13D Filing: Starboard Value LP and Comscore Inc. (SCOR)

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SIGNATURES

After reasonable inquiry
and to the best of his knowledge and belief, each of the undersigned certifies that the information set forth in this statement
is true, complete and correct.

Dated: January 17, 2018

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD

By: Starboard Value LP,

its investment manager

Starboard Value
and Opportunity S LLC

By: Starboard Value LP,

its manager

Starboard Value
and Opportunity C LP

By: Starboard Value R LP,

its general partner

STARBOARD VALUE R LP

By: Starboard Value R GP LLC,

its general partner

STARBOARD VALUE LP

By: Starboard Value GP LLC,

its general partner

STARBOARD VALUE GP LLC

By: Starboard Principal Co LP,

its member

STARBOARD PRINCIPAL CO LP

By: Starboard Principal Co GP LLC,

its general partner

STARBOARD PRINCIPAL CO GP LLC

Starboard Value R GP
LLC

By: /s/ Jeffrey C. Smith
Name: Jeffrey C. Smith
Title: Authorized Signatory

/s/ JEFFREY C. SMITH

Jeffrey C. Smith
Individually and as attorney-in-fact for Mark R. Mitchell and Peter A. Feld

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