InvestorLens

AMPH — AMPHASTAR PHARMACEUTICALS IN

Public company

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For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

About AMPHASTAR PHARMACEUTICALS IN (AMPH)

AMPHASTAR PHARMACEUTICALS IN (AMPH) appears in the most recent 13F filings of 3 tracked institutional investors. The largest disclosed position is held by Howard Marks (Oaktree Capital Management), valued at $34M. Across recent filings, tracked investors recorded 6 new positions, 0 increased, 0 reduced, and 1 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in AMPH

86
/100
Strong Institutional Accumulation
Added / Increased6
Reduced0
Exited1
BearishBullish
Crowded Trade Score™

How many top investors track AMPH

20
/100
Emerging Interest
3investors

A small number of top investors own this.

UndiscoveredCrowded
151015+

AMPH Ownership Composition

How AMPHASTAR PHARMACEUTICALS IN is held across tracked investor types, based on reported 13F positions.

Dominant Type
Hedge Funds
79% of tracked value
Institutions
3
tracked investors
Total Reported
$43.4M
combined 13F value
Sectors2
  • Hedge Funds79.4%
  • Other20.6%
Hedge Funds(1)
79.4%
Other(2)
20.6%

Tracked investors reporting AMPH

  • Howard MarksMar 31, 2026
    Oaktree Capital Management
    Shares
    38M
    Value
    $34.5M
    % Portfolio
    0.53%
  • Izzy EnglanderMar 31, 2026
    Millennium Management
    Shares
    371.4K
    Value
    $7.3M
    % Portfolio
    0.00%
  • Ken GriffinMar 31, 2026
    Citadel Advisors
    Shares
    85.4K
    Value
    $1.7M
    % Portfolio
    0.00%

Recent activity

Frequently asked questions

How many institutional investors hold AMPH?
3 tracked institutional investors disclosed a position in AMPH (AMPHASTAR PHARMACEUTICALS IN) in their most recent 13F filing.
Who is the largest institutional holder of AMPH?
Howard Marks, Oaktree Capital Management, holds the largest disclosed position in AMPH, valued at $34M.
Did institutional ownership of AMPH increase or decrease?
Across recent 13F filings, tracked investors recorded 6 new positions, 0 increased, 0 reduced, and 1 fully exited AMPH.
Where does this AMPH ownership data come from?
SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.