Harmonic

Harmonic is a dynamic data provider that specializes in fast-growing start-up data. The data points you can filter by from Harmonic are unique and it's a great option for layering on highly specific filters to a broader audience.  
Recommended Filters:
Change in Headcount over a set period of time
Funding Data
Social Growth (Facebook, Instagram, Twitter followers, etc.)

Apollo

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Last modified 3mo ago