct | Sep 2, 2015 (1d) |
| Aug 3, 2015 | AMAG | ↓ Sell | 2,000 | $64.53 | $129K | Direct | Aug 5, 2015 (2d) |
| Jul 15, 2015 | AMAG | ↓ Sell | 20,000 | $75.00 | $1.5M | Direct | Jul 17, 2015 (2d) |
| Jul 1, 2015 | AMAG | ↓ Sell | 2,000 | $69.41 | $139K | Direct | Jul 2, 2015 (1d) |
| Jun 5, 2015 | AMAG | ↓ Sell | 66,875 | $69.90 | $4.7M | Direct | Jun 8, 2015 (3d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other MGNX insiders
Open-market trades in the last 12 months
About William K Heiden's insider trades
William K Heiden is a director at Macrogenics (MGNX). Since Jun 5, 2015, William has reported 3 open-market purchases worth $283K and 8 sales worth $7.3M on SEC Form 4. There have been no open-market trades in the last 12 months.
Their filings also include grants and awards (29 filings), shares withheld for taxes (12 filings), option exercises (7 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every MGNX insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.