Exhibit 99.1

FOR FURTHER INFORMATION:

AT FIRST MERCURY FINANCIAL CORPORATION:
Edward A. LaFramboise
Vice President — Finance
(248) 213-0406
elaframboise@firstmercury.com

FOR IMMEDIATE RELEASE
MONDAY, MAY 3, 2010

FIRST MERCURY FINANCIAL CORPORATION ANNOUNCES
FIRST QUARTER 2010 FINANCIAL RESULTS

SOUTHFIELD, MI — May 3, 2010 — First Mercury Financial Corporation (NYSE: FMR) (“First Mercury” or the “Company”) today announced results for the first quarter ended March 31, 2010.

Highlights for the first quarter 2010 include:

• Gross written premium growth of 7.5 percent

• Commission and fee income growth of 13.2 percent

• Net investment income growth of 34.7 percent

• Net income of $5.2 million, or $0.30 per diluted share

• Operating net income of $6.1 million, or $0.35 per diluted share

• Special dividend of $2.00 per share and fourth consecutive quarterly dividend of $0.025 per share

“We returned over $35 million to our shareholders through a special dividend and completed our restructuring initiatives during the quarter,” said Richard H. Smith, Chairman, President and Chief Executive Officer. “With these actions behind us, we believe we have adequate capital to support our growth strategy and have strengthened our position in the marketplace for an eventual turn in the property and casualty market cycle,” Smith concluded.

Written and Earned Premium

For the three months ended March 31, 2010, gross written premiums were $83.7 million, a 7.5 percent increase from the gross written premiums during the same period in 2009. There were $3.3 million of gross written premiums from assumed retroactive reinsurance transactions consummated during the three months ended March 31, 2010, which is included in “Other” in the gross written premiums exhibit in the Summary Financial Data table.

-MORE-

First Mercury Financial Corporation
Add 1

Net earned premiums during the three months ended March 31, 2010 were $51.7 million, a 1.8 percent decrease from the same period of 2009. There were $3.3 million of net earned premiums from assumed retroactive reinsurance transactions consummated during the three months ended March 31, 2010.

Commissions and Fees

Commissions and fees during the three months ended March 31, 2010 were $7.8 million, a 13.2 percent increase from the same period of 2009. The increase for the three months ended March 31, 2010 compared to the same period of 2009 is primarily due to an increase in commissions and fees related to our insurance services business for the three months ended March 31, 2010.

Investments

The Company recorded $5.8 million of pretax net unrealized gains on its available for sale investment portfolio during the three months ended March 31, 2010. The investment portfolio’s taxable equivalent total return was 2.4 percent for the three months ended March 31, 2010.

Losses and Loss Adjustment Expenses

During the three months ended March 31, 2010, there was no development of prior years’ loss and loss adjustment expense reserves. For the three months ended March 31, 2009, there was $0.8 million of favorable development of prior years’ loss and loss adjustment expense reserves.

Capital Management

On August 20, 2009, the Company’s Board of Directors approved a new Share Repurchase Program to repurchase up to 1,000,000 shares of outstanding common stock through August 20, 2010. As of March 31, 2010, the Company has not repurchased any shares under the new authorization. The Company paid a cash dividend of $2.025 per share on March 31, 2010. This represents the Company’s one-time, special cash dividend of $2.00 per share and the Company’s fourth consecutive quarterly dividend of $0.025 per share.

On April 30, 2010, the Company amended its existing credit agreement with its lender since the payment of the aforementioned special dividend would have resulted in a violation of a covenant in the credit agreement. The amendment extended the maturity date of the credit agreement from September 30, 2011 to September 30, 2013 and revised certain restrictive covenants.

Other

The Company recorded a pretax restructuring charge during the first quarter of 2010 of $5.0 million, or 9.7 percentage points of the expense ratio. The Company anticipates realizing pretax annual savings of approximately $4.5 million as a result of these actions.

-MORE-

First Mercury Financial Corporation
Add 2

Conference Call Details

The Company will host a conference call on May 4, 2010 at 11:00 a.m. Eastern Time to discuss first quarter results. The call can be accessed live by dialing 877-407-0789 or by visiting the Company’s website at www.firstmercury.com.

Investors may access a replay by dialing 877-660-6853, entering account #3055 and conference code 349664, which will be available through May 11, 2010. The webcast replay will also be archived in the “Investor Relations” section of the Company’s website.

About First Mercury Financial Corporation

First Mercury Financial Corporation provides insurance products and services primarily to the specialty commercial insurance markets, focusing on niche and underserved segments where we believe that we have underwriting expertise and other competitive advantages. During the Company’s 36 years of underwriting risks, First Mercury has developed the underwriting expertise and cost-efficient infrastructure which has enabled us to effectively underwrite such risks. Our risk-taking subsidiaries offer insurance products through our distribution subsidiaries: CoverX^®, FM Emerald and AMC, which are recognized brands among insurance producers.

Non-GAAP Financial Measures

Operating net income and operating net income per share are non-GAAP financial measures, and management believes that investors’ understanding of core operating performance is enhanced by First Mercury’s disclosure of these financial measures. Operating net income consists of net income adjusted to exclude the impact of net realized gains (losses) on investments, other-than-temporary impairment losses on investments, the change in fair value of derivative instruments, restructuring charges, and taxes related to these adjustments. Definitions of these items may not be comparable to the definitions used by other companies. Net income and net income per share are the GAAP financial measures that are most directly comparable to operating net income and operating net income per share.

-MORE-

First Mercury Financial Corporation
Add 3

Safe Harbor Statement

This release contains forward-looking statements that relate to future periods and includes statements regarding our anticipated performance. Generally, the words “anticipates,” “believes,” “expects,” “intends,” “estimates,” “projects,” “plans” and similar expressions identify forward-looking statements. These forward-looking statements involve known and unknown risks, uncertainties and other important factors that could cause our actual results, performance or achievements or industry results to differ materially from any future results, performance or achievements expressed or implied by these forward-looking statements. These risks, uncertainties and other important factors include, among others: recent and future events and circumstances impacting financial, stock, and capital markets, and the responses to such events by governments and the financial communities; the impact of catastrophic events and the occurrence of significant severe weather conditions on our operating results; our ability to maintain or the lowering or loss of one of our financial or claims-paying ratings; our actual incurred losses exceeding our loss and loss adjustment expense reserves; the failure of reinsurers to meet their obligations; our estimates for accrued profit sharing commissions are based on loss ratio performance and could be reduced if the underlying loss ratios deteriorate; our inability to obtain reinsurance coverage at reasonable prices; the failure of any loss limitations or exclusions or changes in claims or coverage; our lack of long-term operating history in certain specialty classes of insurance; our ability to acquire and retain additional underwriting expertise and capacity; the concentration of our insurance business in relatively few specialty classes; the increasingly competitive property and casualty marketplace; fluctuations and uncertainty within the excess and surplus lines insurance industry; the extensive regulations to which our business is subject and our failure to comply with these regulations; our ability to maintain our risk-based capital at levels required by regulatory authorities; our inability to realize our investment objectives; an economic downturn or other economic conditions adversely affecting our financial position; and the risks identified in our filings with the Securities and Exchange Commission, including our Annual Report on Form 10-K. Given these uncertainties, you are cautioned not to place undue reliance on these forward-looking statements. We assume no obligation to update or revise them or provide reasons why actual results may differ.

The Company uses the Investor Relations page of its website at www.firstmercury.com to make
information available to its investors and the public.

Financial Tables Follow...

-MORE-

First Mercury Financial Corporation
Add 4

First Mercury Financial Corporation
Condensed Consolidated Statements of Income
(Unaudited)

	Three Months Ended
	March 31,						%
	2010			2009			Change
	(Dollars in thousands, except share and per share data)
Operating Revenue
Net earned premiums	$	51,673		$	52,594			-1.8	%
Commissions and fees		7,802			6,894			13.2	%
Net investment income		8,669			6,434			34.7	%
Net realized gains on investments		4,185			1,794			133.3	%
Other-than-temporary impairment losses on investments:
Total losses		(947	)		(37	)		2459.5	%
Portion of losses recognized in accumulated other comprehensive income		441			—			N/M
Net impairment losses recognized in earnings		(506	)		(37	)		1267.6	%
Total Operating Revenues		71,823			67,679			6.1	%
Operating Expenses
Losses and loss adjustment expenses, net		34,011			30,493			11.5	%
Amortization of deferred acquisition expenses		13,143			13,329			-1.4	%
Underwriting, agency and other expenses		11,161			9,223			21.0	%
Amortization of intangible assets		516			575			-10.3	%
Restructuring		5,018			—			N/M
Total Operating Expenses		63,849			53,620			19.1	%
Operating Income		7,974			14,059			-43.3	%
Interest Expense		1,386			1,416			-2.1	%
Change in Fair Value of Derivative Instruments		—			(106	)		N/M
Income Before Income Taxes		6,588			12,749			-48.3	%
Income Taxes		1,376			4,068			-66.2	%
Net Income	$	5,212		$	8,681			-40.0	%
Net Income Per Share:
Basic	$	0.30		$	0.49
Diluted	$	0.30		$	0.48
Weighted Average Shares Outstanding:
Basic		17,105,376			17,775,560
Diluted		17,383,667			18,109,331
GAAP Underwriting Ratios:
Loss ratio		65.8	%		58.0	%	7.8		Pts.
Expense ratio		43.2	%		30.4	%	12.8		Pts.
Combined ratio		109.0	%		88.4	%	20.6		Pts.

-MORE-

First Mercury Financial Corporation
Add 5

First Mercury Financial Corporation
Condensed Consolidated Balance Sheets
(Unaudited)

	March 31,			December 31,
	2010			2009
	(Dollars in thousands,
	except share and per share data)
ASSETS
Investments
Debt securities	$	666,975		$	648,522
Equity securities and other		38,707			38,752
Short-term		45,531			12,216
Total Investments		751,213			699,490
Cash and cash equivalents		15,467			14,275
Premiums and reinsurance balances receivable		52,603			78,544
Accrued investment income		6,241			6,248
Accrued profit sharing commissions		14,368			14,661
Reinsurance recoverable on paid and unpaid losses		183,364			172,711
Prepaid reinsurance premiums		57,999			57,374
Deferred acquisition costs		26,172			25,654
Intangible assets, net of accumulated amortization		36,588			37,104
Goodwill		25,483			25,483
Other assets		24,256			26,049
Total Assets	$	1,193,754		$	1,157,593
LIABILITIES AND STOCKHOLDERS’ EQUITY
Loss and loss adjustment expense reserves	$	511,828		$	488,444
Unearned premium reserves		147,922			146,773
Long-term debt		67,013			67,013
Line of credit		30,000			4,000
Funds held under reinsurance treaties		74,148			71,661
Premiums payable to insurance companies		28,426			31,167
Reinsurance payable on paid losses		1,661			958
Deferred federal income taxes		14,194			13,844
Accounts payable, accrued expenses, and other liabilities		28,827			17,649
Total Liabilities		904,019			841,509
Stockholders’ Equity
Common stock, $0.01 par value; authorized 100,000,000 shares; issued and outstanding 17,635,206 and 17,181,106 shares		176			172
Paid-in-capital		156,050			154,417
Accumulated other comprehensive income		18,769			16,256
Retained earnings		116,588			147,087
Treasury stock; 130,600 and 130,600 shares		(1,848	)		(1,848	)
Total Stockholders’ Equity		289,735			316,084
Total Liabilities and Stockholders’ Equity	$	1,193,754		$	1,157,593
Book Value Per Share (1)	$	16.43		$	18.40
Tangible Book Value Per Share (1)	$	13.61		$	15.49

(1) Reflects $2.00 per share special dividend paid on March 31, 2010.

-MORE-

First Mercury Financial Corporation
Add 6

First Mercury Financial Corporation
Summary Financial Data

	Three Months Ended
	March 31,
	2010			2009
	(Dollars in thousands,
	except per share data)
Gross Written Premiums:
Primary general liability	$	49,297		$	50,746
Excess/Umbrella casualty		11,167			8,646
Professional liability		10,248			8,333
Commercial property		6,611			7,570
Other		6,411			2,583
Gross written premiums	$	83,734		$	77,878
Net Written Premiums:
Primary general liability	$	34,425		$	34,338
Excess/Umbrella casualty		1,819			1,008
Professional liability		6,087			6,420
Commercial property		3,841			5,476
Other		6,411			2,583
Net written premiums	$	52,583		$	49,825
Commissions and Fees:
Insurance underwriting commissions and fees	$	1,469		$	1,357
Insurance services commissions and fees		6,333			5,537
Total commissions and fees	$	7,802		$	6,894
Cash and Cash Equivalents:
Net cash provided by operating activities	$	49,121		$	25,697
Net cash used in investing activities		(43,320	)		(42,944	)
Net cash used in financing activities		(4,609	)		—
Net increase (decrease) in cash and cash equivalents	$	1,192		$	(17,247	)
Return on Equity: (1)
Net income		6.9	%		13.0	%
Operating net income		7.9	%		11.1	%
Operating Net Income: (3)
Net income	$	5,212		$	8,681
Adjust for Net realized gains on investments, net of tax		(2,720	)		(1,167	)
Adjust for Other-than-temporary impairment losses on investments, net of tax		329			25
Adjust for Change in fair value of derivative instruments, net of tax		—			(69	)
Adjust for Restructuring, net of tax		3,262			—
Operating net income	$	6,083		$	7,470
Operating Net Income Per Share: (3)
Diluted	$	0.35		$	0.41
	March 31,			December 31,
	2010			2009
Tangible Stockholders’ Equity: (2)
Total stockholders’ equity	$	289,735		$	316,084
Intangible assets, net		(36,588	)		(37,104	)
Deferred tax liability — intangible assets, net		12,432			12,613
Goodwill		(25,483	)		(25,483	)
Tangible stockholders’ equity	$	240,096		$	266,110

(1)	Return on equity represents net income and operating net income expressed on an annualized basis as a percentage of average stockholders’ equity.
(2)	Tangible stockholders’ equity is total stockholders’ equity excluding the value of intangible assets, net of accumulated amortization, goodwill, and the deferred tax liability related to intangible assets.
(3)	See discussion of use of non-GAAP financial measures above

-###-