| 2004-12-02 | ZENITH NATIONAL INSURANCE CORP | A | +2,000 sh | — | — | 7,000 |
| 2004-05-26 | ZENITH NATIONAL INSURANCE CORP | A | +5,000 sh | — | — | 5,000 |
| 2003-11-19 | ZENITH NATIONAL INSURANCE CORP | M | +6,200 sh | $19.16 | +$119K | 6,200 |
| 2003-11-19 | ZENITH NATIONAL INSURANCE CORP | S | ▼−2,000 sh | $31.70 | ▼−$63.4K | 4,200 |
| 2003-11-19 | ZENITH NATIONAL INSURANCE CORP | S | ▼−600 sh | $31.72 | ▼−$19K | 3,600 |
| 2003-11-19 | ZENITH NATIONAL INSURANCE CORP | S | ▼−2,400 sh | $31.73 | ▼−$76.2K | 1,200 |
| 2003-11-19 | ZENITH NATIONAL INSURANCE CORP | S | ▼−1,100 sh | $31.74 | ▼−$34.9K | 100 |
| 2003-11-19 | ZENITH NATIONAL INSURANCE CORP | S | ▼−100 sh | $31.71 | ▼−$3,171 | 0 |
| 2003-11-19 | ZENITH NATIONAL INSURANCE CORP | M | −6,200 sh | — | — | 15,000 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | M | +3,800 sh | $19.16 | +$72.8K | 3,800 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−400 sh | $31.70 | ▼−$12.7K | 3,400 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−200 sh | $32.04 | ▼−$6,408 | 3,200 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−100 sh | $32.11 | ▼−$3,211 | 3,100 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−100 sh | $32.16 | ▼−$3,216 | 3,000 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−100 sh | $32.24 | ▼−$3,224 | 2,900 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−100 sh | $32.28 | ▼−$3,228 | 2,800 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−400 sh | $32.32 | ▼−$12.9K | 2,400 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−800 sh | $32.33 | ▼−$25.9K | 1,600 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−400 sh | $32.34 | ▼−$12.9K | 1,200 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−100 sh | $32.35 | ▼−$3,235 | 1,100 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−100 sh | $32.38 | ▼−$3,238 | 1,000 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−100 sh | $32.44 | ▼−$3,244 | 900 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−400 sh | $32.50 | ▼−$13K | 500 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−400 sh | $32.51 | ▼−$13K | 100 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | S | ▼−100 sh | $32.52 | ▼−$3,252 | 0 |
| 2003-11-18 | ZENITH NATIONAL INSURANCE CORP | M | −3,800 sh | — | — | 21,200 |