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Short interest & flow

Most Shorted Highest short interest
Squeeze Risk Composite short-squeeze score
Largest Short Volume Daily short-volume leaders
Highest Off-Exchange Share Dark-pool / OTC volume leaders

Ownership & fundamentals

Insider Sentiment Where insiders are accumulating most
Largest Buybacks Biggest share-repurchase programs
Going-Concern Flags Companies disclosing going-concern doubt

Institutions

Filers & Rankings

Browse Filers All 13F institutional filers
Top by AUM Largest filers by assets
Smart Money Index Top funds' highest-conviction basket
Superinvestors Famous value investors' portfolios
AUM Movers Biggest assets-under-management swings
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Last Quarter's Movers Notable position changes
Overlap Matrix Compare filer portfolios side by side
Clone Backtest Backtest a combined clone of several filers
Beneficial Ownership Recent 13D / 13G >5% stakes

13F Activity

13F Statistics Aggregate filing statistics
Latest Filings Newest 13F submissions
13F Trends Sector and flow trends
Double-Down Report Increased-conviction buys
Conviction Heat Map Crowded positions at a glance

Markets

Insider Trading Corporate insider buys and sells
Funds & ETFs Registered funds and ETFs from Form NPORT-P
Investment Advisers SEC-registered Form ADV firms
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FDA Calendar Upcoming FDA advisory-committee meetings
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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
SPOK
8-K

8-K

Spok Holdings, Inc (SPOK)

8-K 2021-02-17 For: 2021-02-17

Added on April 11, 2026

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