Guidewire Software, Inc. (GWRE) Shareholders & Insider Trades
Guidewire Software shareholders at a glance
The largest holder of Guidewire Software stock is BAMCO, Inc., with 9.0 million shares (10.80% of the company), worth about $1.84 billion as of September 25, 2026. The 10 largest holders together own 54.5%.
In Q2 2026, 582 institutional holdings reports listed shares worth $10.50 billion.
Insiders reported 50 transactions in the last two years: 40 sales worth $32.56 million and no purchases. The newest one on file is from November 10, 2025 (Rosenbaum Michael George, Chief Executive Officer).
Major holders as of September 25, 2026; quarterly totals from institutional holdings reports (latest Q2 2026); insider transactions on file through November 10, 2025.
Guidewire Software, Inc.
Shareholders Summary
2026Q2
Ownership by Type
Geographic Distribution
Largest Guidewire Software shareholders
| Holder | Shares | % of company | Value |
|---|---|---|---|
| BAMCO, Inc. | 9.0 million | 10.80% | $1.8B |
| BlackRock Advisors LLC | 8.4 million | 10.15% | $1.7B |
| The Linonia Partnership LP | 6.9 million | 8.33% | $1.4B |
| Vanguard Portfolio Management LLC | 4.5 million | 5.41% | $923.0M |
| Vanguard Capital Management LLC | 3.8 million | 4.62% | $787.0M |
| Darsana Capital Partners LP | 3.8 million | 4.57% | $779.0M |
| State Street Corporation | 2.7 million | 3.22% | $549.0M |
| JPMorgan Investment Management, Inc. | 2.2 million | 2.70% | $461.0M |
| MFS Investment Management Canada Ltd. | 2.0 million | 2.44% | $415.0M |
| Route One Investment Co. LP | 1.8 million | 2.22% | $379.0M |
As of September 25, 2026.
Guidewire Software institutional holdings by quarter
| Quarter | Reports | Shares | Value |
|---|---|---|---|
| Q2 2026 | 582 | – | $10.5B |
| Q1 2026 | 625 | 85.8 million | $12.8B |
| Q4 2025 | 696 | 83.3 million | $16.7B |
| Q3 2025 | 722 | 84.8 million | $19.3B |
| Q2 2025 | 708 | 84.9 million | $19.8B |
| Q1 2025 | 626 | 109.0 million | $16.1B |
| Q4 2024 | 595 | 83.7 million | $14.0B |
| Q3 2024 | 529 | 85.4 million | $15.6B |
Shares and value held by institutions that file quarterly holdings reports (options not included).
Guidewire Software insider trades
| Insider | Date | Title | Transaction | Value |
|---|---|---|---|---|
| Rosenbaum Michael George | Nov 10, 2025 | Chief Executive Officer | Sale at price 218.53 per share. | $305,942 |
| Rosenbaum Michael George | Nov 3, 2025 | Chief Executive Officer | Sale at price 231.85 per share. | $324,590 |
| Mullen John P | Nov 3, 2025 | President | Sale at price 231.85 per share. | $695,550 |
| Rosenbaum Michael George | Oct 27, 2025 | Chief Executive Officer | Sale at price 255.40 per share. | $357,560 |
| King James Winston | Oct 20, 2025 | General Counsel | Sale at price 245.70 per share. | $196,069 |
| Rosenbaum Michael George | Oct 20, 2025 | Chief Executive Officer | Sale at price 245.70 per share. | $343,980 |
| Rosenbaum Michael George | Oct 13, 2025 | Chief Executive Officer | Sale at price 239.71 per share. | $335,594 |
| Rosenbaum Michael George | Oct 6, 2025 | Chief Executive Officer | Sale at price 230.08 per share. | $322,112 |
| Mullen John P | Oct 1, 2025 | President | Sale at price 230.73 per share. | $692,190 |
| Bauer David S. | Oct 1, 2025 | Director | Sale at price 230.73 per share. | $115,365 |
| Rosenbaum Michael George | Sep 29, 2025 | Chief Executive Officer | Sale at price 232.25 per share. | $325,150 |
| Rosenbaum Michael George | Sep 22, 2025 | Chief Executive Officer | Sale at price 244.55 per share. | $342,370 |
Newest 12 of 50 insider transactions in the last two years.
Questions and answers
Who owns the most Guidewire Software stock?
BAMCO, Inc., with 10.80% of the company (as of September 25, 2026). Next: BlackRock Advisors LLC (10.15%) and The Linonia Partnership LP (8.33%).
How many institutions own Guidewire Software stock?
582 institutional holdings reports listed Guidewire Software shares in Q2 2026 worth $10.50 billion.
Are Guidewire Software insiders buying or selling the stock?
In the last two years insiders reported 40 sales and no purchases (50 transactions in all); the newest on file is from November 10, 2025.
