Reprinted in a bunch of places, but originally from the Wall Street Journal, Starboard Takes 6.5% Stake Worth Around $800 Million in GoDaddy:

Activist investor Starboard Value LP has a sizable stake in GoDaddy Inc. and plans to push the domain registrar to boost its performance.
Starboard controls a roughly 6.5% stake in the company worth around $800 million, according to people familiar with the matter.

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There really aren’t many details beyond this but you can escape the paywall at Reuters.

Starboard Boards the GoDaddy Ship with $800 Million