Quantbot Technologies Cuts Stake in Amphastar Pharmaceuticals

Hedge fund reduces position in generic drug maker by over 50%

Published on Mar. 8, 2026

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Quantbot Technologies LP, a hedge fund, has reduced its stake in Amphastar Pharmaceuticals, Inc. (NASDAQ:AMPH) by 51.2% in the third quarter. The fund now owns 29,763 shares of the company's stock, down from 60,955 shares previously.

Why it matters

Amphastar Pharmaceuticals is a specialty pharmaceutical company that focuses on developing and manufacturing injectable and inhalation products, including generic drugs. The reduction in Quantbot's stake could signal a shift in investor sentiment around the company's prospects.

The details

According to a regulatory filing, Quantbot Technologies sold 31,192 shares of Amphastar Pharmaceuticals in the third quarter, leaving it with a position valued at $793,000 as of the end of the period. The move comes as Amphastar's stock has faced some volatility, with shares trading between $18.93 and $31.26 over the past 52 weeks.

  • Quantbot Technologies reduced its stake in Amphastar Pharmaceuticals in the third quarter of 2026.

The players

Quantbot Technologies LP

A hedge fund that has reduced its stake in Amphastar Pharmaceuticals.

Amphastar Pharmaceuticals, Inc.

A specialty pharmaceutical company that focuses on developing and manufacturing injectable and inhalation products, including generic drugs.

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The takeaway

The reduction in Quantbot's stake in Amphastar Pharmaceuticals could signal broader investor uncertainty around the company's prospects, as the stock has faced volatility in recent months. However, Amphastar remains a player in the generic drug market, and its future performance will be closely watched by investors.