UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): September 13, 2018

Aerojet Rocketdyne Holdings, Inc.

(Exact name of registrant as specified in charter)

Registrant’s telephone number, including area code: (310) 252-8100

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

As previously disclosed by Aerojet Rocketdyne Holdings, Inc. (the “Company”) in a press release issued September 5, 2018, the Company’s Chief Executive Officer and President, Eileen Drake, is presenting at the G.research 24th Annual Aerospace & Defense Conference (the “Conference”) starting at 9 a.m. EDT on September 13, 2018. A live webcast of the presentation is accessible through the Company’s website at http://ir.aerojetrocketdyne.com/events-and-presentations and will be archived for a period of 90 days. The Company’s conference presentation slides are hereby furnished as Exhibit 99.1 to, and incorporated by reference into Item 7.01 of, this Current Report.

The information set forth in this Item 7.01 and attached as Exhibit 99.1 to this Current Report is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of such section, and it shall not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

As disclosed in Exhibit 99.1, the conference presentation slides contain forward-looking statements within the meaning of the federal securities laws. These statements reflect the present expectations of the Company’s management, and are subject to the limitations listed therein and in the Company’s other SEC reports, including that actual events or results may differ materially from those in the forward-looking statements. The Company undertakes no duty or obligation to publicly update or revise the information contained in such slides.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.