Evaluating only Sizmek’s profile at its peak — without knowing the outcome — the model ranked Competition as the #1 likely cause. That’s exactly how it died.
Key Events Timeline
FOUNDING
Sizmek founded
PIVOT
Strategic pivot under pressure
SHUTDOWN
Slow Death: Sizmek ceases operations
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Documented cause
Sizmek was one of the largest independent ad-serving and data platforms outside the Google-Facebook duopoly, handling display, video, and rich-media campaigns for thousands of advertisers. As the two platforms expanded walled-garden measurement tools, advertisers lost the ability to justify independent attribution spend. Sizmek filed Chapter 11 in April 2019; Amazon acquired the DSP technology and Zeta Global took the data assets.