Jeffrey D Keyser
Insider
First SEC filing: June 10, 2020 · Latest: June 10, 2020
Insider at
Insider transactions
2 buys (P)
0 sells (S)
Net: $100,001
Avg return of open purchases vs now: -53.7%
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 |
|---|---|---|---|---|---|---|---|---|---|
| May 12, 2026 | LTRN | P | 48,544 | $2.06 | $100,001 | 94,303 Direct | +106.09% | Acquired | -53.7% (price as of 2026-10-06) |
| May 12, 2026 | LTRN | P | 48,544 | · | · | 48,544 Direct | -50.00% | Disposed | (price as of 2026-10-06) |
| Jan. 9, 2026 | LTRN | A | 25,000 | · | · | 25,000 Direct | · | Acquired | (price as of 2026-10-06) |
| Jan. 9, 2026 | LTRN | A | 28,844 | · | · | 28,844 Direct | · | Acquired | (price as of 2026-10-06) |
| July 24, 2024 | LTRN | X | 3,832 | $3.13 | $11,994 | 0 Direct | · | Acquired | -69.5% (price as of 2026-10-06) |
| July 24, 2024 | LTRN | X | 3,832 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| July 15, 2024 | LTRN | A | 5,000 | · | · | 5,000 Direct | · | Acquired | (price as of 2026-10-06) |
| Nov. 4, 2021 | LTRN | D | 3,200 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| Nov. 4, 2021 | LTRN | A | 3,200 | · | · | 3,200 Direct | · | Acquired | (price as of 2026-10-06) |
| Nov. 4, 2021 | LTRN | A | 3,200 | · | · | 3,200 Direct | · | Acquired | (price as of 2026-10-06) |
| June 15, 2020 | LTRN | D | 9,135 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| June 15, 2020 | LTRN | A | 9,135 | · | · | 9,135 Direct | · | Acquired | (price as of 2026-10-06) |
| June 15, 2020 | LTRN | A | 9,135 | · | · | 9,135 Direct | · | Acquired | (price as of 2026-10-06) |
| June 15, 2020 | LTRN | C | 18,349 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| June 15, 2020 | LTRN | C | 31,927 | · | · | 41,927 Direct | +319.27% | Acquired | (price as of 2026-10-06) |
| June 11, 2020 | LTRN | P | 10,000 | $15.00 | $150,000 | 10,000 Direct | · | Acquired | -93.6% (price as of 2026-10-06) |
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 |
|---|---|---|---|---|---|---|---|
| May 12, 2026 | LTRN | Common stock purchase warrant (Right to Buy) | Common Stock | $2.27 | Nov. 13, 2031 | 48,544 | Disposed |
| Jan. 9, 2026 | LTRN | Stock Option (Right to Buy) | Common Stock | $3.49 | Jan. 8, 2036 | 25,000 | Acquired |
| Jan. 9, 2026 | LTRN | Stock Option (Right to Buy) | Common Stock | $3.49 | Jan. 8, 2036 | 28,844 | Acquired |
| July 24, 2024 | LTRN | Series A Warrants | Common Stock | $3.13 | July 25, 2024 | 3,832 | Disposed |
| July 15, 2024 | LTRN | Stock Option (Right to Buy) | Common Stock | $4.35 | July 15, 2034 | 5,000 | Acquired |
| Nov. 4, 2021 | LTRN | Stock Option (Right to Buy) | Common Stock | $10.32 | Nov. 3, 2031 | 3,200 | Disposed |
| Nov. 4, 2021 | LTRN | Stock Option (Right to Buy) | Common Stock | $5.04 | Nov. 3, 2031 | 3,200 | Acquired |
| Nov. 4, 2021 | LTRN | Stock Option (Right to Buy) | Common Stock | $10.32 | Nov. 4, 2031 | 3,200 | Acquired |
| June 15, 2020 | LTRN | Stock Option (Right to Buy) | Common Stock | $15.00 | June 14, 2030 | 9,135 | Disposed |
| June 15, 2020 | LTRN | Stock Option (Right to Buy) | Common Stock | $5.04 | June 14, 2030 | 9,135 | Acquired |
| June 15, 2020 | LTRN | Stock Option | Common Stock | · | · | 9,135 | Acquired |
| June 15, 2020 | LTRN | Series A Preferred Stock | Common Stock | · | · | 18,349 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 3 holdings
Securities held when first becoming an insider, per SEC Form 3.