Amphastar Pharmaceuticals, Inc. (AMPH) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

0Shares Outstanding

528,695Shares held by institutions

$10,158,874Value of institutional holdings

67.65%Institutional ownership %

-0.40%Shares Changed QoQ

241No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Amphastar Pharmaceuticals, Inc. (NASDAQ:AMPH) is held by 229 institutional investors per 13F filings through December 2025.

These investors held 73.6% of outstanding shares in December 2025, up from 69.4% in September 2025.
They increased total shares held in Amphastar Pharmaceuticals by 8.23% from last quarter, and the number of investors in AMPH decreased 11.92% annually.
Of these 229 funds, 116 grew their exposure to Amphastar Pharmaceuticals, 85 cut back, and 28 maintained positions.
Altogether, these fund groups held 35.08Mn shares in AMPH by December 2025, up by 2.67Mn shares quarter on quarter, and up 676.05K shares year over year.
As of December 31, 2025, BlackRock, Inc. held the largest stake in Amphastar Pharmaceuticals with 5.46Mn shares, accounting for 11.46% of total shares outstanding.
The most significant purchases of AMPH for the quarter ending December 2025 came from FULLER & THALER ASSET MANAGEMENT, INC. (1.43Mn), AMERICAN CENTURY COMPANIES INC (376.75K), MARSHALL WACE, LLP (363.22K), Goldman Sachs Group Inc (315.48K), Empowered Funds, LLC (182.02K).
Leading sellers of Amphastar Pharmaceuticals shares for the quarter ending December 2025 were MILLENNIUM MANAGEMENT LLC (407.09K), Jpmorgan Chase & Co (347.82K), ALGERT GLOBAL LLC (267.77K), Qube Research & Technologies Ltd (129.77K), Bank Of America Corp /De/ (126.02K).
Amphastar Pharmaceuticals's 10 largest shareholders as of December 2025 include BlackRock, Inc. (5.46Mn), FULLER & THALER ASSET MANAGEMENT, INC. (2.79Mn), VANGUARD GROUP INC (2.61Mn), TD ASSET MANAGEMENT INC (1.96Mn), DIMENSIONAL FUND ADVISORS LP (1.8Mn), State Street Corp (1.53Mn), MARSHALL WACE, LLP (1.24Mn), Epoch Investment Partners, Inc. (1.13Mn), Boston Trust Walden Corp (1.09Mn), GEODE CAPITAL MANAGEMENT, LLC (886.82K) per Business Quant data.

229 Institutional Holders

528,695 Total Shares Held

Rows:

Download Data

Owner Name	Date	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	-23,042	-0.42%	$0.00
FULLER & THALER ASSET MANAGEMENT, INC.	31 Dec, 2025	1,434,999	105.99%	$0.00
UBS Group AG	31 Dec, 2025	-55,650	-17.82%	$0.00
Barclays Plc	31 Dec, 2025	-65,631	-46.56%	$0.00
VANGUARD GROUP INC	31 Dec, 2025	-22,882	-0.87%	$0.00
Bridge City Capital, LLC	31 Dec, 2025	99,227	72.82%	$0.00
Rockefeller Capital Management L.P.	31 Dec, 2025	-223	-52.72%	$0.00
TD ASSET MANAGEMENT INC	31 Dec, 2025	31,160	1.61%	$0.00
Pacer Advisors, Inc.	31 Dec, 2025	171,748	2,864.38%	$0.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	44,020	2.51%	$0.00
LAM GROUP, INC.	31 Dec, 2025	0	0.00%	$0.00
State Street Corp	31 Dec, 2025	31,044	2.07%	$0.00
Trexquant Investment LP	31 Dec, 2025	113,673	0.00%	$0.00
MARSHALL WACE, LLP	31 Dec, 2025	363,216	41.55%	$0.00
Qube Research & Technologies Ltd	31 Dec, 2025	-129,773	-53.80%	$0.00
Epoch Investment Partners, Inc.	31 Dec, 2025	-7,401	-0.65%	$0.00
Nuveen, LLC	31 Dec, 2025	-1,602	-2.06%	$0.00
Boston Trust Walden Corp	31 Dec, 2025	-85,841	-7.32%	$0.00
Susquehanna Portfolio Strategies, LLC	31 Dec, 2025	27,405	69.27%	$0.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	-35,752	-3.88%	$0.00

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