David S. Grayzel
Insider
First SEC filing: March 27, 2024 · Latest: June 16, 2026
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net: $0
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 12, 2026 | QTTB | A | 10,826 | · | · | 10,826 Direct | · | Acquired | (price as of 2026-10-02) |
| June 12, 2026 | QTTB | A | 9,810 | · | · | 9,810 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 15, 2026 | QTTB | A | 16,363 | $2.75 | $44,998 | 16,363 Direct | · | Acquired | 199.3% (price as of 2026-10-02) |
| Oct. 23, 2025 | QTTB | A | 53,521 | · | · | 53,521 Direct | · | Acquired | (price as of 2026-10-02) |
| Feb. 24, 2025 | QTTB | A | 18,595 | · | · | 18,595 Direct | · | Acquired | (price as of 2026-10-02) |
| Feb. 24, 2025 | QTTB | D | 18,595 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Feb. 24, 2025 | QTTB | A | 2,569 | · | · | 2,569 Direct | · | Acquired | (price as of 2026-10-02) |
| Feb. 24, 2025 | QTTB | D | 2,569 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Feb. 24, 2025 | QTTB | A | 12,767 | · | · | 12,767 Direct | · | Acquired | (price as of 2026-10-02) |
| Feb. 24, 2025 | QTTB | D | 12,767 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Jan. 15, 2025 | QTTB | A | 18,595 | · | · | 18,595 Direct | · | Acquired | (price as of 2026-10-02) |
| June 5, 2024 | JBIO | A | 12,500 | · | · | 12,500 Direct | · | Acquired | (price as of 2026-10-02) |
| April 9, 2024 | JBIO | S | 11,882 | $28.15 | $334,478 | 14,502 Indirect | -45.03% | Disposed | -98.6% (price as of 2026-10-02) |
| April 1, 2024 | QTTB | A | 2,569 | $13.42 | $34,476 | 2,569 Direct | · | Acquired | -38.7% (price as of 2026-10-02) |
| March 25, 2024 | QTTB | A | 12,767 | · | · | 12,767 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 2, 2024 | JBIO | A | 3,186 | $13.49 | $42,979 | 3,186 Direct | · | Acquired | -97.0% (price as of 2026-10-02) |
| June 6, 2023 | JBIO | A | 12,500 | · | · | 12,500 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 3, 2023 | JBIO | A | 2,654 | $18.08 | $47,984 | 2,654 Direct | · | Acquired | -97.8% (price as of 2026-10-02) |
| June 21, 2022 | JBIO | A | 12,500 | · | · | 12,500 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 3, 2022 | JBIO | A | 7,317 | $6.56 | $48,000 | 7,317 Direct | · | Acquired | -93.9% (price as of 2026-10-02) |
| July 2, 2021 | JBIO | C | 7,976,754 | · | · | 0 Indirect | -100.00% | Disposed | (price as of 2026-10-02) |
| July 2, 2021 | JBIO | P | 535,714 | $14.00 | $7,499,996 | 3,103,879 Indirect | +20.86% | Acquired | -97.1% (price as of 2026-10-02) |
| July 2, 2021 | JBIO | C | 2,568,165 | · | · | 2,568,165 Indirect | · | Acquired | (price as of 2026-10-02) |
| July 1, 2021 | JBIO | A | 2,153 | $11.15 | $24,006 | 2,153 Direct | · | Acquired | -96.4% (price as of 2026-10-02) |
| June 29, 2021 | JBIO | A | 25,000 | · | · | 25,000 Direct | · | Acquired | (price as of 2026-10-02) |
| June 4, 2021 | JBIO | A | 6,102,052 | $1.89 | $11,532,878 | 7,976,754 Indirect | +325.49% | Acquired | -78.7% (price as of 2026-10-02) |
| Feb. 1, 2021 | JBIO | A | 878,981 | $1.89 | $1,661,274 | 1,874,702 Indirect | +88.28% | Acquired | -78.7% (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 12, 2026 | QTTB | Stock Option (Right to Buy) | Common Stock | $12.64 | June 11, 2036 | 10,826 | Acquired |
| June 12, 2026 | QTTB | Stock Option (Right to Buy) | Common Stock | $12.64 | June 11, 2036 | 9,810 | Acquired |
| Jan. 15, 2026 | QTTB | Stock Option (Right to Buy) | Common Stock | $3.60 | Jan. 14, 2036 | 16,363 | Acquired |
| Oct. 23, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock | $2.80 | Oct. 22, 2035 | 53,521 | Acquired |
| Feb. 24, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock | · | Jan. 14, 2035 | 18,595 | Acquired |
| Feb. 24, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock | $3.20 | Jan. 14, 2035 | 18,595 | Disposed |
| Feb. 24, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock | · | March 31, 2034 | 2,569 | Acquired |
| Feb. 24, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock | $18.00 | March 31, 2034 | 2,569 | Disposed |
| Feb. 24, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock | · | March 24, 2034 | 12,767 | Acquired |
| Feb. 24, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock | $16.82 | March 24, 2034 | 12,767 | Disposed |
| Jan. 15, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock | $3.20 | Jan. 14, 2035 | 18,595 | Acquired |
| June 5, 2024 | JBIO | Stock Option (Right to Buy) | Common Stock | $18.90 | June 4, 2034 | 12,500 | Acquired |
| April 1, 2024 | QTTB | Stock Option (Right to Buy) | Common Stock | $18.00 | March 31, 2034 | 2,569 | Acquired |
| March 25, 2024 | QTTB | Stock Option (Right to Buy) | Common Stock | $16.82 | March 24, 2034 | 12,767 | Acquired |
| Jan. 2, 2024 | JBIO | Stock Option (Right to Buy) | Common Stock | $21.81 | Jan. 1, 2034 | 3,186 | Acquired |
| June 6, 2023 | JBIO | Stock Option (Right to Buy) | Common Stock | $16.30 | June 5, 2033 | 12,500 | Acquired |
| Jan. 3, 2023 | JBIO | Stock Option (Right to Buy) | Common Stock | $27.03 | Jan. 2, 2033 | 2,654 | Acquired |
| June 21, 2022 | JBIO | Stock Option (Right to Buy) | Common Stock | $12.26 | June 20, 2032 | 12,500 | Acquired |
| Jan. 3, 2022 | JBIO | Stock Option (Right to Buy) | Common Stock | $10.93 | Jan. 2, 2032 | 7,317 | Acquired |
| July 2, 2021 | JBIO | Series A Preferred Stock | Common Stock | · | · | 7,976,754 | Disposed |
| July 1, 2021 | JBIO | Stock Option (Right to Buy) | Common Stock | $19.41 | June 30, 2031 | 2,153 | Acquired |
| June 29, 2021 | JBIO | Stock Option (Right to Buy) | Common Stock | $14.00 | June 28, 2031 | 25,000 | Acquired |
| June 4, 2021 | JBIO | Series A Preferred Stock | Common Stock | · | · | 6,102,052 | Acquired |
| Feb. 1, 2021 | JBIO | Series A Preferred Stock | Common Stock | · | · | 878,981 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 4 holdings
Securities held when first becoming an insider, per SEC Form 3.