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Amphastar Pharmaceuticals

241 hedge funds and large institutions have $964M invested in Amphastar Pharmaceuticals in 2025 Q1 according to their latest regulatory filings, with 32 funds opening new positions, 80 increasing their positions, 95 reducing their positions, and 50 closing their positions.

New
Increased
Maintained
Reduced
Closed

90% more call options, than puts

Call options by funds: $637K | Put options by funds: $336K

3.39% less ownership

Funds ownership: 73.14%69.75% (-3.4%)

8% less funds holding

Funds holding: 263241 (-22)

16% less repeat investments, than reductions

Existing positions increased: 80 | Existing positions reduced: 95

26% less capital invested

Capital invested by funds: $1.31B → $964M (-$342M)

36% less first-time investments, than exits

New positions opened: 32 | Existing positions closed: 50

100% less funds holding in top 10

Funds holding in top 10: 10 (-1)

Holders
241
Holders Change
-22
Holders Change %
-8.37%
% of All Funds
3.23%
Holding in Top 10
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-100%
% of All Funds
New
32
Increased
80
Reduced
95
Closed
50
Calls
$637K
Puts
$336K
Net Calls
+$301K
Net Calls Change
-$398K
Name Holding Trade Value Shares
Change
Change in
Stake
California State Teachers Retirement System (CalSTRS)
76
California State Teachers Retirement System (CalSTRS)
California
$1.05M
N
77
Numerai
California
$986K +$1.09M +34,006 New
AWA
78
Arkadios Wealth Advisors
Georgia
$985K +$192K +6,002 +21%
AC
79
Aristeia Capital
Connecticut
$981K -$300K -9,400 -22%
Connor, Clark & Lunn Investment Management (CC&L)
80
Connor, Clark & Lunn Investment Management (CC&L)
British Columbia, Canada
$935K -$1.12M -35,126 -52%
HSA
81
Hussman Strategic Advisors
Maryland
$913K +$1.01M +31,500 New
Canada Life
82
Canada Life
Manitoba, Canada
$907K -$121K -3,783 -11%
Deutsche Bank
83
Deutsche Bank
Germany
$896K -$101K -3,172 -9%
PCM
84
Polaris Capital Management
Massachusetts
$893K +$201K +6,300 +26%
LCM
85
Legato Capital Management
California
$861K +$359K +11,238 +61%
Raymond James Financial
86
Raymond James Financial
Florida
$860K -$2.02M -63,232 -68%
Wells Fargo
87
Wells Fargo
California
$851K +$186K +5,809 +25%
D.E. Shaw & Co
88
D.E. Shaw & Co
New York
$846K -$2.86M -89,663 -75%
Thrivent Financial for Lutherans
89
Thrivent Financial for Lutherans
Minnesota
$799K -$46K -1,441 -5%
IIM
90
Illumine Investment Management
Washington
$769K +$303K +9,481 +56%
GCM
91
Graham Capital Management
Connecticut
$766K +$844K +26,424 New
Royal Bank of Canada
92
Royal Bank of Canada
Ontario, Canada
$756K -$81.5K -2,553 -9%
State of Wisconsin Investment Board
93
State of Wisconsin Investment Board
Wisconsin
$742K -$1.82K -57 -0.2%
AO
94
Advisor OS
Illinois
$736K
MAM
95
Martingale Asset Management
Massachusetts
$711K -$500K -15,663 -39%
New York State Teachers Retirement System (NYSTRS)
96
New York State Teachers Retirement System (NYSTRS)
New York
$692K
MIM
97
MetLife Investment Management
New Jersey
$669K -$11.5K -359 -2%
Mirae Asset Global ETFs Holdings
98
Mirae Asset Global ETFs Holdings
Hong Kong
$652K +$19.6K +613 +3%
Tudor Investment Corp
99
Tudor Investment Corp
Connecticut
$632K +$696K +21,793 New
QT
100
Quantbot Technologies
New York
$612K -$139K -4,345 -17%

AMPH Hedge Fund Activity: Q1 2025 in Review

241 of the 7,457 institutional investors tracked by Wall St. Rank reported a position in Amphastar Pharmaceuticals (AMPH) for Q1 2025, worth a combined $964M — down 26% from $1.31B a quarter earlier.

Sellers outnumbered buyers: 50 funds closed out of AMPH and 32 opened new positions — a net loss of 18 holders — while 95 trimmed existing stakes and 80 added.

The largest buyer was Millennium Management, adding an estimated $19.5M. The largest seller was Neuberger Berman Group, exiting entirely with an estimated $51M sold.

  • 241 institutional investors held Amphastar Pharmaceuticals (AMPH) as of Q1 2025, down from 263 in Q4 2024.
  • Funds reported $964M of Amphastar Pharmaceuticals stock for Q1 2025, down 26% quarter-over-quarter.
  • 32 funds opened new Amphastar Pharmaceuticals positions in Q1 2025 and 50 closed out, a net change of -18 holders.
  • The largest Amphastar Pharmaceuticals buyer in Q1 2025 was Millennium Management, an estimated $19.5M added.
  • The largest Amphastar Pharmaceuticals seller in Q1 2025 was Neuberger Berman Group, an estimated $51M sold.

Based on aggregated 13F filings for Q1 2025.