Rong Zhou insider trades: Amphastar Pharmaceuticals (AMPH) stock sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Rong reports to the SEC
Open-market buys and sales
29 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Sep 16, 2026 | AMPH | ↓ Sell | 10,000 | $23.94 | $239K | Direct | Sep 17, 2026 (1d) |
| Dec 17, 2025 | AMPH | ↓ Sell | 9,787 | $26.20 | $256K | Direct | Dec 18, 2025 (1d) |
| Dec 13, 2024 | AMPH | ↓ Sell | 15,000 | $44.85 | $673K | Direct | Dec 16, 2024 (3d) |
| Nov 12, 2024 | AMPH | ↓ Sell | 6,893 | $48.88 | $337K | Direct | Nov 13, 2024 (1d) |
| Sep 13, 2024 | AMPH | ↓ Sell | 3,000 | $48.26 | $145K | Direct | Sep 17, 2024 (4d) |
| Aug 26, 2024 | AMPH | ↓ Sell | 4,000 | $48.35 | $193K | Direct | Aug 27, 2024 (1d) |
| Dec 4, 2023 | AMPH | ↓ Sell | 7,830 | $59.03 | $462K | Direct | Dec 5, 2023 (1d) |
| Jun 15, 2023 | AMPH | ↓ Sell | 5,000 | $51.79 | $259K | Direct | Jun 20, 2023 (5d) |
| Jun 13, 2023 | AMPH | ↓ Sell | 5,000 | $48.24 | $241K | Direct | Jun 14, 2023 (1d) |
| May 18, 2023 | AMPH | ↓ Sell | 10,000 | $44.20 | $442K | Direct | May 19, 2023 (1d) |
| Feb 25, 2022 | AMPH | ↓ Sell | 13,246 | $28.77 | $381K | Direct | Mar 1, 2022 (4d) |
| Feb 8, 2022 | AMPH | ↓ Sell | 7,000 | $26.77 | $187K | Direct | Feb 9, 2022 (1d) |
| Jan 10, 2022 | AMPH | ↓ Sell | 20,928 | $25.36 | $531K | Direct | Jan 11, 2022 (1d) |
| Nov 11, 2021 | AMPH | ↓ Sell | 7,813 | $21.67 | $169K | Direct | Nov 12, 2021 (1d) |
| Aug 2, 2021 | AMPH | ↓ Sell | 9,123 | $21.24 | $194K | Direct | Aug 4, 2021 (2d) |
| Jul 26, 2021 | AMPH | ↓ Sell | 6,000 | $20.87 | $125K | Direct | Jul 27, 2021 (1d) |
| Jul 20, 2021 | AMPH | ↓ Sell | 5,187 | $20.57 | $107K | Direct | Jul 22, 2021 (2d) |
| Jun 9, 2021 | AMPH | ↓ Sell | 12,912 | $19.43 | $251K | Direct | Jun 10, 2021 (1d) |
| May 14, 2021 | AMPH | ↓ Sell | 18,119 | $19.71 | $357K | Direct | May 17, 2021 (3d) |
| Jun 4, 2020 | AMPH | ↓ Sell | 22,969 | $18.98 | $436K | Direct | Jun 5, 2020 (1d) |
| May 6, 2019 | AMPH | ↓ Sell | 9,600 | $22.76 | $218K | Direct | May 7, 2019 (1d) |
| Mar 1, 2019 | AMPH | ↓ Sell | 3,200 | $25.00 | $80K | Direct | Mar 4, 2019 (3d) |
| Feb 5, 2019 | AMPH | ↓ Sell | 4,289 | $23.00 | $99K | Direct | Feb 7, 2019 (2d) |
| Dec 3, 2018 | AMPH | ↓ Sell | 1,089 | $22.00 | $24K | Direct | Dec 6, 2018 (3d) |
| Nov 9, 2018 | AMPH | ↓ Sell | 2,173 | $20.50 | $45K | Direct | Nov 13, 2018 (4d) |
| Dec 5, 2016 | AMPH | ↓ Sell | 61 | $20.70 | $1K | Direct | Dec 7, 2016 (2d) |
| Jun 15, 2016 | AMPH | ↓ Sell | 1,551 | $15.85 | $25K | Direct | Jun 17, 2016 (2d) |
| Dec 16, 2015 | AMPH | ↓ Sell | 772 | $14.29 | $11K | Direct | Dec 17, 2015 (1d) |
| Jun 17, 2015 | AMPH | ↓ Sell | 1,000 | $16.48 | $16K | Direct | Jun 19, 2015 (2d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other AMPH insiders
Open-market trades in the last 12 months
About Rong Zhou's insider trades
Rong Zhou is Senior EVP, Production Center at Amphastar Pharmaceuticals (AMPH). Since Jun 17, 2015, Rong has reported no open-market purchases and 29 sales worth $6.5M on SEC Form 4. In the last 12 months: 2 sales ($496K).
Their filings also include shares withheld for taxes (28 filings), option exercises (24 filings), grants and awards (12 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every AMPH insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.