Katharine Knobil
CIK 1768011 · View on SEC EDGAR ↗
Insider
First SEC filing: Dec. 9, 2021 · Latest: June 11, 2026
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 9 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 10, 2026 | KRRO | A | 14,677 | — | — | 14,677 Direct | — | Acquired | (price as of 2026-08-21) |
| June 11, 2025 | KRRO | A | 6,010 | — | — | 6,010 Direct | — | Acquired | (price as of 2026-08-21) |
| Feb. 12, 2025 | MRKR | A | 30,000 | — | — | 30,000 Direct | — | Acquired | (price as of 2026-08-21) |
| Aug. 26, 2024 | KRRO | A | 9,041 | — | — | 9,041 Direct | — | Acquired | (price as of 2026-08-21) |
| June 7, 2023 | PLRX | A | 14,000 | — | — | 14,000 Direct | — | Acquired | (price as of 2026-08-21) |
| June 6, 2023 | MRKR | A | 8,000 | — | — | 8,000 Direct | — | Acquired | (price as of 2026-08-21) |
| Sept. 14, 2022 | PLRX | A | 30,000 | — | — | 30,000 Direct | — | Acquired | (price as of 2026-08-21) |
| May 24, 2022 | MRKR | A | 80,000 | — | — | 80,000 Direct | — | Acquired | (price as of 2026-08-21) |
| Dec. 8, 2021 | MRKR | A | 125,000 | — | — | 125,000 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 |
|---|---|---|---|---|---|---|---|
| June 10, 2026 | KRRO | Stock Option (Right to Buy) | Common Stock (14,677) | $10.59 | June 9, 2036 | 14,677 | Acquired |
| June 11, 2025 | KRRO | Stock Option (Right to Buy) | Common Stock (6,010) | $14.87 | June 10, 2035 | 6,010 | Acquired |
| Feb. 12, 2025 | MRKR | Stock Option (right to buy) | Common Stock (30,000) | $1.59 | Feb. 12, 2035 | 30,000 | Acquired |
| Aug. 26, 2024 | KRRO | Stock Option (Right to Buy) | Common Stock (9,041) | $49.00 | Aug. 25, 2034 | 9,041 | Acquired |
| June 7, 2023 | PLRX | Stock Option (Right to Buy) | Common Stock (14,000) | $23.09 | June 7, 2033 | 14,000 | Acquired |
| June 6, 2023 | MRKR | Stock Option (right to buy) | Common Stock (8,000) | $1.72 | June 5, 2033 | 8,000 | Acquired |
| Sept. 14, 2022 | PLRX | Stock Option (Right to Buy) | Common Stock (30,000) | $24.23 | Sept. 13, 2032 | 30,000 | Acquired |
| May 24, 2022 | MRKR | Stock Option (Right to Buy) | Common Stock (80,000) | $0.34 | May 23, 2032 | 80,000 | Acquired |
| Dec. 8, 2021 | MRKR | Stock Option (Right to Buy) | Common Stock (125,000) | $1.20 | Dec. 7, 2031 | 125,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 1 holding
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Dec. 9, 2021 | MRKR | Common Stock | 1,500 | Indirect |