Jay Philip Siegel
CIK 1722857 · View on SEC EDGAR ↗
Insider
First SEC filing: May 22, 2025 · Latest: May 22, 2025
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 19 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
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| May 21, 2025 | MGNX | A | 22,000 | — | — | 22,000 Direct | — | Acquired | (price as of 2026-08-21) |
| May 21, 2025 | MGNX | A | 3,750 | — | — | 3,750 Direct | — | Acquired | (price as of 2026-08-21) |
| May 20, 2025 | MGNX | M | 6,500 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-21) |
| May 20, 2025 | MGNX | M | 6,500 | — | — | 11,000 Direct | +144.44% | Acquired | (price as of 2026-08-21) |
| May 21, 2024 | MGNX | A | 16,500 | — | — | 16,500 Direct | — | Acquired | (price as of 2026-08-21) |
| May 21, 2024 | MGNX | A | 6,500 | — | — | 6,500 Direct | — | Acquired | (price as of 2026-08-21) |
| May 20, 2024 | MGNX | M | 4,500 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-21) |
| May 20, 2024 | MGNX | M | 4,500 | — | — | 4,500 Direct | — | Acquired | (price as of 2026-08-21) |
| May 31, 2023 | MGNX | A | 21,490 | — | — | 21,490 Direct | — | Acquired | (price as of 2026-08-21) |
| May 31, 2023 | MGNX | A | 4,500 | — | — | 4,500 Direct | — | Acquired | (price as of 2026-08-21) |
| May 31, 2023 | MGNX | A | 19,000 | — | — | 19,000 Direct | — | Acquired | (price as of 2026-08-21) |
| May 19, 2022 | MGNX | A | 24,080 | — | — | 24,080 Direct | — | Acquired | (price as of 2026-08-21) |
| May 19, 2022 | MGNX | A | 18,000 | — | — | 18,000 Direct | — | Acquired | (price as of 2026-08-21) |
| May 13, 2021 | MGNX | A | 15,000 | — | — | 15,000 Direct | — | Acquired | (price as of 2026-08-21) |
| May 14, 2020 | MGNX | A | 15,000 | — | — | 15,000 Direct | — | Acquired | (price as of 2026-08-21) |
| May 16, 2019 | MGNX | A | 10,000 | — | — | 10,000 Direct | — | Acquired | (price as of 2026-08-21) |
| May 17, 2018 | MGNX | A | 10,000 | — | — | 10,000 Direct | — | Acquired | (price as of 2026-08-21) |
| May 17, 2018 | MGNX | A | 10,000 | — | — | 10,000 Direct | — | Acquired | (price as of 2026-08-21) |
| Nov. 13, 2017 | MGNX | A | 20,000 | — | — | 20,000 Direct | — | Acquired | (price as of 2026-08-21) |
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 |
|---|---|---|---|---|---|---|---|
| May 21, 2025 | MGNX | Stock Option (right to buy) | Common Stock (22,000) | $1.49 | May 21, 2035 | 22,000 | Acquired |
| May 21, 2025 | MGNX | Restricted Stock Unit | Common Stock (3,750) | — | — | 3,750 | Acquired |
| May 20, 2025 | MGNX | Restricted Stock Unit | Common Stock (6,500) | — | — | 6,500 | Disposed |
| May 21, 2024 | MGNX | Stock Option (right to buy) | Common Stock (16,500) | $4.26 | May 21, 2034 | 16,500 | Acquired |
| May 21, 2024 | MGNX | Restricted Stock Unit | Common Stock (6,500) | — | — | 6,500 | Acquired |
| May 20, 2024 | MGNX | Restricted Stock Unit | Common Stock (4,500) | — | — | 4,500 | Disposed |
| May 31, 2023 | MGNX | Stock Option (right to buy) | Common Stock | $4.67 | May 31, 2033 | 21,490 | Acquired |
| May 31, 2023 | MGNX | Restricted Stock Unit | Common Stock (4,500) | — | — | 4,500 | Acquired |
| May 31, 2023 | MGNX | Stock Option (right to buy) | Common Stock (19,000) | $4.67 | May 31, 2033 | 19,000 | Acquired |
| May 19, 2022 | MGNX | Stock Option (right to buy) | Common Stock | $3.90 | May 19, 2032 | 24,080 | Acquired |
| May 19, 2022 | MGNX | Stock Option (right to buy) | Common Stock (18,000) | $3.90 | May 19, 2032 | 18,000 | Acquired |
| May 13, 2021 | MGNX | Stock Option (right to buy) | Common Stock (15,000) | $28.88 | May 13, 2031 | 15,000 | Acquired |
| May 14, 2020 | MGNX | Stock Option (right to buy) | Common Stock (15,000) | $24.97 | May 14, 2030 | 15,000 | Acquired |
| May 16, 2019 | MGNX | Stock Option (right to buy) | Common Stock (10,000) | $18.00 | May 16, 2029 | 10,000 | Acquired |
| May 17, 2018 | MGNX | Stock Option (right to buy) | Common Stock (10,000) | — | May 17, 2028 | 10,000 | Acquired |
| May 17, 2018 | MGNX | Stock Option (right to buy) | Common Stock (10,000) | $2.34 | May 17, 2028 | 10,000 | Acquired |
| Nov. 13, 2017 | MGNX | Stock Option (right to buy) | Common Stock (20,000) | $17.85 | Nov. 13, 2017 | 20,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).