Keith R. Harris
CIK 1742703 · View on SEC EDGAR ↗
Insider
First SEC filing: June 8, 2018 · Latest: June 15, 2026
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 12 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 |
|---|---|---|---|---|---|---|---|---|---|
| June 11, 2026 | MGTX | A | 106,441 | — | — | 106,441 Direct | — | Acquired | (price as of 2026-08-20) |
| June 10, 2026 | MGTX | M | 75,000 | — | — | 200,000 | — | — | (price as of 2026-08-20) |
| June 8, 2023 | MGTX | A | 30,000 | — | — | 30,000 Direct | — | Acquired | (price as of 2026-08-20) |
| June 8, 2023 | MGTX | A | 30,000 | — | — | 30,000 Direct | — | Acquired | (price as of 2026-08-20) |
| June 7, 2023 | MGTX | M | 20,000 | — | — | 20,000 Direct | — | Acquired | (price as of 2026-08-20) |
| June 7, 2023 | MGTX | M | 20,000 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-20) |
| June 7, 2022 | MGTX | A | 20,000 | — | — | 20,000 Direct | — | Acquired | (price as of 2026-08-20) |
| June 7, 2022 | MGTX | A | 20,000 | — | — | 20,000 Direct | — | Acquired | (price as of 2026-08-20) |
| June 10, 2021 | MGTX | A | 20,000 | — | — | 20,000 Direct | — | Acquired | (price as of 2026-08-20) |
| June 10, 2021 | MGTX | A | 20,000 | — | — | 20,000 Direct | — | Acquired | (price as of 2026-08-20) |
| June 2, 2020 | MGTX | A | 25,000 | — | — | 25,000 Direct | — | Acquired | (price as of 2026-08-20) |
| June 19, 2019 | MGTX | A | 25,000 | — | — | 25,000 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 |
|---|---|---|---|---|---|---|---|
| June 11, 2026 | MGTX | Restricted Share Units | Ordinary Shares (106,441) | — | — | 106,441 | Acquired |
| June 8, 2023 | MGTX | Stock Option (right to buy) | Ordinary Shares (30,000) | $8.04 | June 8, 2033 | 30,000 | Acquired |
| June 8, 2023 | MGTX | Restricted Share Units | Ordinary Shares (30,000) | — | — | 30,000 | Acquired |
| June 7, 2023 | MGTX | Restricted Share Units | Ordinary Shares (20,000) | — | — | 20,000 | Disposed |
| June 7, 2022 | MGTX | Stock Option (right to buy) | Ordinary Shares (20,000) | $8.25 | June 7, 2032 | 20,000 | Acquired |
| June 7, 2022 | MGTX | Restricted Share Units | Ordinary Shares (20,000) | — | — | 20,000 | Acquired |
| June 10, 2021 | MGTX | Restricted Share Units | Ordinary Shares (20,000) | — | — | 20,000 | Acquired |
| June 10, 2021 | MGTX | Stock Option (right to buy) | Ordinary Shares (20,000) | $14.88 | June 9, 2031 | 20,000 | Acquired |
| June 2, 2020 | MGTX | Stock Option (right to buy) | Ordinary Shares (25,000) | $13.85 | June 1, 2030 | 25,000 | Acquired |
| June 19, 2019 | MGTX | Stock Option (right to buy) | Ordinary Shares (25,000) | $21.28 | June 19, 2029 | 25,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 2 holdings
Securities held when first becoming an insider, per SEC Form 3.