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Of the 10 tracked institutions holding AMPH, 4 have a 3-year clone track record — 4 of them beat the S&P. Average holder's clone alpha: +5.9pt. It's a gauge of who owns the name, not just how many.
Among the 10 tracked institutional investors we monitor, AMPH (AMPHASTAR PHARMACEUTICALS IN) is held with a combined value of $229.62M across 10,764,039 shares. The largest holder is BlackRock, Inc. with a position worth $106.20M. Magnetar Financial LLC opened a new position in the most recent quarter. 5 funds increased their holdings. 4 funds reduced their position.
Total Institutional Value
$229.62M
Total Shares Held
10,764,039
Institutional Holders
10
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | BlackRock, Inc. | $106.20M | 0.00% | -0.7% |
| 2 | VANGUARD GROUP INC | $69.85M | 0.00% | -0.9% |
| 3 | STATE STREET CORP | $31.49M | 0.00% | +4.9% |
| 4 | RENAISSANCE TECHNOLOGIES LLC | $10.85M | 0.02% | +1.7% |
| 5 | MILLENNIUM MANAGEMENT LLC | $7.28M | 0.00% | +27.8% |
| 6 | AQR CAPITAL MANAGEMENT LLC | $1.54M | 0.00% | +16.4% |
| 7 | CITADEL ADVISORS LLC | $1.28M | 0.00% | -71.3% |
| 8 | PRICE T ROWE ASSOCIATES INC /MD/ | $880.00K | 0.00% | +22.0% |
| 9 | Magnetar Financial LLC | $220.09K | 0.00% | New |
| 10 | FMR LLC | $25.35K | 0.00% | -63.3% |
As of the latest SEC 13F filings, BlackRock, Inc. is the largest institutional holder of AMPH with a position worth $106.20M, representing 0.00% of their portfolio. In total, 10 institutional investors hold AMPH with a combined value of $229.62M.
In the most recent quarter, 1 fund opened a new position in AMPH. Additionally, 5 increased their holdings and 4 reduced their positions.
Institutional investors hold $229.62M worth of AMPH stock across 10 positions. The largest institutional holder is BlackRock, Inc. with $106.20M in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For AMPH, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their AMPH positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
Last Close
$18.72
2026-07-24
YTD
-29.3%
13% of 52-week range
