Paul Walker
Activist
First SEC filing: May 7, 2026 · Latest: May 7, 2026
Insider at
Insider transactions
3 buys (P)
0 sells (S)
Net: $20,000,000
Avg return of open purchases vs now: 9.8%
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| March 10, 2026 | KRRO | P | 242,945 | $11.11 | $2,699,119 | 242,945 Indirect | · | Acquired | -13.2% (price as of 2026-10-02) |
| March 10, 2026 | KRRO | P | 207,100 | $11.11 | $2,300,881 | 1,297,893 Indirect | +18.99% | Acquired | -13.2% (price as of 2026-10-02) |
| Feb. 9, 2026 | SGP | C | 402,273 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| Feb. 9, 2026 | SGP | C | 954,990 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| Feb. 9, 2026 | SGP | C | 737,962 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| Feb. 9, 2026 | SGP | C | 1,370,168 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| Feb. 9, 2026 | SGP | C | 1,370,168 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| Feb. 9, 2026 | SGP | C | 1,619,240 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| Feb. 9, 2026 | SGP | C | 402,273 | · | · | 1,357,263 Indirect | +42.12% | Acquired | (price as of 2026-10-02) |
| Feb. 9, 2026 | SGP | C | 954,990 | · | · | 954,990 Indirect | · | Acquired | (price as of 2026-10-02) |
| Feb. 9, 2026 | SGP | P | 937,500 | $16.00 | $15,000,000 | 6,035,038 Indirect | +18.39% | Acquired | 55.8% (price as of 2026-10-02) |
| Feb. 9, 2026 | SGP | C | 737,962 | · | · | 5,097,538 Indirect | +16.93% | Acquired | (price as of 2026-10-02) |
| Feb. 9, 2026 | SGP | C | 1,370,168 | · | · | 4,359,576 Indirect | +45.83% | Acquired | (price as of 2026-10-02) |
| Feb. 9, 2026 | SGP | C | 1,370,168 | · | · | 2,989,408 Indirect | +84.62% | Acquired | (price as of 2026-10-02) |
| Feb. 9, 2026 | SGP | C | 1,619,240 | · | · | 1,619,240 Indirect | · | Acquired | (price as of 2026-10-02) |
| Sept. 16, 2024 | MBX | C | 25,142,840 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| Sept. 16, 2024 | MBX | C | 12,299,854 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| Sept. 16, 2024 | MBX | P | 500,000 | $16.00 | $8,000,000 | 3,614,486 Indirect | +16.05% | Acquired | 265.7% (price as of 2026-10-02) |
| Sept. 16, 2024 | MBX | C | 2,091,383 | · | · | 3,114,486 Indirect | +204.42% | Acquired | (price as of 2026-10-02) |
| Sept. 16, 2024 | MBX | C | 1,023,103 | · | · | 1,023,103 Indirect | · | Acquired | (price as of 2026-10-02) |
| April 22, 2024 | KRRO | P | 17,857 | $56.00 | $999,992 | 1,090,793 Indirect | +1.66% | Acquired | -82.8% (price as of 2026-10-02) |
| July 17, 2023 | SVRA | P | 333,333 | $3.00 | $999,999 | 24,471,264 Indirect | +1.38% | Acquired | 60.3% (price as of 2026-10-02) |
| June 13, 2023 | MIRM | J | 114 | · | · | 114 Indirect | · | Acquired | (price as of 2026-10-02) |
| June 13, 2023 | MIRM | J | 30,000 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| June 13, 2023 | MIRM | J | 30,000 | · | · | 30,000 Indirect | · | Acquired | (price as of 2026-10-02) |
| June 13, 2023 | MIRM | J | 2,000,000 | · | · | 2,186,243 Indirect | -47.78% | Disposed | (price as of 2026-10-02) |
| April 11, 2022 | TRVI | P | 3,000,000 | $1.90 | $5,700,000 | 3,000,000 Indirect | · | Acquired | 632.1% (price as of 2026-10-02) |
| April 11, 2022 | TRVI | P | 948,948 | $1.90 | $1,803,001 | 948,948 Indirect | · | Acquired | 632.1% (price as of 2026-10-02) |
| April 11, 2022 | TRVI | P | 2,631,578 | $1.90 | $4,999,998 | 10,421,428 Indirect | +33.78% | Acquired | 632.1% (price as of 2026-10-02) |
| Oct. 18, 2021 | TRVI | P | 1,851,852 | · | · | 1,851,852 Indirect | · | Acquired | (price as of 2026-10-02) |
| Oct. 18, 2021 | TRVI | P | 1,851,852 | · | · | 1,851,852 Indirect | · | Acquired | (price as of 2026-10-02) |
| Oct. 18, 2021 | TRVI | P | 1,851,852 | · | · | 7,789,850 Indirect | +31.19% | Acquired | (price as of 2026-10-02) |
| June 28, 2021 | GLUE | C | 2,715,968 | · | · | 2,715,968 Indirect | · | Acquired | (price as of 2026-10-02) |
| June 28, 2021 | GLUE | C | 3,257,328 | · | · | 5,973,296 Indirect | +119.93% | Acquired | (price as of 2026-10-02) |
| June 28, 2021 | GLUE | C | 669,002 | · | · | 6,642,298 Indirect | +11.20% | Acquired | (price as of 2026-10-02) |
| June 28, 2021 | GLUE | P | 1,050,000 | $19.00 | $19,950,000 | 7,692,298 Indirect | +15.81% | Acquired | -44.7% (price as of 2026-10-02) |
| June 28, 2021 | GLUE | C | 9,588,725 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| June 28, 2021 | GLUE | C | 11,500,000 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| June 28, 2021 | GLUE | C | 2,361,912 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| March 16, 2021 | MRKR | P | 5,714,285 | $1.75 | $9,999,999 | 10,714,285 Indirect | +114.29% | Acquired | -94.0% (price as of 2026-10-02) |
| April 3, 2020 | TRVI | X | 1,500,000 | · | · | 5,938,562 Indirect | +33.79% | Acquired | (price as of 2026-10-02) |
| April 3, 2020 | TRVI | X | 1,500,000 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| April 3, 2020 | TRVI | S | 564 | $2.66 | $1,500 | 5,937,998 Indirect | -0.01% | Disposed | 422.9% (price as of 2026-10-02) |
| July 22, 2019 | MIRM | C | 29,889,945 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| July 22, 2019 | MIRM | P | 450,000 | $15.00 | $6,750,000 | 4,186,243 Indirect | +12.04% | Acquired | 452.9% (price as of 2026-10-02) |
| July 22, 2019 | MIRM | C | 3,736,243 | · | · | 3,736,243 Indirect | · | Acquired | (price as of 2026-10-02) |
| May 9, 2019 | TRVI | C | 17,099,315 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| May 9, 2019 | TRVI | P | 1,500,000 | $10.00 | $15,000,000 | 4,438,562 Indirect | +51.05% | Acquired | 39.1% (price as of 2026-10-02) |
| May 9, 2019 | TRVI | P | 1,000,000 | $10.00 | $10,000,000 | 2,938,562 Indirect | +51.58% | Acquired | 39.1% (price as of 2026-10-02) |
| May 9, 2019 | TRVI | C | 1,938,562 | · | · | 1,938,562 Indirect | · | Acquired | (price as of 2026-10-02) |
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 |
|---|---|---|---|---|---|---|---|
| March 10, 2026 | KRRO | Pre-Funded Warrants | Common Stock | $0.00 | · | 242,945 | Acquired |
| Feb. 9, 2026 | SGP | Series B Preferred Stock | Common Stock | · | · | 402,273 | Disposed |
| Feb. 9, 2026 | SGP | Series A Preferred Stock | Common Stock | · | · | 954,990 | Disposed |
| Feb. 9, 2026 | SGP | Series D Preferred Stock | Common Stock | · | · | 737,962 | Disposed |
| Feb. 9, 2026 | SGP | Series C-2 Preferred Stock | Common Stock | · | · | 1,370,168 | Disposed |
| Feb. 9, 2026 | SGP | Series C-1 Preferred Stock | Common Stock | · | · | 1,370,168 | Disposed |
| Feb. 9, 2026 | SGP | Series B Preferred Stock | Common Stock | · | · | 1,619,240 | Disposed |
| Sept. 16, 2024 | MBX | Series B Convertible Preferred Stock | Common Stock | · | · | 25,142,840 | Disposed |
| Sept. 16, 2024 | MBX | Series A Convertible Preferred Stock | Common Stock | · | · | 12,299,854 | Disposed |
| April 11, 2022 | TRVI | Pre-Funded Warrants | Common Stock | $0.00 | · | 3,000,000 | Acquired |
| Oct. 18, 2021 | TRVI | 7-Year Common Stock Warrant | Common Stock | $1.37 | Oct. 18, 2028 | 1,851,852 | Acquired |
| Oct. 18, 2021 | TRVI | 3.5-Year Common Stock Warrant | Common Stock | $1.37 | April 18, 2025 | 1,851,852 | Acquired |
| June 28, 2021 | GLUE | Series A-2 convertible preferred stock | Common Stock | · | · | 9,588,725 | Disposed |
| June 28, 2021 | GLUE | Series B convertible preferred stock | Common Stock | · | · | 11,500,000 | Disposed |
| June 28, 2021 | GLUE | Series C convertible preferred Stock | Common Stock | · | · | 2,361,912 | Disposed |
| April 3, 2020 | TRVI | Call Option (right to buy) | Common Stock | $0.00 | May 6, 2022 | 1,500,000 | Disposed |
| July 22, 2019 | MIRM | Series A Preferred Stock | Common Stock | · | · | 29,889,945 | Disposed |
| May 9, 2019 | TRVI | Series C Preferred Stock | Common Stock | · | · | 17,099,315 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 20 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Feb. 5, 2026 | SGP | Series B Preferred Stock | 1,619,240 | Indirect |
| Feb. 5, 2026 | SGP | Series C-1 Preferred Stock | 1,370,168 | Indirect |
| Feb. 5, 2026 | SGP | Series C-2 Preferred Stock | 1,370,168 | Indirect |
| Feb. 5, 2026 | SGP | Series D Preferred Stock | 737,962 | Indirect |
| Feb. 5, 2026 | SGP | Series A Preferred Stock | 954,990 | Indirect |
| Feb. 5, 2026 | SGP | Series B Preferred Stock | 402,273 | Indirect |
| Sept. 12, 2024 | MBX | Series A Convertible Preferred Stock | 1,023,103 | Indirect |
| Sept. 12, 2024 | MBX | Series B Convertible Preferred Stock | 2,091,383 | Indirect |
| Nov. 7, 2023 | KRRO | Common Stock | 1,072,936 | Indirect |
| June 23, 2021 | GLUE | Series A-2 convertible preferred stock | 2,715,968 | Indirect |
| June 23, 2021 | GLUE | Series B convertible preferred stock | 3,257,328 | Indirect |
| June 23, 2021 | GLUE | Series C convertible preferred stock | 669,002 | Indirect |
| March 16, 2021 | SVRA | Common Stock | 24,137,931 | Indirect |
| Jan. 29, 2020 | BDTX | Series B Preferred Stock | 2,176,957 | Indirect |
| Jan. 29, 2020 | BDTX | Series C Preferred Stock | 471,800 | Indirect |
| July 17, 2019 | MIRM | Series A Preferred Stock | · | Indirect |
| May 7, 2019 | TRVI | Series C Preferred Stock | 1,937,970 | Indirect |
| May 7, 2019 | TRVI | Stock Option (Right to Buy) | 1,500,000 | Indirect |
| Oct. 18, 2018 | MRKR | Common Stock | 5,000,000 | Indirect |
| Oct. 18, 2018 | MRKR | Warrant to Purchase Common Stock (right to buy) | 3,750,000 | Indirect |