Who Owns AMPH?
Amphastar Pharmaceuticals, Inc. — Institutional Ownership & 13F Holdings
$21.67
+0.27 (+1.24%)
Market Cap
$953.2M
Shares Outstanding
45,370,200
Institutional Holders
238
Total Inst. Value
$79.1B
% of Float Held
98.8%
QoQ Holder Change
+32
Institutional data as of Q1 2025
New Positions
43
Closed Positions
51
Increased
79
Decreased
91
Institutional Ownership Trend
Top 10 Institutional Holders(Q1 2025)
| # | Fund | Value | Shares |
|---|---|---|---|
| 1 | CANADA PENSION PLAN INVESTMENT BOARD | $78.3B | 2,700 |
| 2 | BlackRock, Inc. | $178.2M | 6,147,658 |
| 3 | VANGUARD GROUP INC | $70.2M | 2,422,904 |
| 4 | STATE STREET CORP | $46.5M | 1,604,614 |
| 5 | DIMENSIONAL FUND ADVISORS LP | $39.3M | 1,356,360 |
| 6 | FULLER & THALER ASSET MANAGEMENT, INC. | $36.6M | 1,263,598 |
| 7 | Epoch Investment Partners, Inc. | $36.6M | 1,261,307 |
| 8 | Boston Trust Walden Corp | $35.2M | 1,215,624 |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | $27.7M | 955,076 |
| 10 | NORTHERN TRUST CORP | $17.2M | 594,437 |
Biggest Buyers & Sellers This Quarter
Top Buyers
| Fund | Shares Added | Value |
|---|---|---|
| CANADA PENSION PLAN INVESTMENT BOARD | +3K | $78.3B |
| BlackRock, Inc. | +30K | $178.2M |
| STATE STREET CORP | +9K | $46.5M |
| DIMENSIONAL FUND ADVISORS LP | +158K | $39.3M |
| FULLER & THALER ASSET MANAGEMENT, INC. | +131K | $36.6M |
Top Sellers
| Fund | Shares Removed | Value |
|---|---|---|
| Pacer Advisors, Inc. | -871K | $15K |
| BESSEMER GROUP INC | -488K | $17K |
| VANGUARD GROUP INC | -292K | $70.2M |
| FEDERATED HERMES, INC. | -238K | $17.0M |
| AMERICAN CENTURY COMPANIES INC | -164K | $8.9M |
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Frequently Asked Questions
How many institutional investors hold AMPH?
As of Q1 2025, 238 institutional investors report holding AMPH (Amphastar Pharmaceuticals, Inc.) in their 13F filings.
What percentage of Amphastar Pharmaceuticals, Inc. is owned by institutions?
Institutional investors hold approximately 98.8% of Amphastar Pharmaceuticals, Inc.'s float as reported in SEC 13F filings.
Which hedge fund owns the most AMPH?
The largest institutional holder of AMPH is CANADA PENSION PLAN INVESTMENT BOARD with $78.3B in shares.
Are institutions buying or selling AMPH?
This quarter, 43 institutions opened new positions in AMPH and 51 closed their positions.
What is 13F institutional ownership?
SEC Form 13F is a quarterly report filed by institutional investment managers with over $100M in qualifying assets. It discloses their US equity holdings, providing transparency into what the largest investors are buying and selling.
How often is institutional ownership data updated?
13F filings are due 45 days after each calendar quarter end (May 15, Aug 14, Nov 14, Feb 14). Data is updated on HedgeTrace as new filings are processed.