Cliff Asness's AMPH Position Overview
Cliff Asness (via Aqr Capital Management LLC) currently holds 208,651 shares of Amphastar Pharmaceuticals, Inc. (AMPH) worth $4.21 M, representing 0.00% of the portfolio. First purchased in 2015-Q3, this long-term strategic position has been held for 44 quarters.
Based on 13F filings since 2013, Cliff Asness has maintained a long-term strategic position in AMPH, representing a significant commitment to this investment thesis. Largest addition occurred in Q2 2026, adding 129,873 shares. Largest reduction occurred in Q2 2023, reducing 51,851 shares.
Analysis based on 13F filings available since 2013 Q2
Cliff Asness's Amphastar Pharmaceuticals (AMPH) Holding Value Over Time
Track share changes against reported price movement
Quarterly Amphastar Pharmaceuticals (AMPH) Trades by Cliff Asness
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q2 2026 | +129,873 | Add 164.86% | 208,651 | $20.18 |
| Q1 2026 | +11,126 | Add 16.45% | 78,778 | $19.59 |
| Q4 2025 | +5,507 | Add 8.86% | 67,652 | $26.78 |
| Q3 2025 | -13,700 | Reduce 18.06% | 62,145 | $26.65 |
| Q2 2025 | +22,207 | Add 41.40% | 75,845 | $22.96 |
| Q1 2025 | +24,167 | Add 82.00% | 53,638 | $28.99 |
| Q4 2024 | -12,196 | Reduce 29.27% | 29,471 | $37.13 |
| Q3 2024 | -14,129 | Reduce 25.32% | 41,667 | $48.53 |
| Q2 2024 | -1,258 | Reduce 2.20% | 55,796 | $40.00 |
| Q1 2024 | +44,310 | Add 347.69% | 57,054 | $43.91 |
| Q4 2023 | -16,246 | Reduce 56.04% | 12,744 | $61.85 |
| Q3 2023 | -30,046 | Reduce 50.89% | 28,990 | $45.99 |
| Q2 2023 | -51,851 | Reduce 46.76% | 59,036 | $57.47 |
| Q1 2023 | -1,716 | Reduce 1.52% | 110,887 | $37.50 |
| Q4 2022 | +17,850 | Add 18.84% | 112,603 | $28.02 |
| Q3 2022 | +59,463 | Add 168.50% | 94,753 | $28.10 |
| Q2 2022 | +21,791 | Add 161.43% | 35,290 | $34.80 |
| Q1 2022 | +2,924 | Add 27.65% | 13,499 | $35.93 |
| Q4 2021 | -8,702 | Reduce 45.14% | 10,575 | $23.26 |
| Q3 2021 | -591 | Reduce 2.97% | 19,277 | $18.99 |
| Q2 2021 | -4,653 | Reduce 18.98% | 19,868 | $20.18 |
| Q1 2021 | -12,125 | Reduce 33.09% | 24,521 | $18.31 |
| Q4 2020 | -15,829 | Reduce 30.16% | 36,646 | $20.11 |
| Q3 2020 | -23,498 | Reduce 30.93% | 52,475 | $18.75 |
| Q2 2020 | -12,873 | Reduce 14.49% | 75,973 | $22.46 |
| Q1 2020 | +50,278 | Add 130.36% | 88,846 | $14.83 |
| Q4 2019 | -1,567 | Reduce 3.90% | 38,568 | $19.29 |
| Q3 2019 | +21,632 | Add 116.91% | 40,135 | $19.83 |
| Q2 2019 | -3,108 | Reduce 14.38% | 18,503 | $21.13 |
| Q1 2019 | -492 | Reduce 2.23% | 21,611 | $20.45 |
| Q4 2018 | -2,523 | Reduce 10.25% | 22,103 | $19.91 |
| Q3 2018 | +4,963 | Add 25.24% | 24,626 | $19.25 |
| Q2 2018 | -839 | Reduce 4.09% | 19,663 | $15.26 |
| Q4 2017 | -3,913 | Reduce 16.03% | 20,502 | $19.22 |
| Q3 2017 | -41,495 | Reduce 62.96% | 24,415 | $17.86 |
| Q2 2017 | -33,731 | Reduce 33.85% | 65,910 | $17.86 |
| Q1 2017 | +6,912 | Add 7.45% | 99,641 | $14.50 |
| Q4 2016 | -14,253 | Reduce 13.32% | 92,729 | $18.42 |
| Q3 2016 | +67,270 | Add 169.39% | 106,982 | $18.97 |
| Q2 2016 | +17,853 | Add 81.67% | 39,712 | $16.12 |
| Q1 2016 | -5,391 | Reduce 19.78% | 21,859 | $11.99 |
| Q4 2015 | +3,080 | Add 12.74% | 27,250 | $14.24 |
| Q3 2015 | +24,170 | New Buy | 24,170 | $11.71 |
Cliff Asness's Amphastar Pharmaceuticals Investment FAQs
Cliff Asness first purchased Amphastar Pharmaceuticals, Inc. (AMPH) in Q3 2015, acquiring 24,170 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Cliff Asness has held Amphastar Pharmaceuticals, Inc. (AMPH) for 44 quarters since Q3 2015.
Cliff Asness's largest addition to Amphastar Pharmaceuticals, Inc. (AMPH) was in Q2 2026, adding 208,651 shares worth $4.21 M.
According to the latest 13F filing for Q2 2026, Cliff Asness's firm, Aqr Capital Management LLC, owns 208,651 shares of Amphastar Pharmaceuticals, Inc. (AMPH), valued at approximately $4.21 M.
As of the Q2 2026 filing, Amphastar Pharmaceuticals, Inc. (AMPH) represents approximately 0.00% of Cliff Asness's publicly disclosed stock portfolio, making it one of their key holdings.
Cliff Asness's peak holding in Amphastar Pharmaceuticals, Inc. (AMPH) was 208,651 shares, as reported at the end of Q2 2026.