Deep Track Biotechnology Master Fund, Ltd.
Ten-percent owner · LBRX, DVAX
As of 2026-09-16, Deep Track Biotechnology Master Fund, Ltd. has 35 Form 4 transactions on record across 2 companies — 23 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Reconstructed holdings
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-07-30 | LBRX | Purchase | 286,205 @ $34.94 | $10.0M | +75.6% of holding | 664,649 | Form 4 |
| 2026-02-06 | LBRX | Purchase | 378,444 @ $21.17 | $8.0M | ownership Δ n/a | 378,444 | Form 4 |
| 2026-02-06 | LBRX | Purchase | 93,925 @ $21.17 | $2.0M | ownership Δ n/a | 93,925 | Form 4 |
| 2025-09-12 | LBRX | Purchase | 2,000,000 @ $15.00 | $30.0M | +291.5% of holding | 2,686,138 | Form 4 |
| 2025-09-12 | LBRX | Purchase | 666,666 @ $15.00 | $10.0M | ownership Δ n/a | 666,666 | Form 4 |
| 2025-08-22 | DVAX | Sale | 970,143 @ $10.59 | $10.3M | −5.8% of holding | 15,726,349 | Form 4 |
| 2025-08-21 | DVAX | Sale | 1,094,994 @ $11.03 | $12.1M | −6.2% of holding | 16,696,492 | Form 4 |
28 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-08-06 | — | Conversion | 18,181,818 | — | Form 4 |
| 2026-08-06 | — | Conversion | 18,181,818 | — | Form 4 |
| 2026-08-06 | — | Conversion | 18,181,818 | — | Form 4 |
| 2026-08-06 | — | Conversion | 18,181,818 | — | Form 4 |
| 2026-08-06 | — | Conversion | 18,181,818 | — | Form 4 |
| 2026-08-06 | — | Conversion | 18,181,818 | — | Form 4 |
| 2026-08-06 | — | Conversion | 18,181,818 | — | Form 4 |
| 2026-08-06 | — | Conversion | 18,181,818 | — | Form 4 |
| 2026-08-06 | — | Conversion | 1,957,138 | 1,957,138 | Form 4 |
| 2026-08-06 | — | Conversion | 1,957,138 | 1,957,138 | Form 4 |
| 2026-08-06 | — | Conversion | 1,957,138 | 1,957,138 | Form 4 |
| 2026-08-06 | — | Conversion | 1,957,138 | 1,957,138 | Form 4 |
| 2026-08-06 | — | Conversion | 1,957,138 | 1,957,138 | Form 4 |
| 2026-08-06 | — | Conversion | 1,957,138 | 1,957,138 | Form 4 |
| 2026-08-06 | — | Conversion | 1,957,138 | 1,957,138 | Form 4 |
| 2026-08-06 | — | Conversion | 1,957,138 | 1,957,138 | Form 4 |
| 2026-02-10 | DVAX | Code U | 15,726,349 | 0 | Form 4 |
| 2026-02-10 | DVAX | Code U | 15,726,349 | 0 | Form 4 |
| 2026-02-10 | DVAX | Code U | 15,726,349 | 0 | Form 4 |
| 2026-02-10 | DVAX | Code U | 15,726,349 | 0 | Form 4 |
| 2025-09-12 | LBRX | Conversion | 686,138 | 686,138 | Form 4 |
| 2025-09-12 | LBRX | Conversion | 16,666,667 | 0 | Form 4 |
| 2025-09-12 | LBRX | Conversion | 686,138 | 686,138 | Form 4 |
| 2025-09-12 | LBRX | Conversion | 16,666,667 | 0 | Form 4 |
| 2025-09-12 | LBRX | Conversion | 686,138 | 686,138 | Form 4 |
| 2025-09-12 | LBRX | Conversion | 16,666,667 | 0 | Form 4 |
| 2025-09-12 | LBRX | Conversion | 686,138 | 686,138 | Form 4 |
| 2025-09-12 | LBRX | Conversion | 16,666,667 | 0 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.