¨ | Preliminary Proxy Statement | |||||||||||||
¨ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) | |||||||||||||
¨ | Definitive Proxy Statement | |||||||||||||
þ | Definitive Additional Materials | |||||||||||||
¨ | Soliciting Material Pursuant to §240.14a-12 | |||||||||||||
SPOK HOLDINGS, INC. | ||||||||||||||
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