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Amphastar Pharmaceuticals
AMPH

243 hedge funds and large institutions have $873M invested in Amphastar Pharmaceuticals in 2025 Q3 according to their latest regulatory filings, with 34 funds opening new positions, 82 increasing their positions, 92 reducing their positions, and 34 closing their positions.

New
Increased
Maintained
Reduced
Closed

427% more call options, than puts

Call options by funds: $2.01M | Put options by funds: $381K

16% more capital invested

Capital invested by funds: $752M → $873M (+$121M)

1.03% more ownership

Funds ownership: 69.41% → 70.43% (+1%)

0% more first-time investments, than exits

New positions opened: 34 | Existing positions closed: 34

1% less funds holding

Funds holding: 245 → 243 (-2)

11% less repeat investments, than reductions

Existing positions increased: 82 | Existing positions reduced: 92

Holders
243
Holders Change
-2
Holders Change %
-0.82%
% of All Funds
3.19%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
34
Increased
82
Reduced
92
Closed
34
Calls
$2.01M
Puts
$381K
Net Calls
+$1.63M
Net Calls Change
+$1.56M

Top Buyers

1
Arrowstreet Capital
Arrowstreet Capital
Massachusetts
+$8.03M
2
CCMG
Clark Capital Management Group
Pennsylvania
+$7.33M
3
AG
Algert Global
California
+$6.94M
4
UBS Group
UBS Group
Switzerland
+$6.34M
5
BCM
Bridgeway Capital Management
Texas
+$5.87M

Top Sellers

1
Pacer Advisors
Pacer Advisors
Pennsylvania
-$8.27M
2
Royal Bank of Canada
Royal Bank of Canada
Ontario, Canada
-$6.95M
3
Qube Research & Technologies (QRT)
Qube Research & Technologies (QRT)
United Kingdom
-$5.89M
4
CI
CX Institutional
Indiana
-$5.16M
5
BlackRock
BlackRock
New York
-$4.74M
Name Holding Trade Value Shares
Change 		Change in
Stake
CUAMC
151
China Universal Asset Management Company
China
$217K -$34K -1,318 -14%
OPERF
152
Oregon Public Employees Retirement Fund
Oregon
$214K -$10.3K -400 -5%
Pathstone Holdings
153
Pathstone Holdings
New Jersey
$213K +$206K +7,984 New
RRA
154
Round Rock Advisors
Connecticut
$212K +$222K +8,580 New
Commonwealth Equity Services
155
Commonwealth Equity Services
Massachusetts
$209K +$203K +7,860 New
Russell Investments Group
156
Russell Investments Group
United Kingdom
$204K +$176K +6,830 +818%
Zurich Cantonal Bank
157
Zurich Cantonal Bank
Switzerland
$200K – – –
KK
158
KLP Kapitalforvaltning
Norway
$197K – – –
Fidelity Investments
159
Fidelity Investments
Massachusetts
$172K -$18.9K -731 -10%
Pacer Advisors
160
Pacer Advisors
Pennsylvania
$160K -$8.27M -320,102 -98%
PNC Financial Services Group
161
PNC Financial Services Group
Pennsylvania
$147K -$24.6K -952 -15%
Public Employees Retirement Association of Colorado
162
Public Employees Retirement Association of Colorado
Colorado
$140K – – –
WAM
163
Wolverine Asset Management
Illinois
$126K +$122K +4,743 New
SOW
164
State of Wyoming
Wyoming
$88K +$14.9K +578 +21%
HFS
165
Hantz Financial Services
Michigan
$83K +$45.1K +1,745 +127%
AIP
166
Ameritas Investment Partners
Nebraska
$82.6K -$17.1K -661 -18%
QCG
167
Quadrant Capital Group
Ohio
$82K +$79.4K +3,076 New
Group One Trading
168
Group One Trading
Illinois
$55.2K +$53.5K +2,071 New
OC
169
Oakworth Capital
Alabama
$49.9K -$107K -4,126 -69%
Mirae Asset Global Investments
170
Mirae Asset Global Investments
South Korea
$47.9K -$594 -23 -1%
BTI
171
Blue Trust Inc
Georgia
$47.1K -$207 -8 -0.5%
PS
172
Principal Securities
Iowa
$42.7K +$41K +1,586 +8,811%
IA
173
IFP Advisors
Florida
$41.8K -$12K -465 -23%
Carson Wealth (CWM LLC)
174
Carson Wealth (CWM LLC)
Nebraska
$40K -$77.3K -2,994 -67%
SAM
175
Shell Asset Management
Netherlands
$40K -$69.2K -2,681 -64%
5 6
7
8 9

AMPH Hedge Fund Activity: Q3 2025 in Review

243 of the 7,619 institutional investors tracked by Wall St. Rank reported a position in Amphastar Pharmaceuticals (AMPH) for Q3 2025, worth a combined $873M — up 16% from $752M a quarter earlier.

Fund positioning in AMPH was balanced in Q3 2025: 34 funds opened new positions, 34 closed out, 82 added to existing stakes and 92 trimmed.

The largest buyer was Arrowstreet Capital, adding an estimated $8.03M. The largest seller was Pacer Advisors, cutting an estimated $8.27M.

  • 243 institutional investors held Amphastar Pharmaceuticals (AMPH) as of Q3 2025, down from 245 in Q2 2025.
  • Funds reported $873M of Amphastar Pharmaceuticals stock for Q3 2025, up 16% quarter-over-quarter.
  • 34 funds opened new Amphastar Pharmaceuticals positions in Q3 2025 and 34 closed out, a net change of 0 holders.
  • The largest Amphastar Pharmaceuticals buyer in Q3 2025 was Arrowstreet Capital, an estimated $8.03M added.
  • The largest Amphastar Pharmaceuticals seller in Q3 2025 was Pacer Advisors, an estimated $8.27M sold.

Based on aggregated 13F filings for Q3 2025.