As of November 6, 2026, 5 holders' latest Schedule 13D or 13G filings report owning 5% or more of Guidewire Software, Inc. The largest reported stake is Baron Capital Group, Inc.'s, at 10.8%. 11 filings are on record since July 2, 2025 (Schedule 13G/A, July 2, 2026).
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Key facts
- · Reporting person: Bamco Inc · Sole voting: 0 · Shared voting: 7,922,989 · Sole dispositive: 0 · Shared dispositive: 8,012,383 · SCHEDULE 13G/A, 2026-07-02
- · Reporting person: Linonia Partners Fund LP · Sole voting: 0 · Shared voting: 7,651,130 · Sole dispositive: 0 · Shared dispositive: 7,651,130 · SCHEDULE 13G/A, 2026-05-15
- · Holder: Baron Capital Group, Inc. · Percent: 7.79% · SCHEDULE 13G/A
- · Reporting person: Massachusetts Financial Services Company · Sole voting: 2,872,289 · Shared voting: 0 · Sole dispositive: 2,995,337 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-05-14
- · Holder: Vanguard Capital Management · Percent: 5.3% · SCHEDULE 13G
Guidewire Software, Inc. has 11 Schedule 13D or 13G filings on record since 2025-07-02. 5 holders' latest filing reports 5% or more of common stock, $0.0001 par value. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Baron Capital Group, Inc. | 10.8% | 8,987,623 | SCHEDULE 13G/A, 2026-07-02 | 2026-06-30 |
| BlackRock, Inc. | 10.2% | 8,602,251 | SCHEDULE 13G/A, 2025-07-02 | 2025-06-30 |
| Linonia Partners Fund LP | 9% | 7,651,130 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| Vanguard Portfolio Management | 5.45% | 4,616,869 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| Vanguard Capital Management | 5.3% | 4,492,568 | SCHEDULE 13G, 2026-04-30 | 2026-03-31 |
| Massachusetts Financial Services Company | 3.5% | 2,995,337 | SCHEDULE 13G/A, 2026-05-14 | 2026-03-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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More on Guidewire Software, Inc. and the records around it.
Guidewire Software, Inc. elsewhere on the record
- Leadership changes Sep 2026
- Who owns it
Companies that share a holder
- Linonia Partners Fund LP also filed stake reports on 3 other companies: Liberty Live Holdings, Inc. (Sep 2026), The New York Times Company (Aug 2026), Liberty Media Corporation (Oct 2025)
- BAMCO INC /NY/ also filed stake reports on 22 other companies: Birkenstock Holding plc (Aug 2026), Blackstone Digital Infrastructure Trust Inc. (Aug 2026), CAREDX, INC. (Aug 2026)
- Massachusetts Financial Services Company also filed stake reports on 26 other companies: ASHLAND INC. (Aug 2026), BLACKSTONE DIGITAL INFRASTRUCTURE TRUST INC (Aug 2026), PG&E CORP (Aug 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Bamco Inc | 0 | 7,922,989 | 0 | 8,012,383 | SCHEDULE 13G/A, 2026-07-02 |
| Baron Capital Group, Inc. | 0 | 8,898,229 | 0 | 8,987,623 | SCHEDULE 13G/A, 2026-07-02 |
| Baron Capital Management, Inc. | 0 | 975,240 | 0 | 975,240 | SCHEDULE 13G/A, 2026-07-02 |
| Ronald Baron | 0 | 8,898,229 | 0 | 8,987,623 | SCHEDULE 13G/A, 2026-07-02 |
| Linonia Partners Fund LP | 0 | 7,651,130 | 0 | 7,651,130 | SCHEDULE 13G/A, 2026-05-15 |
| The Linonia Partnership LP | 0 | 7,651,130 | 0 | 7,651,130 | SCHEDULE 13G/A, 2026-05-15 |
| The Linonia Partnership GP LLC | 0 | 7,651,130 | 0 | 7,651,130 | SCHEDULE 13G/A, 2026-05-15 |
| Philip Uhde | 0 | 7,651,130 | 0 | 7,651,130 | SCHEDULE 13G/A, 2026-05-15 |
| Massachusetts Financial Services Company | 2,872,289 | 0 | 2,995,337 | 0 | SCHEDULE 13G/A, 2026-05-14 |
The latest filing identifies Guidewire Software, Inc. by CUSIP 40171V100 and gives its principal executive office as 970 Park Pl, Suite 200, San Mateo, CA 94403 (SCHEDULE 13G/A, 2026-07-02).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-02 | BlackRock, Inc. | 10.2% | SCHEDULE 13G/A |
| 2025-09-29 | Linonia Partners Fund LP | 5% | SCHEDULE 13G |
| 2026-02-17 | Baron Capital Group, Inc. | 6.05% | SCHEDULE 13G/A |
| 2026-02-17 | Linonia Partners Fund LP | 6.3% | SCHEDULE 13G/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Portfolio Management | 5.45% | SCHEDULE 13G |
| 2026-04-30 | Vanguard Capital Management | 5.3% | SCHEDULE 13G |
| 2026-05-14 | Massachusetts Financial Services Company | 3.5% | SCHEDULE 13G/A |
| 2026-05-15 | Baron Capital Group, Inc. | 7.79% | SCHEDULE 13G/A |
| 2026-05-15 | Linonia Partners Fund LP | 9% | SCHEDULE 13G/A |
| 2026-07-02 | Baron Capital Group, Inc. | 10.8% | SCHEDULE 13G/A |
Questions about who owns Guidewire Software, Inc.
Who owns Guidewire Software, Inc.?
On this page, 5 holders' latest ownership filings report 5% or more of Guidewire Software, Inc.: Baron Capital Group, Inc. (10.8%, Schedule 13G/A, filed 2026-07-02), BlackRock, Inc. (10.2%, Schedule 13G/A, filed 2025-07-02), Linonia Partners Fund LP (9%, Schedule 13G/A, filed 2026-05-15), Vanguard Portfolio Management (5.45%, Schedule 13G, filed 2026-04-29) and Vanguard Capital Management (5.3%, Schedule 13G, filed 2026-04-30).
Who are the largest shareholders of Guidewire Software, Inc.?
By the share each holder's latest filing reports, the largest holders of Guidewire Software, Inc. on this page are Baron Capital Group, Inc. (10.8%), BlackRock, Inc. (10.2%) and Linonia Partners Fund LP (9%).
When did Baron Capital Group, Inc. buy into Guidewire Software, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Baron Capital Group, Inc. on this page is the Schedule 13G/A, filed 2026-02-17, reporting 6.05%; its latest, Schedule 13G/A filed 2026-07-02, reports 10.8%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 11 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for Guidewire Software, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| September 3, 2026 | Leadership change: David Peterson departs, Chief Accounting Officer | — | Leadership changes | Source |
| July 22, 2026 | Leadership change: Alexander Vollert appointed, Director | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.