UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities

Exchange Act of 1934

Filed by the Registrantþ

Filed by a Party other than the Registranto

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oPreliminary Proxy Statement

oConfidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

oDefinitive Proxy Statement

þDefinitive Additional Materials

oSoliciting Material Under §240.14a-12

Aerojet Rocketdyne Holdings, 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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þNo fee required.

oFee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

	1) Title of each class of securities to which transaction applies:
	2) Aggregate number of securities to which transaction applies:
	3) Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):
	4) Proposed maximum aggregate value of transaction:
	5) Total fee paid:
o	Fee paid previously with preliminary materials.
o	Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.
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