David C Stump

CIK 1191235 · View on SEC EDGAR ↗

Insider

First SEC filing: May 26, 2017 · Latest: May 26, 2017

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Insider at

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 29 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 29, 2026 RGNX A 46,600 — — 46,600 Direct — Acquired (price as of 2026-08-20)
May 29, 2026 RGNX A 9,807 — — 28,861 Direct +51.47% Acquired (price as of 2026-08-20)
May 19, 2026 MGNX A 22,000 — — 22,000 Direct — Acquired (price as of 2026-08-20)
May 19, 2026 MGNX A 3,750 — — 3,750 Direct — Acquired (price as of 2026-08-20)
May 18, 2026 MGNX M 3,750 — — 0 Direct -100.00% Disposed (price as of 2026-08-20)
May 18, 2026 MGNX M 3,750 — — 14,750 Direct +34.09% Acquired (price as of 2026-08-20)
May 21, 2025 MGNX A 22,000 — — 22,000 Direct — Acquired (price as of 2026-08-20)
May 21, 2025 MGNX A 3,750 — — 3,750 Direct — Acquired (price as of 2026-08-20)
May 20, 2025 MGNX M 6,500 — — 0 Direct -100.00% Disposed (price as of 2026-08-20)
May 20, 2025 MGNX M 6,500 — — 11,000 Direct +144.44% Acquired (price as of 2026-08-20)
May 21, 2024 MGNX A 16,500 — — 16,500 Direct — Acquired (price as of 2026-08-20)
May 21, 2024 MGNX A 6,500 — — 6,500 Direct — Acquired (price as of 2026-08-20)
May 20, 2024 MGNX M 4,500 — — 0 Direct -100.00% Disposed (price as of 2026-08-20)
May 20, 2024 MGNX M 4,500 — — 4,500 Direct — Acquired (price as of 2026-08-20)
May 31, 2023 MGNX A 4,500 — — 4,500 Direct — Acquired (price as of 2026-08-20)
May 31, 2023 MGNX A 19,000 — — 19,000 Direct — Acquired (price as of 2026-08-20)
May 19, 2022 MGNX A 18,000 — — 18,000 Direct — Acquired (price as of 2026-08-20)
May 13, 2021 MGNX A 15,000 — — 15,000 Direct — Acquired (price as of 2026-08-20)
May 14, 2020 MGNX A 15,000 — — 15,000 Direct — Acquired (price as of 2026-08-20)
May 16, 2019 MGNX A 10,000 — — 10,000 Direct — Acquired (price as of 2026-08-20)
May 17, 2018 MGNX A 10,000 — — 10,000 Direct — Acquired (price as of 2026-08-20)
May 24, 2017 RGNX A 12,500 — — 12,500 Direct — Acquired (price as of 2026-08-20)
May 18, 2017 MGNX A 10,000 — — 10,000 Direct — Acquired (price as of 2026-08-20)
June 1, 2016 RGNX A 12,500 — — 12,500 Direct — Acquired (price as of 2026-08-20)
May 18, 2016 MGNX A 8,500 — — 8,500 Direct — Acquired (price as of 2026-08-20)
Oct. 14, 2015 RGNX A 25,000 — — 25,000 Direct — Acquired (price as of 2026-08-20)
May 20, 2015 MGNX A 8,500 — — 8,500 Direct — Acquired (price as of 2026-08-20)
June 5, 2014 MGNX A 6,924 — — 6,924 Direct — Acquired (price as of 2026-08-20)
Oct. 9, 2013 MGNX A 13,849 — — 13,849 Direct — Acquired (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
May 29, 2026 RGNX Stock Options (Right to Buy) Common Stock (46,600) $7.01 May 29, 2036 46,600 Acquired
May 19, 2026 MGNX Stock Option (right to buy) Common Stock (22,000) $4.52 May 19, 2036 22,000 Acquired
May 19, 2026 MGNX Restricted Stock Unit Common Stock (3,750) — — 3,750 Acquired
May 18, 2026 MGNX Restricted Stock Unit Common Stock (3,750) — — 3,750 Disposed
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 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 (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) $21.34 May 17, 2028 10,000 Acquired
May 24, 2017 RGNX Stock Option (Right to Buy) Common Stock (12,500) $18.85 May 24, 2027 12,500 Acquired
May 18, 2017 MGNX Stock Option (right to buy) Common Stock (10,000) $19.57 May 18, 2027 10,000 Acquired
June 1, 2016 RGNX Stock Option (Right to Buy) Common Stock (12,500) $12.74 June 1, 2026 12,500 Acquired
May 18, 2016 MGNX Stock Option (right to buy) Common Stock (8,500) $21.06 May 18, 2026 8,500 Acquired
Oct. 14, 2015 RGNX Stock Option (Right to Buy) Common Stock (25,000) $17.89 Oct. 14, 2025 25,000 Acquired
May 20, 2015 MGNX Stock Option (right to buy) Common Stock (8,500) $32.34 May 20, 2025 8,500 Acquired
June 5, 2014 MGNX Stock Option (right to buy) Common Stock (6,924) $20.15 June 5, 2024 6,924 Acquired
Oct. 9, 2013 MGNX Stock Option (right to buy) Common Stock (13,849) $16.00 Oct. 9, 2023 13,849 Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).