Stephen Mayo
Insider
First SEC filing: March 17, 2021 · Latest: June 5, 2026
Insider at
Insider transactions
0 buys (P)
1 sells (S)
Net: $-123,208
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 |
|---|---|---|---|---|---|---|---|---|---|
| June 18, 2026 | ALLO | A | 144,400 | · | · | 144,400 Direct | · | Acquired | (price as of 2026-10-02) |
| June 4, 2026 | SRPT | A | 16,875 | · | · | 18,640 Direct | +956.09% | Acquired | (price as of 2026-10-02) |
| May 29, 2026 | MRK | A | 1,853 | $118.72 | $219,988 | 14,825 Direct | +14.28% | Acquired | 21.5% (price as of 2026-10-02) |
| March 12, 2026 | SRPT | S | 7,239 | $17.02 | $123,208 | 1,765 Direct | -80.40% | Disposed | 2.8% (price as of 2026-10-02) |
| June 18, 2025 | ALLO | A | 95,400 | · | · | 95,400 Direct | · | Acquired | (price as of 2026-10-02) |
| May 30, 2025 | MRK | A | 2,863 | $76.84 | $219,993 | 12,540 Direct | +29.59% | Acquired | 87.8% (price as of 2026-10-02) |
| March 10, 2025 | SRPT | A | 4,792 | · | · | 4,792 Direct | · | Acquired | (price as of 2026-10-02) |
| March 10, 2025 | SRPT | A | 2,383 | · | · | 9,004 Direct | +35.99% | Acquired | (price as of 2026-10-02) |
| June 5, 2024 | ALLO | A | 191,082 | · | · | 191,082 Direct | · | Acquired | (price as of 2026-10-02) |
| May 31, 2024 | MRK | A | 1,752 | $125.54 | $219,946 | 9,380 Direct | +22.97% | Acquired | 14.9% (price as of 2026-10-02) |
| March 5, 2024 | SRPT | S | 3,135 | $122.96 | $385,480 | 6,621 Direct | -32.13% | Disposed | -85.8% (price as of 2026-10-02) |
| March 1, 2024 | SRPT | A | 3,679 | · | · | 3,679 Direct | · | Acquired | (price as of 2026-10-02) |
| March 1, 2024 | SRPT | A | 1,846 | · | · | 9,756 Direct | +23.34% | Acquired | (price as of 2026-10-02) |
| Aug. 7, 2023 | ALLO | S | 10,000 | $4.29 | $42,900 | 25,328 Direct | -28.31% | Disposed | -65.0% (price as of 2026-10-02) |
| June 13, 2023 | ALLO | A | 116,120 | · | · | 116,120 Direct | · | Acquired | (price as of 2026-10-02) |
| May 26, 2023 | MRK | A | 1,981 | $111.07 | $220,030 | 7,430 Direct | +36.36% | Acquired | 29.9% (price as of 2026-10-02) |
| March 6, 2023 | SRPT | A | 3,257 | · | · | 3,257 Direct | · | Acquired | (price as of 2026-10-02) |
| March 6, 2023 | SRPT | A | 1,523 | · | · | 7,910 Direct | +23.85% | Acquired | (price as of 2026-10-02) |
| Nov. 17, 2022 | SRPT | S | 858 | $109.92 | $94,311 | 6,387 Direct | -11.84% | Disposed | -84.1% (price as of 2026-10-02) |
| July 8, 2022 | ALLO | A | 35,328 | · | · | 35,328 Direct | · | Acquired | (price as of 2026-10-02) |
| July 8, 2022 | ALLO | A | 54,487 | · | · | 54,487 Direct | · | Acquired | (price as of 2026-10-02) |
| May 27, 2022 | MRK | A | 2,364 | $93.08 | $220,041 | 5,298 Direct | +80.57% | Acquired | 55.0% (price as of 2026-10-02) |
| March 7, 2022 | SRPT | A | 5,077 | · | · | 5,077 Direct | · | Acquired | (price as of 2026-10-02) |
| March 7, 2022 | SRPT | A | 2,953 | · | · | 7,245 Direct | +68.80% | Acquired | (price as of 2026-10-02) |
| Nov. 16, 2021 | SRPT | A | 8,238 | · | · | 8,238 Direct | · | Acquired | (price as of 2026-10-02) |
| Nov. 16, 2021 | SRPT | A | 4,292 | · | · | 4,292 Direct | · | Acquired | (price as of 2026-10-02) |
| May 28, 2021 | MRK | A | 2,635 | $75.89 | $199,970 | 2,755 Direct | +2195.83% | Acquired | 99.3% (price as of 2026-10-02) |
| March 15, 2021 | MRK | A | 120 | $76.23 | $9,148 | 120 Direct | · | Acquired | 98.4% (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 |
|---|---|---|---|---|---|---|---|
| June 18, 2026 | ALLO | Stock Option (Right to buy) | Common Stock | $2.00 | June 18, 2036 | 144,400 | Acquired |
| May 29, 2026 | MRK | Phantom Stock | Common Stock | · | · | 1,853 | Acquired |
| June 18, 2025 | ALLO | Restricted Stock Unit | Common Stock | · | · | 95,400 | Acquired |
| May 30, 2025 | MRK | Phantom Stock | Common Stock | · | · | 2,863 | Acquired |
| March 10, 2025 | SRPT | Stock Options (right to buy) | Common Stock | $99.69 | March 10, 2035 | 4,792 | Acquired |
| June 5, 2024 | ALLO | Stock Option (Right to buy) | Common Stock | $2.44 | June 5, 2034 | 191,082 | Acquired |
| May 31, 2024 | MRK | Phantom Stock | Common Stock | · | · | 1,752 | Acquired |
| March 1, 2024 | SRPT | Stock Option (right to buy) | Common Stock | $128.67 | March 1, 2034 | 3,679 | Acquired |
| June 13, 2023 | ALLO | Stock Option (Right to Buy) | Common Stock | $5.70 | June 13, 2033 | 116,120 | Acquired |
| May 26, 2023 | MRK | Phantom Stock | Common Stock | · | · | 1,981 | Acquired |
| March 6, 2023 | SRPT | Stock Option (right to buy) | Common Stock | $155.99 | March 6, 2033 | 3,257 | Acquired |
| July 8, 2022 | ALLO | Stock Option (Right to Buy) | Common Stock | $12.03 | July 8, 2032 | 54,487 | Acquired |
| May 27, 2022 | MRK | Phantom Stock | Common Stock | · | · | 2,364 | Acquired |
| March 7, 2022 | SRPT | Stock Option (right to buy) | Common Stock | $80.42 | March 7, 2032 | 5,077 | Acquired |
| Nov. 16, 2021 | SRPT | Stock Option (right to buy) | Common Stock | $83.00 | Nov. 16, 2031 | 8,238 | Acquired |
| May 28, 2021 | MRK | Phantom Stock | Common Stock | · | · | 2,635 | Acquired |
| March 15, 2021 | MRK | Phantom Stock | Common Stock | · | · | 120 | 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 |
|---|---|---|---|---|
| March 17, 2021 | MRK | Common Stock | 100 | Direct |