SEC Form 4 · Updated Daily
WPO
Insider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| BERKSHIRE HATHAWAY INC | 10%+ Owner | 109,128 | 2014-06-30 | J |
| BUFFETT WARREN E | 10%+ Owner | 109,128 | 2014-06-30 | J |
| NATIONAL INDEMNITY CO | 10%+ Owner | 109,128 | 2014-06-30 | J |
| Rosen Andrew Stephen | Officer | 37,773 | 2025-01-02 | A |
| O'Shaughnessy Timothy J | Director · Officer | 22,878 | 2026-08-13 | J |
| O'Shaughnessy Laura | Director | 22,865 | 2026-08-13 | J |
| Maas, Jacob | Officer | 7,657 | 2026-08-28 | A |
| Weymouth Katharine | Director | 7,615 | 2026-05-26 | J |
| Davis Christopher C | Director | 5,638 | 2026-10-01 | A |
| ROSBERG GERALD M | Officer | 5,525 | 2015-01-01 | A |
| DANIELS DIANA M | Officer | 4,445 | 2006-08-29 | M |
| Maddrey Nicole Marie | Officer | 4,223 | 2025-01-02 | A |
| Diller Barry | Director · Officer | 4,000 | 2011-11-15 | P |
| Cooney Wallace R. | Officer | 3,746 | 2025-01-02 | A |
| MORSE JOHN B JR | Director | 3,306 | 2007-04-13 | G |
| Jones Hal | Reporting Owner | 2,975 | 2015-01-01 | A |
| Dillon Veronica | Officer | 2,425 | 2014-12-19 | S |
| MCDANIEL ANN | Director | 2,000 | 2015-03-04 | S |
| Demeter Denise M | Officer | 1,650 | 2019-01-02 | A |
| Jones Boisfeuillet JR | Officer | 1,619 | 2011-01-05 | A |
| WAGONER G RICHARD JR | Director | 1,575 | 2026-10-01 | A |
| Stonesifer Sandra M. | Officer | 1,543 | 2025-01-02 | A |
| Bollinger Lee C | Director | 1,150 | 2020-08-27 | P |
| Goldberg David Bruce | Director | 1,000 | 2014-05-09 | P |
| MULCAHY ANNE M | Director | 779 | 2026-10-01 | A |
| GAYNER THOMAS SINNICKSON | Director · Officer | 700 | 2024-09-12 | P |
| Snyman Marcel A. | Officer | 685 | 2025-01-02 | A |
| CONLEY DANIELLE Y. | Director | 480 | 2026-10-01 | A |
| Thompson Larry D. | Director | 76 | 2011-12-30 | P |
| Markell Jack A. | Director | 55 | 2026-10-01 | A |
| Allen Tony | Director | 8 | 2025-07-30 | S |
| GRAHAM DONALD | 10%+ Owner · Director | 0 | 2019-12-16 | J |
| OLSON RONALD L | Director | 0 | 2010-12-30 | S |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-10-01 | CONLEY DANIELLE Y. | Grant / award | 19 | $1139.10 | 480 |
| 2026-10-01 | Davis Christopher C | Grant / award | 24 | $1139.10 | 5,638 |
| 2026-10-01 | Markell Jack A. | Grant / award | 7 | $1139.10 | 55 |
| 2026-10-01 | MULCAHY ANNE M | Grant / award | 21 | $1139.10 | 779 |
| 2026-10-01 | WAGONER G RICHARD JR | Grant / award | 21 | $1139.10 | 1,575 |
| 2026-08-28 | Maas, Jacob | Tax withholding | 501 | $1159.23 | 7,156 |
| 2026-08-28 | Maas, Jacob | Grant / award | 1,000 | $0.00 | 7,657 |
| 2026-08-13 | GRAHAM DONALD | J (derivative) | 12,633 | — | 375,592 |
| 2026-08-13 | O'Shaughnessy Laura | J (derivative) | 4,211 | — | 19,922 |
| 2026-08-13 | O'Shaughnessy Laura | J (derivative) | 4,211 | — | 15,711 |
| 2026-08-13 | O'Shaughnessy Laura | J | 4,211 | — | 22,865 |
| 2026-08-13 | O'Shaughnessy Timothy J | J (derivative) | 4,211 | — | 19,922 |
| 2026-08-13 | O'Shaughnessy Timothy J | J (derivative) | 4,211 | — | 15,711 |
| 2026-08-13 | O'Shaughnessy Timothy J | J | 4,211 | — | 22,878 |
| 2026-07-01 | CONLEY DANIELLE Y. | Grant / award | 19 | $1161.11 | 461 |
| 2026-07-01 | Davis Christopher C | Grant / award | 23 | $1161.11 | 5,614 |
| 2026-07-01 | Markell Jack A. | Grant / award | 7 | $1161.11 | 48 |
| 2026-07-01 | MULCAHY ANNE M | Grant / award | 21 | $1161.11 | 758 |
| 2026-07-01 | WAGONER G RICHARD JR | Grant / award | 21 | $1161.11 | 1,554 |
| 2026-05-26 | O'Shaughnessy Timothy J | J (derivative) | 6,000 | — | 11,500 |
| 2026-05-26 | O'Shaughnessy Timothy J | J | 400 | — | 27,087 |
| 2026-05-26 | O'Shaughnessy Timothy J | J | 5,600 | — | 0 |
| 2026-05-26 | Weymouth Katharine | J (derivative) | 6,000 | — | 30,000 |
| 2026-05-26 | Weymouth Katharine | J | 6,000 | — | 7,615 |
| 2026-05-26 | O'Shaughnessy Laura | J (derivative) | 6,000 | — | 11,500 |
| 2026-05-26 | O'Shaughnessy Laura | J | 400 | — | 27,076 |
| 2026-05-26 | O'Shaughnessy Laura | J | 5,600 | — | 0 |
| 2026-04-01 | CONLEY DANIELLE Y. | Grant / award | 21 | $1061.70 | 442 |
| 2026-04-01 | Davis Christopher C | Grant / award | 25 | $1061.70 | 5,591 |
| 2026-04-01 | Markell Jack A. | Grant / award | 8 | $1061.70 | 41 |
| 2026-04-01 | MULCAHY ANNE M | Grant / award | 23 | $1061.70 | 737 |
| 2026-04-01 | WAGONER G RICHARD JR | Grant / award | 23 | $1061.70 | 1,533 |
| 2026-01-16 | Maas, Jacob | Tax withholding | 377 | $1150.50 | 6,657 |
| 2026-01-16 | Maas, Jacob | Grant / award | 1,000 | $0.00 | 7,034 |
| 2026-01-02 | CONLEY DANIELLE Y. | Grant / award | 20 | $1091.18 | 421 |
| 2026-01-02 | Davis Christopher C | Grant / award | 25 | $1091.18 | 5,566 |
| 2026-01-02 | Markell Jack A. | Grant / award | 8 | $1091.18 | 33 |
| 2026-01-02 | MULCAHY ANNE M | Grant / award | 22 | $1091.18 | 714 |
| 2026-01-02 | WAGONER G RICHARD JR | Grant / award | 22 | $1091.18 | 1,510 |
| 2025-12-29 | Weymouth Katharine | J (derivative) | 36,000 | — | 36,000 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.