Quick Takeaways
- Margaret Dillon has 2 issuer positions tracked on this page.
- Estimated disclosed ownership value: $5,822,882.
- Recent insider filing activity is available below.
- Info
- Insider Ownership
Insider Trading & Ownership of Margaret Dillon
- Location
- San Mateo, CA
- Summary
- The estimated net worth of Margaret Dillon is at least $5,822,882 dollars as of 16 Dec 2025. Margaret Dillon is the Director of Guidewire Software, Inc. and owns shares of Guidewire Software, Inc. (GWRE) stock worth about $4.15M. Margaret Dillon is the Director of WHITE MOUNTAINS INSURANCE GROUP LTD and owns shares of WHITE MOUNTAINS INSURANCE GROUP LTD (WTM) stock worth about $1.67M.
- Signature
- By: Winston King, Attorney-in-Fact for Margaret Dillon
- All Insider Reports
- All Insider Reports
Follow Filing Activity
Follow Margaret Dillon and return when a new Insider Trading filing appears.
This tracks SEC filing changes for this page using existing product update flows.
What Changed
- Largest disclosed position: Guidewire Software, Inc. ($4,148,248).
- Past-year value change for that position: .
Why This Matters
- This page translates Forms 3/4/5 into a quick ownership context before you inspect each transaction row.
- You can cross-check role, issuer, and filing chronology directly against the SEC source.
Official SEC Source
Filed on Form 4
Insider ownership context is sourced from SEC Forms 3, 4, and 5.
See Original FilingOwnership of Margaret Dillon
| Symbol | Company | Relationship | Holdings Value | Past Year Net Change | Change % | Report Period |
|---|---|---|---|---|---|---|
| GWRE | Guidewire Software, Inc. | Director | $4,148,248 | 15 Dec 2025 | ||
| WTM | WHITE MOUNTAINS INSURANCE GROUP LTD | Director | $1,674,634 | 22 May 2025 |
Insider Transactions Reported by Margaret Dillon:
| Sym | Company | Class | Transaction | % | Value $ | * Price $ | Shares | Shares After | Date | Ownership |
|---|
* An asterisk sign (*) next to the price indicates that the price is likely invalid.