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Deep Track Biotechnology Master Fund, Ltd.

CIK 2015536 · last filed 2026-08-03

Deep Track Biotechnology Master Fund, Ltd. is a corporate insider who has filed 4 SEC Form 4 insider transactions across 2 companies since 2025. The most recent filing, for LBRX, was dated Aug 3, 2026. Across all open-market trades the lifetime net is +$52.9M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $155.1M across reported positions. The firm reports its address in George Town, E9. 11 SEC filings were submitted jointly with Deep Track Capital, LP.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$155.07M

Companies

2

Total Filings

4

Lifetime Open-Market Net

$52.95M

Filer Profile

Reported Address
C/O WALKERS CORPORATE LIMITED
190 ELGIN AVE
GEORGE TOWN, E9 KY1-9001
Phone
(203) 409-0810
State of Incorporation
Cayman Islands
Related Filers
Deep Track Capital, LP — 11 joint filings, latest 2026-08-10
DAVID KROIN — 11 joint filings, latest 2026-08-10
Attovia Therapeutics, Inc. — 2 joint filings, latest 2026-08-10
Deep Track Special Opportunities Fund, LP — 1 joint filings, latest 2026-02-10
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
LBRX 10%+ Owner 3,352,804 $46.25 $155.07M $120.00M 2 2026-08-03
DYNAVAX TECHNOLOGIES CORP (DVAX) Delisted 10%+ Owner 0 $15.50 $0 -$67.05M 2 2026-02-11

Recent Filings

4 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-08-03 LBRX Buy (P) — $0 EDGAR
2026-02-11 DYNAVAX TECHNOLOGIES CORP (DVAX) Delisted U −47,179,047 $0 EDGAR
2025-09-16 LBRX Mixed +10,058,412 $120.00M EDGAR
2025-08-22 DYNAVAX TECHNOLOGIES CORP (DVAX) Delisted Sell (S) −6,195,411 -$67.05M EDGAR
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.