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Who

Margaret Dillon

Director

Company insider

Files Form 4 as: Director, White Mountains Insurance Group; Director, Guidewire Software.

In numbers

Trades disclosed
18
Buys
1
Sells
0
Bought
$152K
Sold
$0
Companies
2
Companies where not an officer
2
First trade
6 Sep 2019
Last trade
21 May 2026
Last filed
22 May 2026

Companies traded

Everywhere else they filed: board seats, 10% stakes, other companies
WTM White Mountains Insurance GroupDirector · Insurance · last 21 May 20260 buys · 0 sells
GWRE Guidewire SoftwareDirector · Software · last 15 Dec 20251 buy · 0 sells

Activity over time

1 Nov 2024 – 1 Oct 2026
101Nov 24May 25Nov 25Apr 26Oct 26

Buys above the line, sells below, each month.

Every trade

TradedCompanyWhatAmount
21 May 2026filed 22 May 2026WTM White Mountains Insurance GroupInsuranceSEC FORM 4 Code A—135 at $0.00filing
21 May 2026filed 22 May 2026WTM White Mountains Insurance GroupInsuranceSEC FORM 4 Code A—135 at $0.00filing
15 Dec 2025filed 16 Dec 2025GWRE Guidewire SoftwareSoftwareSEC FORM 4 Code A—1,196 at $0.00filing
22 May 2025filed 23 May 2025WTM White Mountains Insurance GroupInsuranceSEC FORM 4 Code A—150 at $0.00filing
17 Dec 2024filed 17 Dec 2024GWRE Guidewire SoftwareSoftwareSEC FORM 4 Code A—1,211 at $0.00filing
23 May 2024filed 24 May 2024WTM White Mountains Insurance GroupInsuranceSEC FORM 4 Code A—165 at $0.00filing
19 Dec 2023filed 19 Dec 2023GWRE Guidewire SoftwareSoftwareSEC FORM 4 Code A—2,280 at $0.00filing
25 May 2023filed 26 May 2023WTM White Mountains Insurance GroupInsuranceSEC FORM 4 Code A—180 at $0.00filing
20 Dec 2022filed 20 Dec 2022GWRE Guidewire SoftwareSoftwareSEC FORM 4 Code A—3,736 at $0.00filing
26 May 2022filed 27 May 2022WTM White Mountains Insurance GroupInsuranceSEC FORM 4 Code A—225 at $0.00filing
14 Dec 2021filed 17 Dec 2021GWRE Guidewire SoftwareSoftwareSEC FORM 4 Code A—1,691 at $0.00filing
14 Dec 2021filed 15 Dec 2021GWRE Guidewire SoftwareSoftwareSEC FORM 4 Code A—1,691 at $0.00filing
27 May 2021filed 28 May 2021WTM White Mountains Insurance GroupInsuranceSEC FORM 4 Code A—225 at $0.00filing
15 Dec 2020filed 15 Dec 2020GWRE Guidewire SoftwareSoftwareSEC FORM 4 Code A—1,848 at $0.00filing
13 Mar 2020filed 16 Mar 2020GWRE Guidewire SoftwareSoftwareSEC FORM 4 Bought$152K2,000 at $75.97filing
17 Dec 2019filed 18 Dec 2019GWRE Guidewire SoftwareSoftwareSEC FORM 4 Code A—1,939 at $0.00filing
6 Sep 2019filed 14 Aug 2020GWRE Guidewire SoftwareSoftwareSEC FORM 4 Code A—492 at $0.00filing
6 Sep 2019filed 10 Sep 2019GWRE Guidewire SoftwareSoftwareSEC FORM 4 Code A—492 at $0.00filing

Sectors

Technology1

Buys in green, sells in red, by the company’s sector.

Related people

Michael George RosenbaumChief Executive Officer · Chief Executive Officer at Guidewire Software, filing Form 4 there in the last year
James Winston KingChief Admin Officer, Gen Couns · Chief Admin Officer, Gen Couns at Guidewire Software, filing Form 4 there in the last year
John P. MullenPresident · President at Guidewire Software, filing Form 4 there in the last year
Jeffrey Elliott CooperChief Financial Officer · Chief Financial Officer at Guidewire Software, filing Form 4 there in the last year
David Franklin PetersonChief Accounting Officer · Chief Accounting Officer at Guidewire Software, filing Form 4 there in the last year