Jeffrey Stuart Peters
CIK 1706903 · View on SEC EDGAR ↗
Insider
First SEC filing: May 22, 2017 · Latest: Feb. 12, 2018
On this page
Insider at
Insider transactions
0 buys (P)
1 sells (S)
Net:
$-129,086
+ 39 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
39 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 19, 2026 | MGNX | S 10b5-1 | 31,105 | $4.15 | $129,086 | 0 Direct | -100.00% | Disposed | 0.1% (price as of 2026-08-20) |
| April 4, 2024 | MGNX | S 10b5-1 | 3,165 | $18.22 | $57,666 | 0 Direct | -100.00% | Disposed | -77.2% (price as of 2026-08-20) |
| April 4, 2024 | MGNX | S 10b5-1 | 5,351 | $17.74 | $94,927 | 3,165 Direct | -62.83% | Disposed | -76.6% (price as of 2026-08-20) |
| April 4, 2024 | MGNX | S 10b5-1 | 232 | $16.38 | $3,800 | 8,516 Direct | -2.65% | Disposed | -74.6% (price as of 2026-08-20) |
| April 4, 2024 | MGNX | S 10b5-1 | 147 | $15.51 | $2,280 | 8,748 Direct | -1.65% | Disposed | -73.2% (price as of 2026-08-20) |
| April 4, 2024 | MGNX | S 10b5-1 | 42,500 | $15.07 | $640,475 | 8,895 Direct | -82.69% | Disposed | -72.4% (price as of 2026-08-20) |
| March 6, 2024 | MGNX | S 10b5-1 | 19,625 | $21.50 | $421,938 | 8,895 Direct | -68.81% | Disposed | -80.7% (price as of 2026-08-20) |
| Feb. 26, 2024 | MGNX | S 10b5-1 | 16,124 | $17.22 | $277,655 | 8,895 Direct | -64.45% | Disposed | -75.9% (price as of 2026-08-20) |
| Feb. 5, 2024 | MGNX | S 10b5-1 | 21,875 | $16.50 | $360,938 | 0 Direct | -100.00% | Disposed | -74.8% (price as of 2026-08-20) |
| Feb. 5, 2024 | MGNX | S 10b5-1 | 54,376 | $16.50 | $897,204 | 21,875 Direct | -71.31% | Disposed | -74.8% (price as of 2026-08-20) |
| March 10, 2023 | MGNX | S 10b5-1 | 5,372 | $6.03 | $32,393 | 0 Direct | -100.00% | Disposed | -31.1% (price as of 2026-08-20) |
| March 8, 2021 | MGNX | S 10b5-1 | 21,749 | $26.50 | $576,348 | 0 Direct | -100.00% | Disposed | -84.3% (price as of 2026-08-20) |
| July 2, 2020 | MGNX | S 10b5-1 | 202 | $30.00 | $6,060 | 0 Direct | -100.00% | Disposed | -86.1% (price as of 2026-08-20) |
| Feb. 6, 2019 | MGNX | S 10b5-1 | 68 | $30.00 | $2,040 | 202 Direct | -25.19% | Disposed | -86.1% (price as of 2026-08-20) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Feb. 15, 2025 | MGNX | Restricted Stock Unit | Common Stock (13,332) | — | — | 13,332 | Disposed |
| Feb. 8, 2025 | MGNX | Restricted Stock Unit | Common Stock (9,001) | — | — | 9,001 | Disposed |
| Feb. 7, 2025 | MGNX | Restricted Stock Unit | Common Stock (18,000) | — | — | 18,000 | Acquired |
| Feb. 7, 2025 | MGNX | Employee Stock Option (right to buy) | Common Stock (105,000) | $2.60 | Feb. 7, 2035 | 105,000 | Acquired |
| April 4, 2024 | MGNX | Employee stock option (right to buy) | Common Stock (42,500) | $4.82 | Feb. 15, 2033 | 42,500 | Disposed |
| March 6, 2024 | MGNX | Employee stock option (right to buy) | Common Stock (8,750) | $10.15 | Feb. 22, 2032 | 8,750 | Disposed |
| March 6, 2024 | MGNX | Employee stock option (right to buy) | Common Stock (10,875) | $11.50 | Feb. 20, 2030 | 10,875 | Disposed |
| Feb. 22, 2024 | MGNX | Restricted Stock Unit | Common Stock (26,250) | — | — | 26,250 | Disposed |
| Feb. 15, 2024 | MGNX | Restricted Stock Unit | Common Stock (13,336) | — | — | 13,336 | Disposed |
| Feb. 8, 2024 | MGNX | Restricted Stock Unit | Common Stock (27,000) | — | — | 27,000 | Acquired |
| Feb. 8, 2024 | MGNX | Employee Stock Option (right to buy) | Common Stock (71,000) | $18.30 | Feb. 8, 2034 | 71,000 | Acquired |
| Feb. 5, 2024 | MGNX | Employee stock option (right to buy) | Common Stock (21,875) | $10.15 | Feb. 22, 2032 | 21,875 | Disposed |
| Feb. 5, 2024 | MGNX | Employee stock option (right to buy) | Common Stock (54,376) | $11.50 | Feb. 20, 2030 | 54,376 | Disposed |
| Feb. 22, 2023 | MGNX | Restricted Stock Unit | Common Stock (8,750) | — | — | 8,750 | Disposed |
| Feb. 15, 2023 | MGNX | Restricted Stock Unit | Common Stock (40,000) | — | — | 40,000 | Acquired |
| Feb. 15, 2023 | MGNX | Employee stock option (right to buy) | Common Stock (170,000) | $4.82 | Feb. 15, 2033 | 170,000 | Acquired |
| Feb. 22, 2022 | MGNX | Restricted Stock Unit | Common Stock (35,000) | — | — | 35,000 | Acquired |
| Feb. 22, 2022 | MGNX | Employee stock option (right to buy) | Common Stock (70,000) | $10.15 | Feb. 22, 2032 | 70,000 | Acquired |
| March 8, 2021 | MGNX | Employee stock option (right to buy) | Common Stock (21,749) | $11.50 | Feb. 20, 2030 | 21,749 | Disposed |
| Feb. 22, 2021 | MGNX | Employee stock option (right to buy) | Common Stock (90,000) | $19.18 | Feb. 22, 2031 | 90,000 | Acquired |
| Feb. 20, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (87,000) | $11.50 | Feb. 20, 2030 | 87,000 | Acquired |
| Feb. 21, 2019 | MGNX | Employee stock option (right to buy) | Common Stock (70,000) | $21.88 | Feb. 21, 2029 | 70,000 | Acquired |
| March 2, 2018 | MGNX | Employee stock option (right to buy) | Common Stock (50,000) | $28.94 | March 2, 2028 | 50,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 3 holdings
Securities held when first becoming an insider, per SEC Form 3.