Richard K Prins insider trades: Amphastar Pharmaceuticals (AMPH) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Richard reports to the SEC
Open-market buys and sales
43 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Aug 11, 2026 | AMPH | ↓ Sell | 7,973 | $20.30 | $162K | Direct | Aug 12, 2026 (1d) |
| Nov 25, 2025 | AMPH | ↓ Sell | 4,179 | $27.10 | $113K | Direct | Nov 25, 2025 (0d) |
| Dec 9, 2024 | AMPH | ↓ Sell | 10,000 | $43.77 | $438K | Direct | Dec 11, 2024 (2d) |
| Nov 12, 2024 | AMPH | ↓ Sell | 5,000 | $48.80 | $244K | Direct | Nov 13, 2024 (1d) |
| Aug 12, 2024 | AMPH | ↓ Sell | 17,101 | $43.07 | $737K | Direct | Aug 13, 2024 (1d) |
| Nov 17, 2023 | AMPH | ↓ Sell | 4,000 | $55.86 | $223K | Direct | Nov 20, 2023 (3d) |
| Nov 13, 2023 | AMPH | ↓ Sell | 5,000 | $52.50 | $263K | Direct | Nov 15, 2023 (2d) |
| Aug 18, 2023 | AMPH | ↓ Sell | 2,000 | $52.50 | $105K | Direct | Aug 21, 2023 (3d) |
| Aug 15, 2023 | AMPH | ↓ Sell | 4,163 | $57.39 | $239K | Direct | Aug 16, 2023 (1d) |
| May 15, 2023 | AMPH | ↓ Sell | 10,000 | $42.78 | $428K | Direct | May 16, 2023 (1d) |
| Mar 15, 2022 | AMPH | ↓ Sell | 10,000 | $34.02 | $340K | Direct | Mar 17, 2022 (2d) |
| Dec 10, 2021 | AMPH | ↓ Sell | 5,291 | $21.36 | $113K | Direct | Dec 13, 2021 (3d) |
| Nov 22, 2021 | AMPH | ↓ Sell | 5,000 | $21.22 | $106K | Direct | Nov 23, 2021 (1d) |
| Jun 7, 2021 | AMPH | ↓ Sell | 10,000 | $18.74 | $187K | Direct | Jun 8, 2021 (1d) |
| May 11, 2021 | AMPH | ↓ Sell | 15,827 | $18.90 | $299K | Direct | May 13, 2021 (2d) |
| Mar 9, 2021 | IGC | ↓ Sell | 50,000 | $1.75 | $88K | Direct | Mar 10, 2021 (1d) |
| Mar 3, 2021 | IGC | ↓ Sell | 50,000 | $1.80 | $90K | Direct | Mar 8, 2021 (5d) |
| Dec 1, 2020 | IGC | ↓ Sell | 50,000 | $2.04 | $102K | Direct | Dec 4, 2020 (3d) |
| Aug 11, 2020 | AMPH | ↓ Sell | 6,000 | $20.33 | $122K | Direct | Aug 12, 2020 (1d) |
| May 12, 2020 | AMPH | ↓ Sell | 30,282 | $19.00 | $575K | Direct | May 14, 2020 (2d) |
| Aug 26, 2019 | AMPH | ↓ Sell | 7,500 | $22.59 | $169K | Direct | Aug 27, 2019 (1d) |
| Aug 13, 2019 | AMPH | ↓ Sell | 10,000 | $20.78 | $208K | Direct | Aug 15, 2019 (2d) |
| Dec 14, 2018 | AMPH | ↓ Sell | 1,616 | $20.65 | $33K | Direct | Dec 17, 2018 (3d) |
| Nov 29, 2018 | AMPH | ↓ Sell | 5,000 | $20.50 | $103K | Direct | Nov 30, 2018 (1d) |
| Nov 14, 2018 | AMPH | ↓ Sell | 5,000 | $20.23 | $101K | Direct | Nov 15, 2018 (1d) |
| Aug 27, 2018 | IGC | ↓ Sell | 50,000 | $1.08 | $54K | Direct | Jun 12, 2019 (289d) |
| Aug 14, 2018 | AMPH | ↓ Sell | 10,000 | $17.82 | $178K | Direct | Aug 15, 2018 (1d) |
| Mar 15, 2018 | AMPH | ↓ Sell | 16,598 | $19.90 | $330K | Direct | Mar 16, 2018 (1d) |
| Dec 4, 2017 | IGC | ↓ Sell | 25,000 | $0.55 | $14K | Direct | Dec 5, 2017 (1d) |
| Aug 15, 2017 | AMPH | ↓ Sell | 10,000 | $14.81 | $148K | Direct | Aug 16, 2017 (1d) |
| Jun 9, 2017 | AMPH | ↓ Sell | 10,000 | $17.07 | $171K | Direct | Jun 12, 2017 (3d) |
| May 11, 2017 | AMPH | ↓ Sell | 7,500 | $15.43 | $116K | Direct | May 12, 2017 (1d) |
| Nov 11, 2016 | AMPH | ↓ Sell | 8,000 | $20.06 | $161K | Direct | Nov 15, 2016 (4d) |
| Aug 18, 2016 | AMPH | ↓ Sell | 3,086 | $19.62 | $61K | Direct | Aug 19, 2016 (1d) |
| Aug 11, 2016 | AMPH | ↓ Sell | 13,993 | $18.03 | $252K | Direct | Aug 12, 2016 (1d) |
| Jun 13, 2016 | AMPH | ↓ Sell | 7,500 | $15.94 | $120K | Direct | Jun 13, 2016 (0d) |
| May 17, 2016 | AMPH | ↓ Sell | 3,200 | $13.56 | $43K | Direct | May 19, 2016 (2d) |
| Mar 17, 2016 | AMPH | ↓ Sell | 2,400 | $11.25 | $27K | Direct | Mar 21, 2016 (4d) |
| Nov 17, 2015 | AMPH | ↓ Sell | 3,772 | $13.95 | $53K | Direct | Nov 19, 2015 (2d) |
| Aug 18, 2015 | AMPH | ↓ Sell | 14,500 | $14.67 | $213K | Direct | Aug 19, 2015 (1d) |
| May 22, 2015 | AMPH | ↓ Sell | 29,452 | $14.77 | $435K | Direct | May 22, 2015 (0d) |
| May 19, 2015 | AMPH | ↓ Sell | 3,000 | $14.94 | $45K | Direct | May 20, 2015 (1d) |
| Aug 18, 2014 | AMPH | ↑ Buy | 4,000 | $10.02 | $40K | Direct | Aug 19, 2014 (1d) |
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 Richard K Prins's insider trades
Richard K Prins is an insider at Amphastar Pharmaceuticals (AMPH). Since Aug 18, 2014, Richard has reported 1 open-market purchase worth $40K and 42 sales worth $8.0M on SEC Form 4. In the last 12 months: 2 sales ($275K).
Their filings also include option exercises (31 filings), grants and awards (23 filings), gifts (19 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.