Comparable stake leader
BAMCO INC /NY/
SEC ownership of Guidewire Software, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001528396.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
27 Aug 2026
- Public ticker
- GWRE on NYSE
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BAMCO INC /NY/
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BAMCO INC /NY/
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
27 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001528396
- Issuer location
- San Mateo, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Guidewire Software, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BAMCO INC /NY/
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
27 Aug 2026
13D/G
13F
3/4/5
Lead comparable stake: 11%
13D/G row: BAMCO INC /NY/
Showing 1-8 of 50 holder rows.
Quick read
BAMCO INC /NY/ leads the comparable SEC ownership view at 11%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BAMCO INC /NY/'s linked filing trail.
Comparable ownership
Top 5
BAMCO INC /NY/
11%
BlackRock, Inc.
10%
Linonia Partnership LP
9%
VANGUARD PORTFOLIO MANAGEMENT LLC
5.4%
VANGUARD CAPITAL MANAGEMENT LLC
5.3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BAMCO INC /NY/ |
13D/G
13F
Baron Capital Group, Inc. · Company
|
11%
|
$1,143,135,769
8,987,623 shares
|
+$304,811,980 | 30 Jun 2026 |
| BlackRock, Inc. |
13D/G
13F
Company
|
10%
|
$2,156,068,191
8,602,251 shares
|
+$102,644,850 | 30 Jun 2025 |
| Linonia Partnership LP |
13D/G
13F
Linonia Partners Fund LP · Company
|
9%
|
$902,450,784
7,651,130 shares
|
+$269,917,016 | 31 Mar 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13D/G
13F
Vanguard Portfolio Management · Company
|
5.4%
|
$690,498,928
4,616,869 shares
|
$0 | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5.3%
|
$671,908,470
4,492,568 shares
|
$0 | 31 Mar 2026 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ |
13D/G
13F
Massachusetts Financial Services Company · Company
|
3.5%
|
$353,299,999
2,995,337 shares
|
-$170,031,294 | 31 Mar 2026 |
| Michael George Rosenbaum |
3/4/5
Chief Executive Officer, Director
|
0.23%
|
$35,268,088
187,776 shares
|
-$21,453,504 | 24 Aug 2026 |
| John P. Mullen |
3/4/5
President
|
0.14%
|
$21,317,652
113,115 shares
|
-$12,980,224 | 19 Aug 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$48,571,700.
Buys
$0
Insiders: 0
Sells
$48,571,700
Insiders: 6
Net
-$48,571,700
Shares: -242,599
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 242,599
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 53,093 | $0 | $8,129,600 | -$8,129,600 |
| 3-6 | 0 | 34,879 | $0 | $5,371,675 | -$5,371,675 |
| 6-9 | 0 | 40,385 | $0 | $7,539,057 | -$7,539,057 |
| 9-12 | 0 | 114,242 | $0 | $27,531,367 | -$27,531,367 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-19 of 19 reporting-owner rows connected to Guidewire Software, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
19
Largest Forms 3/4/5 holder
Michael George Rosenbaum
Net 12M change
-$48,571,700
Latest report
27 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Michael George Rosenbaum | Chief Executive Officer, Director | $35,268,088 | -$21,453,504 | -38% | Filing P/S | 24 Aug 2026 |
| John P. Mullen | President | $21,317,652 | -$12,980,224 | -38% | Filing P/S | 19 Aug 2026 |
| Jeffrey Elliott Cooper | Chief Financial Officer | $6,564,114 | -$7,653,037 | -54% | Filing P/S | 22 Jun 2026 |
| Priscilla Hung | President & COO | $4,274,485 | Mixed | 19 Dec 2023 | ||
| Catherine P. Lego | Director | $4,148,248 | Mixed | 15 Dec 2025 | ||
| Margaret Dillon | Director | $4,148,248 | Mixed | 15 Dec 2025 | ||
| James Winston King | Chief Admin Officer, Gen Couns | $3,921,551 | -$5,037,170 | -56% | Filing P/S | 09 Jul 2026 |
| Frank E. ODowd Jr. | Chief Sales Officer | $3,169,628 | Mixed | 17 Sep 2021 | ||
| Rajani Ramanathan | Director | $2,797,973 | Mixed | 15 Dec 2025 | ||
| Michael C. Keller | Director | $2,683,848 | Mixed | 15 Dec 2025 | ||
| Paul Lavin | Director | $2,351,253 | Mixed | 22 Dec 2024 | ||
| David Franklin Peterson | Chief Accounting Officer | $1,957,400 | -$1,332,400 | -41% | Filing P/S | 27 Aug 2026 |
| David S. Bauer | Director | $1,796,401 | -$115,365 | -6% | Mixed | 15 Dec 2025 |
| Marcus Ryu | Director | $1,183,216 | Mixed | 19 Dec 2023 | ||
| Andrew William Fraser Brown | Director | $955,540 | Mixed | 23 Jun 2022 | ||
| Michael Polelle | Chief Delivery Officer | $811,716 | Mixed | 17 Mar 2022 | ||
| Mark Anquillare V | Director | $687,283 | Mixed | 15 Dec 2025 | ||
| Jeffrey Steven Sloan | Director | $599,981 | Mixed | 15 Dec 2025 | ||
| Karl Alexander Vollert | Director | $71,122 | Median | 12 Aug 2026 |
Recent insider transactions for Guidewire Software, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| David Franklin Peterson | GWRE | Common Stock | Sale | -20.4% | $500,000 | $200.00 | -2,500 | 9,787 | 27 Aug 2026 | Direct |
| John P. Mullen | GWRE | Common Stock | Sale | -1.57% | $339,228 | $188.46 | -1,800 | 113,115 | 25 Aug 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.64% | $225,384 | $187.82 | -1,200 | 187,776 | 24 Aug 2026 | Direct |
| John P. Mullen | GWRE | Common Stock | Sale | -12.4% | $2,997,000 | $185.00 | -16,200 | 114,915 | 19 Aug 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.63% | $207,456 | $172.88 | -1,200 | 188,976 | 17 Aug 2026 | Direct |
| Karl Alexander Vollert | GWRE | Common Stock | Award | 578 | 578 | 12 Aug 2026 | Direct | |||
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.63% | $203,400 | $169.50 | -1,200 | 190,176 | 10 Aug 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.62% | $187,104 | $155.92 | -1,200 | 191,376 | 03 Aug 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.62% | $170,772 | $142.31 | -1,200 | 192,576 | 27 Jul 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.62% | $176,904 | $147.42 | -1,200 | 193,776 | 20 Jul 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.61% | $166,164 | $138.47 | -1,200 | 194,976 | 13 Jul 2026 | Direct |
| James Winston King | GWRE | Common Stock | Sale | -5.31% | $219,998 | $130.64 | -1,684 | 30,018 | 09 Jul 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.61% | $157,956 | $131.63 | -1,200 | 196,176 | 06 Jul 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.6% | $149,148 | $124.29 | -1,200 | 197,376 | 29 Jun 2026 | Direct |
| Jeffrey Elliott Cooper | GWRE | Common Stock | Sale | -2.12% | $142,443 | $105.67 | -1,348 | 62,119 | 22 Jun 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.6% | $126,804 | $105.67 | -1,200 | 198,576 | 22 Jun 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -2.84% | $692,272 | $118.74 | -5,830 | 199,776 | 16 Jun 2026 | Direct |
| Jeffrey Elliott Cooper | GWRE | Common Stock | Sale | -3.93% | $308,019 | $118.74 | -2,594 | 63,467 | 16 Jun 2026 | Direct |
| David Franklin Peterson | GWRE | Common Stock | Sale | -1.96% | $29,211 | $118.74 | -246 | 12,287 | 16 Jun 2026 | Direct |
| James Winston King | GWRE | Common Stock | Sale | -3.05% | $118,624 | $118.74 | -999 | 31,702 | 16 Jun 2026 | Direct |
| John P. Mullen | GWRE | Common Stock | Sale | -3.17% | $509,645 | $118.74 | -4,292 | 131,115 | 16 Jun 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.58% | $148,620 | $123.85 | -1,200 | 205,606 | 15 Jun 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.58% | $162,744 | $135.62 | -1,200 | 206,806 | 08 Jun 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.57% | $190,704 | $158.92 | -1,200 | 208,006 | 01 Jun 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.57% | $166,212 | $138.51 | -1,200 | 209,206 | 26 May 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.57% | $153,828 | $128.19 | -1,200 | 210,406 | 18 May 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.56% | $163,656 | $136.38 | -1,200 | 211,606 | 11 May 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.56% | $170,292 | $141.91 | -1,200 | 212,806 | 04 May 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.56% | $165,708 | $138.09 | -1,200 | 214,006 | 27 Apr 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.55% | $167,700 | $139.75 | -1,200 | 215,206 | 20 Apr 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.55% | $142,524 | $118.77 | -1,200 | 216,406 | 13 Apr 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.55% | $181,368 | $151.14 | -1,200 | 217,606 | 06 Apr 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.55% | $174,888 | $145.74 | -1,200 | 218,806 | 30 Mar 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.54% | $186,672 | $155.56 | -1,200 | 220,006 | 23 Mar 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -2.1% | $776,195 | $163.86 | -4,737 | 221,206 | 17 Mar 2026 | Direct |
| John P. Mullen | GWRE | Common Stock | Sale | -4.63% | $1,077,530 | $163.86 | -6,576 | 135,407 | 17 Mar 2026 | Direct |
| James Winston King | GWRE | Common Stock | Sale | -2.97% | $164,022 | $163.86 | -1,001 | 32,701 | 17 Mar 2026 | Direct |
| Jeffrey Elliott Cooper | GWRE | Common Stock | Sale | -2.85% | $317,065 | $163.86 | -1,935 | 66,061 | 17 Mar 2026 | Direct |
| David Franklin Peterson | GWRE | Common Stock | Sale | -2.13% | $44,733 | $163.86 | -273 | 12,533 | 17 Mar 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.53% | $192,000 | $160.00 | -1,200 | 225,943 | 16 Mar 2026 | Direct |
| Jeffrey Elliott Cooper | GWRE | Common Stock | Sale | -6.54% | $755,031 | $158.72 | -4,757 | 67,996 | 13 Mar 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.53% | $199,608 | $166.34 | -1,200 | 227,143 | 09 Mar 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.52% | $172,644 | $143.87 | -1,200 | 228,343 | 02 Mar 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.52% | $150,600 | $125.50 | -1,200 | 229,543 | 23 Feb 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.52% | $152,400 | $127.00 | -1,200 | 230,743 | 17 Feb 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.51% | $153,324 | $127.77 | -1,200 | 231,943 | 09 Feb 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.51% | $168,012 | $140.01 | -1,200 | 233,143 | 02 Feb 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.51% | $192,384 | $160.32 | -1,200 | 234,343 | 26 Jan 2026 | Direct |
| Michael George Rosenbaum | GWRE | Common Stock | Sale | -0.51% | $187,512 | $156.26 | -1,200 | 235,543 | 20 Jan 2026 | Direct |
| Jeffrey Elliott Cooper | GWRE | Common Stock | Sale | -0.3% | $39,068 | $180.87 | -216 | 72,753 | 13 Jan 2026 | Direct |
* marks a reported price that did not pass the local price check.