HORNSTRA PETER E

PrivateCIK: 1216071

Location

WALTHAM, MA

WEISLER DION J

→THERMO FISHER SCIENTIFIC INC.

Jun 30, 2026·Jun 30, 2026

1 txn

WEISLER DION J

→THERMO FISHER SCIENTIFIC INC.

Mar 31, 2026·Mar 31, 2026

1 txn

WILLIAMSON STEPHEN

144

→THERMO FISHER SCIENTIFIC INC.

Mar 3, 2026·Mar 3, 2026

+11

WILLIAMSON STEPHEN

→THERMO FISHER SCIENTIFIC INC.

Mar 2, 2026·Mar 2, 2026

3 txn

WILLIAMSON STEPHEN

→THERMO FISHER SCIENTIFIC INC.

Feb 27, 2026·Feb 27, 2026

2 txn

WEISLER DION J

→THERMO FISHER SCIENTIFIC INC.

Jan 5, 2026·Jan 5, 2026

1 txn

WILLIAMSON STEPHEN

→THERMO FISHER SCIENTIFIC INC.

Nov 17, 2025·Nov 17, 2025

2 txn

WEISLER DION J

→THERMO FISHER SCIENTIFIC INC.

Sep 30, 2025·Sep 30, 2025

1 txn

WILLIAMSON STEPHEN

→THERMO FISHER SCIENTIFIC INC.

Sep 2, 2025·Sep 2, 2025

5 txn

WEISLER DION J

→THERMO FISHER SCIENTIFIC INC.

Jul 1, 2025·Jul 1, 2025

1 txn

WEISLER DION J

→THERMO FISHER SCIENTIFIC INC.

May 22, 2025·May 22, 2025

2 txn

WEISLER DION J

→THERMO FISHER SCIENTIFIC INC.

Apr 1, 2025·Apr 1, 2025

1 txn

WILLIAMSON STEPHEN

→THERMO FISHER SCIENTIFIC INC.

Mar 4, 2025·Mar 4, 2025

3 txn

WILLIAMSON STEPHEN

→THERMO FISHER SCIENTIFIC INC.

Feb 21, 2025·Feb 21, 2025

4 txn

WILLIAMSON STEPHEN

→THERMO FISHER SCIENTIFIC INC.

Feb 5, 2025·Feb 5, 2025

7 txn

WILLIAMSON STEPHEN

144

→THERMO FISHER SCIENTIFIC INC.

Feb 4, 2025·Feb 4, 2025

-2

WILLIAMSON STEPHEN

144

→THERMO FISHER SCIENTIFIC INC.

Feb 3, 2025·Feb 3, 2025

WEISLER DION J

→THERMO FISHER SCIENTIFIC INC.

Jan 2, 2025·Jan 2, 2025

1 txn

WEISLER DION J

→THERMO FISHER SCIENTIFIC INC.

Oct 1, 2024·Oct 1, 2024

1 txn

WILLIAMSON STEPHEN

→THERMO FISHER SCIENTIFIC INC.

Aug 29, 2024·Aug 29, 2024

5 txn

WILLIAMSON STEPHEN

→THERMO FISHER SCIENTIFIC INC.

Aug 27, 2024·Aug 27, 2024

3 txn

WEISLER DION J

→THERMO FISHER SCIENTIFIC INC.

Jul 2, 2024·Jul 2, 2024

1 txn

WILLIAMSON STEPHEN

→THERMO FISHER SCIENTIFIC INC.

May 29, 2024·May 29, 2024

3 txn

WEISLER DION J

→THERMO FISHER SCIENTIFIC INC.

May 23, 2024·May 23, 2024

2 txn

WILLIAMSON STEPHEN

→THERMO FISHER SCIENTIFIC INC.

May 15, 2024·May 15, 2024

7 txn

Page 1 of 5 · 106 total

Filer	Form	Target	Filed	Activity
WEISLER DION JCIK · 1580693	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Jun 30, 2026 Jun 30, 2026	1txn
WEISLER DION JCIK · 1580693	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Mar 31, 2026 Mar 31, 2026	1txn
WILLIAMSON STEPHENCIK · 1648929	144 Sale	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Mar 3, 2026 Mar 3, 2026	—
WILLIAMSON STEPHENCIK · 1648929	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Mar 2, 2026 Mar 2, 2026	3txn
WILLIAMSON STEPHENCIK · 1648929	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Feb 27, 2026 Feb 27, 2026	2txn
WEISLER DION JCIK · 1580693	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Jan 5, 2026 Jan 5, 2026	1txn
WILLIAMSON STEPHENCIK · 1648929	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Nov 17, 2025 Nov 17, 2025	2txn
WEISLER DION JCIK · 1580693	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Sep 30, 2025 Sep 30, 2025	1txn
WILLIAMSON STEPHENCIK · 1648929	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Sep 2, 2025 Sep 2, 2025	5txn
WEISLER DION JCIK · 1580693	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Jul 1, 2025 Jul 1, 2025	1txn
WEISLER DION JCIK · 1580693	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	May 22, 2025 May 22, 2025	2txn
WEISLER DION JCIK · 1580693	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Apr 1, 2025 Apr 1, 2025	1txn
WILLIAMSON STEPHENCIK · 1648929	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Mar 4, 2025 Mar 4, 2025	3txn
WILLIAMSON STEPHENCIK · 1648929	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Feb 21, 2025 Feb 21, 2025	4txn
WILLIAMSON STEPHENCIK · 1648929	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Feb 5, 2025 Feb 5, 2025	7txn
WILLIAMSON STEPHENCIK · 1648929	144 Sale	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Feb 4, 2025 Feb 4, 2025	—
WILLIAMSON STEPHENCIK · 1648929	144 Sale	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Feb 3, 2025 Feb 3, 2025	—
WEISLER DION JCIK · 1580693	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Jan 2, 2025 Jan 2, 2025	1txn
WEISLER DION JCIK · 1580693	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Oct 1, 2024 Oct 1, 2024	1txn
WILLIAMSON STEPHENCIK · 1648929	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Aug 29, 2024 Aug 29, 2024	5txn
WILLIAMSON STEPHENCIK · 1648929	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Aug 27, 2024 Aug 27, 2024	3txn
WEISLER DION JCIK · 1580693	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	Jul 2, 2024 Jul 2, 2024	1txn
WILLIAMSON STEPHENCIK · 1648929	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	May 29, 2024 May 29, 2024	3txn
WEISLER DION JCIK · 1580693	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	May 23, 2024 May 23, 2024	2txn
WILLIAMSON STEPHENCIK · 1648929	4 Trade	THERMO FISHER SCIENTIFIC INC.CIK · 97745	May 15, 2024 May 15, 2024	7txn

Page 1 of 5 · 106 total