Business Description

Overview Selective Insurance Group, Inc. ("Parent") is a New Jersey insurance holding company incorporated in 1977. It owns ten property and casualty insurance subsidiaries ("Insurance Subsidiaries") that sell products and services only in the United States ("U.S.") and exclusively through independent insurance agents and wholesale brokers. Nine of our Insurance Subsidiaries are licensed by various state insurance departments as admitted carriers, allowing them to write specific property and casualty lines in the standard market. The tenth subsidiary is authorized as a non-admitted carrier to write property and casualty insurance in the excess and surplus ("E&S") lines market. Throughout this document, we refer to the Parent and the Insurance Subsidiaries collectively as "we," "us," or "our." We use "Parent" when appropriate to distinguish it from the Insurance Subsidiaries. Specific terms related to the property and casualty industry are defined in a glossary attached as Exhibit 99.1 to this Form 10-K. We have a long and successful history in the property and casualty insurance industry dating back to our 1926 founding. We list our common (stock symbol "SIGI") and preferred (stock symbol "SIGIP") stocks on the Nasdaq Global Select Market. In 2025, AM Best Company ("AM Best") ranked us as the 34th largest property and casualty group in its annual "Top 200 U.S. Property/Casualty Writers" list based on 2024 net premiums written ("NPW"). Our current AM Best financial strength rating is "A+" (Superior). Strategic Advantages Our competitive and crowded market requires us to clearly articulate and demonstrate our value proposition to customers, distribution partners, employees, and investors. We believe our five key sustainable competitive advantages are: • A unique operating model that places empowered decision-makers alongside our customers and distribution partners. • A franchise-value distribution model, characterized by close and meaningful business relationships with a select group of high-quality distribution partners. • An ability to develop and integrate sophisticated technology tools that support our front-line employees in making informed risk selection, pricing, and claims decisions. • A commitment to delivering a superior omnichannel customer experience, enhanced by people and technology. • A highly engaged and aligned team of extremely talented employees. Several nationally recognized statistical rating organizations ("NRSROs") evaluate and rate our financial strength, operating performance, strategic position, and ability to meet policyholder obligations. NRSRO Financial Strength Rating Outlook AM Best A+ Stable Standard & Poor’s Global Ratings ("S&P") A Stable Moody’s Investors Services ("Moody’s") A2 Stable Fitch Ratings ("Fitch") A+ Stable We believe our AM Best rating most significantly influences our ability to write insurance business. Our independent distribution partners recommend insurance carriers based partly on financial strength ratings to (i) ensure an insurance carrier's ability to pay claims and provide benefits to customers when needed, directly impacting the level of trust a customer has in an insurance carrier and (ii) limit their potential liability for customer error and omission claims. Similarly, many customers consider ratings when purchasing insurance because their loan, mortgage, and other real and personal property security agreements typically require minimum carrier financial strength rating requirements. 4 Table of Contents These NRSROs also evaluate and rate our long-term debt creditworthiness and capacity to meet obligations when they come due. Credit ratings significantly influence our overall funding profile and ability to access certain types of liquidity. Our current senior debt credit ratings are as follows: NRSRO Credit Rating Long-Term Credit Outlook AM Best a- Stable S&P BBB Stable Moody’s Baa2 Stable Fitch BBB+ Stable Our S&P, Moody's, and Fitch financial strength and credit ratings influence our ability to advantageously access capital markets more than our AM Best rating. Segments We have four