Advisory Research’s Amphastar Pharmaceuticals AMPH Stock Holding History

Advisory Research's AMPH Position: Q2 2026 in Review

Advisory Research increased its Amphastar Pharmaceuticals (AMPH) stake by 0.01% in Q2 2026, buying an estimated $40 and bringing the position to 25,337 shares worth $511K. The position accounts for 0.05% of the portfolio, ranked #129.

Advisory Research first reported a position in AMPH in Q3 2022 and has held it in 15 quarters since. The position peaked at $885K in Q2 2023. 212 funds tracked by Wall St. Rank hold AMPH as of Q2 2026.

• Advisory Research held 25,337 shares of Amphastar Pharmaceuticals worth $511K as of Q2 2026.
• Advisory Research bought 2 Amphastar Pharmaceuticals shares in Q2 2026, an estimated $40.
• Amphastar Pharmaceuticals made up 0.05% of Advisory Research's portfolio in Q2 2026, its #129 holding.
• Advisory Research first reported a position in Amphastar Pharmaceuticals in Q3 2022 and has held it in 15 quarters since.
• Advisory Research's Amphastar Pharmaceuticals position peaked at $885K in Q2 2023.
• 212 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q2 2026.

Based on Advisory Research's 13F filing for Q2 2026, filed 13 Aug 2026.