Exhibit 99.1 Harleysville Group Quarterly Results Impacted by Workers Compensation, Winter Storm and Personal Lines Losses; Strong Growth in Commercial Business Continues HARLEYSVILLE, Pa., April 25 /PRNewswire-FirstCall/ -- Harleysville Group Inc. (Nasdaq: HGIC) today reported a diluted operating loss of $0.10 per share for the first quarter, reflecting the impact of its previously announced $20 million pretax workers compensation reserve adjustment and $3.6 million of winter storm property catastrophe losses, as well as poor personal lines results. At the same time, the company reported ongoing strong premium growth in its core commercial business segment during the first quarter of 2003. The diluted net loss per share for the first quarter of 2003 was $0.11, versus diluted net income of $0.44 in the first quarter of 2002. On a per share basis, the company had $0.01 of realized investment losses in the first quarter of 2003, compared to a $0.01 gain in the first quarter of 2002. The $0.10 diluted operating loss per share, which excludes the impact of net realized after-tax investment losses that are included in the net loss, compared to diluted operating earnings of $0.43 for the same period in 2002. "We are disappointed in our results this quarter, but we have taken the quick action necessary to address workers compensation reserve adequacy," commented Walter R. Bateman, Harleysville Group's chairman and chief executive officer. "Our decisive response to the adverse activity we saw late in the quarter underscores our commitment to maintaining reserve adequacy. Overall, our disciplined small commercial strategy continues to deliver double-digit premium growth and our balance sheet remains strong." The company's first quarter earnings were reduced by $20 million pretax, or $0.43 per share after tax, due to the workers compensation reserve adjustment, while the property catastrophe losses resulting from the winter storms of $3.6 million, or $0.08 per share after tax, were capped by the quarterly aggregate reinsurance agreement with Harleysville Mutual Insurance Company. In the first quarter of 2002, Harleysville Group's property catastrophe losses were $0.8 million, or $0.02 per share after tax. Harleysville Group's overall statutory combined ratio* was 115.4 percent in the first quarter of 2003, compared to 103.3 percent in the first quarter of 2002. The workers compensation reserve adjustment added 10.0 points to the combined ratio. The property catastrophe losses added 1.8 points, in contrast to the first quarter of 2002 when property catastrophe losses contributed 0.4 points to the combined ratio. First quarter net written premiums rose 13 percent to $215.3 million in 2003 from $190.7 million in 2002. First quarter pretax investment income was unchanged at $21.4 million in 2003, while after-tax investment income rose 1 percent to $16.5 million. Operating cash flow for the first quarter was $37.5 million, $12.5 million higher than the prior year's first quarter. Commercial lines Triggered by significantly higher-than-expected loss reporting that emerged near the quarter's end, the company strengthened its workers compensation reserves and reviewed its workers compensation claims files. That evaluation identified the need for additional strengthening, and the company announced on April 23 that it had increased its total reserve adjustments for the quarter to $20 million. Reserve adjustments in this line accounted for 70.5 points of the 192.2 percent workers compensation combined ratio, and represented 13.4 points of the 114.1 percent commercial lines combined ratio. The commercial lines combined ratio for the first quarter of 2002 was 103.2 percent. The company reported underwriting profitability in its commercial auto and commercial multi-peril business, which generated combined ratios of 96.0 percent and 98.8 percent, respectively. Commercial lines net written premiums rose 16 percent in the first quarter to $170.5 million - the company's 12th consecutive quarterly double-digit premium increase - primarily reflecting the result of higher pricing. Personal lines Harleysville Group's personal lines combined ratio was 119.3 percent in the first quarter of 2003, versus 103.1 percent during the first quarter of 2002. In addition to property catastrophe losses, large loss activity in personal auto and homeowners further impacted the quarter's results. For the quarter, net written premiums increased by 1 percent to $44.7 million in 2003. Outlook "We are not wavering from the execution of our strategy," Bateman stated. "We have a high-quality small commercial risk portfolio - which accounts for more than three-quarters of our business - and a solid balance sheet. With those as our foundation, we believe we can achieve operating earnings per share in the $1.45 to $1.55 range for the year." Webcast The company will host a live Webcast today, Friday, April 25, 2003, at 9:00 a.m. (ET) to discuss its first quarter results. The Webcast will be available from the financial section of the company's Web site (www.harleysvillegroup.com). An archive of the presentation will be available until May 9, 2003, on the company's Web site. Corporate profile Harleysville Insurance, "Good people to know," is the premier provider of insurance products and services for small businesses and individuals, and ranks among the top 50 U.S. property/casualty insurance groups based on net written premiums. Harleysville Group Inc. (Nasdaq: HGIC) is a publicly traded holding company for nine regional property/casualty insurance companies collectively rated A (Excellent) by A.M. Best Company. Harleysville Insurance, which distributes its products through independent insurance agents, operates in 32 Eastern and Midwestern states. Further information can be found on the company's Web site. * "Statutory combined ratio" is a measure of underwriting profitability and is based on numbers determined under statutory accounting practices. It is the sum of the ratio of losses to premiums earned plus the ratio of underwriting expenses to premiums written. A ratio of less than 100 percent indicates underwriting profitability. Certain of the statements contained herein (other than statements of historical facts) are forward-looking statements. Such forward-looking statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 and include estimates and assumptions related to economic, competitive and legislative developments. These forward- looking statements are subject to change and uncertainty that are, in many instances, beyond the company's control and have been made based upon management's expectations and beliefs concerning future developments and their potential effect on Harleysville Group Inc. There can be no assurance that future developments will be in accordance with management's expectations so that the effect of future developments on Harleysville Group will be those anticipated by management. Actual financial results including premium growth and underwriting results could differ materially from those anticipated by Harleysville Group depending on the outcome of certain factors, which may include changes in property and casualty loss trends and reserves; catastrophe losses; the insurance product pricing environment; changes in applicable law; government regulation and changes therein that may impede the ability to charge adequate rates; changes in accounting principles; performance of the financial markets; fluctuations in interest rates; availability and price of reinsurance; and the status of the labor markets in which the company operates. Harleysville Group Inc. and Subsidiaries FINANCIAL HIGHLIGHTS Quarter ended March 31 (in thousands, except per share data) 2003 2002 OPERATING RESULTS Diluted earnings per common share: Operating income (loss) ($0.10) $0.43 Realized gains (losses), net of tax (0.01) 0.01 Net income (loss) ($0.11) $0.44 Cash dividend per common share $0.165 $0.15 FINANCIAL CONDITION March 31, 2003 December 31, 2002 Assets $2,367,238 $2,311,524 Shareholders' equity $623,524 $632,112 Per common share $20.69 $21.13 CONSOLIDATED STATEMENTS OF INCOME (LOSS) Quarter ended March 31 (in thousands, except per share data) 2003 2002 REVENUES: Premiums earned $198,829 $182,505 Investment income, net of investment expense 21,447 21,482 Realized investment gains (losses) (433) 478 Other income 4,520 3,745 Total revenues 224,363 208,210 LOSSES AND EXPENSES: Losses and loss settlement expenses 163,759 127,272 Amortization of deferred policy acquisition costs 48,317 44,622 Other underwriting expenses 18,557 16,922 Interest expense 1,394 1,421 Other expenses 1,211 1,050 Total expenses 233,238 191,287 Income (loss) before income taxes (8,875) 16,923 Income taxes (benefit) (5,635) 3,583 Net income (loss) ($3,240) $13,340 Weighted average number of shares outstanding: Basic 29,987,316 29,510,116 Diluted 29,987,316 30,062,578 Per common share: Basic earnings (loss) ($0.11) $0.45 Diluted earnings (loss) ($0.11) $0.44 These financial figures are unaudited. Harleysville Group Inc. and Subsidiaries CONSOLIDATED BALANCE SHEETS (in thousands, except share data) March 31, 2003* December 31, 2002 ASSETS Investments: Fixed maturities: Held to maturity, at amortized cost (fair value $383,827 $352,732 $385,162 and $416,942) Available for sale, at fair value (amortized cost $1,122,764 1,191,933 1,124,869 and $1,051,880) Equity securities, at fair value (cost $93,633 and $96,849) 102,119 107,177 Short-term investments, at cost, which approximates fair value 101,441 89,692 Total investments 1,748,225 1,706,900 Cash 2,491 2,944 Premiums in course of collection 140,306 138,905 Reinsurance receivable 88,237 75,488 Accrued investment income 20,505 21,552 Deferred policy acquisition costs 99,255 94,896 Prepaid reinsurance premiums 20,037 19,421 Property and equipment, net 26,363 27,556 Deferred income taxes 31,821 25,784 Securities lending collateral 137,702 139,215 Due from affiliate 10,709 Other assets 52,296 48,154 Total assets $2,367,238 $2,311,524 LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities: Unpaid losses and loss settlement expenses $977,761 $928,335 Unearned premiums 423,347 406,277 Accounts payable and accrued expenses 106,867 109,965 Securities lending obligation 137,702 139,215 Debt 95,620 95,620 Due to affiliate 2,417 Total liabilities 1,743,714 1,679,412 Shareholders' equity: Preferred stock, $1 par value; authorized 1,000,000 shares; none issued Common stock, $1 par value, authorized 80,000,000 shares; issued 31,157,811 and 30,917,575 shares; outstanding 30,139,312 and 29,917,575 shares 31,158 30,918 Additional paid-in capital 154,938 149,091 Accumulated other comprehensive income 45,406 49,086 Retained earnings 410,370 418,582 Deferred compensation (2,356) Treasury stock, at cost, 1,018,499 shares (15,992) (15,565) Total shareholders' equity 623,524 632,112 Total liabilities and shareholders' equity $2,367,238 $2,311,524 * These financial figures are unaudited. Harleysville Group Inc. and Subsidiaries SUPPLEMENTARY FINANCIAL ANALYSTS' DATA Quarter ended March 31 (dollars in thousands) 2003 2002 Net premiums written $215,283 $190,655 Statutory surplus $493,404 $543,014 Pretax investment income $21,447 $21,482 Related federal income taxes 4,973 5,177 After-tax investment income $16,474 $16,305 SEGMENT INFORMATION Quarter ended March 31 (dollars in thousands) 2003 2002 Revenues: Premiums earned: Commercial lines $148,749 $128,305 Personal lines 50,080 54,200 Total premiums earned 198,829 182,505 Net investment income 21,447 21,482 Realized investment gains (losses) (433) 478 Other 4,520 3,745 Total revenues $224,363 $208,210 Income before income taxes: Underwriting gain (loss): Commercial lines ($28,006) ($10,164) Personal lines (7,894) 1,424 SAP underwriting loss (35,900) (8,740) GAAP adjustments 4,096 2,428 GAAP underwriting loss (31,804) (6,312) Net investment income 21,447 21,482 Realized investment gains (losses) (433) 478 Other 1,915 1,275 Income (loss) before income taxes ($8,875) $16,923 Income taxes on net investment income $4,973 $5,177 Income tax on remaining loss (10,608) (1,594) Total income taxes (benefit) ($5,635) $3,583 Effective tax rate on: Net investment income 23.2% 24.1% Net income 63.5% 21.2% These financial figures are unaudited. Harleysville Group Inc. and Subsidiaries STATUTORY DATA BY LINE OF BUSINESS Quarter ended March 31 (dollars in thousands) 2003 2002 Net premiums written: Commercial: Automobile $55,243 $47,076 Workers' compensation 32,773 31,943 Commercial multi-peril 64,812 54,310 Other commercial 17,709 13,129 Total commercial $170,537 $146,458 Personal: Automobile $29,597 $28,970 Homeowners 13,472 13,395 Other personal 1,677 1,832 Total personal $44,746 $44,197 Total personal and commercial $215,283 $190,655 Combined ratios: Commercial: Automobile 96.0% 97.5% Workers' compensation 192.2% 122.0% Commercial multi-peril 98.8% 100.1% Other commercial 83.8% 89.8% Total commercial 114.1% 103.2% Personal: Automobile 117.5% 113.5% Homeowners 124.0% 89.3% Other personal 114.8% 59.7% Total personal 119.3% 103.1% Total personal and commercial 115.4% 103.3% Losses paid $128,637 $116,447 Net catastrophe losses incurred $3,649 $807 These financial figures are unaudited. SOURCE Harleysville Group Inc. -0- 04/25/2003 /CONTACT: Carol Manning (Investors), +1-215-256-5020 or cmanning@harleysvillegroup.com; or Randy Buckwalter (Media), +1-215-256-5288 or rbuckwalter@harleysvillegroup.com, both of Harleysville Group/ /Web site: http://www.harleysvillegroup.com / (HGIC)