SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* Whitebox Multi-Strategy Partners LP (Last) (First) (Middle) ESTERA CORPORATE SERVICES (BVI) LTD. JAYLA PLACE, WICKHAMS CAY 1, BOX 3190 (Street) ROAD TOWN, TORTOLA D8 VG1110 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 03/27/2020	3. Issuer Name and Ticker or Trading Symbol A. M. Castle & Co. [ CTAM ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	10,613,180	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
3%/5% Convertible Sr. Secured PIK Toggle Notes due 2024(3)	(1)	(1)	Common Stock	30,987,909(2)	(2)	D

Explanation of Responses:

1. The Issuer's 3.00% / 5.00% Convertible Senior Secured PIK Toggle Notes due 2024 (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, 2024, the maturity date for the Convertible Notes.

2. The number of shares assumes that the Convertible Notes are converted at a rate of 2.1939631 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 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.

3. The Reporting Person does not acknowledge that the Convertible Notes are derivative securities for purposes of Section 16 of the Securities Exchange Act of 1934.

	Whitebox Multi-Strategy Partners, LP By: Whitebox General Partner LLC By: /s/ Daniel Altabef, Title: General Counsel-- Regulatory Affairs & Compliance	03/31/2020
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
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