Eric Blasius Risser
CIK 1587774 · View on SEC EDGAR ↗
Insider
First SEC filing: Oct. 9, 2013 · Latest: Oct. 9, 2013
On this page
- Insider at Companies where this person is a reporting insider.
- Insider transactions Every share this person bought or sold, from Form 4 filings.
- Derivatives Options and other derivative holdings reported by this person.
- Initial holdings The stakes this person held when they first started reporting.
- Compensation Executive pay disclosed in company proxy statements.
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 77 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
77 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| March 4, 2024 | MGNX | S 10b5-1 | 26,159 | $19.63 | $513,501 | 38,900 Direct | -40.21% | Disposed | -78.8% (price as of 2026-08-20) |
| March 4, 2024 | MGNX | S 10b5-1 | 15,000 | $20.00 | $300,000 | 65,059 Direct | -18.74% | Disposed | -79.2% (price as of 2026-08-20) |
| Dec. 29, 2020 | MGNX | S 10b5-1 | 500 | $24.10 | $12,050 | 44,468 Direct | -1.11% | Disposed | -82.8% (price as of 2026-08-20) |
| Nov. 30, 2020 | MGNX | S 10b5-1 | 500 | $23.35 | $11,675 | 44,468 Direct | -1.11% | Disposed | -82.2% (price as of 2026-08-20) |
| Oct. 28, 2020 | MGNX | S 10b5-1 | 1,500 | $20.69 | $31,035 | 44,468 Direct | -3.26% | Disposed | -79.9% (price as of 2026-08-20) |
| Sept. 28, 2020 | MGNX | S 10b5-1 | 500 | $25.33 | $12,665 | 44,468 Direct | -1.11% | Disposed | -83.6% (price as of 2026-08-20) |
| Aug. 26, 2020 | MGNX | S 10b5-1 | 500 | $27.10 | $13,550 | 44,468 Direct | -1.11% | Disposed | -84.7% (price as of 2026-08-20) |
| July 27, 2020 | MGNX | S 10b5-1 | 3,000 | $25.63 | $76,890 | 44,468 Direct | -6.32% | Disposed | -83.8% (price as of 2026-08-20) |
| July 27, 2020 | MGNX | S 10b5-1 | 1,000 | $25.14 | $25,140 | 47,468 Direct | -2.06% | Disposed | -83.5% (price as of 2026-08-20) |
| July 27, 2020 | MGNX | S 10b5-1 | 489 | $25.13 | $12,289 | 44,468 Direct | -1.09% | Disposed | -83.5% (price as of 2026-08-20) |
| July 2, 2020 | MGNX | S 10b5-1 | 3,100 | $30.00 | $93,000 | 44,468 Direct | -6.52% | Disposed | -86.1% (price as of 2026-08-20) |
| June 24, 2020 | MGNX | S 10b5-1 | 500 | $28.49 | $14,245 | 44,468 Direct | -1.11% | Disposed | -85.4% (price as of 2026-08-20) |
| May 26, 2020 | MGNX | S 10b5-1 | 500 | $26.59 | $13,295 | 44,468 Direct | -1.11% | Disposed | -84.4% (price as of 2026-08-20) |
| May 6, 2020 | MGNX | S 10b5-1 | 3,532 | $25.00 | $88,300 | 44,468 Direct | -7.36% | Disposed | -83.4% (price as of 2026-08-20) |
| May 6, 2020 | MGNX | S 10b5-1 | 3,000 | $20.00 | $60,000 | 48,000 Direct | -5.88% | Disposed | -79.2% (price as of 2026-08-20) |
| May 6, 2020 | MGNX | S 10b5-1 | 1,000 | $15.00 | $15,000 | 51,000 Direct | -1.92% | Disposed | -72.3% (price as of 2026-08-20) |
| May 6, 2020 | MGNX | S 10b5-1 | 500 | $10.00 | $5,000 | 52,000 Direct | -0.95% | Disposed | -58.5% (price as of 2026-08-20) |
| Feb. 20, 2020 | MGNX | S 10b5-1 | 500 | $10.84 | $5,420 | 32,468 Direct | -1.52% | Disposed | -61.7% (price as of 2026-08-20) |
| Feb. 5, 2020 | MGNX | S 10b5-1 | 623 | $10.00 | $6,230 | 32,468 Direct | -1.88% | Disposed | -58.5% (price as of 2026-08-20) |
| Feb. 4, 2020 | MGNX | S 10b5-1 | 30 | $10.00 | $300 | 32,468 Direct | -0.09% | Disposed | -58.5% (price as of 2026-08-20) |
| May 22, 2019 | MGNX | S 10b5-1 | 1,000 | $19.03 | $19,030 | 30,806 Direct | -3.14% | Disposed | -78.2% (price as of 2026-08-20) |
| May 20, 2019 | MGNX | S 10b5-1 | 3,000 | $18.38 | $55,140 | 30,806 Direct | -8.87% | Disposed | -77.4% (price as of 2026-08-20) |
| March 12, 2018 | MGNX | S 10b5-1 | 1,000 | $31.08 | $31,080 | 9,100 Direct | -9.90% | Disposed | -86.6% (price as of 2026-08-20) |
Showing latest 100 of 144 transactions
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 (16,665) | — | — | 16,665 | Disposed |
| Feb. 8, 2025 | MGNX | Restricted Stock Unit | Common Stock (11,168) | — | — | 11,168 | Disposed |
| Feb. 7, 2025 | MGNX | Restricted Stock Unit | Common Stock (20,000) | — | — | 20,000 | Acquired |
| Feb. 7, 2025 | MGNX | Employee Stock Option (right to buy) | Common Stock (120,000) | $2.60 | Feb. 7, 2035 | 120,000 | Acquired |
| March 4, 2024 | MGNX | Employee stock option (right to buy) | Common Stock (15,000) | $10.15 | Feb. 22, 2032 | 15,000 | Disposed |
| Feb. 15, 2024 | MGNX | Restricted Stock Unit | Common Stock (16,670) | — | — | 16,670 | Disposed |
| Feb. 8, 2024 | MGNX | Restricted Stock Unit | Common Stock (33,500) | — | — | 33,500 | Acquired |
| Feb. 8, 2024 | MGNX | Employee Stock Option (right to buy) | Common Stock (90,000) | $18.30 | Feb. 8, 2034 | 90,000 | Acquired |
| Feb. 15, 2023 | MGNX | Restricted Stock Unit | Common Stock (50,000) | — | — | 50,000 | Acquired |
| Feb. 15, 2023 | MGNX | Employee stock option (right to buy) | Common Stock (200,000) | $4.82 | Feb. 15, 2033 | 200,000 | Acquired |
| Oct. 28, 2022 | MGNX | Employee stock option (right to buy) | Common Stock (8,500) | $1.51 | Jan. 5, 2023 | 8,500 | Disposed |
| March 4, 2022 | MGNX | Employee stock option (right to buy) | Common Stock (500) | $0.94 | March 13, 2022 | 500 | Disposed |
| Feb. 22, 2022 | MGNX | Employee stock option (right to buy) | Common Stock (170,000) | $10.15 | Feb. 22, 2032 | 170,000 | Acquired |
| Feb. 22, 2021 | MGNX | Employee stock option (right to buy) | Common Stock (95,000) | $19.18 | Feb. 22, 2031 | 95,000 | Acquired |
| Dec. 29, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (500) | $1.51 | Jan. 5, 2023 | 500 | Disposed |
| Nov. 30, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (500) | $1.51 | Jan. 5, 2023 | 500 | Disposed |
| Oct. 28, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (1,500) | $1.51 | Jan. 5, 2023 | 1,500 | Disposed |
| Sept. 28, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (500) | $1.51 | Jan. 5, 2023 | 500 | Disposed |
| Aug. 26, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (500) | $1.51 | Jan. 5, 2023 | 500 | Disposed |
| July 27, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (4,000) | $1.51 | Jan. 5, 2023 | 4,000 | Disposed |
| July 27, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (489) | $0.94 | Jan. 8, 2021 | 489 | Disposed |
| July 2, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (3,100) | $1.51 | Jan. 5, 2023 | 3,100 | Disposed |
| June 24, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (500) | $0.94 | Jan. 8, 2021 | 500 | Disposed |
| May 26, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (500) | $0.94 | Jan. 8, 2021 | 500 | Disposed |
| May 6, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (7,532) | $1.51 | Jan. 5, 2023 | 7,532 | Disposed |
| May 6, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (500) | $0.94 | Jan. 8, 2021 | 500 | Disposed |
| April 16, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (6,000) | $0.94 | Jan. 8, 2021 | 6,000 | Disposed |
| March 13, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (6,000) | $0.94 | March 13, 2022 | 6,000 | Disposed |
| Feb. 20, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (90,000) | $11.50 | Feb. 20, 2030 | 90,000 | Acquired |
| Feb. 20, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (500) | $0.94 | March 13, 2022 | 500 | Disposed |
| Feb. 5, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (623) | $0.94 | March 13, 2022 | 623 | Disposed |
| Feb. 4, 2020 | MGNX | Employee stock option (right to buy) | Common Stock (30) | $0.94 | March 13, 2022 | 30 | Disposed |
| Sept. 27, 2019 | MGNX | Stock Option (right to buy) | Common Stock (1,662) | $0.94 | Jan. 9, 2020 | 1,662 | Disposed |
| May 22, 2019 | MGNX | Stock Option (right to buy) | Common Stock (1,000) | $0.94 | Jan. 9, 2020 | 1,000 | Disposed |
| May 20, 2019 | MGNX | Employee stock option (right to buy) | Common Stock (3,000) | $0.94 | March 13, 2022 | 3,000 | Disposed |
| March 14, 2019 | MGNX | Employee stock option (right to buy) | Common Stock (2,497) | $0.94 | March 23, 2019 | 2,497 | Disposed |
| Feb. 21, 2019 | MGNX | Employee stock option (right to buy) | Common Stock (85,000) | $21.88 | Feb. 21, 2029 | 85,000 | Acquired |
| Jan. 28, 2019 | MGNX | Employee stock option (right to buy) | Common Stock (6,000) | $0.94 | March 23, 2019 | 6,000 | Disposed |
| Dec. 12, 2018 | MGNX | Employee stock option (right to buy) | Common Stock (5,000) | $0.94 | March 23, 2019 | 5,000 | Disposed |
| Nov. 13, 2018 | MGNX | Employee stock option (right to buy) | Common Stock (4,000) | $0.94 | March 23, 2019 | 4,000 | Disposed |
| Oct. 22, 2018 | MGNX | Employee stock option (right to buy) | Common Stock (3,000) | $0.94 | March 23, 2019 | 3,000 | Disposed |
| March 12, 2018 | MGNX | Employee stock option (right to buy) | Common Stock (1,000) | $0.94 | March 23, 2019 | 1,000 | Disposed |
| March 5, 2018 | MGNX | Employee stock option (right to buy) | Common Stock (4,000) | $0.94 | March 23, 2019 | 4,000 | Disposed |
| March 2, 2018 | MGNX | Employee stock option (right to buy) | Common Stock (70,000) | $28.94 | March 2, 2028 | 70,000 | Acquired |
| Feb. 28, 2018 | MGNX | Employee stock option (right to buy) | Common Stock (1,000) | $0.94 | March 23, 2019 | 1,000 | Disposed |
| Jan. 24, 2018 | MGNX | Employee stock option (right to buy) | Common Stock (3,000) | $0.94 | March 23, 2019 | 3,000 | Disposed |
| Jan. 24, 2018 | MGNX | Employee stock option (right to buy) | Common Stock (3,000) | $0.94 | March 23, 2019 | 3,000 | Disposed |
| Jan. 17, 2018 | MGNX | Employee stock option (right to buy) | Common Stock (2,000) | $0.94 | March 23, 2019 | 2,000 | Disposed |
| Sept. 5, 2017 | MGNX | Employee stock option (right to buy) | Common Stock (2,000) | $0.94 | March 23, 2019 | 2,000 | Disposed |
| Feb. 15, 2017 | MGNX | Common Stock | Common Stock (55,000) | $20.53 | Feb. 15, 2027 | 55,000 | Acquired |
| Feb. 8, 2016 | MGNX | Employee Stock Option (right to buy) | Common Stock (2,500) | $0.94 | March 23, 2019 | 2,500 | Disposed |
| Dec. 23, 2015 | MGNX | Employee Stock Option (right to buy) | Common Stock (1,500) | $0.94 | March 23, 2019 | 1,500 | Disposed |
| Dec. 18, 2015 | MGNX | Employee Stock Option (right to buy) | Common Stock (45,000) | $31.43 | Dec. 18, 2025 | 45,000 | Acquired |
| Dec. 22, 2014 | MGNX | Employee Stock Option (right to buy) | Common Stock (5,000) | $0.94 | March 23, 2019 | 5,000 | Disposed |
| Dec. 18, 2014 | MGNX | Stock Option (right to buy) | Common Stock (10,000) | $0.09 | March 23, 2019 | 10,000 | Disposed |
| Dec. 12, 2014 | MGNX | Employee Stock Option (right to buy) | Common Stock (50,000) | $29.68 | Dec. 12, 2024 | 50,000 | Acquired |
| Nov. 24, 2014 | MGNX | Stock Option (right to buy) | Common Stock (10,000) | $0.94 | March 23, 2019 | 10,000 | Disposed |
| Nov. 13, 2014 | MGNX | Stock Option (right to buy) | Common Stock (10,000) | $0.94 | March 23, 2019 | 10,000 | Disposed |
| Nov. 12, 2014 | MGNX | Stock Option (right to buy) | Common Stock (10,000) | $0.94 | March 23, 2019 | 10,000 | Disposed |
| June 30, 2014 | MGNX | Stock Option (right to buy) | Common Stock (8,000) | $0.94 | March 24, 2019 | 8,000 | Disposed |
| Oct. 9, 2013 | MGNX | Stock Option (right to buy) | Common Stock (24,395) | $16.00 | Oct. 9, 2023 | 24,395 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 10 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Oct. 9, 2013 | MGNX | Common Stock | 13,316 | Direct |
| Oct. 9, 2013 | MGNX | Stock Option (right to buy)→ Common Stock | — | Direct |
| Oct. 9, 2013 | MGNX | Stock Option (right to buy)→ Common Stock | — | Direct |
| Oct. 9, 2013 | MGNX | Stock Option (right to buy)→ Common Stock | — | Direct |
| Oct. 9, 2013 | MGNX | Stock Option (right to buy)→ Common Stock | — | Direct |
| Oct. 9, 2013 | MGNX | Stock Option (right to buy)→ Common Stock | — | Direct |
| Oct. 9, 2013 | MGNX | Stock Option (right to buy)→ Common Stock | — | Direct |
| Oct. 9, 2013 | MGNX | Stock Option (right to buy)→ Common Stock | — | Direct |
| Oct. 9, 2013 | MGNX | Stock Option (right to buy)→ Common Stock | — | Direct |
| Oct. 9, 2013 | MGNX | Stock Option (right to buy)→ Common Stock | — | Direct |
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $561,568 | $150,000 | $52,000 | $1,049,386 | $251,900 | — | $14,000 | $2,078,854 |
| 2022 | $460,802 | — | — | $1,263,899 | $178,360 | — | $12,200 | $1,915,261 |
| 2021 | $427,957 | — | — | $1,328,091 | $135,327 | — | $8,700 | $1,900,075 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.