SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549


SCHEDULE 13D

Under the Securities Exchange Act of 1934 (Amendment No. 51)


Aerojet Rocketdyne Holdings, Inc.
(previously filed under GenCorp Inc.)
(Name of Issuer)

Common Stock, $0.10 Par Value Per Share
(Title of Class of Securities)


___________________007800105___________________
(CUSIP Number)

David Goldman
GAMCO Investors, Inc.
One Corporate Center
Rye, New York 10580-1435
(914) 921-5000
 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)


______________________August 5, 2015________________________
(Date of Event which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box  .

1

CUSIP No. 007800105
1
Names of reporting persons
I.R.S. identification nos. of above persons (entities only)
Gabelli Funds, LLC                                I.D. No.  13-4044523
2
Check the appropriate box if a member of a group (SEE INSTRUCTIONS)  (a)
 
 
(b)
 
3
Sec use only
 
4
Source of funds (SEE INSTRUCTIONS)
    00-Funds of investment advisory clients
 
5
Check box if disclosure of legal proceedings is required pursuant to items 2 (d) or 2 (e)
 
 
6
Citizenship or place of organization
   New York
 
Number Of
 
Shares
 
Beneficially
 
Owned
 
By Each
 
Reporting
 
Person
 
With
: 7
:
:
:
Sole voting power
 
2,896,598  (Item 5)
: 8
:
:
:
Shared voting power
 
None
: 9
:
:
:
Sole dispositive power
 
2,896,598  (Item 5)
:10
:
:
:
Shared dispositive power
 
None
11
 
 
 
Aggregate amount beneficially owned by each reporting person
 
2,896,598  (Item 5)
12
 
 
 
Check box if the aggregate amount in row (11) excludes certain shares
(SEE INSTRUCTIONS)
13
 
 
 
Percent of class represented by amount in row (11)
 
4.57%
14
 
 
 
Type of reporting person (SEE INSTRUCTIONS)
    IA
 
2

 
CUSIP No. 007800105
1
Names of reporting persons
I.R.S. identification nos. of above persons (entities only)
GAMCO Asset Management Inc.    I.D. No.  13-4044521
2
Check the appropriate box if a member of a group (SEE INSTRUCTIONS)  (a)
 
 
(b)
 
3
Sec use only
 
4
Source of funds (SEE INSTRUCTIONS)
 00-Funds of investment advisory clients
 
5
Check box if disclosure of legal proceedings is required pursuant to items 2 (d) or 2 (e)
 
 
6
Citizenship or place of organization
   New York
 
Number Of
 
Shares
 
Beneficially
 
Owned
 
By Each
 
Reporting
 
Person
 
With
: 7
:
:
:
Sole voting power
 
4,773,919  (Item 5)
: 8
:
:
:
Shared voting power
 
None
: 9
:
:
:
Sole dispositive power
 
5,114,418  (Item 5)
:10
:
:
:
Shared dispositive power
 
None
11
 
 
 
Aggregate amount beneficially owned by each reporting person
 
5,114,418  (Item 5)
12
 
 
 
Check box if the aggregate amount in row (11) excludes certain shares
(SEE INSTRUCTIONS)
13
 
 
 
Percent of class represented by amount in row (11)
 
8.08%
14
 
 
 
Type of reporting person (SEE INSTRUCTIONS)
    IA, CO
 
3

 
CUSIP No. 007800105
1
Names of reporting persons
I.R.S. identification nos. of above persons (entities only)
Teton Advisors, Inc.                                             I.D. No.  13-4008049
2
Check the appropriate box if a member of a group (SEE INSTRUCTIONS)  (a)
 
 
(b)
 
3
Sec use only
 
4
Source of funds (SEE INSTRUCTIONS)
00 – Funds of investment advisory clients
 
5
Check box if disclosure of legal proceedings is required pursuant to items 2 (d) or 2 (e)
 
 
6
Citizenship or place of organization
   Delaware
 
Number Of
 
Shares
 
Beneficially
 
Owned
 
By Each
 
Reporting
 
Person
 
With
: 7
:
:
:
Sole voting power
 
1,218,900     (Item 5)
: 8
:
:
:
Shared voting power
 
None
: 9
:
:
:
Sole dispositive power
 
1,218,900     (Item 5)
:10
:
:
:
Shared dispositive power
 
None
11
 
 
 
Aggregate amount beneficially owned by each reporting person
 
1,218,900     (Item 5)
12
 
 
 
Check box if the aggregate amount in row (11) excludes certain shares
(SEE INSTRUCTIONS)
13
 
 
 
Percent of class represented by amount in row (11)
 
1.93%
14
 
 
 
Type of reporting person (SEE INSTRUCTIONS)                                                                                                                              
    IA, CO
 
4

 
CUSIP No. 007800105
1
Names of reporting persons
I.R.S. identification nos. of above persons (entities only)
GGCP, Inc.                                                 I.D. No.  13-3056041
2
Check the appropriate box if a member of a group (SEE INSTRUCTIONS)  (a)
 
 
(b)
 
3
Sec use only
 
4
Source of funds (SEE INSTRUCTIONS)
  WC
 
5
Check box if disclosure of legal proceedings is required pursuant to items 2 (d) or 2 (e)
 
 
6
Citizenship or place of organization
Wyoming
 
Number Of
 
Shares
 
Beneficially
 
Owned
 
By Each
 
Reporting
 
Person
 
With
: 7
:
:
:
Sole voting power
 
14,000  (Item 5)
: 8
:
:
:
Shared voting power
 
None
: 9
:
:
:
Sole dispositive power
 
14,000  (Item 5)
:10
:
:
:
Shared dispositive power
 
None
11
 
 
 
Aggregate amount beneficially owned by each reporting person
 
14,000  (Item 5)
 
12
 
 
 
Check box if the aggregate amount in row (11) excludes certain shares
(SEE INSTRUCTIONS)  X
13
 
 
 
Percent of class represented by amount in row (11)
 
0.02%
14
 
 
 
Type of reporting person (SEE INSTRUCTIONS)
    HC, CO

5

CUSIP No. 007800105
1
Names of reporting persons
I.R.S. identification nos. of above persons (entities only)
GAMCO Investors, Inc.                                                                                  I.D. No.  13-4007862
2
Check the appropriate box if a member of a group (SEE INSTRUCTIONS)  (a)
 
 
(b)
 
3
Sec use only
 
4
Source of funds (SEE INSTRUCTIONS)
None
 
5
Check box if disclosure of legal proceedings is required pursuant to items 2 (d) or 2 (e)
 
 
6
Citizenship or place of organization
   Delaware
 
Number Of
 
Shares
 
Beneficially
 
Owned
 
By Each
 
Reporting
 
Person
 
With
: 7
:
:
:
Sole voting power
 
None  (Item 5)
: 8
:
:
:
Shared voting power
 
None
: 9
:
:
:
Sole dispositive power
 
None  (Item 5)
:10
:
:
:
Shared dispositive power
 
None
11
 
 
 
Aggregate amount beneficially owned by each reporting person
 
None  (Item 5)
 
12
 
 
 
Check box if the aggregate amount in row (11) excludes certain shares
(SEE INSTRUCTIONS)  X
13
 
 
 
Percent of class represented by amount in row (11)
 
0.00%
 
14
 
 
 
Type of reporting person (SEE INSTRUCTIONS)
    HC, CO

6

CUSIP No. 007800105
1
Names of reporting persons
I.R.S. identification nos. of above persons (entities only)
Mario J. Gabelli
2
Check the appropriate box if a member of a group (SEE INSTRUCTIONS)  (a)
 
 
(b)
 
3
Sec use only
 
4
Source of funds (SEE INSTRUCTIONS)
 None
 
5
Check box if disclosure of legal proceedings is required pursuant to items 2 (d) or 2 (e)
 
 
6
Citizenship or place of organization
   USA
 
Number Of
 
Shares
 
Beneficially
 
Owned
 
By Each
 
Reporting
 
Person
 
With
: 7
:
:
:
Sole voting power
 
None
: 8
:
:
:
Shared voting power
 
None
: 9
:
:
:
Sole dispositive power
 
None
:10
:
:
:
Shared dispositive power
 
None
11
 
 
 
Aggregate amount beneficially owned by each reporting person
 
None
 
12
 
 
 
Check box if the aggregate amount in row (11) excludes certain shares
(SEE INSTRUCTIONS)  X
13
 
 
 
Percent of class represented by amount in row (11)
 
0.00%
14
 
 
 
Type of reporting person (SEE INSTRUCTIONS)
    IN

7

Item 1.                                        Security and Issuer
This Amendment No. 51 to Schedule 13D on the Common Stock of Aerojet Rocketdyne Holdings, Inc. (previously filed under GenCorp Inc.) (the "Issuer") is being filed on behalf of the undersigned to amend the Schedule 13D, as amended (the "Schedule 13D") which was originally filed on November 30, 1988.  Unless otherwise indicated, all capitalized terms used herein but not defined herein shall have the same meanings as set forth in the Schedule 13D.

Item 2.                                        Identity and Background
Item 2 to Schedule 13D is amended, in pertinent part, as follows:
This statement is being filed by Mario J. Gabelli ("Mario Gabelli") and various entities which he
directly or indirectly controls or for which he acts as chief investment officer.  These entities engage in various aspects of the securities business, primarily as investment adviser to various institutional and individual clients, including registered investment companies and pension plans, and as general partner or the equivalent of various private investment partnerships or private funds.  Certain of these entities may also make investments for their own accounts.
The foregoing persons in the aggregate often own beneficially more than 5% of a class of equity securities of a particular issuer.  Although several of the foregoing persons are treated as institutional investors for purposes of reporting their beneficial ownership on the short-form Schedule 13G, the holdings of those who do not qualify as institutional investors may exceed the 1% threshold presented for filing on Schedule 13G or implementation of their investment philosophy may from time to time require action which could be viewed as not completely passive.  In order to avoid any question as to whether their beneficial ownership is being reported on the proper form and in order to provide greater investment flexibility and administrative uniformity, these persons have decided to file their beneficial ownership reports on the more detailed Schedule 13D form rather than on the short-form Schedule 13G and thereby to provide more expansive disclosure than may be necessary.
(a), (b) and (c) - This statement is being filed by one or more of the following persons: GGCP, Inc.  ("GGCP"), GGCP Holdings LLC ("GGCP Holdings"), GAMCO Investors, Inc. ("GBL"), Gabelli Funds, LLC ("Gabelli Funds"), GAMCO Asset Management Inc. ("GAMCO"), Teton Advisors, Inc. ("Teton Advisors"), Gabelli Securities, Inc. ("GSI"), G.research, LLC ("G.research"), MJG Associates, Inc. ("MJG Associates"), Gabelli Foundation, Inc. ("Foundation"), MJG-IV Limited Partnership ("MJG-IV"), and Mario Gabelli.  Those of the foregoing persons signing this Schedule 13D are hereinafter referred to as the "Reporting Persons".
GGCP makes investments for its own account and is the manager and a member of GGCP Holdings which is the controlling shareholder of GBL.  GBL, a public company listed on the New York Stock Exchange, is the parent company for a variety of companies engaged in the securities business, including those named below.
GAMCO, a wholly-owned subsidiary of GBL, is an investment adviser registered under the Investment Advisers Act of 1940, as amended ("Advisers Act").  GAMCO is an investment manager providing discretionary managed account services for employee benefit plans, private investors, endowments, foundations and others.
GSI, a majority-owned subsidiary of GBL, is an investment adviser registered under the Advisers Act and serves as a general partner or investment manager to limited partnerships and offshore investment companies and other accounts.  As a part of its business, GSI may purchase or sell securities for its own account.  GSI is a general partner or investment manager of a number of funds or partnerships, including Gabelli Associates Fund, L.P., Gabelli Associates Fund II, L.P., Gabelli Associates Limited, Gabelli Associates Limited II E, ALCE Partners, L.P., Gabelli Capital Structure Arbitrage Fund LP, Gabelli Capital Structure Arbitrage Fund Limited, Gabelli Intermediate Credit Fund L.P., Gabelli Japanese Value Partners L.P., GAMA Select Energy + L.P., GAMCO Medical Opportunities L.P., GAMCO Long/Short Equity Fund, L.P., Gabelli Multimedia Partners, L.P, Gabelli International Gold Fund Limited and Gabelli Green Long/Short Fund, L.P.
G.research, a wholly-owned subsidiary of GSI, is a broker-dealer registered under the Securities Exchange Act of 1934, as amended ("1934 Act"), which as a part of its business regularly purchases and sells securities for its own account.
Gabelli Funds, a wholly owned subsidiary of GBL, is a limited liability company. Gabelli Funds is an investment adviser registered under the Advisers Act which provides advisory services for The Gabelli Equity Trust Inc., The Gabelli Asset Fund, The GAMCO Growth Fund, The Gabelli Convertible and Income Securities Fund Inc., The Gabelli Value 25 Fund Inc., The Gabelli Small Cap Growth Fund, The Gabelli Equity Income Fund, The Gabelli ABC Fund, The GAMCO Global Telecommunications Fund, The Gabelli Gold Fund, Inc., The Gabelli Multimedia Trust Inc., The Gabelli Global Rising Income & Dividend Fund, The Gabelli Capital Asset Fund, The GAMCO International Growth Fund, Inc., The GAMCO Global Growth Fund, The Gabelli Utility Trust, The GAMCO Global Opportunity Fund, The Gabelli Utilities Fund, The Gabelli Dividend Growth Fund, The GAMCO Mathers Fund, The Gabelli Focus Five Fund, The Comstock Capital Value Fund, The Gabelli Dividend and Income Trust, The Gabelli Global Utility & Income Trust, The GAMCO Global Gold, Natural Resources, & Income Trust, The GAMCO Natural Resources Gold & Income Trust, The GDL Fund, Gabelli Enterprise Mergers & Acquisitions Fund, The Gabelli SRI Fund, Inc., The Gabelli Healthcare & Wellness Rx Trust, The Gabelli Global Small and Mid Cap Value Trust and Gabelli Value Plus+ Trust (collectively, the "Funds"), which are registered investment companies.  Gabelli Funds is also the investment adviser to The GAMCO International SICAV (sub-funds GAMCO Merger Arbitrage and GAMCO All Cap Value), a UCITS III vehicle.
Teton Advisors, an investment adviser registered under the Advisers Act, provides discretionary advisory services to The TETON Westwood Mighty Mitessm Fund, The TETON Westwood Income Fund, The TETON Westwood SmallCap Equity Fund, and The TETON Westwood Mid-Cap Equity Fund.
MJG Associates provides advisory services to private investment partnerships and offshore funds.  Mario Gabelli is the sole shareholder, director and employee of MJG Associates.   MJG Associates is the Investment Manager of Gabelli International Limited and Gabelli Fund, LDC.  Mario J. Gabelli is the general partner of Gabelli Performance Partnership, LP.
The Foundation is a private foundation.  Mario Gabelli is the Chairman, a Trustee and the Investment Manager of the Foundation. Elisa M. Wilson is the President of the Foundation.
Mario Gabelli is the controlling stockholder, Chief Executive Officer and a director of GGCP and Chairman and Chief Executive Officer of GBL.  Mario Gabelli is also a member of GGCP Holdings. Mario Gabelli is the controlling shareholder of Teton.
                             MJG-IV is a family partnership in which Mario Gabelli is the general partner.  Mario Gabelli has less than a 100% interest in MJG-IV.  MJG-IV makes investments for its own account.  Mario Gabelli disclaims ownership of the securities held by MJG-IV beyond his pecuniary interest.
The Reporting Persons do not admit that they constitute a group.
GAMCO and G.research are New York corporations and GBL, GSI, and Teton Advisors are Delaware corporations, each having its principal business office at One Corporate Center, Rye, New York 10580. GGCP is a Wyoming corporation having its principal business office at 140 Greenwich Avenue, Greenwich, CT 06830.   GGCP Holdings is a Delaware limited liability corporation having its principal business office at 140 Greenwich Avenue, Greenwich, CT 06830.  Gabelli Funds is a New York limited liability company having its principal business office at One Corporate Center, Rye, New York 10580.  MJG Associates is a Connecticut corporation having its principal business office at 140 Greenwich Avenue, Greenwich, CT 06830.  The Foundation is a Nevada corporation having its principal offices at 165 West Liberty Street, Reno, Nevada 89501.
For information required by instruction C to Schedule 13D with respect to the executive officers and directors of the foregoing entities and other related persons (collectively, "Covered Persons"), reference is made to Schedule I annexed hereto and incorporated herein by reference.
(d) – Not applicable.
(e) – Not applicable.
                          (f) – Reference is made to Schedule I hereto.

Item 5.                                        Interest In Securities Of The Issuer
Item 5 to Schedule 13D is amended, in pertinent part, as follows:
               (a) The aggregate number of Securities to which this Schedule 13D relates is 9,243,916 shares, representing 14.60% of the 63,316,612 shares outstanding. This latter number of shares is arrived at by adding the number of shares reported in the Issuer's most recently filed Form 10-Q for the quarterly period ended May 31, 2015 (63.0 million) to the number of shares which would be receivable by the Reporting Persons if they were to convert all of the Issuer's 4.0625% Convertible Subordinated Debentures held by them into the Common Stock of the Issuer (316,612 shares).  The Reporting Persons beneficially owned those Securities as follows:

 
 
Name
 
Shares of
    Common Stock
 
% of Class of
Common
Shares of Common Stock Converted
% of
Common Stock Converted
Gabelli Funds
 
2,591,095
4.11%
2,896,598
4.57%
GAMCO
5,103,309
8.10%
5,114,418
8.08%
 
Teton Advisors
 
1,218,900
 
1.93%
 
1,218,900
 
1.93%
 
GGCP
 
14,000
 
0.02%
 
14,000
 
0.02%

Mario Gabelli is deemed to have beneficial ownership of the Securities owned beneficially by each of the foregoing persons.  GSI is deemed to have beneficial ownership of the Securities beneficially owned by G.research.  GBL and GGCP are deemed to have beneficial ownership of the Securities owned beneficially by each of the foregoing persons other than Mario Gabelli and the Foundation.
(b) Each of the Reporting Persons and Covered Persons has the sole power to vote or direct the vote and sole power to dispose or to direct the disposition of the Securities reported for it, either for its own benefit or for the benefit of its investment clients or its partners, as the case may be, except that (i) GAMCO does not have the authority to vote 340,499 of the reported shares, (ii) Gabelli Funds has sole dispositive and voting power with respect to the shares of the Issuer held by the Funds so long as the aggregate voting interest of all joint filers does not exceed 25% of their total voting interest in the Issuer and, in that event, the Proxy Voting Committee of each Fund shall respectively vote that Fund's shares, (iii) at any time, the Proxy Voting Committee of each such Fund may take and exercise in its sole discretion the entire voting power with respect to the shares held by such fund under special  circumstances such as regulatory considerations, and (iv) the power of Mario Gabelli, GBL, and GGCP is indirect with respect to Securities beneficially owned directly by other Reporting Persons.
(c) Information with respect to all transactions in the Securities which were effected during the past sixty days or since the most recent filing on Schedule 13D, whichever is less, by each of the Reporting Persons and Covered Persons is set forth on Schedule II annexed hereto and incorporated herein by reference.
(e) Not applicable.

8

Signature
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
Dated:            August 6, 2015

GGCP, INC.
MARIO J. GABELLI

By:/s/ Douglas R. Jamieson                                                                                                  
     Douglas R. Jamieson
     Attorney-in-Fact



TETON ADVISORS, INC.


By:/s/ David Goldman                                                                                    
     David Goldman
     General Counsel – Teton Advisors, Inc.




GAMCO ASSET MANAGEMENT INC.
  GAMCO INVESTORS, INC.
GABELLI FUNDS, LLC


By:/s/ Douglas R. Jamieson                                                                                                  
     Douglas R. Jamieson
                    President & Chief Operating Officer – GAMCO Investors, Inc.
      President – GAMCO Asset Management Inc.
                                                                                                        President & Chief Operating Officer of the sole member of
Gabelli Funds, LLC


9

Schedule I
     Information with Respect to Executive
Officers and Directors of the Undersigned
Schedule I to Schedule 13D is amended, in pertinent part, as follows:

The following sets forth as to each of the executive officers and directors of the undersigned: his name; his business address; his present principal occupation or employment and the name, principal business and address of any corporation or other organization in which such employment is conducted.  Unless otherwise specified, the principal employer of each such individual is GAMCO Asset Management Inc., Gabelli Funds, LLC, Gabelli Securities, Inc., G.research, Inc., Teton Advisors, Inc., or GAMCO Investors, Inc., the business address of each of which is One Corporate Center, Rye, New York 10580, and each such individual identified below is a citizen of the United States.  To the knowledge of the undersigned, during the last five years, no such person has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors), and no such person was a party to a civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which he was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities law or finding any violation with respect to such laws except as reported in Item 2(d) and (e) of this Schedule 13D.















10





GAMCO Investors, Inc.
Directors:
 
 
               Edwin L. Artzt
 
 
 
 
Raymond C. Avansino
 
 
 
 
               Richard L. Bready
 
 
 
 
              Marc Gabelli
 
Former Chairman and Chief Executive Officer
Procter & Gamble Company
900 Adams Crossing
Cincinnati, OH 45202
 
Chairman & Chief Executive Officer
E.L. Wiegand Foundation
165 West Liberty Street
Reno, NV 89501
 
Former Chairman and Chief Executive Officer
Nortek, Inc.
50 Kennedy Plaza
Providence, RI 02903
 
Chairman of The LGL Group, Inc.
2525 Shader Road
Orlando, FL 32804
 
Mario J. Gabelli
 
 
 
               Elisa M. Wilson
Chief Executive Officer of GGCP, Inc., and Chairman & Chief Executive Officer of GAMCO Investors, Inc.; Director/Trustee of all registered investment companies advised by Gabelli Funds, LLC.
 
Director
c/o GAMCO Investors, Inc.
One Corporate Center
Rye, NY 10580
   
               Eugene R. McGrath
 
Former Chairman and Chief Executive Officer
Consolidated Edison, Inc.
4 Irving Place
New York, NY 10003
 
               Robert S. Prather
 
 
President & Chief Executive Officer
Heartland Media, LLC
1843 West Wesley Road
Atlanta, GA 30327
 
Officers:
 
Mario J. Gabelli
 
Chairman and Chief Executive Officer
 
Douglas R. Jamieson
 
Henry G. Van der Eb
 
Bruce N. Alpert
 
Agnes Mullady
 
Robert S. Zuccaro
 
Kevin Handwerker
 
President and Chief Operating Officer
 
Senior Vice President
 
Senior Vice President
 
Senior Vice President
 
Executive Vice President and Chief Financial Officer
 
Executive Vice President, General Counsel and Secretary
   
GAMCO Asset Management Inc.
Directors:
 
 
Douglas R. Jamieson
Regina M. Pitaro
William S. Selby
 
 
Officers:
 
 
Mario J. Gabelli
Chief Executive Officer and Chief Investment Officer – Value Portfolios
 
Douglas R. Jamieson
 
               Robert S. Zuccaro
 
               David Goldman
 
President, Chief Operating Officer and Managing Director
 
Chief Financial Officer
 
General Counsel, Secretary & Chief Compliance Officer
 
Gabelli Funds, LLC
Officers:
 
 
Mario J. Gabelli
 
Chief Investment Officer – Value Portfolios
Bruce N. Alpert
Executive Vice President and Chief Operating Officer
 
               Agnes Mullady
President and Chief Operating Officer – Open End Fund Division
 
               Robert S. Zuccaro
 
Chief Financial Officer
 
               David Goldman
 
General Counsel
   
Gabelli Securities, Inc.
 
Directors:
 
Robert W. Blake
President of W. R. Blake & Sons, Inc.
196-20 Northern Boulevard
Flushing, NY   11358
 
Douglas G. DeVivo
Co-Chairman of the Board and
DeVivo Asset Management Company LLC
P.O. Box 2048
Menlo Park, CA 94027
 
               Marc J. Gabelli
 
Co-Chairman of the Board
 Douglas R. Jamieson
 
President
 
               Daniel R. Lee
Chief Executive Officer
Full House Resorts, Inc.
4670 South Ford Apache Road, Suite 190
Las Vegas, NV 89147
               William C. Mattison, Jr.
 
               Salvatore F. Sodano
Vice Chairman

Officers:
 
Douglas R. Jamieson
 
Robert S. Zuccaro
 
Diane M. LaPointe
 
Kevin Handwerker
 
David M. Goldman
 
David Fitzgerald
See above
 
Chief Financial Officer
 
Controller
 
Secretary
 
General Counsel & Assistant Secretary
 
Chief Compliance Officer
 
G.research, Inc.
Directors:
 
               Daniel M. Miller
Chairman
 
              Cornelius V. McGinity
 
President
 
Officers:
 
Daniel M. Miller
See above
 
               Cornelius V. McGinity
 
See above
Bruce N. Alpert
 
               Diane M. LaPointe
 
               Douglas R. Jamieson
 
               David M. Goldman
 
               Josephine D. LaFauci
Vice President
 
Controller and Financial & Operations Principal
 
Secretary
 
Assistant Secretary
 
Chief Compliance Officer
 
Gabelli Foundation, Inc.
Officers:
 
                Mario J. Gabelli
Chairman, Trustee & Chief Investment Officer
 
                Elisa M. Wilson
 
                Marc J. Gabelli
 
                Matthew R. Gabelli
 
                Michael Gabelli
President
 
Trustee
 
Trustee
 
Trustee
 
MJG-IV Limited Partnership
Officers:
 
                 Mario J. Gabelli
General Partner




11





GGCP, Inc.
Directors:
 
               Mario J. Gabelli
 
Chief Executive Officer of GGCP, Inc., and Chairman & Chief Executive Officer of GAMCO Investors, Inc.; Director/Trustee of all registered investment companies advised by Gabelli Funds, LLC.
 
Marc J. Gabelli
 
Chairman of The LGL Group, Inc.
2525 Shader Road
Orlando, FL 32804
 
Matthew R. Gabelli
 
Vice President – Trading
G.research, Inc.
One Corporate Center
Rye,  NY 10580
 
              Michael Gabelli
 
 
President & COO
Gabelli & Partners, LLC
One Corporate Center
Rye, NY 10580
 
Charles C. Baum
 
 
 
Secretary & Treasurer
United Holdings Co., Inc.
2545 Wilkens Avenue
Baltimore, MD   21223
 
              Fredric V. Salerno
 
Chairman; Former Vice Chairman and Chief Financial Officer
Verizon Communications
 
   
Officers:
 
Mario J. Gabelli
Chief Executive Officer and Chief Investment Officer
              Marc J. Gabelli
President
               Silvio A. Berni
 
Vice President, Assistant Secretary and Controller
   
GGCP Holdings LLC
Members:
 
              GGCP, Inc.
 
              Mario J. Gabelli
 
 
 
Manager and Member
 
Member







12




 
Teton Advisors, Inc.
Directors:
 
Howard F. Ward
 
               Nicholas F. Galluccio
 
               Vincent J. Amabile
 
               John Tesoro
 
Chairman of the Board
 
Chief Executive Officer and President
 
 
Officers:
 
Howard F. Ward
 
               Nicholas F. Galluccio
 
               Robert S. Zuccaro
 
               David Goldman
 
               Tiffany Hayden
 
See above
 
See above
 
Chief Financial Officer
 
General Counsel
 
Secretary




 
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                                SCHEDULE II
                            INFORMATION WITH RESPECT TO
                 TRANSACTIONS EFFECTED DURING THE PAST SIXTY DAYS OR
                 SINCE THE MOST RECENT FILING ON SCHEDULE 13D (1)
                                   SHARES PURCHASED        AVERAGE
                        DATE            SOLD(-)             PRICE(2)

 COMMON STOCK-AEROJET ROCKETDYNE HOLDINGS, INC.

          GAMCO ASSET MANAGEMENT INC.
                       8/05/15            8,300-           22.9654
                       8/04/15              200-           23.2100
                       8/03/15            5,000-           23.2987
                       7/31/15           16,500-           23.2108
                       7/31/15              150            23.3000
                       7/30/15              700            22.6571
                       7/30/15            5,000-           22.8640
                       7/30/15            9,000-           22.8765
                       7/29/15           15,500-           23.2730
                       7/27/15            4,050-           23.0499
                       7/27/15              400            22.9916
                       7/23/15              500-           23.7258
                       7/21/15              125            23.8200
                       7/21/15              689-             *DO
                       7/21/15              250-             *DO
                       7/21/15            3,252-             *DO
                       7/21/15               63-             *DO
                       7/21/15              250-             *DO
                       7/21/15              251-             *DO
                       7/21/15              500-             *DO
                       7/17/15              300-           24.3000
                       7/16/15            1,200-           24.2100
                       7/16/15            1,000-           24.1209
                       7/15/15              900-           23.8558
                       7/15/15            4,100-           23.8432
                       7/14/15           10,000-           23.3145
                       7/14/15              300            23.3600
                       7/13/15           13,600-           22.5728
                       7/13/15              700-           22.5000
                       7/10/15            6,000-           21.1808
                       7/06/15            1,500-           20.8201
                       7/01/15           25,080-             *DO
                       7/01/15              656-             *DO
                       7/01/15              664-             *DO
                       6/30/15              300            20.7233
                       6/25/15            3,364-           21.1000
                       6/24/15              636-           21.1003
                       6/23/15            1,000-           21.3024
                       6/22/15            2,000-           21.3331
                       6/22/15            1,000-           21.3800
                       6/19/15              600            21.1400
                       6/16/15            4,500-             *DO
                       6/15/15              600            20.8499
                       6/11/15            6,000-           20.9589
                       6/09/15              600            20.1550
                       6/08/15              500            20.4600
          GABELLI FUNDS, LLC.
             GABELLI CONVERTIBLE AND INCOME SECURITIES FUND
                       7/20/15           44,437            24.2627
                       7/17/15           17,326-           24.2693
                       7/16/15           24,000-           24.2032
                       7/15/15           55,546            23.8028
             GABELLI ASSET FUND
                       7/15/15            3,000-           24.0507

CONVERTIBLE SUBORDINATED DEBENTURES -AEROJET ROCKETDYNE HOLDINGS, INC.
          GABELLI FUNDS, LLC.
             GABELLI CONVERTIBLE AND INCOME SECURITIES FUND
                       7/15/15              500-          264.4300
                       7/20/15              400-          269.5400


(1) UNLESS OTHERWISE INDICATED, ALL TRANSACTIONS WERE EFFECTED
    ON THE NYSE.

(2) PRICE EXCLUDES COMMISSION.

(*) RESULTS IN CHANGE OF DISPOSITIVE POWER AND BENEFICIAL OWNERSHIP.


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