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 *
WHITEBOX ADVISORS 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)
3033 EXCELSIOR BOULEVARD, SUITE 300
3. Date of Earliest Transaction (Month/Day/Year)
06/05/2018
(Street)

MINNEAPOLIS, MN 55416
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
5.00% / 7.00% Convertible Senior Secured Notes due 2022 (1) (2) 06/05/2018   (2) P   $ 2,278,225     (3)   (3) Common Stock 604,640 (2) $ 2,090,271 $ 50,217,681 (4) I See Footnotes (5) (6)

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
WHITEBOX ADVISORS LLC
3033 EXCELSIOR BOULEVARD, SUITE 300
MINNEAPOLIS, MN 55416
    X    
WHITEBOX GENERAL PARTNER LLC
3033 EXCELSIOR BOULEVARD, SUITE 300
MINNEAPOLIS, MN 55416
    X    

Signatures

 Whitebox Advisors LLC, By: /s/ Elissa Weddle, Chief Legal Officer   06/07/2018
**Signature of Reporting Person Date

 Whitebox General Partner LLC, By: /s/ Elissa Weddle, Chief Legal Officer   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 Reporting Persons do not acknowledge that the Issuer's 5.00% / 7.00% Convertible Senior Secured PIK Toggle Notes due 2022 (the "Convertible Notes") are derivative securities for purposes of Section 16 of the Exchange Act, as amended (the "Exchange Act").
(2) The number of shares assumes that the Convertible Notes are converted at a rate of 0.2654 shares of common stock, par value $0.01 per share ("Common Stock") per $1.00 principal amount of Convertible Notes. However, upon conversion of the Convertible Notes, the settlement of the conversion right may, at the option of the A.M. Castle & Co. (the "Issuer"), be in the form of shares of Common Stock, cash or a combination of cash and shares of Common Stock in amounts determined in accordance with the indenture for the Convertible Notes and therefore there can be no certainty that the Convertible Notes could be converted into the number of shares provided in column 3. The Reporting Persons disclaim beneficial ownership of any shares of Common Stock that they might receive upon conversion of the Convertible Notes.
(3) 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 for the Convertible Notes.
(4) In addition to the $2,278,225 principal amount of Convertible Notes transacted in this Form 4, this total number of Convertible Notes accounts for (i) $6 subtracted from the original principal amount of Convertible Notes due to rounding corrections and (ii) $1,903,362 principal amount of Convertible Notes received as part of payments-in-kind from the Issuer under the terms of the Indenture dated August 31, 2017, between the Issuer, certain of its subsidiaries and Wilmington Savings Fund Society, FSB, as Trustee and Collateral Agent (see Exhibit 10.2 to the Issuer's Form 8-K filed with the SEC on September 6, 2017).
(5) These securities are directly owned by Pandora Select Partners, L.P., Whitebox Asymmetric Partners, L.P., Whitebox Credit Partners, L.P., Whitebox GT Fund, LP, Whitebox Institutional Partners, L.P., Whitebox Multi-Strategy Partners, L.P. and Whitebox Term Credit Fund I, L.P. (together, the "Private Funds") and may be deemed to be beneficially owned by (a) Whitebox Advisors LLC by virtue of its role as the investment manager of the Private Funds and (b) Whitebox General Partner LLC by virtue of its role as the general partner of the Private Funds.
(6) The Reporting Persons disclaim beneficial ownership of the reported securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Exchange Act, or for any other purpose.

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