Arkolith/Insider Trading/GTHP

GTHP Insider Trading

GTHP · full profile →Last filing Feb 27, 2026
Mixed · 180d
Open-Market Buys (180d)
$0
0 insiders
Open-Market Sells (180d)
$0
0 insiders
Net Insider Flow
$0
open market, 180d
Reporting Insiders
0
0 P/S transactions
Build

Build on these Form 4 transactions

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Recent Form 4 Transactions

100 shown
DateInsiderRoleActionSharesPriceValue
Feb 27, 2026Imhoff John EDirector, 10% OwnerConversion(C)156K$0.07$11K
Feb 27, 2026Imhoff John EDirector, 10% OwnerOther(J)400K——
Feb 27, 2026Imhoff John EDirector, 10% OwnerOther(J)100——
Feb 27, 2026Imhoff John EDirector, 10% OwnerConversion(C)156K$0.07$11K
Feb 25, 2026James Michael CDirectorOption exercise(X)100K——
Feb 25, 2026James Michael CDirectorOption exercise(X)100K——
Feb 25, 2026James Michael CDirectorOther(J)100K——
Feb 25, 2026James Michael CDirectorOther(J)100K——
Feb 25, 2026James Michael CDirectorOther(J)100K——
Feb 25, 2026James Michael CDirectorOther(J)100K——
Feb 25, 2026Imhoff John EDirector, 10% OwnerOption exercise(X)500K——
Feb 25, 2026Imhoff John EDirector, 10% OwnerOption exercise(X)500K——
Feb 25, 2026Imhoff John EDirector, 10% OwnerOther(J)500K——
Feb 25, 2026Imhoff John EDirector, 10% OwnerOther(J)500K——
Feb 25, 2026Imhoff John EDirector, 10% OwnerOther(J)500K——
Feb 25, 2026Imhoff John EDirector, 10% OwnerOther(J)500K——
Feb 2, 2026Imhoff John EDirector, 10% OwnerConversion(C)313K$0.07$22K
Feb 2, 2026Imhoff John EDirector, 10% OwnerConversion(C)313K——
Jan 5, 2026Imhoff John EDirector, 10% OwnerOther(J)25K——
Dec 18, 2025Imhoff John EDirector, 10% OwnerConversion(C)195K$0.07$14K
Dec 18, 2025Imhoff John EDirector, 10% OwnerConversion(C)195K——
Aug 29, 2025James Michael CDirectorBuy(P)28K$0.18$5K
Aug 29, 2025James Michael CDirectorBuy(P)28K——
Aug 29, 2025Imhoff John EDirector, 10% OwnerBuy(P)167K$0.18$30K
Aug 29, 2025Imhoff John EDirector, 10% OwnerBuy(P)167K——
Aug 29, 2025Grujic AlanDirectorBuy(P)152K——
Aug 29, 2025Grujic AlanDirectorBuy(P)152K——
Aug 21, 2025Blumberg Richard P.Director, 10% OwnerOther(J)81K——
Aug 21, 2025Blumberg Richard P.Director, 10% OwnerOther(J)233——
Aug 21, 2025Blumberg Richard P.Director, 10% OwnerOther(J)932K——
Aug 21, 2025Imhoff John EDirector, 10% OwnerOther(J)1.2M——
Aug 21, 2025Imhoff John EDirector, 10% OwnerOther(J)104K——
Aug 21, 2025Imhoff John EDirector, 10% OwnerOther(J)300——
Aug 21, 2025Grujic AlanDirectorOther(J)50——
Aug 21, 2025Grujic AlanDirectorOther(J)17K——
Aug 21, 2025Grujic AlanDirectorOther(J)200K——
Jun 3, 2025Blumberg Richard P.Director, 10% OwnerGrant(A)110K—$0
Jun 3, 2025Imhoff John EDirectorGrant(A)110K—$0
Jun 3, 2025Grujic AlanDirectorGrant(A)110K—$0
Jun 3, 2025James Michael CDirectorGrant(A)110K—$0
Apr 10, 2025Blumberg Richard P.Director, 10% OwnerOther(J)165K——
Apr 10, 2025Blumberg Richard P.Director, 10% OwnerOther(J)56K——
Apr 10, 2025Imhoff John EDirector, 10% OwnerOther(J)6K——
Mar 18, 2025James Michael CDirectorBuy(P)263K$0.10$26K
Mar 18, 2025James Michael CDirectorBuy(P)150K$0.10$15K
Mar 18, 2025James Michael CDirectorBuy(P)263K——
Mar 18, 2025James Michael CDirectorBuy(P)150K——
Mar 18, 2025Imhoff John EDirector, 10% OwnerBuy(P)263K$0.10$26K
Mar 18, 2025Imhoff John EDirector, 10% OwnerBuy(P)1.0M$0.10$100K
Mar 18, 2025Imhoff John EDirector, 10% OwnerBuy(P)1.0M——
Mar 18, 2025Imhoff John EDirector, 10% OwnerBuy(P)263K——
Mar 13, 2025Imhoff John EDirector, 10% OwnerBuy(P)150——
Mar 11, 2025Imhoff John EDirector, 10% OwnerOther(J)2.3M$0.13$294K
Mar 11, 2025Imhoff John EDirector, 10% OwnerOther(J)286——
Mar 7, 2025Imhoff John EDirector, 10% OwnerBuy(P)286——
Mar 6, 2025Imhoff John EDirector, 10% OwnerOther(J)900K——
Mar 6, 2025Imhoff John EDirector, 10% OwnerOther(J)300——
Mar 6, 2025Imhoff John EDirector, 10% OwnerOther(J)2K——
Mar 6, 2025Imhoff John EDirector, 10% OwnerOther(J)4.8M$0.50$2.4M
Jan 17, 2025Imhoff John E10% OwnerOther(J)35K——
Dec 18, 2024Imhoff John EDirector, 10% OwnerBuy(P)1.6M——
Dec 18, 2024Imhoff John EDirector, 10% OwnerBuy(P)1.6M——
Oct 15, 2024Imhoff John EDirector, 10% OwnerOther(J)36K——
Oct 14, 2024Blumberg Richard P.Director, 10% OwnerOther(J)400K——
Sep 23, 2024Imhoff John EDirector, 10% OwnerBuy(P)1.7M——
Sep 23, 2024Imhoff John EDirector, 10% OwnerBuy(P)1.7M——
Sep 2, 2024Grujic AlanDirectorOther(J)800K——
Sep 1, 2024Blumberg Richard P.Director, 10% OwnerOther(J)900K——
Aug 21, 2024Blumberg Richard P.DirectorOther(J)171K——
Aug 21, 2024Imhoff John EDirectorOther(J)183K——
Aug 21, 2024Grujic AlanDirectorOther(J)37K——
Aug 2, 2024James Michael CDirectorOther(J)25K——
Jul 31, 2024Grujic AlanDirectorOther(J)25K——
Jul 31, 2024Imhoff John EDirector, 10% OwnerOther(J)25K——
Jul 15, 2024Imhoff John EDirector, 10% OwnerOther(J)48K——
Jul 9, 2024Grujic AlanDirectorGrant(A)100K—$0
Jul 9, 2024Blumberg Richard P.Director, 10% OwnerGrant(A)100K—$0
Jul 9, 2024Imhoff John EDirector, 10% OwnerGrant(A)100K—$0
Jul 9, 2024James Michael CDirectorGrant(A)100K—$0
Apr 5, 2024Imhoff John EDirector, 10% OwnerOther(J)49K——
Mar 26, 2024Blumberg Richard P.Director, 10% OwnerOther(J)39K——
Mar 26, 2024Blumberg Richard P.Director, 10% OwnerOther(J)115K——
Mar 26, 2024Imhoff John EDirector, 10% OwnerOther(J)4K——
Mar 1, 2024Blumberg Richard P.Director, 10% OwnerOther(J)400K——
Mar 1, 2024Blumberg Richard P.Director, 10% OwnerOther(J)900K——
Jan 16, 2024Imhoff John E10% OwnerOther(J)37K——
Dec 1, 2023Blumberg Richard P.Director, 10% OwnerOption exercise(X)1.6M——
Dec 1, 2023Blumberg Richard P.Director, 10% OwnerOption exercise(X)1.6M——
Nov 16, 2023Blumberg Richard P.Director, 10% OwnerOther(J)875K——
Nov 16, 2023Blumberg Richard P.Director, 10% OwnerOther(J)1.6M——
Nov 16, 2023Blumberg Richard P.Director, 10% OwnerOther(J)950K——
Oct 16, 2023Imhoff John E10% OwnerOther(J)37K——
Sep 1, 2023Blumberg Richard P.Director, 10% OwnerOther(J)400K——
Sep 1, 2023Blumberg Richard P.Director, 10% OwnerOther(J)900K——
Aug 21, 2023Imhoff John EDirector, 10% OwnerOther(J)113K——
Aug 21, 2023Grujic AlanDirectorOther(J)23K——
Aug 21, 2023Blumberg Richard P.Director, 10% OwnerOther(J)105K——
Aug 11, 2023Imhoff John EDirector, 10% OwnerBuy(P)501K——
Aug 11, 2023Imhoff John EDirector, 10% OwnerBuy(P)250——
Jul 17, 2023Imhoff John EDirector, 10% OwnerOther(J)26K——

Data Source

Insider transactions sourced from SEC EDGAR Form 4 filings, normalized within minutes of acceptance. "Buy"/"Sell" mark open-market transactions (codes P/S), the tradeable signal. Awards, option exercises and tax-withholding are shown with their raw code. All data is public domain.

Coverage: Form 4 filings indexed 2021-03-29 → 2026-07-14. Earlier history is backfilling; this window widens as it deepens.

Programmatic access via the Arkolith API & MCP server (insider.transactions, insider.company).