Zhou Rong (CIK 1645326) reported 12 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-03-17). Recent activity: Sell AMPH (1,225 shares), Buy AMPH (39,432 shares), Sell AMPH (2,215 shares), Sell AMPH (1,357 shares), Sell AMPH (1,124 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-17 | Amphastar Pharmaceuticals, Inc. (AMPH) | SENIOR EVP, PRODUCTION CENTER | Sell | 1,225 | $22,270 |
| 2026-03-11 | Amphastar Pharmaceuticals, Inc. (AMPH) | SENIOR EVP, PRODUCTION CENTER | Buy | 39,432 | $0 |
| 2026-03-11 | Amphastar Pharmaceuticals, Inc. (AMPH) | SENIOR EVP, PRODUCTION CENTER | Sell | 2,215 | $41,886 |
| 2026-03-10 | Amphastar Pharmaceuticals, Inc. (AMPH) | SENIOR EVP, PRODUCTION CENTER | Sell | 1,357 | $26,244 |
| 2026-03-06 | Amphastar Pharmaceuticals, Inc. (AMPH) | SENIOR EVP, PRODUCTION CENTER | Sell | 1,124 | $22,435 |
| 2025-12-18 | Amphastar Pharmaceuticals, Inc. (AMPH) | SENIOR EVP, PRODUCTION CENTER | Buy | 9,787 | $110,887 |
| 2025-12-18 | Amphastar Pharmaceuticals, Inc. (AMPH) | SENIOR EVP, PRODUCTION CENTER | Sell | 9,787 | $256,419 |
| 2025-03-18 | Amphastar Pharmaceuticals, Inc. (AMPH) | SENIOR EVP, PRODUCTION CENTER | Sell | 1,222 | $32,579 |
| 2025-03-18 | Amphastar Pharmaceuticals, Inc. (AMPH) | SENIOR EVP, PRODUCTION CENTER | Sell | 1,967 | $54,466 |
| 2025-03-12 | Amphastar Pharmaceuticals, Inc. (AMPH) | SENIOR EVP, PRODUCTION CENTER | Buy | 24,692 | $0 |
| 2025-03-10 | Amphastar Pharmaceuticals, Inc. (AMPH) | SENIOR EVP, PRODUCTION CENTER | Sell | 1,354 | $38,345 |
| 2025-03-06 | Amphastar Pharmaceuticals, Inc. (AMPH) | SENIOR EVP, PRODUCTION CENTER | Sell | 1,121 | $30,962 |
Source: SEC Form 4 filings · as of 2026-03-17