Exhibit 99.1

A. M. CASTLE & CO. 3400 North Wolf Road
Franklin Park, Illinois 60131
(847) 455-7111
(847) 455-6930 (Fax)

For Further Information:

AT THE COMPANY	AT ASHTON PARTNERS
Larry A. Boik	Analyst Contacts:
Vice President-Finance & CFO	Katie Pyra
(847) 349-2576	(312) 553-6717
Email: lboik@amcastle.com	Email: kpyra@ashtonpartners.com
Traded: AMEX, CSE (CAS)
Member: S&P SmallCap 600 Index

FOR IMMEDIATE RELEASE
FRIDAY, MARCH 31, 2006

A. M. Castle & Co. Report Final Audited Year-End 2005 Results

FRANKLIN PARK, IL, MARCH 31^ST – A. M. Castle & Co. (AMEX: CAS), one of North America’s leading metals and plastics distributors, announced the final audited results for the year ended December 31, 2005. This release represents a change from the unaudited figures included in the Company’s March 13, 2006 release. The final results include a LIFO (last-in, first-out) inventory valuation adjustment, which resulted in a non-cash $4.0 million after-tax charge as compared to the previously announced results.

The impact of this adjustment reduces fourth quarter 2005 diluted earnings per share from $0.39 (as reported on March 13, 2006) to $0.18 as reported in the audited results. By comparison, earnings per share (diluted) for the fourth quarter of 2004 were $0.12. For the year 2005, diluted earnings per share were $2.11 as compared to $0.82 in the prior year.

“Final determination of our LIFO year-end adjustment is a complex process which can only be calculated at year-end after all final inventory levels by SKU are known and all final invoices for material purchases are in hand,” stated Larry A. Boik, Vice President and CFO. “The process takes on an added complexity during periods of frequent price changes as characterized in 2004 and 2005,” he continued. During 2004 the total increase in the LIFO reserve was $49.7 million as compared to $11.5 million during 2005, reflecting the continued escalation in material costs (albeit at a slower rate of change during 2005).

On an annual basis, the Company’s sales increased 26% to a level of $959 million during 2005. Net income applicable to shareholders increased 162% to a level of $37.9 million on a year-over-year basis. EBITDA increased 87% to a level of $84.8 million in 2005.

A. M. Castle & Co.
Add One

All figures for both the quarter and the year include the impact of the Company’s adoption of FAS 123R—“Accounting for Stock Based Compensation” as reported in the March 13, 2006 press release.

“Let us not lose sight of the fact that the fundamentals of the business at A. M. Castle remain very strong,” said Michael Goldberg, President and CEO. “Sales, gross material margins and net income are all very strong and we remain optimistic about the outlook for 2006,” he continued. The 10K will be filed today, March 31, 2006.

About A. M. Castle & Co.

Founded in 1890, A. M. Castle & Co. is a specialty metals and plastics distribution company serving the North American market, principally within the producer durable equipment sector. Its customer base includes many Fortune 500 companies as well as thousands of medium and smaller-sized firms spread across a wide spectrum of industries. Within its core metals business, it specializes in the distribution of carbon, alloy and stainless steels; nickel alloy; and aluminum. Through its subsidiary, Total Plastics, Inc., the Company also distributes a broad range of value-added industrial plastics. Together, Castle operates over 50 locations throughout North America. Its common stock is traded on the American and Chicago Stock Exchange under the ticker symbol “CAS”.

Safe Harbor Statement / Regulation G Disclosure

This release may contain forward-looking statements relating to future financial results. Actual results may differ materially as a result of factors over which the Company has no control. These risk factors and additional information are included in the Company’s reports on file with the Securities Exchange Commission.

     The financial statements included in this release contain a non-GAAP disclosure, EBITDA, which consists of income before provision for income taxes plus depreciation and amortization, debt extinguishment expense, and interest expense (including discount on accounts receivable sold), less interest income. EBITDA is presented as a supplemental disclosure because this measure is widely used by the investment community for evaluation purposes and provides the reader with additional information in analyzing the Company’s operating results. EBITDA should not be considered as an alternative to net income or any other item calculated in accordance with U.S. GAAP, or as an indicator of operating performance. Our definition of EBITDA used here may differ from that used by other companies. A reconciliation of EBITDA to net income is provided per U.S. Securities and Exchange Commission requirements.

A. M. Castle & Co.
Add Two

CONSOLIDATED STATEMENTS OF INCOME
(Dollars in thousands, except per share data)

	For the Three						For the
	Months Ended						Year Ended
	Dec 31,						Dec 31,
	2005 (1)			2004			2005 (1)			2004
Net sales	$	227,257		$	197,803		$	958,978		$	760,997
Cost of material sold		(164,480	)		(145,049	)		(677,186	)		(543,426	)
Gross material margin		62,777			52,754			281,792			217,571
Plant and delivery expense		(26,792	)		(24,561	)		(108,427	)		(95,229	)
Sales, general, and administrative expense		(23,340	)		(21,422	)		(92,848	)		(82,142	)
Depreciation and amortization expense		(2,588	)		(2,015	)		(9,340	)		(8,751	)
Total operating expense		(52,720	)		(47,998	)		(210,615	)		(186,122	)
Operating income		10,057			4,756			71,177			31,449
Interest expense, net		(1,473	)		(2,261	)		(7,348	)		(8,968	)
Discount on sale of accounts receivable		—			(285	)		(1,127	)		(969	)
Loss on extinguishment of debt		(4,904	)		—			(4,904	)		—
Income before income tax and equity in earnings of joint venture		3,680			2,210			57,798			21,512
Income taxes		(1,303	)		(2,084	)		(23,191	)		(11,294	)
Income before equity in earnings of joint ventures		2,377			126			34,607			10,218
Equity in earnings of joint venture		960			2,002			4,302			5,199
Net income		3,337			2,128			38,909			15,417
Preferred dividends		(241	)		(239	)		(961	)		(957	)
Net income applicable to common stock	$	3,096		$	1,889		$	37,948		$	14,460
Basic earnings per share	$	0.19		$	0.12		$	2.37		$	0.92
Diluted earnings per share	$	0.18		$	0.12		$	2.11		$	0.82
EBITDA *	$	13,605		$	8,773		$	84,819		$	45,399

* Earnings before interest, discount on sale of accounts receivable, taxes, depreciation and amortization, and debt extinguishment expense

Reconciliation of EBITDA to net income:

	For the Three				For the Twelve
	Months Ended				Months Ended
	Dec 31,				Dec 31,
	2005 (1)		2004		2005 (1)		2004
Net income	$	3,337	$	2,128	$	38,909	$	15,417
Depreciation and amortization		2,588		2,015		9,340		8,751
Interest, net		1,473		2,261		7,348		8,968
Discount on accounts receivable sold		—		285		1,127		969
Debt extinguishment		4,904		—		4,904		—
Provision from income taxes		1,303		2,084		23,191		11,294
EBITDA	$	13,605	$	8,773	$	84,819	$	45,399

⁽¹⁾ Revised

A. M. Castle & Co.
Add Three

CONSOLIDATED BALANCE SHEETS
(Dollars in thousands)

	As of
	Dec 31,			Dec 31,
	2005 (1)			2004
ASSETS
Current assets
Cash and cash equivalents	$	37,392		$	3,106
Accounts receivable, less allowances of $1,763 in 2005 and $1,760 in 2004		107,064			80,323
Inventories (principally on last-in, first-out basis) (latest cost higher by $104,036 in 2005 and $92,500 in 2004)		119,306			135,588
Other current assets		6,351			8,489
Total current assets		270,113			227,506
Investment in joint venture		10,850			8,463
Goodwill and intangible assets		32,222			32,201
Prepaid pension cost		41,946			42,262
Other assets		4,182			7,586
Property, plant and equipment, at cost
Land		4,772			4,771
Building		45,890			45,514
Machinery and equipment		127,048			124,641
		177,710			174,926
Less — accumulated depreciation		(113,288	)		(109,928	)
		64,422			64,998
Total assets	$	423,735		$	383,016
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities
Accounts payable	$	103,246		$	93,342
Accrued liabilities		21,535			19,591
Current and deferred income taxes		7,052			3,653
Current portion of long-term debt		6,233			11,607
Total current liabilities		138,066			128,193
Long-term debt, less current portion		73,827			89,771
Deferred income taxes		21,903			19,668
Deferred gain on sale-leaseback assets		5,967			6,465
Pension and postretirement benefit obligations		8,467			6,874
Minority interest		—			1,644
Commitments and contingencies
Stockholders’ equity
Preferred stock, no par value - 10,000,000 shares authorized; 12,000 shares issued and outstanding		11,239			11,239
Common stock, $0.01 par value — authorized 30,000,000 shares; issued and outstanding 16,605,714 in 2005 and 15,806,366 in 2004		166			159
Additional paid in capital		60,916			45,052
Retained earnings		110,530			72,582
Accumulated other comprehensive income		2,370			1,616
Other — deferred compensation		—			(2	)
Treasury stock, at cost - 546,065 shares at December 31, 2005 and 62,065 shares at December 31, 2004		(9,716	)		(245	)
Total stockholders’ equity		175,505			130,401
Total liabilities and stockholders’ equity	$	423,735		$	383,016

⁽¹⁾ Revised

A. M. Castle & Co.
Add Four

Revised Consolidated Statement of Income
(dollars in thousands, except earnings per share data)

	For the Three Months Ended Dec 31, 2005									For the Year Ended Dec 31, 2005
	Per									Per
	3/13/2006									3/13/2006
	Earnings			LIFO			As			Earnings			LIFO			As
	Release			Adjustment			Revised			Release			Adjustment			Revised
Net sales	$	227,257		$	—		$	227,257		$	958,978		$	—		$	958,978
Cost of material sold		(157,968	)		(6,512	)		(164,480	)		(670,674	)		(6,512	)		(677,186	)
Gross material margin		69,289			(6,512	)		62,777			288,304			(6,512	)		281,792
Operating income		16,569			(6,512	)		10,057			77,689			(6,512	)		71,177
Income before income taxes and equity earnings of joint venture		10,192			(6,512	)		3,680			64,310			(6,512	)		57,798
Income tax expense		(3,857	)		2,554			(1,303	)		(25,745	)		2,554			(23,191	)
Equity in earnings of joint venture		960			—			960			4,302			—			4,302
Net Income	$	7,295		$	(3,958	)	$	3,337		$	42,867		$	(3,958	)	$	38,909
Net income applicable to common stock	$	7,054		$	(3,958	)	$	3,096		$	41,906		$	(3,958	)	$	37,948
Basic earnings per share	$	0.43		$	(0.24	)	$	0.19		$	2.61		$	(0.24	)	$	2.37
Diluted earnings per share	$	0.39		$	(0.22	)	$	0.18		$	2.33		$	(0.22	)	$	2.11
EBITDA	$	20,117		$	(6,512	)	$	13,605		$	91,331		$	(6,512	)	$	84,819

Revised Consolidated Balance Sheet
(dollars in thousands)

	For the Year Ended Dec 31, 2005
	Per
	3/13/2006
	Earnings		LIFO			As
	Release		Adjustment			Revised
ASSETS
Cash and cash equivalents	$	37,392	$	—		$	37,392
Accounts receivable, net		107,064		—			107,064
Inventories (principally on last-in, first-out)		125,818		(6,512	)		119,306
Other current assets		6,351		—			6,351
Total current assets		276,625		(6,512	)		270,113
Total assets	$	430,247	$	(6,512	)	$	423,735
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts Payable and accrued liabilities	$	130,074	$	(5,293	)	$	124,781
Current and deferred income taxes		9,606		(2,554	)		7,052
Current portion of long-term debt		6,233		—			6,233
Total current liabilities		145,913		(7,847	)		138,066
Long-term debt, less current portion		73,827		—			73,827
Deferred income taxes		21,903		—			21,903
Other long-term liabilities		9,141		5,293			14,434
Stockholders’ equity		179,463		(3,958	)		175,505
Total liabilities and stockholders’ equity	$	430,247	$	(6,512	)	$	423,735