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Filed by a Party other than the Registrant | ☐ | |||||||||||||
| Check the appropriate box: | ||||||||
| ☐ | Preliminary Proxy Statement | |||||||
| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) | |||||||
| ☐ | Definitive Proxy Statement | |||||||
| ☒ | Definitive Additional Materials | |||||||
| ☐ | Soliciting Material under §240.14a-12 | |||||||

| DECIPHERA PHARMACEUTICALS, INC. | ||||||||||||||
| (Name of Registrant as Specified In Its Charter) | ||||||||||||||
(Name of Person(s) Filing Proxy Statement, if other than the Registrant) | ||||||||||||||
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| ☐ | Fee paid previously with preliminary materials. | |||||||||||||
| ☐ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11. | |||||||||||||

