Amphastar Pharmaceuticals

AMPH • NASDAQ

Amphastar Pharmaceuticals is a drug manufacturers - specialty & generic company in the healthcare sector on NASDAQ, led by Jack Yongfeng Zhang, with a market cap of $1.2B. As of Q3 2025, 70% of shares are held by 238 institutional investors, with BlackRock, Inc. as the largest holder at 11.8%.

Chief Executive Officer, Chief Scientific Officer, President, and Board MemberJack Yongfeng Zhang

Market Cap$1.2B

Drug Manufacturers - Specialty & Generic

Healthcare

Employees1.8K

Websiteamphastar.com

Country

United States of America

Overview

Overview of institutional ownership in AMPH as of Q3 2025 with a market cap of $1.2B

All Institutions

Institutions: 238
Value Held: $872.1M
Shares Held: 32.7M
Avg Position: $3.7M
Median Position: $372.6K

Hedge Funds

Hedge Funds: 19
Value Held: $82.8M
Shares Held: 3.1M
Avg Position: $4.4M
Median Position: $1.3M

Ownership Breakdown

Institutional (non-HF)

63.7%

$789.3M

Hedge Funds

6.68%

$82.8M

Retail & Other

29.62%

$367.0M

Based on market cap of $1.2B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in AMPH as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
B BlackRock, Inc. Institution	-	$146.2M 0.00% of portfolio	11.80% 5.5M shares	Q2 2015 Held for 10y 5m	$5.67T
VANGUARD GROUP INC Institution	Salim Ramji CEO	$70.1M 0.00% of portfolio	5.66% 2.6M shares	Q3 2014 Held for 11y 2m	$6.69T
T TD ASSET MANAGEMENT INC Institution	-	$51.5M 0.04% of portfolio	4.16% 1.9M shares	Q1 2023 Held for 2y 8m	$123.47B
DIMENSIONAL FUND ADVISORS LP Long Only Manager	David Paul Butler CEO	$46.8M 0.01% of portfolio	3.78% 1.8M shares	Q4 2015 Held for 9y 11m	$466.32B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$40.0M 0.00% of portfolio	3.23% 1.5M shares	Q3 2014 Held for 11y 2m	$2.88T
FULLER & THALER ASSET MANAGEMENT, INC. Long Only Manager	Raife Brandon Giovinazzo Managing Partner	$36.1M 0.12% of portfolio	2.91% 1.4M shares	Q2 2020 Held for 5y 5m	$29.4B
B BTIM Corp. Institution	-	$31.3M 0.23% of portfolio	2.52% 1.2M shares	Q3 2024 Held for 1y 2m	$13.6B
Epoch Investment Partners, Inc. Long Only Manager	Bruce Cooper CEO	$30.2M 0.17% of portfolio	2.44% 1.1M shares	Q2 2023 Held for 2y 5m	$18.2B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$24.6M 0.00% of portfolio	1.98% 922.6K shares	Q3 2014 Held for 11y 2m	$1.57T
Marshall Wace LLP Institution	Diana Lj Harrison President	$23.3M 0.03% of portfolio	1.88% 874.1K shares	Q2 2024 Held for 1y 5m	$90.3B

Net Capital Flow

Institutional buying and selling activity for AMPH in Q3 2025

Traded: +$11.5M
Buyers: 114
Sellers: 123
Total Bought: +$96.8M
Total Sold: −$85.3M
Avg Position: $3.2M

Biggest Buyers

Institution	Net Bought	Current Position
ARROWSTREET CAPITAL LIMITED PARTNERSHIP Hedge Fund•Quant	+$8.3M +311.1K shares	$10.5M 392.3K shares
Clark Capital Management Group, Inc. RIA/Wealth	+$7.6M +283.7K shares	$7.6M 283.7K shares
ALGERT COLDIRON INVESTORS LLC Hedge Fund•Quant	+$7.2M +268.6K shares	$10.5M 392.9K shares
UBS Group AG Institution	+$6.5M +245.4K shares	$8.3M 312.3K shares
B BRIDGEWAY CAPITAL MANAGEMENT INC Long Only Manager	+$6.1M +227.2K shares	$8.3M 312.3K shares
D D. E. Shaw & Co., Inc. Institution	+$6.0M +223.3K shares	$13.8M 517.2K shares
B BNP PARIBAS ARBITRAGE, SA Institution	+$4.0M +150.3K shares	$5.9M 222.0K shares
DENALI ADVISORS LLC Long Only Manager	+$3.6M +135.0K shares	$3.6M 135.0K shares
VICTORY CAPITAL MANAGEMENT INC Long Only Manager	+$3.6M +134.9K shares	$5.6M 211.8K shares
R RICE HALL JAMES & ASSOCIATES, LLC Long Only Manager	+$3.4M +129.3K shares	$3.4M 129.3K shares

Biggest Sellers

Institution	Net Sold	Current Position
R ROYAL BANK OF CANADA Institution	−$7.2M −269.0K shares	$1.3M 49.7K shares
Q Qube Research & Technologies Ltd Institution	−$6.1M −228.3K shares	$6.4M 241.2K shares
CX Institutional RIA/Wealth	−$5.3M −200.0K shares	$1.7M 63.3K shares
B BlackRock, Inc. Institution	−$4.9M −183.7K shares	$146.2M 5.5M shares
Trexquant Investment LP Hedge Fund•Quant	−$3.6M −155.2K shares	Sold Off 0 shares
BALYASNY ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	−$3.3M −124.5K shares	$3.8M 141.9K shares
GOLDMAN SACHS GROUP INC Institution	−$3.1M −115.0K shares	$6.4M 241.2K shares
Epoch Investment Partners, Inc. Long Only Manager	−$2.9M −107.4K shares	$30.2M 1.1M shares
MORGAN STANLEY RIA/Wealth	−$2.8M −106.5K shares	$15.3M 574.7K shares
T TD ASSET MANAGEMENT INC Institution	−$2.7M −103.0K shares	$51.5M 1.9M shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited AMPH in Q3 2025

New Positions: 10
New Value: $5.4M
Exited Positions: 33
Exited Value: $22.5M

New Positions

Institution	Position Value
R RICE HALL JAMES & ASSOCIATES, LLC Long Only Manager	$3.4M 129.3K shares
SummerHaven Investment Management, LLC Long Only Manager	$1.0M 38.2K shares
Lighthouse Investment Partners, LLC Fund of Funds	$575.6K 21.6K shares
Round Rock Advisors, LLC RIA/Wealth	$212.1K 8.6K shares
WOLVERINE ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	$126.4K 4.7K shares
S Salomon & Ludwin, LLC Institution	$10.1K 377.0 shares
O Optiver Holding B.V. Institution	$3.9K 146.0 shares
Sontag Advisory, LLC RIA/Wealth	$1.9K 70.0 shares
H Hughes Financial Services, LLC RIA/Wealth	$627.0 24.0 shares
Sunbelt Securities, Inc. RIA/Wealth	$586.0 22.0 shares

Exited Positions

Institution	Previous Position
Trexquant Investment LP Hedge Fund•Quant	$3.6M 155.2K shares
T TWINBEECH CAPITAL LP Hedge Fund•Quant	$2.0M 88.5K shares
J Jump Financial, LLC Institution	$1.5M 63.3K shares
GSA CAPITAL PARTNERS LLP Hedge Fund•Quant	$1.3M 57.1K shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$1.3M 54.6K shares
T TEXAS PERMANENT SCHOOL FUND Institution	$1.3M 54.5K shares
Engineers Gate Manager LP Hedge Fund•Quant	$1.2M 53.3K shares
Aurora Investment Counsel RIA/Wealth	$1.2M 53.3K shares
CAPITAL FUND MANAGEMENT S.A. Hedge Fund•Quant Macro	$931.5K 40.6K shares
Edgestream Partners, L.P. Hedge Fund•Quant Macro	$852.1K 37.1K shares

Options Activity

Institutions with the largest Call and Put options positions in AMPH as of Q3 2025

Call Positions: 2
Call Value: $2.0M
Put Positions: 2
Put Value: $335.8K

Call Positions

Institution	Position Value
J JANE STREET GROUP, LLC Institution	$1.6M 583.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$402.4K 151.0 contracts

Put Positions

Institution	Position Value
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$317.1K 119.0 contracts
WOLVERINE ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	$18.7K 7.0 contracts

Most Committed Institutions

Institutions with AMPH as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
LAM GROUP, INC. RIA/Wealth	John Andrew Marcelia CEO	2.16% $3.5M	0.28% 130.8K shares	Q4 2022 Held for 2y 11m	$161.3M
Bridge City Capital, LLC Long Only Manager	Alexander Jackson Woodward President	0.97% $3.6M	0.29% 136.3K shares	Q2 2023 Held for 2y 5m	$374.5M
Q Quantedge Capital Pte Ltd Institution	-	0.66% $1.2M	0.10% 45.1K shares	Q3 2025 Held for 2 months	$182.7M
SummerHaven Investment Management, LLC Long Only Manager	Kurt Jonathon Nelson CEO	0.60% $1.0M	0.08% 38.2K shares	Q3 2025 Held for 2 months	$170.9M
Illumine Investment Management, LLC RIA/Wealth	Amanda K Holloway CCO	0.53% $737.6K	0.06% 27.7K shares	Q4 2024 Held for 11 months	$140.3M
DENALI ADVISORS LLC Long Only Manager	Robert Guenther Snigaroff CIO	0.41% $3.6M	0.29% 135.0K shares	Q3 2025 Held for 2 months	$885.1M
SYSTEMATIC FINANCIAL MANAGEMENT LP Long Only Manager	Kenneth Burgess CIO	0.27% $11.3M	0.91% 423.1K shares	Q4 2024 Held for 11 months	$4.1B
Significant Wealth Partners LLC RIA/Wealth	Brian William Atkins President	0.27% $548.4K	0.04% 20.6K shares	Q4 2024 Held for 11 months	$204.6M
B BTIM Corp. Institution	-	0.23% $31.3M	2.52% 1.2M shares	Q3 2024 Held for 1y 2m	$13.6B
R RICE HALL JAMES & ASSOCIATES, LLC Long Only Manager	Thomas W Mcdowell Chairman	0.19% $3.4M	0.28% 129.3K shares	Q3 2025 Held for 2 months	$1.8B

Hedge Fund Spotlight

Discover hedge funds investing in AMPH

WOLVERINE ASSET MANAGEMENT LLC

Hedge Fund • Multi-Strategy

Portfolio ManagerChristopher Lazarus Gust

Portfolio Value: $1.5B
Positions: 859
Last Reported: Q3 2025

Sector Allocation

Position in Amphastar Pharmaceuticals

Market Value: $126.4K
Shares Held: 4.7K
Portfolio Weight: 0.01%
Owned Since: 2025-Q2

Top Holding	Sector	Market Value	Weight
1 BTSGU BrightSpring Health Services BTSGU	Medical - Healthcare Information Services Healthcare	$56.2M	3.82%
2 iShares Bitcoin Trust IBIT	ETF ETF	$36.0M	2.45%
3 AAM AA Mission Acquisition Corp. AAM	Unknown Unknown	$26.9M	1.83%

View full profile

Amphastar Pharmaceuticals

Overview

All Institutions

Hedge Funds

Ownership Breakdown

Biggest Investors

Net Capital Flow

Biggest Buyers

Biggest Sellers

Entry and Exit Activity

New Positions

Exited Positions

Options Activity

Call Positions

Put Positions

Most Committed Institutions

Hedge Fund Spotlight

Position in Amphastar Pharmaceuticals

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