David S. Grayzel
CIK 1732786 · View on SEC EDGAR ↗
Insider
First SEC filing: March 27, 2024 · Latest: June 16, 2026
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 19 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
19 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| July 2, 2021 | JBIO | P | 535,714 | $14.00 | $7,499,996 | 3,103,879 Indirect | +20.86% | Acquired | -95.3% (price as of 2026-08-19) |
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 (9,810) | $12.64 | June 11, 2036 | 9,810 | Acquired |
| Jan. 15, 2026 | QTTB | Stock Option (Right to Buy) | Common Stock (16,363) | $3.60 | Jan. 14, 2036 | 16,363 | Acquired |
| Oct. 23, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock (53,521) | $2.80 | Oct. 22, 2035 | 53,521 | Acquired |
| Feb. 24, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock (18,595) | — | Jan. 14, 2035 | 18,595 | Acquired |
| Feb. 24, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock (18,595) | $3.20 | Jan. 14, 2035 | 18,595 | Disposed |
| Feb. 24, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock (2,569) | — | March 31, 2034 | 2,569 | Acquired |
| Feb. 24, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock (2,569) | $18.00 | March 31, 2034 | 2,569 | Disposed |
| Feb. 24, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock (12,767) | — | March 24, 2034 | 12,767 | Acquired |
| Feb. 24, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock (12,767) | $16.82 | March 24, 2034 | 12,767 | Disposed |
| Jan. 15, 2025 | QTTB | Stock Option (Right to Buy) | Common Stock (18,595) | $3.20 | Jan. 14, 2035 | 18,595 | Acquired |
| April 1, 2024 | QTTB | Stock Option (Right to Buy) | Common Stock (2,569) | $18.00 | March 31, 2034 | 2,569 | Acquired |
| March 25, 2024 | QTTB | Stock Option (Right to Buy) | Common Stock (12,767) | $16.82 | March 24, 2034 | 12,767 | Acquired |
| July 2, 2021 | JBIO | Series A Preferred Stock | Common Stock (2,568,165) | — | — | 7,976,754 | Disposed |
| July 1, 2021 | JBIO | Stock Option (Right to Buy) | Common Stock (2,153) | $19.41 | June 30, 2031 | 2,153 | Acquired |
| June 29, 2021 | JBIO | Stock Option (Right to Buy) | Common Stock (25,000) | $14.00 | June 28, 2031 | 25,000 | Acquired |
| June 4, 2021 | JBIO | Series A Preferred Stock | Common Stock (1,964,594) | — | — | 6,102,052 | Acquired |
| Feb. 1, 2021 | JBIO | Series A Preferred Stock | Common Stock (282,993) | — | — | 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.