O'Shaughnessy Asset Management’s Amphastar Pharmaceuticals AMPH Stock Holding History

O'Shaughnessy Asset Management’s Portfolio AMPH Stock Details AMPH Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q3	$5.57M	Buy	198,920 +39,493	+25%	+$854K	0.02%	561
2026 Q2	$3.22M	Buy	159,427 +55,498	+53%	+$1.12M	0.01%	709
2026 Q1	$2.04M	Buy	103,929 +16,746	+19%	+$410K	0.01%	867
2025 Q4	$2.33M	Buy	87,183 +18,125	+26%	+$467K	0.01%	773
2025 Q3	$1.84M	Buy	69,058 +28,749	+71%	+$742K	0.01%	861
2025 Q2	$925K	Buy	+40,309	New	+$1M	0.01%	1088
2024 Q1	–	Sell	-4,228	Closed	-$262K	–	1876
2023 Q4	$262K	Buy	+4,228	New	+$222K	﹤0.01%	1274
2020 Q1	–	Sell	-143	Closed	-$3K	–	1304
2019 Q4	$3K	Buy	+143	New	+$2.74K	﹤0.01%	1551

Other funds holding AMPH

Dimensional Fund Advisors Austin, Texas $551B AUM 33.95% 1-Year Est. Return

State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return

American Century Companies Kansas City, Missouri $229B AUM 33.35% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return

LSV Asset Management Chicago, Illinois $54.1B AUM 39.29% 1-Year Est. Return

Renaissance Technologies New York $73.4B AUM 32.8% 1-Year Est. Return

Bridge City Capital Lake Oswego, Oregon $480M AUM 47.16% 1-Year Est. Return

First Trust Advisors Wheaton, Illinois $170B AUM 38.25% 1-Year Est. Return

Principal Financial Group Des Moines, Iowa $195B AUM 21.17% 1-Year Est. Return

Bank of New York Mellon New York $608B AUM 32.77% 1-Year Est. Return

O'Shaughnessy Asset Management's AMPH Position: Q3 2026 in Review

O'Shaughnessy Asset Management increased its Amphastar Pharmaceuticals (AMPH) stake by 25% in Q3 2026, buying an estimated $854K and bringing the position to 198,920 shares worth $5.57M. The position accounts for 0.02% of the portfolio, ranked #561.

O'Shaughnessy Asset Management first reported a position in AMPH in Q4 2019 and has held it in 8 quarters since. 143 funds tracked by Wall St. Rank hold AMPH as of Q3 2026.

O'Shaughnessy Asset Management held 198,920 shares of Amphastar Pharmaceuticals worth $5.57M as of Q3 2026.
O'Shaughnessy Asset Management bought 39,493 Amphastar Pharmaceuticals shares in Q3 2026, an estimated $854K.
Amphastar Pharmaceuticals made up 0.02% of O'Shaughnessy Asset Management's portfolio in Q3 2026, its #561 holding.
O'Shaughnessy Asset Management first reported a position in Amphastar Pharmaceuticals in Q4 2019 and has held it in 8 quarters since.
143 funds tracked by Wall St. Rank held Amphastar Pharmaceuticals as of Q3 2026.

Based on O'Shaughnessy Asset Management's 13F filing for Q3 2026, filed 12 Nov 2026.