Edward T. Mathers
CIK 1328625 · View on SEC EDGAR ↗
Insider
Activist
First SEC filing: April 1, 2026 · Latest: June 8, 2026
On this page
Insider at
Insider transactions
3 buys (P)
0 sells (S)
Net:
$20,000,000
+ 69 non-open-market transactions below
Avg return of open purchases vs now:
37.3%
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
69 other filings hidden
| 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 | 21.6% (price as of 2026-08-20) |
| March 10, 2026 | KRRO | P | 207,100 | $11.11 | $2,300,881 | 1,297,893 Indirect | +18.99% | Acquired | 21.6% (price as of 2026-08-20) |
| Feb. 9, 2026 | SGP | P | 937,500 | $16.00 | $15,000,000 | 6,035,038 Indirect | +18.39% | Acquired | 68.8% (price as of 2026-08-20) |
| Sept. 16, 2024 | MBX | P | 500,000 | $16.00 | $8,000,000 | 3,614,486 Indirect | +16.05% | Acquired | 316.8% (price as of 2026-08-20) |
| April 22, 2024 | KRRO | P | 17,857 | $56.00 | $999,992 | 1,090,793 Indirect | +1.66% | Acquired | -75.9% (price as of 2026-08-20) |
| July 17, 2023 | SVRA | P | 333,333 | $3.00 | $999,999 | 24,471,264 Indirect | +1.38% | Acquired | 84.8% (price as of 2026-08-20) |
| June 28, 2021 | GLUE | P | 1,050,000 | $19.00 | $19,950,000 | 7,692,298 Indirect | +15.81% | Acquired | -20.3% (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 |
|---|---|---|---|---|---|---|---|
| Aug. 7, 2026 | OKUR | Stock Option (right to buy) | Class A Common Stock (22,350) | $4.14 | Aug. 6, 2036 | 22,350 | Acquired |
| June 4, 2026 | OKUR | Stock Option (right to buy) | Class A Common Stock (7,650) | $4.30 | June 3, 2036 | 7,650 | Acquired |
| June 4, 2026 | MBX | Stock option (right to buy) | Common Stock (12,500) | $30.91 | June 4, 2036 | 12,500 | Acquired |
| June 3, 2026 | TRVI | Nonstatutory Stock Option (right to buy) | Common Stock (35,000) | $13.45 | June 2, 2036 | 35,000 | Acquired |
| March 10, 2026 | KRRO | Pre-Funded Warrants | Common Stock (242,945) | $0.00 | — | 242,945 | Acquired |
| Feb. 9, 2026 | SGP | Series D Preferred Stock | Common Stock (737,962) | — | — | 737,962 | Disposed |
| Feb. 9, 2026 | SGP | Series C-2 Preferred Stock | Common Stock (1,370,168) | — | — | 1,370,168 | Disposed |
| Feb. 9, 2026 | SGP | Series C-1 Preferred Stock | Common Stock (1,370,168) | — | — | 1,370,168 | Disposed |
| Feb. 9, 2026 | SGP | Series B Preferred Stock | Common Stock (1,619,240) | — | — | 1,619,240 | Disposed |
| June 25, 2025 | SNTI | Stock Option (Right to Buy) | Common Stock (21,950) | $2.05 | June 24, 2035 | 21,950 | Acquired |
| June 24, 2025 | RYTM | Restricted Stock Units | Common Stock (4,712) | — | — | 4,712 | Acquired |
| June 24, 2025 | RYTM | Stock Option (right to buy) | Common Stock (7,037) | $63.66 | June 23, 2035 | 7,037 | Acquired |
| June 18, 2025 | RYTM | Restricted Stock Units | Common Stock (4,000) | — | — | 4,000 | Disposed |
| June 11, 2025 | TRVI | Nonstatutory Stock Option (right to buy) | Common Stock (45,000) | $6.25 | June 10, 2035 | 45,000 | Acquired |
| June 5, 2025 | MBX | Stock option (right to buy) | Common Stock (16,000) | $11.86 | June 5, 2035 | 16,000 | Acquired |
| May 28, 2025 | OKUR | Stock Option (right to buy) | Class A Common Stock (7,650) | $2.44 | May 27, 2035 | 7,650 | Acquired |
| March 7, 2025 | SNTI | Stock Option (Right to Buy) | Common Stock (43,900) | $3.52 | March 6, 2035 | 43,900 | Acquired |
| Oct. 4, 2024 | OKUR | Stock Option (right to buy) | Class A Common Stock (15,300) | $18.20 | Oct. 3, 2034 | 15,300 | Acquired |
| Sept. 16, 2024 | MBX | Series B Convertible Preferred Stock | Common Stock (2,091,383) | — | — | 25,142,840 | Disposed |
| Sept. 16, 2024 | MBX | Series A Convertible Preferred Stock | Common Stock (1,023,103) | — | — | 12,299,854 | Disposed |
| Sept. 12, 2024 | MBX | Stock Option (Right to Buy) | Common Stock (15,963) | $16.00 | Sept. 11, 2034 | 15,963 | Acquired |
| July 10, 2024 | SNTI | Stock Option (Right to Buy) | Common Stock (62,500) | $0.31 | July 9, 2034 | 62,500 | Acquired |
| June 21, 2024 | RYTM | Restricted Stock Units | Common Stock (3,000) | — | — | 3,000 | Disposed |
| June 18, 2024 | RYTM | Restricted Stock Units | Common Stock (4,000) | — | — | 4,000 | Acquired |
| June 18, 2024 | RYTM | Stock Option (right to buy) | Common Stock (14,000) | $41.39 | June 17, 2034 | 14,000 | Acquired |
| June 13, 2024 | TRVI | Nonstatutory Stock Option (right to buy) | Common Stock (30,000) | $2.77 | June 12, 2034 | 30,000 | Acquired |
| June 28, 2023 | TRVI | Nonstatutory Stock Option (right to buy) | Common Stock (30,000) | $2.27 | June 27, 2033 | 30,000 | Acquired |
| June 21, 2023 | RYTM | Restricted Stock Units | Common Stock (3,000) | — | — | 3,000 | Acquired |
| June 21, 2023 | RYTM | Stock Option (right to buy) | Common Stock (14,000) | $18.47 | June 20, 2033 | 14,000 | Acquired |
| June 16, 2023 | SNTI | Stock Option (Right to Buy) | Common Stock (62,500) | $0.99 | June 15, 2033 | 62,500 | Acquired |
| June 6, 2023 | OKUR | Stock Option (right to buy) | Common Stock (17,500) | $9.01 | June 5, 2033 | 17,500 | Disposed |
| July 13, 2022 | SNTI | Stock Option (Right to Buy) | Common Stock (125,000) | $1.75 | July 12, 2032 | 125,000 | Acquired |
| June 23, 2022 | TRVI | Nonstatutory Stock Option (right to buy) | Common Stock (20,000) | $2.27 | June 22, 2032 | 20,000 | Acquired |
| June 8, 2022 | RYTM | Stock Option (right to buy) | Common Stock (20,000) | $4.15 | June 7, 2032 | 20,000 | Acquired |
| June 2, 2022 | MIRM | Stock Option (right to buy) | Common Stock (17,000) | $23.51 | June 1, 2032 | 17,000 | Acquired |
| June 1, 2022 | OKUR | Stock Option (right to buy) | Common Stock (17,500) | $2.09 | May 31, 2032 | 17,500 | Acquired |
| April 11, 2022 | TRVI | Pre-Funded Warrants | Common Stock (3,000,000) | $0.00 | — | 3,000,000 | Acquired |
| June 28, 2021 | GLUE | Series A-2 convertible preferred stock | Common Stock (2,715,968) | — | — | 9,588,725 | Disposed |
| June 28, 2021 | GLUE | Series B convertible preferred stock | Common Stock (3,257,328) | — | — | 11,500,000 | Disposed |
| June 28, 2021 | GLUE | Series C convertible preferred Stock | Common Stock (669,002) | — | — | 2,361,912 | Disposed |
| June 16, 2021 | TRVI | Nonstatutory Stock Option (right to buy) | Common Stock (20,000) | $2.25 | June 15, 2031 | 20,000 | Acquired |
| June 9, 2021 | RYTM | Stock Option (right to buy) | Common Stock (15,000) | $18.99 | June 8, 2031 | 15,000 | Acquired |
| June 9, 2021 | RYTM | Stock Option (right to buy) | Common Stock (15,000) | $18.99 | June 8, 2031 | 15,000 | Acquired |
| June 4, 2021 | MIRM | Stock Option (right to buy) | Common Stock (17,000) | $16.88 | June 3, 2031 | 17,000 | Acquired |
| April 8, 2021 | OKUR | Stock Option (right to buy) | Common Stock (14,000) | $15.00 | April 7, 2031 | 14,000 | Acquired |
| June 17, 2020 | RYTM | Stock Option (right to buy) | Common Stock (18,500) | $21.37 | June 16, 2030 | 18,500 | Acquired |
| June 11, 2020 | TRVI | Nonstatutory Stock Option (right to buy) | Common Stock (14,210) | $4.10 | June 10, 2030 | 14,210 | Acquired |
| June 11, 2020 | MIRM | Stock Option (right to buy) | Common Stock (17,000) | $16.71 | June 10, 2030 | 17,000 | Acquired |
| June 19, 2019 | RYTM | Stock Option (right to buy) | Common Stock (15,000) | $22.93 | June 18, 2029 | 15,000 | Acquired |
| May 7, 2019 | TRVI | Stock Option (right to buy) | Common Stock (23,684) | $10.00 | May 6, 2029 | 23,684 | Acquired |
| June 6, 2018 | RYTM | Stock Option (right to buy) | Common Stock (10,000) | $34.89 | June 5, 2028 | 10,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 11 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→ Common Stock (1,619,240) | 1,619,240 | Indirect |
| Feb. 5, 2026 | SGP | Series C-1 Preferred Stock→ Common Stock (1,370,168) | 1,370,168 | Indirect |
| Feb. 5, 2026 | SGP | Series C-2 Preferred Stock→ Common Stock (1,370,168) | 1,370,168 | Indirect |
| Feb. 5, 2026 | SGP | Series D Preferred Stock→ Common Stock (737,962) | 737,962 | Indirect |
| Sept. 12, 2024 | MBX | Series A Convertible Preferred Stock→ Common Stock (1,023,103) | 1,023,103 | Indirect |
| Sept. 12, 2024 | MBX | Series B Convertible Preferred Stock→ Common Stock (2,091,383) | 2,091,383 | Indirect |
| Nov. 7, 2023 | KRRO | Common Stock | 1,072,936 | Indirect |
| June 23, 2021 | GLUE | Series A-2 convertible preferred stock→ Common Stock (2,715,968) | 2,715,968 | Indirect |
| June 23, 2021 | GLUE | Series B convertible preferred stock→ Common Stock (3,257,328) | 3,257,328 | Indirect |
| June 23, 2021 | GLUE | Series C convertible preferred stock→ Common Stock (669,002) | 669,002 | Indirect |
| March 16, 2021 | SVRA | Common Stock | 24,137,931 | Indirect |