Exhibit 99.1

HCC INSURANCE HOLDINGS REPORTS

RECORD NET EARNINGS

FOR THE FIRST QUARTER OF 2013

Highlights:

·Net earnings of $105.9 million, or $1.05 per diluted share

·GAAP combined ratio of 83.8%

·Net written premium increased 4% to $579.2 million

·Annualized return on equity of 11.9%

·Annualized operating return on equity(a) of 11.4%

HOUSTON (April 30, 2013) . . .

HCC Insurance Holdings, Inc. (NYSE: HCC) today released results for its first quarter ended March 31, 2013.

Net earnings were $105.9 million, or $1.05 per diluted share, for the first quarter of 2013, compared to $82.6 million, or $0.79 per diluted share, for the first quarter of 2012.

The Company’s combined ratio was 83.8% for the first quarter of 2013, compared to 85.5% for the first quarter of 2012.  HCC’s paid loss ratio was 53.4% for the first quarter of 2013, compared to 63.0% for the same quarter of 2012.  The 2012 paid loss ratio included 5.1 percentage points related to a commutation in Exited Lines.  HCC had no loss development in either the first quarter of 2013 or 2012.  The 2013 results included accident year pretax net catastrophe losses of $5.2 million, which reduced net earnings by $0.03 per share.  The 2012 results included accident year pretax net catastrophe losses of $7.6 million, which reduced net earnings by $0.05 per share.

“Building on momentum from our record performance for full-year 2012, HCC began 2013 with its best-ever first quarter earnings.  We produced a combined ratio of 83.8% and an operating return on equity well in excess of our stated goal.  We believe HCC will continue to benefit from price improvements currently being experienced throughout many of our businesses,” HCC Chief Executive Officer Christopher J.B. Williams said.

Book value per share increased 1.7% and 10.7% for the first quarter of 2013 and the last twelve months, respectively, to $35.68 at March 31, 2013.  The Company purchased 0.7 million shares of its common stock during the first quarter of 2013 for $28.8 million at an average cost of $39.18 per share.

Gross written premium increased 5% to $720.2 million for the first quarter of 2013, compared to $682.7 million for the same quarter of 2012.  Net written premium increased 4% to $579.2 million for the first quarter of 2013, versus $558.4 million for the same quarter of 2012.  Net earned premium increased 3% to $561.2 million for the first quarter of 2013, compared to $547.1 million for the same quarter of 2012.

Investment income was $55.8 million for the first quarter of 2013, compared to $57.0 million for the same quarter of 2012.  As of March 31, 2013, HCC’s fixed maturity securities portfolio had an average rating of AA, with a duration of 4.9 years and an average long-term tax equivalent yield of 4.6%.

HCC generated operating cash flow of $69.2 million in the first quarter of 2013, compared to $125.2 million in the same quarter of 2012.  Operating cash flow is cash flow from operating activities excluding surety collateral outflows of $67.1 million and $22.7 million in the first quarter of 2013 and 2012, respectively, as well as a payment of $27.5 million in 2012 to commute a large contract in Exited Lines.  The Company’s liquidity position remains strong with $343.1 million of cash and short-term investments and $270.6 million of available capacity under its $600.0 million revolving loan facility at March 31, 2013.

As of March 31, 2013, total assets were $10.2 billion, shareholders’ equity was $3.6 billion and the Company’s debt to total capital ratio was 14.7%.

For further information about HCC’s 2013 first quarter results, see the supplemental financial schedules that are accessible on HCC’s website at http://www.hcc.com, as well as directly in the Investor Relations section of HCC’s website at http://ir.hcc.com.

(Note: If clicking on the above links does not open in a new web page, please cut and paste the above URLs into your browser’s address bar.)

HCC will hold an open conference call beginning at 8:00 a.m. Central Daylight Time on Wednesday, May 1.  To participate, the number for domestic calls is (800) 374-0290 and the number for international calls is (706) 634-0161.  There will also be a live webcast available on a listen-only basis that can be accessed through the HCC website at http://www.hcc.com.  The webcast replay will be archived in the Investor Relations section of the HCC website through Friday, August 2, 2013.

Headquartered in Houston, Texas, HCC Insurance Holdings, Inc. is a leading specialty insurer with offices in the United States, the United Kingdom, Spain and Ireland.  HCC’s major domestic and international insurance companies have financial strength ratings of “AA (Very Strong)” from Standard & Poor’s Corporation, “A+ (Superior)” from A.M. Best Company, Inc., “AA (Very Strong)” from Fitch Ratings, and “A1 (Good Security)” from Moody’s Investors Service, Inc.

For more information about HCC, please visit http://www.hcc.com.

2

a)Non-GAAP Financial Measure

Annualized operating return on equity is a non-GAAP financial measure under Regulation G and is calculated as net earnings excluding after-tax net realized investment gain/loss, other-than-temporary impairment credit losses, and foreign currency benefit/expense (collectively, operating earnings) divided by average shareholders’ equity excluding accumulated other comprehensive income.  To annualize a quarterly rate, the result is multiplied by four.  See the supplemental financial schedules for a reconciliation of this non-GAAP financial measure to corresponding GAAP amounts.  Management believes annualized operating return on equity is a useful measure for understanding the Company’s profitability relative to shareholders’ equity before consideration of investment-related gains/losses and foreign currency benefit/expense, both of which management excludes when evaluating operating results internally.

Contact:	Doug Busker, Director of Investor Relations
	HCC Insurance Holdings, Inc.
	Telephone: (713) 996-1192

Forward-looking statements contained in this press release are made under “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995 and involve a number of risks and uncertainties.  The types of risks and uncertainties which may affect the Company are set forth in its periodic reports filed with the Securities and Exchange Commission.

*     *     *     *     *

3

HCC Insurance Holdings, Inc. and Subsidiaries

Financial Highlights

(Unaudited, in thousands except per share data)

	Three months ended
	March 31,
	2013			2012
Gross written premium	$	720,205		$	682,689
Net written premium	579,184			558,404
Net earned premium	561,186			547,141
Net investment income	55,765			57,010
Total revenue	634,366			609,523
Net earnings	105,850			82,584
Operating earnings*	93,139			84,270
Earnings per share (diluted)	$	1.05		$	0.79
Weighted-average shares outstanding (millions)	99.3			102.2
Net loss ratio	59.3		%	60.1		%
Combined ratio	83.8		%	85.5		%
Paid loss ratio	53.4		%	63.0		%

	March 31,			December 31,
	2013			2012
Total investments	$	6,806,052		$	6,950,398
Total assets	10,198,216			10,267,807
Shareholders’ equity	3,585,249			3,542,612
Debt to total capital ratio	14.7		%	14.2		%
Book value per share	$	35.68		$	35.10

*Non-GAAP financial measure under Regulation G.  See calculation on S - 9.  Management believes operating earnings is a useful measure for understanding the Company’s profitability before consideration of investment-related gains/losses and foreign currency benefit/expense, both of which management excludes when evaluating operating results internally.

S-1

HCC Insurance Holdings, Inc. and Subsidiaries

Consolidated Balance Sheets

(Unaudited, in thousands)

	March 31,			December 31,
	2013			2012
ASSETS
Investments:
Fixed maturity securities — available for sale, at fair value	$	6,185,456		$	6,281,781
Equity securities — available for sale, at fair value	350,352			284,639
Short-term investments	267,434			363,053
Other investments	2,810			20,925
Total investments	6,806,052			6,950,398
Cash	75,677			71,390
Restricted cash and securities	101,572			101,480
Premium, claims and other receivables	577,946			549,725
Reinsurance recoverables	1,066,351			1,071,222
Ceded unearned premium	257,359			256,988
Ceded life and annuity benefits	58,227			58,641
Deferred policy acquisition costs	192,199			191,960
Goodwill	885,994			885,860
Other assets	176,839			130,143
Total assets	$	10,198,216		$	10,267,807
LIABILITIES
Loss and loss adjustment expense payable	$	3,774,162		$	3,767,850
Life and annuity policy benefits	58,227			58,641
Reinsurance, premium and claims payable	321,394			294,621
Unearned premium	1,085,833			1,069,956
Deferred ceding commissions	72,992			74,609
Notes payable	618,982			583,944
Accounts payable and accrued liabilities	681,377			875,574
Total liabilities	6,612,967			6,725,195
SHAREHOLDERS’ EQUITY
Common stock	125,394			125,114
Additional paid-in capital	1,061,272			1,052,253
Retained earnings	2,845,444			2,756,166
Accumulated other comprehensive income	268,100			295,271
Treasury stock	(714,961		)	(686,192		)
Total shareholders’ equity	3,585,249			3,542,612
Total liabilities and shareholders’ equity	$	10,198,216		$	10,267,807

S-2

HCC Insurance Holdings, Inc. and Subsidiaries

Consolidated Statements of Earnings

(Unaudited, in thousands except per share data)

	Three months ended
	March 31,
	2013		2012
REVENUE
Net earned premium	$	561,186	$	547,141
Net investment income	55,765		57,010
Other operating income	8,845		5,201
Net realized investment gain	8,570		171
Total revenue	634,366		609,523
EXPENSE
Loss and loss adjustment expense, net	332,697		328,928
Policy acquisition costs, net	66,949		69,444
Other operating expense	76,853		87,282
Interest expense	6,471		6,909
Total expense	482,970		492,563
Earnings before income tax expense	151,396		116,960
Income tax expense	45,546		34,376
Net earnings	$	105,850	$	82,584
Basic earnings per share data:
Net earnings per share	$	1.05	$	0.80
Weighted-average shares outstanding (millions)	99.1		102.0
Diluted earnings per share data:
Net earnings per share	$	1.05	$	0.79
Weighted-average shares outstanding (millions)	99.3		102.2
Cash dividends declared, per share	$	0.165	$	0.155

S-3

HCC Insurance Holdings, Inc. and Subsidiaries

Gross Written Premium

(Unaudited, in thousands)

	Three months ended March 31,
	2013		2012		Change
U.S. Property & Casualty
Aviation	$	36,998	$	37,090	—	%
E&O	15,074		16,891		(11	)
Public Risk	21,441		19,784		8
Other	101,624		79,382		28
	175,137		153,147		14
Professional Liability
U.S. D&O	75,239		74,996		—
International D&O	28,780		26,249		10
	104,019		101,245		3
Accident & Health
Medical Stop-loss	202,808		193,233		5
Other	12,753		12,094		5
	215,561		205,327		5
U.S. Surety & Credit
Surety	37,696		39,926		(6	)
Credit	14,553		14,567		—
	52,249		54,493		(4	)
International
Energy	26,545		20,595		29
Property Treaty	72,345		69,338		4
Liability	18,133		19,260		(6	)
Surety & Credit	21,166		20,958		1
Other	29,618		27,525		8
	167,807		157,676		6
Exited Lines	5,432		10,801		(50	)
Totals	$	720,205	$	682,689	5	%

S-4

HCC Insurance Holdings, Inc. and Subsidiaries

Net Written Premium

(Unaudited, in thousands)

	Three months ended March 31,
	2013		2012		Change
U.S. Property & Casualty
Aviation	$	28,614	$	27,507	4	%
E&O	12,538		16,505		(24	)
Public Risk	15,771		15,594		1
Other	46,959		32,722		44
	103,882		92,328		13
Professional Liability
U.S. D&O	51,699		55,705		(7	)
International D&O	15,927		15,208		5
	67,626		70,913		(5	)
Accident & Health
Medical Stop-loss	202,594		193,087		5
Other	12,674		12,011		6
	215,268		205,098		5
U.S. Surety & Credit
Surety	33,690		36,134		(7	)
Credit	11,814		8,570		38
	45,504		44,704		2
International
Energy	14,669		12,824		14
Property Treaty	66,167		62,302		6
Liability	16,570		17,892		(7	)
Surety & Credit	18,649		19,027		(2	)
Other	25,417		22,525		13
	141,472		134,570		5
Exited Lines	5,432		10,791		(50	)
Totals	$	579,184	$	558,404	4	%

S-5

HCC Insurance Holdings, Inc. and Subsidiaries

Net Earned Premium

(Unaudited, in thousands)

	Three months ended March 31,
	2013		2012		Change
U.S. Property & Casualty
Aviation	$	27,857	$	28,823	(3	)%
E&O	13,198		16,377		(19	)
Public Risk	16,360		15,218		8
Other	36,116		28,600		26
	93,531		89,018		5
Professional Liability
U.S. D&O	76,705		86,254		(11	)
International D&O	16,074		15,184		6
	92,779		101,438		(9	)
Accident & Health
Medical Stop-loss	202,594		193,087		5
Other	14,531		13,794		5
	217,125		206,881		5
U.S. Surety & Credit
Surety	35,607		39,920		(11	)
Credit	11,570		7,809		48
	47,177		47,729		(1	)
International
Energy	21,039		15,094		39
Property Treaty	28,755		22,089		30
Liability	17,175		19,482		(12	)
Surety & Credit	18,213		17,761		3
Other	19,960		16,858		18
	105,142		91,284		15
Exited Lines	5,432		10,791		(50	)
Totals	$	561,186	$	547,141	3	%

S-6

HCC Insurance Holdings, Inc. and Subsidiaries

Net Investment Income and Unrealized Gain

(Unaudited, in thousands)

	Three months ended
	March 31,
	2013			2012
Sources of net investment income:
Fixed maturity securities
Taxable	$	25,960		$	31,115
Exempt from U.S. income taxes	27,889			26,612
Total fixed maturity securities	53,849			57,727
Equity securities	3,580			—
Short-term investments	12			62
Other	(47		)	467
Total investment income	57,394			58,256
Investment expense	(1,629		)	(1,246		)
Net investment income	$	55,765		$	57,010
Unrealized gain on available for sale securities:
Increase (decrease) in unrealized gain for period, before tax	$	(38,965	)	$	21,469
Unrealized gain at:
March 31, 2013	$	397,730
December 31, 2012	$	436,695

S-7

HCC Insurance Holdings, Inc. and Subsidiaries

Net Loss Ratios

(Unaudited, in thousands)

	Three months ended				Three months ended
	March 31, 2013				March 31, 2012
	Net earned		Loss		Net earned		Loss
	premium		ratio		premium		ratio
U.S. Property & Casualty
Aviation	$	27,857	61.7	%	$	28,823	46.9	%
E&O	13,198		60.2		16,377		61.0
Public Risk	16,360		78.2		15,218		93.0
Other	36,116		39.4		28,600		40.5
	93,531		55.8		89,018		55.3
Professional Liability
U.S. D&O	76,705		62.8		86,254		71.0
International D&O	16,074		51.2		15,184		51.9
	92,779		60.8		101,438		68.2
Accident & Health
Medical Stop-loss	202,594		75.2		193,087		75.3
Other	14,531		56.3		13,794		51.8
	217,125		73.9		206,881		73.7
U.S. Surety & Credit
Surety	35,607		25.0		39,920		24.8
Credit	11,570		37.4		7,809		14.6
	47,177		28.0		47,729		23.1
International
Energy	21,039		45.3		15,094		37.1
Property Treaty	28,755		24.3		22,089		12.8
Liability	17,175		49.9		19,482		51.2
Surety & Credit	18,213		63.5		17,761		67.9
Other	19,960		46.4		16,858		43.3
	105,142		43.7		91,284		41.4
Exited Lines	5,432		84.6		10,791		85.2
Totals	$	561,186	59.3	%	$	547,141	60.1	%

S-8

HCC Insurance Holdings, Inc. and Subsidiaries

Reconciliation of Non-GAAP Financial Measures to GAAP

(Unaudited, in thousands)

	Three months ended
	March 31,
	2013			2012
Numerator:
GAAP net earnings	$	105,850		$	82,584
Exclude:
Net realized investment gain*	5,571			111
Foreign currency benefit (expense)*	7,140			(1,797		)
Total items excluded from operating earnings	12,711			(1,686		)
Operating earnings	$	93,139		$	84,270
Denominator:
GAAP equity - beginning of period	$	3,542,612		$	3,273,982
Exclude - Accumulated other comprehensive income	295,271			227,659
Beginning equity, as adjusted	$	3,247,341		$	3,046,323
GAAP equity - end of period	$	3,585,249		$	3,293,957
Exclude - Accumulated other comprehensive income	268,100			244,295
Ending equity, as adjusted	$	3,317,149		$	3,049,662
Average equity, as adjusted	$	3,282,245		$	3,047,993
Annualized operating return on equity	11.4		%	11.1		%

* Net of tax, calculated using 35% statutory tax rate.

S-9