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Most Shorted Highest short interest
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13F Activity

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Latest Filings Newest 13F submissions
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Conviction Heat Map Crowded positions at a glance

Markets

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Congress Leaderboard Members ranked by portfolio performance

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Stocks

AI Stock Screener ALVIS

Short interest & flow

Most Shorted Squeeze Risk Largest Short Volume Highest Off-Exchange Share

Ownership & fundamentals

Insider Sentiment Largest Buybacks Going-Concern Flags

Institutions

Filers & Rankings

Browse Filers Top by AUM Smart Money Index Superinvestors AUM Movers Most-Held Stocks Last Quarter's Movers Overlap Matrix Clone Backtest Beneficial Ownership

13F Activity

13F Statistics Latest Filings 13F Trends Double-Down Report Conviction Heat Map

Markets

Insider Trading Funds & ETFs Investment Advisers Economic Data Economic Calendar FDA Calendar Congress Net Worth Congress Leaderboard

Stocks
AMPH
DEF 14A

DEF 14A

Amphastar Pharmaceuticals, Inc. (AMPH)

DEF 14A 2026-04-13 For: 2026-06-01

Added on June 12, 2026

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