Chuck Royce's AMPH Position Overview
Chuck Royce (via Royce & Associates Lp) currently holds 294,758 shares of Amphastar Pharmaceuticals, Inc. (AMPH) worth $5.95 M, representing 0.05% of the portfolio. First purchased in 2021-Q4, this medium-term investment has been held for 15 quarters.
Based on 13F filings, Chuck Royce has maintained a strategic position in AMPH, demonstrating sustained confidence in this investment. Largest addition occurred in Q1 2025, adding 238,956 shares. Largest reduction occurred in Q2 2026, reducing 111,417 shares.
Analysis based on 13F filings available since 2013 Q2
Chuck Royce's Amphastar Pharmaceuticals (AMPH) Holding Value Over Time
Track share changes against reported price movement
Quarterly Amphastar Pharmaceuticals (AMPH) Trades by Chuck Royce
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q2 2026 | -111,417 | Reduce 27.43% | 294,758 | $20.18 |
| Q1 2026 | +53,878 | Add 15.29% | 406,175 | $19.59 |
| Q4 2025 | -14,025 | Reduce 3.83% | 352,297 | $26.78 |
| Q3 2025 | +83,135 | Add 29.36% | 366,322 | $26.65 |
| Q2 2025 | +35,329 | Add 14.25% | 283,187 | $22.96 |
| Q1 2025 | +238,956 | Add 2684.30% | 247,858 | $28.99 |
| Q4 2024 | -174 | Reduce 1.92% | 8,902 | $37.13 |
| Q2 2024 | +9,076 | New Buy | 9,076 | $40.00 |
| Q2 2023 | -22,315 | Sold Out | 0 | $0.00 |
| Q1 2023 | +22,315 | New Buy | 22,315 | $37.50 |
| Q3 2022 | -13,546 | Sold Out | 0 | $0.00 |
| Q2 2022 | -7,354 | Reduce 35.19% | 13,546 | $34.77 |
| Q1 2022 | +894 | Add 4.47% | 20,900 | $35.89 |
| Q4 2021 | +20,006 | New Buy | 20,006 | $23.29 |
Chuck Royce's Amphastar Pharmaceuticals Investment FAQs
Chuck Royce first purchased Amphastar Pharmaceuticals, Inc. (AMPH) in Q4 2021, acquiring 20,006 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Chuck Royce has held Amphastar Pharmaceuticals, Inc. (AMPH) for 15 quarters since Q4 2021.
Chuck Royce's largest addition to Amphastar Pharmaceuticals, Inc. (AMPH) was in Q1 2025, adding 247,858 shares worth $7.19 M.
According to the latest 13F filing for Q2 2026, Chuck Royce's firm, Royce & Associates Lp, owns 294,758 shares of Amphastar Pharmaceuticals, Inc. (AMPH), valued at approximately $5.95 M.
As of the Q2 2026 filing, Amphastar Pharmaceuticals, Inc. (AMPH) represents approximately 0.05% of Chuck Royce's publicly disclosed stock portfolio, making it one of their key holdings.
Chuck Royce's peak holding in Amphastar Pharmaceuticals, Inc. (AMPH) was 406,175 shares, as reported at the end of Q1 2026.