Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
HIGHBRIDGE CAPITAL MANAGEMENT LLC
   2. Issuer Name and Ticker or Trading Symbol
CASTLE A M & CO [CTAM] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
40 WEST 57TH ST., 32ND FLOOR		 3. Date of Earliest Transaction (Month/Day/Year)
06/05/2018
(Street)

NEW YORK, NY 10019		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
5.0% / 7.0% Convertible Sr Secured PIK Toggle Notes due 2022 (1) 06/05/2018   P   $ 2,278,524     (2)   (2) Common Stock, par value $0.01 per share (3) 604,720 (3) $ 2,090,545.77 $ 53,991,006 (4) I See footnote (5)

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
HIGHBRIDGE CAPITAL MANAGEMENT LLC
40 WEST 57TH ST.
32ND FLOOR
NEW YORK, NY 10019		     X    
1992 MSF International Ltd.
C/O HEDGESERV (CAYMAN) LTD.
WILLOW HOUSE, CRICKET SQUARE 3RD FLOOR
GEORGE TOWN, GRAND CAYMAN, E9 00000		     X    

Signatures

 Highbridge Capital Management, LLC, By: /s/ John Oliva, its Managing Director   06/07/2018
**Signature of Reporting Person Date
 1992 MSF International Ltd., By: Highbridge Capital Management, LLC, its Trading Manager, By: /s/ John Oliva, its Managing Director   06/07/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The Convertible Notes are convertible into shares of Common Stock at an initial conversion rate of 0.2654 shares of Common Stock per $1.00 principal amount of Convertible Notes (subject to adjustment in certain circumstances in accordance with the terms of the Convertible Notes).
(2) The Issuer's 5.00% / 7.00% Convertible Senior Secured PIK Toggle Notes due 2022 (the "Convertible Notes") are convertible at the election of the holder at any time prior to the close of business on the trading day immediately preceding August 31, 2022, the maturity date of the Convertible Notes.
(3) Upon conversion of the Convertible Notes, the settlement of the conversion right may, at the option of the Issuer, be in the form of shares of Common Stock, cash or a combination of cash and shares of Common Stock.
(4) Includes $2,053,185 principal amount of Convertible Notes received as payment-in-kind interest.
(5) The securities reported herein are held by (i) 1992 MSF International Ltd., a Cayman Islands exempted company ("MSF International") and (ii) 1992 Tactical Credit Master Fund, L.P., a Cayman Islands exempted limited partnership ("1992 Tactical" and together with MSF International, the "Funds"). Highbridge Capital Management, LLC ("HCM") serves as the trading manager of the Funds. Each Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of such Reporting Person's pecuniary interest therein.

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